TECH N I - World Radio History

ELECTRONICTECH N I

The "Inside Story" of Power Wire Wound Resistors

ResistegCoated Resistor

VitreousEnamel Resistor

IIe°0gSA\\,,_-.......

o,,,figOw

A'cS\S

Was\s'°AAS

-\-0

ma se

U ZV ' f

II1`.1

1

..°'\lA's°\s

F-\\v".

...

...........

A R16\s'ccp\V\k

ftrty, .

......

. 1

...0

iI

I

/4. .

OHMS 0 10K 20K 30K 40K 50K 60K 70K 80K 90K

100WATTS

75WATTS

50WATTS

25WATTS

0

WATTS100K

WHY PLAY GUESSING GAMESWITH RATINGS?

IRC Power Resistors with Resisteg Coating require no deratingThe Resisteg Coating of IRC Power Wire Wound Resistors curesat only 205°F, compared with 1200°F or more for vitreousenamel coatings. At this low curing temperature windings donot shift so that heavier wire can be used than is possible withvitreous enamel resistors. Heavier wire transfers the heat to theterminals faster, eliminates the necessity for derating at highambient temperatures. What brings satisfaction to your cus-tomers brings business to you-IRC Resisteg Coated PowerWire Wound Resistors.ORDER TODAY FROM YOUR IRC DISTRIBUTOR!

INTERNATIONAL RESISTANCE COMPANY Dept. 578, 401 N. Broad Street, Philadelphia 8, Pa.

TELEVISION

ELECTRONICCHNICI

ELECTRONIC RADIO INDUSTRIAL

Incluchnq

Circuit Digests

ALBERT J. FORMAN Editor

ROBERT CORNELL Technical Editor

B. V. SPINETTA Assistant Editor

C. F. DREYER Consultant Art Director

PAT DRUMM Editorial Assistant

Address all mail to480 Lexington Ave., New York 17, N. Y.

Telephone YUkon 6-4242

HOWARD A. REED Publisher

BUSINESS DEPARTMENT

Wm. B. ZURKAN Regional Manager

N. McALLISTER Production Manager

I. HUTCHINS Accounting Supervisor

M. RUBIN Circulation Manager

P. H. DEMPERS Regional Manager

5010 Howard St., Skokie, Ill.Telephone ORchard 5-1355

CHRIS DUNKLE & ASSOCIATESCalifornia Representative

740 S. Western Ave., Los Angeles 5, Calif.Telephone DUnkirk 7-6149

420 Market St., San Francisco 11, Calif.Telephone SUtter 1-8854

BERNIE EDSTROM Regional Manager

2169 Eldred Ave., Cleveland 7, OhioTelephone LAkewood 1-7900

co

"ABC):c. 0°

ELECTRONIC TECHNICIAN & Circuit Di-gests, September, 1958. Vol. 68, No. 3. $.50a copy. Published monthly by ElectronicTechnician, Inc. Publication office, EmmettSt., Bristol, Conn. Editorial, advertisingand executive offices, 480 Lexington Ave-nue, New York 17. Telephone YUkon 6-4242.

Entered as second class matter at the PostOffice at Bristol, Conn., June 10, 1954.

Subscription rates: United States and Can-ada, $4.00 for one year; $6.00 for twoyears; $8.00 for three years. Pan-Americanand foreign countries: $7.00 for one year;$10.00 for two years; $14.00 for threeyears. Copyright 1958 by Electronic Tech-nician, Inc., New York. M. Clements, BoardChairman; H. Reed, President; A. Forman,Executive Vice -President. Title registered inU. S. Patent Office. Reproduction or re-

printing prohibited except by writtenauthorization of publisher. Printed in

U.S.A. by Hildreth Press.

ELECTRONIC TECHNICIAN September,

September, 1958

FRONT COVcERStereo 1959 is an invitation to a new horizon of audio and electronic activity

ich is boun to encourage a demand for conversions, new equipment, and installations. It is apractical guide to understanding stereo. See 'Stereo-New Opportunity for Technicians'. on page27. Full index of contents of Stereo 1959 section on page 43.

FEATURES and ARTICLESRaise Standards for TV Receiving Tubes 11

Stereo-New Opportunity for Technicians (Editorial) 27

"Tuning in the Picture" 28Atomic Radiation and Television X -Rays Albert J. Forman 30

Servicing 110° Vertical Sweep Circuits Jesse Dines 32

"Tough Dog" Corner Ivan White 33

Integrated Test Equipment Spreads TV Alignment .... Victor Robinson 34

Building a Technical Library 36

Shops Hints R E. Davis, Paul Katz 38

Free Literature 39

Maintaining 2 -Way Mobile Radio 114

Standards for Stereophonic Disc Records Record Industry Ass'n. 122

New Products 123

STEREO 195941-100

DEPARTMENTSEditor's Memo 6 Reps. & Distrs. 23

Letters to the Editor 14 Catalogs & Bulletins 25

New Books 21 Calendar of Coming Events 29

News of the Industry 22 Audio Newsletter 110

Association News 119

CIRCUIT DIGESTS

958

133

ALIGNMENT "'garL Tin Neer chum..2. Came. sweep genera ili ,,,, .12111 . .

ittr.21..a .... ain i-.. . 7 ag . .

.. klOr -1.1. etas tc 29,Z, , ....., ,,,, .a. Comm. 2 &ector am t 41114 .2. ,..,' QS' Xi- 4. SA

::::::=7! gf:e, itT. Come. owille.roit, , t XSS. Ad)* renta..1 tan '', ...-..,, pat ..

accomplish U. It 12I . t MT a,,' ".,

PARTS LEST I; tlp_ei GI .2gEl Ea-i.....,risrii,- '- 1 - :-44 CESPiii

IN THIS ISSUE(16 pp. latest schematics-see last page)

ADMIRAL: TV Chassis 20B6C, T;2OUB6C, T

GENERAL ELECTRIC (Canada): TransistorRadio P750A

MONTGOMERY WARD: Hi Fi AM -FMRadio Phono Serial No. 75X

MOTOROLA: TV Chassis PTS546, YPACKARD-BELL: TV Chassis 98D4RCA: TV Chassis KCS122A, B, C, D, E, F,

H, J, K, L, M, N, P, R, AD, AE

peiCLZVI

PHILCO offers youa program of

COMPLETENESS !Here is a program of completeness designedto increase your volume and profit. In productsand services, Philco and Philco Distributors are

doing everything possible to help you inthe successful and profitable operation of yourbusiness. See your Philco Distributor today!

Universal

Service Parts

Your Philco Distributorhas available for you acomplete new line of elec-tronic universal parts thatnot only fit all Philcoreceivers but many com-petitive make and model aswell. All Philco Universalparts are precision engi-neered and quality tested toinsure superior operationand longer life.

Complete Parts Catalogs

Over 60,000 items are cataloged in 3 sepa-rate books . . . one for each product line,electronics, appliances and laundry equip-ment. Here is complete information, up-to-date and put together in a way that'sdesigned to save you time and effort.

pH IL CCt

it0710120fpfS

Universal

Full Fidelity Needles

Now, one complete line ofprecision engineered andcustom designed needles tofit every make and modelphonograph and HighFidelity receiver. Also avail-able . . . the most accurate,up-to-date, cross-referencecatalog in the industry.Ask your Philco distribu-tor how you can get thebeautiful needle counterdispenser free !

SEE YOUR PHILCO DISTRIBUTOR TODAY!2 ELECTRONIC TECHNICIAN September, 1958

Don't Gamble with your Reputation!FOR DEPENDABILITY, FOR QUALITY INSIST ON

GENUINE PHILCO-scLA/,* WASHER PARTS

Your Philco Distributor maintains a com-plete stock of parts and accessoriesdesigned especially for Philco-Bendix

washer products. As a qualified Service-man you may obtain these genuine parts atany time from your local Philco Distributor.

Now, Factory-Remanufactured

PHILCO8-e-o%ci.t",c

Washer Micro -Transmissions

The only genuine Micro -Transmissions factoryremanufactured to the latest and most exactingquality engineering specifications. Six months' war-ranty from the date of installation.

PH I LCO PH ILCO-BENDIX CROSLEYWasher and Dryer Parts

Your Philco Distributor carries a complete stock ofthese various parts to enable you to offer quick andefficient service in this big, profitable business.

INSIST ON GENUINE PHILCO APPLIANCE PARTS

Don't gamble with cheap imitations. Seeyour Philco Distributor for a complete lineof quality -built, quality -tested applianceparts. He has everything you might needfrom a door hinge to a liner, from a gasketto a compressor. Don't settle for less.

See Your Philco Distributor Today!

P

01-6g6076

World -Wide DistributionService Parts Power -Packed Batteries Universal Com-

ponents Long -Life Tubes Heavy -Duty Rotors StarBright 20/20 Picture Tubes Long Distance Antennas

Appliance Parts Laundry Parts Universal Partsand Accessories

ELECTRONIC TECHNICIAN September, 1958 3

JouvttfiR

P CiF ITJFD is cracking the untapped replacement marketwide open with the most massive sales promotiondrive in TV antenna history!

NEW MARKETS! NEW PROMOTIONS!NEW CUSTOMERS:Al*NATIONAL ADVER1TSIIM!More than 15,000,000 prospective antennabuyers will see big hard-hitting ads like thesein mass -media such

Progressive FarmerIN '58 AND '59

FANTABULOUS INCENTIVES!

DRAMATIC SALES HELPS!

shrink* the miles...flattensthe mountalnal

shrinks the miles...flattens the mountains!

Luxurious vinyl card table and chair sets, beautiful hand -paintedportraits of your loved ones, aluminum chaise lounge and foldingchair suites. FREE ... to JFD Satellite -Helix Colortennaservice -dealers. No coupon collecting, no waiting for pre-miums. Pick your gift up, right then and there, when youorder from your J F D distributor.

Door knob hangers, TV and radio commercials, banners, displays,antenna check-up booklets, envelope enclosures, newspaper mats-each advertising your store as headquarters for TV antenna

lace ents. _

CO-OP PROMOTION FUNDS!

The biggest advertising allowances everfor your use in promoting TV antenna replacementsin your local trading area.

TIE IN WITH THE GOLDEN HARVEST OF PROFITS-

TODAY'S BOLD NEW CONCEPT IN ANTENNA MERCHANDISING

Start your own Operation Upturn. See your JFD distributor today andreap a Harvest of Profits starting now.

FOR AHARVEST

OF TVENJOYMENTINSIST ON

TV ANTENNASSY JFD

Masa h eketrotties sit.. I9:9

4 ELECTRONIC TECHNICIAN September, 1958

sell the t40103-raltdko.'

SATELLITE -HELIXthe TV antenna that shrinks the miles...

flattens the mountains!

FLASH ...ALL HELIX COLORTENNAS NOW FEATURE ADVANCED SLEEVE DIPOLE DESIGN:

No other fringe TV antenna has evercaptured the imagination of service -dealers like the exciting Satellite -Helix.Proof is the fact that more Satellite -Helixes have been sold in the last 6months than any other deep fringe TVantenna!

Profit -squeezed servicemen, installersand dealers know that here at last isthe antenna that gives their customersthe reasons to buy now-performanceand construction features with the dra-matic difference they can show and sell!

* 28 WORKING ELEMENTS THAT CONQUER DISTANCE!* ALL -NEW BALANCED SLEEVE DIPOLE DESIGN!* ROCK -OF -GIBRALTAR RUGGEDNESS!* HONEST ANTENNA VALUE AT A REALISTIC PRICE!* A HARVEST OF PROFITS FOR YOU!* A HARVEST OF TV ENJOYMENT FOR YOUR CUSTOMERS!

Plus OTHER POPULAR -SELLING HELIX COLORTENNAS NOW WITHNEW SATELLITE SLEEVE DIPOLE DESIGN (REGULAR OR GOLD ANODIZED)

TO GUARANTEE LEADERSHIP IN EVERY MARKET! POWER -HELIX STAR -

HELIX SUPER -HELIX JUNIOR -HELIX

It all adds up to the most dynamic product and promotionpackage ever put to work in the TV antenna industry-yourHARVEST OF PROFITS in '58 and '59.

SEE YOUR JFD DISTRIBUTOR NOW! GET YOUR FAIR SHARE OFTODAY'S 40 MILLION DOLLAR ANTENNA REPLACEMENT MARKET!

JFD Canada Ltd.51 McCormack StreetToronto, Ontario, Canada

JFD International15 Moore StreetNew York, New York

Pioneers in electronics since 1929

JFD ELECTRONICS CORPORATIONBROOKLYN 4. NEW YORK


MODEL 97AEROVOX

LC -CHECKER

INDUCTANCE LOOP AND C PROBE ASSEMBLEDC PROBE ASSEMBLY

CLIP CORD

THE MODEL 97 LC -CHECKER CAN DO ALL THESE JOBS!

U

Measure capacitance and relative"Q" of capacitors in circuit.Measure capacitor and insulationresistance.

Align r -f and i-f circuits.

Check super -het oscillator trackingwith set "hot -or -cold."Align i-f channels in FM receiversand independent alignment of i-ftransformers.Determine resonant absorptionpoints.

Locate resonant points in unusedportions of coil assemblies in multi -range oscillators.Align video and sound i-f systemsin TV sets.Precise alignment of 4.5 me inter -carrier sound i-f channels.

Write for name of nearest Distributor.

10

a

Determine natural resonant pointsof r -f chokes.

Determine natural period of anten-nas and transmission lines.

Measure fundamental crystal fre-quencies and operation at harmoniclevels.

Measure transmitter buffer, ampli-fier and tank circuits for parasiticcurrent loops with power off.

Measure correct wave -trap and fil-ter tuning.

With a standard plug-in crystal, canbe used as an accurate signal gen-erator for signal substitution andprecise signal sources.

$69.95

AEROVOX CORPORATIONDISTRIBUTOR DIVISIONNEW BEDFORD, MASS.

Editor'sMemo

There are always some suckers whowill fall for a something -for -nothingcome-on. Every business has a fewoverly sharp operators who use thisapproach.

In the stock market there are so-called "boiler rooms" where fast talk-ing salesmen use the telephone toseparate the get -rich -quick investorfrom his money with worthless stock.

ID the electronic servicing business,there are some people who offer $1 re-pair jobs and free tube testing in thehome as come-ons. Some consumersfall for this-perhaps including thosewith a touch of larceny in their heartsand a something -for -nothing attitudein their minds.

But folks are not as gullible as wemight think. I recently read about atest which should help restore ourfaith that you can't fool all the peopleall the time.

A major book publisher sent out abook club offering in three differentversions. 50,000 letters asked the re-cipients to accept the first selectionfree. Another 50,000 asked for thefirst selection. Still another 50,000 peo-ple received letters asking for 25('.

Which offer pulled best?Well, the 25C offer attracted 40%

more takers than the free offer. The100 offer pulled 60% better than thefree offer.

Now this is not conclusive for allbusinesses, but it does indicate thatplenty of folks are suspicious of some-thing -for -nothing offers.

A few words about this month'sStereo issue. Our staff really worked toproduce it, and we're proud to say thatit scored several "firsts," including:

First comprehensive article -directory -catalog roundup on stereo ever pub-lished.

Largest issue-in pages and copies-ever published by any magazine in ourfield in all the years of ELECTRONICTECHNICIAN'S existence.

We've put a great deal of effort intostereo because it will be an importantfactor in your future servicing opera-tions.

Incidentally, we'll be exhibiting atthe New York High Fidelity MusicShow, Sept. 30 -Oct. 4, at the N. Y.Trade Show Bldg. If you attend, stopby and see us at Room 420.

We'll be glad to discuss any questionsyou have on getting into the stereobusiness.

cLe6 ELECTRONIC TECHNICIAN September, 1958

IT'S FASTfkiso IT'S EASY

IT'S SAFE

FOR PRINTED CIRCUIT REPAIR

-SOLDERING KIT

New Cup ShapedDe -Soldering Tipletsremove all solder fromcircular multilug corn.ponents in one operation.

Bar Type DeSolderingTiplet removes solderfrom all straight linecomponent junctions atone time.

Morris Weisenberg, Chief TechnicianUniversal Tv Co., Los Angeles, Says..

"We Saved 70% of Time and Temper

In De -Soldering Printed Circuits ..."

'As one of the largest service organizations, with a fleet of 28rucks, saving time for our 45 personnel is important. In the

past, we found that regular soldering irons and tips, when usedfor de -soldering, would break off lugs or ruin the printed board.

Ungar's De -Soldering Kits permit the easy, quick removalof multi -lug components without disturbing printed wirecontinuity. Any part is speedily removed without damage!'

Mfd. by Ungar Electric Tools, Inc., 4101 Redwood Ave., Los Angeles 66

i.)65 UNOAR ELECTRIC TOOLS INC,

Slotted DeSolderingTiplet straightens benttabs and removes solderin one easy motion.

Slotted DeSoldering-iplet flows solder neatlyto replace, repair andrebuild circuit lines.

SAVE OVER 1.0#776W Sandie $1.25Super Hi.Heat Unit 3.00#857 SlAted Tiplet .60

3 Circular Tiplets o 75 ea 2.25

Rectangular Tiplet .75

Metal Case (506 value) .10

Regular ListList

INTRODUCTORY

SALESLIST PRICE

Order From Your Jobber Now!-141M111r-

PATENT PCNOIN


SPEED REPAIRWORKFIELD-TESTED TY SERVICE

Time saved is money saved when repairing television sets. Because of this, GeneralElectric has developed a whole series of original tools and devices to cut your servicingtime and costs. They've been exhaustively field-tested, field -proved. They add profithours to the work week of the television technician.

Read about these ingenious aids below! See them on your next visit to your G -Etube distributor's! Only General Electric makes available this group of special servicedevices-each and every one a time and trouble saver. They're easy to use . . . andeasy to obtain. Ask your G -E distributor how to get them! Distributor Sales, ElectronicComponents Division, General Electric Company, Owensboro, Kentucky.

TWIN -X WRENCH SET (ETR-752)-designed and built expressly forTV -radio repairwork. Replaceseight hex -head socket wrencheshff to IAN. Sizes are clearly markedfor quick selection. Hollow shaftspermit wrench to grip the nut overprotruding end of bolt. Chrome -

plated case-hardened steel-willstand up in long, hard service.

Rae.

SAFETY -GLASS PULLER (ETR-1592).Now you can remove the tele-vision safety glass easily, withoutrisk of cracking or chipping. Han-dle of this device controls a three-inch rubber suction cup withvacuum -release tip.

New G -E Chassis -Jack (ETR-1470)

Picture -Tube Nek-Rest (ETR-1169)

Picture -Tube Pillow (ETR-1469)

NEW TUBE -FUSE -LAMP CHECKER (ETR-981A). Only 3M" by 2 j.i" by 1 7/8".

Can easily be carried in pocket.Powered by 3 "C" flashlight bat-teries. Will check 7- and 9 -pinminiature tubes, also lock -in andoctal -base types . . . picture -tubeheaters . . . all TV and radiofuses . . . all filament -type pilotlamps. A "must" for technicians.

All -Type Tube Puller (ETR-1094)

Service Drop Cloth (ETR-1021)

Adjustable Bench Mirror (ETR-1275)

WITH PEAIDS!

SEE THEMON THIS PEG -BOARDCOUNTER DISPLAY!

Your G -E tube distributor features thislarge peg -board display of TV -serviceaids. Inspect them in detail! All aresafety -packaged in heavy transparentplastic, which keeps them clean, pro-tects them from scratches or otherinjury. Be sure to look for this display atyour distributor's-be sure to study theuseful service aids. You'll want them all!

7 -pin

tubes

l

tubes

, -

9 -pin

PIN -LOCATOR FOR MINIATURE TUBES(ETR-1540). Use it to place minia-tures in hard -to -reach sockets.Centering plug positions the lo-cator above pin holes. Magnetsthen hold locator while tube isturned till pins drop into socket.

MAGNETIC SWING -BEAM SERVICELIGHT (ETR-1593). Magnet holdsthe light securely to chassis of set,so that both your hands are freefor work. Swing -beam designputs illumination just where youneed it. A time -saving aid you'llwant on every job. Small, fitseasily in your service case. Stronglymade, durable . . . uses standardflashlight bulb and batteries.

TR1-PLEX EXTENSION LEAD (ETR-

1527). New in design. Compactfor your service case, with onlyone lead plus adapter. Practicaland easy to use. Like other G -Eservice aids, the Tri-Plex Exten-sion Lead comes in a protective,reusable polyethylene container.

Progress- Is Our Most important Product

GENERAL

GENERA( ILICTNIC

Sur

ELECTRIC

up goes anotherCHANNEL MASTER° '2f67

On morefringe area

roof topsthan any other

TV antenna

Best Performance - highest gain andfront -to -back ratios of any VHF antennas

Strongest Construction - ruggedizedin every detail for more years of trouble.free performance

---,i -Greatest Consumer Preference-created by consistent major-league na- I-- - C.tional advertising ... widest array of at- ,....j.-1- -----tractive point -of -purchase material and r- --.---. ---f^sales producing mats ... and eye -appeal-ing packaging. -4,....

Now, more than ever,

CHANNEL10 ELECTRONIC TECHNICIAN September, 1958

Raise Si-andards For

TV Receiinng Tubes Improvements will extend to TV some of the high re-liability features originally developed for military tubes.

General Electric reports these advances:1. "Snow--,7hite" manufacturing procedures-to mini-

mize lint and dust-have been extended to all receivingtube manufactuiinl at a cost of over $1 million.

2. Adoption of an accelerated heater cycling test tomake sure tubes will perform properly under wide varia-tions in household line voltage. Recent surveys indicatea national average of 122 volts (compared to the nominal117 -volt standard) which necessitates this new designrequirement.

3. Attaining greater uniformity by across-the-boarduse of a new method of testing for shorts or opens withina finished tube by using de instead of ac.

Magnified views of tube heaterwire show new and old ceramiccoating. Inter -element shorts,and "hot spots," are avoided.

Tapered Pins on octal -base re-

ceiving tubes save time andavoid socket damage when in-serting in hard -to -reach spots.

4. Building receiving tubes to meet life tests twice asrigid as the Joint Army -Navy specifications.

5. A new method of controlling the insulation coatingon heater wire to prevent "hot spots" that tend to causetube failure, and to allow closer control of warm-up time.

6. Tapering the ends of pins on octal tube bases to savetime in inserting and removing tubes, and to preventsocket damage.

7. Extending stiff military -type glass strain specifica-tion test to tubes; for example, tough pin -seal strengthtests and a thermo-shock test involving immersing tubesalternately in boiling water and ice -water.

8. Development of new materials for use in tubes.9. Use of a new hard -to -remove branding ink to pre-

vent removing the warranty date code either by accidentor by deliberate erasure by tube counterfeiters.

Many other improvements are being made on individualtube types.

Model No. 63066 transistors,I thermistor, I diode334" long. 3" high,/3/4" deep

004144-ttitifitimoontionitmulit(00loitaifitultuttatIOIWinifilsji"

101!(i

1!Alitlii3ittillift#41101111111_hh

#111.1101411114111111111t0411111111.111111i1111 11ft

0..OftNF11#iNflpltlitllIlllllllINllllhtllIIIIIll (I{11

New!CHANNEL MASTER®Transistor Radios

a

iQ l3 lb

Behind every one of these tiny electronic mar-vels stands Channel Master's outstandingreputation for quality and dependability.These radios make sweet music *or profit -minded dealers.

DESIGNED for powerful, satisfying performance.

BUILT for rugged use, in unbreakable "Imoac" case.

STYLED to sell on sight.

PRICED to give the consumer today's greatestvalue in radios.

Special 4" Dual Range Extension Speaker Available.

Extra: Free Replacement Warranty. See yourChannel Master distributor for full details.

Modal No. 65016 transistors, I diode.11/4" long, 23/4" high, I1/2" deep

the big news is coming from

MASTERELECTRONIC TECHNICIAN September, 1953

131

Tk Mod Advaitad TV ANTENNASiit ifie Meld !

ZEPHYR AND COLOR SERIES ANTENNAS

p

Look for these4 Great Features

1 in 1959L

gri Diook\\.

Today's most powerful dipole! Containsthree active elements on the highs-forward Vee to the low band section-plus integrated director.

no -striplead-in connector

Requires no stripping, no soldering, orwire holders-holds the complete insu-lated wire.

L

W ArdorToday's most powerful director! A com-posite director designed to obtain re-sults from the powerful Wing Dipole.

dynci-coilphasing

Increased performance from uniformtransmission of signal strength of eachactive dipole in a multi -dipole system-AND MAKES POSSIBLE COMPLETE FAC-TORY ASSEMBLY.

TRIO'S COMPLETE LINECOLOR ROYAL-The ultimate in color television reception-or black and white.ZEPHYR ROYAL-Extraordinary power and sensitivity.ZEPHYR PIONEER-For extreme distance.COLORITE-For color and black and white in areas formerly using conicals.

Sharpshooters, Conicals and Yagis

Patents: U.S. 2772413-Canada 541670 Copyright 1958, Trio Mfg. Co.

N70g 7/1440eletatetig9 e00044e# GRIGGSVILLE, ILL.


Take the back off the General Electric "Designer" TV set and youcan do 85%-90% of service jobs without pulling the chassisYou cut your time -per -repair by upto 40% . . . make more calls-andmoney-in the same amount of time!Take off the back and there you are-in easy reach ofup to 90%o of service jobs. Look at the chart!

Look inside! Both sides of the reliable printed circuitboards are easy to reach for service.

No series string filaments-no extension cablesneeded . . . the new "Designers" are certainly theeasiest -to -service sets in all television. You'll wishevery set was a General Electric "Designer."

730gress /s Our Mast /mporr4nt Piave

GENERAL ELECTRIC

TEN TYPICAL JOBS THAT CAN BE DONEWITHOUT REMOVING THE CHASSIS

JOBG -E

"Designer"Set

ASetB

SetC

Replace most resistors yes no no no

Replace most capacitors yes no no no

Replace deflection yoke yes no no no

Replace video detector yes yes no no

Replace audio detector yes no no yes

Replace honzontall phase detector yes no yes yes

Replace power rectifier yes no no yes

Adjust tuner oscillator yes no yes yes

Replace inter -stage transformers yes no no no

Replace size and linearity controls yes no yes yes

General Electric Co., Television Receiver Dept., Syracuse, N.Y.


Never over or underheats!,

Gives

more reliable

soldering!

with duili-M 040#4170limpet/lure Control

A revolutionary new soldering tool from Weller-long-time leader in thesoldering field. Automatically maintains correct soldering temperature-andit's all self-contained. Sensing device is in the tip. Unmatched for reliable TV,radio, printed circuit and other precision soldering. 3 models available for allyour service requirements from controlled lower temperature to heavy elec-trical soldering. Priced from $8.00 list, up.

SOLDERING IRON PERFORMANCE - Temperature vs Load

700°F.

EfficientSoldering

TemperatureRange

600°F.

leeI I

Weller MognastatSoldering Iron

Typical Uncontrolled

Soldering Irons

0 1 3 4 5 6

Load

Approximately 1/2 weightof uncontrolled iron.

Delicate balance-cool handle.

Cord plugs into handle.

Saves current when idling-tips last longer.

Reaches full heat quickly.

Order From Your Distributor or Write for Bulletin

WE ER ELECTRIC CORPi7;

601 STONE'S CROSS ' 91.0EASTON, PA. -,

LETTERSTo the Editor

Stereo ReprintsEditor, ELECTRONIC TECHNICIAN:

"Stereo 1959" looks like it might be aterrific edition. I would appreciate aboutfive extra copies, and also the cost ofreprints in lots of 100, 250 and 500.

CECIL E. HEARDHeard's Radio ServiceAustin, Texas

We hope you find "Stereo 1959"(pages 41-100 in this issue) interesting.More important, we hope you will dis-tribute or sell the reprints to promoteyour hi-fi stereo work among your cus-tomers. Reprints of this 60 -page section,nationally advertised at 500 each, areavailable to the trade at the followingprices:

Single copies 200 ea.10 to 49 copies 120 ea.50 to 99 copies 110 ea.100 to 499 copies 100 ea.500 to 999 copies 90 ea.1,000 and over 80 ea.

-Ed.

Radiation HazardsEditor, ELECTRONIC TECHNICIAN:

We know that prolonged exposure tocertain rays can be detrimental to ourhealth. We understand that a TV setthrows out a certain amount of X-rays.What is involved with color TV? Whatis the best protection? How will it affectus? I don't know if I have raised a ques-tion you can't answer yet, but informa-tion on this score would benefit all elec-tronic technicians.

Elmont, N.Y.

After studying thethan two years, wequestions. See "WhatShould Know About& TV X -Rays," pages

MICHAEL LIZAK

problem for morecan answer yourEvery TechnicianAtomic Radiation30-31 in this issue.

-Ed.

Honest DateEditor, ELECTRONIC TECHNICIAN:

Considering the complaints you arereceiving on the delivery time of yourmagazine [August Letters], you mightwant to know that at least this techni-cian appreciates the fact that you do notfalsely date your issues one monthahead. I've been in the field since 1932,and I receive only three trade maga-zines. August issues of all three arrivedwithin one week. Those who complainedshould retain their subscriptions so theywill continue to receive accurate andup-to-date information. -

VERN W. MAXWELLRadio & TV Sales and ServiceCantrall, Ill.

(Continued on page 18)


For dependability and

long life use

ZENITH QUALITY BATTERIES

EXTRA PROFIT ITEM!Zenith Mercury Batteries

Zenith pioneered the use of Mer-cury cells for transistor radios.They are easy to sell, becausethey provide up to four timesthe playing life of ordinary cells-and they provide extra profitsbecause of higher unit price.

Specially engineered fortransistor radio operation

Dependability is built into every battery that carriesthe Zenith name. Advanced design provides maxi-mum hours of listening pleasure. Special constructioninsures long life and keeps batteries fresh longer.

Rigid manufacturing specifications, productionquality controls and performance tests make doublycertain that all Zenith batteries are completely de-pendable and insure customer satisfaction. A com-plete line of Zenith batteries is available from yourZenith distributor.

40 years of leadership in radionics exclusively.The quality goes in before the Zenith name goes on.

SEE YOUR ZENITH DISTRIBUTOR

INAfrif MEANS QUALITY

ZENITH RADIO CORPORATION PARTS AND ACCESSORIES DIVISION6001 W. DICKENS, CHICAGO 39, ILLINOIS

15ELECTRONIC TECHNICIAN September, 1958

CHYrjW,r0A1 09'

0

11.1111,

_J1)1

A

Rem/4 Jiy6Fa limy!

"elf co,P7/C Zoo."/

e-h.e

4V.4%ose. -4Pmese

,.ztr`..=4Ar..e.

Colorful comic books, window streamers, window display tori U help tell your customers all that goes into servicing TV sets!

It takes a lot of work, costly equipment and know-how to be a radio and TV serviceman. No oneknows this better than you. But, chances are,your customers don't!

But now you can give them an insight into yourwork with this free "The Story Behind TV Serv-ice" kit that tells how complicated your job is . . .

X10 JG3 Y17

how much study it required to learn . . . and howexpensive it was getting started. Told in interest-ing cartoon technique, the booklets are somethingeveryone will read-and understand!

So put these good -will ambassadors to work build-ing consumer confidence for you.

0 D. IGHTIJMI

YOU CAN BE SURE...IF ITNVestinghouseElectronic Tube Division Elmira, New York


The Volkswagen Panel Delivery gives you more usa-ble, easily accessible loading space . . . 170 cu. ft.,with a payload of 1830 lbs. You can install a completeshop inside for tools, parts and test equipment. Thissaves time, money and unnecessary trips. Plus:plenty of advertising space to promote your business.

Besides Volkswagen's roomy and practical design, outstanding gas economy, ease of handling andparking, its great popularity is based on its remarkably low maintenance. The engineered depend-ability of every Volkswagen is backed up by world-famous \%:// service in all 49 states. When serviceis needed, every ei owner gets the best. The investment in a Volkswagen Truck pays dividends.Real savings mile by mile add up year by year. Ask your authorized $,/, dealer to show you the oper-ating cost records for a Pick-up Truck, Panel Delivery, or Kombi Station Wagon. A Volkswagen costsless to buy, run, and maintain.

VOLKSWAGEN DELIVERS THE GOODS...FOR LESS!

ELEC AN September, 1958VOLKSWAGEN,

MI MIH IMSEIMMI IN IDMI M8

gIIIMI INE N IN

11111

IIII

111118

MI 1E211111111MI MI

IIIIIMI InII IIElNI 11

IN MNIN NMN MI IIIIN I IN IMIt III

it INN NIN II 1111111 IN IN1111

ININ1N

N MI11111

1111MN IN

000

OO0

0O

N

00OsD

000La

000

RCA"SPECIAL RED"

TUBES10,000 hours-

minimum tube life

Recommended whenever un-interrupted service, unat-tended operation, and abso-lute reliability are demandedin industrial electronic equip-ment. Each tube is warrantedfor 10,000 hours, minimumlife. Available at your RCAIndustrial Tube Distributor.

MIA

UN I FORMRELIABILITY

RADIO CORPORATION OF AMERICAElectron Tube Division Harrison, N. J.

New characteristics booklet (RIT-104A) on RCA"Special Red" Electron Tubes-and other RCA Receiv-ing -Type Tubes for Industry and Communications.For your free copy, write RCA Commercial Engineer.ing, Section I -46-Z, Harrison, New Jersey.

(Letters. Continued from page 14)

We're LifesaversEditor, ELECTRONIC TECHNICIAN:

I am very pleased with my subscrip-tion to your magazine. Your July 1958issue was my lifesaver. My scope isworking again.

ALBERT J. ZIMAPittsburgh, Pa.

Transistor N 'n PEditor, ELECTRONIC TECHNICIAN:

I have been wondering why the tran-sistor manufacturers don't use theletters P and N, instead of just N, as in2N111. I'd suggest they use the letter Pin designating PNP units, and N forNPN types.

THELMAR LELANDJoliet, Montana

A WinnerEditor, ELECTRONIC TECHNICIAN:

You may be interested to learn thatmy first draft of the winning entry inthe RCA Serviceman Contest this springwas made on the entry blank on theback of your publication. This won methe top prize in this area of an MGroadster. My own initials!

M. G. GOLDBERG

Beacon Radio & TV ServiceSt. Paul, Minn.

Joining IREEditor, ELECTRONIC TECHNICIAN:

I am interested in industrial elec-tronics and communications. How doI get into the Institute of Radio En-gineers?

MITCHELL E. MILLERAugusta, Ga.

Write for an application blank to theInstitute of Radio Engineers, 1 E. 79 St.,New York 21, N.Y. The application re-quires references from three IRE mem-bers. And don't forget membership inyour local service association.-Ed.

Association ListingEditor, ELECTRONIC TECHNICIAN:

Our association was conspicuouslymissing from your May Directory list-ing. TEA of Houston, Texas has been inexistence since Oct. 13, 1949, beginningwith 12 members. Now we have justunder 100 member shops, including mostof the larger independents. We are partof the TEA statewide organization, andare not affiliated in any way with ETAor TESA (HATS) of Houston.

WM. A. SMITHSecretary

Texas Electronic Technicians Assoc.Houston, Texas


VMDesigns Amazing No. 25 Tower to reach

new heights in tower engineering

COMMUNICATIONOR HEAVY-DUTY

TV TOWER

NEW GENERAL-PURPOSE dons to 50' and under guyed conditions

ROHN now offers a tower a full 3

stronger and more durable thtowersanthsimilar

sized and similar typeat are

found on the market today!

25 These amazing results are achieved

through using heavier -duty side rail

tubing, quality steel that is of the higrac-h-

est grade and a new "zig-zag" cross b

The strength of this tower allows iting design.

to be self-supportingunder most condi-

up to 150'. The tower has been built to

fit a tremendouslywide range of nee s

in communications,amateur use and as

a heavy-duty TV tower.

FLASfilThe "RohnKote" enameling

plant is in operation and ROHN prod-

ucts areD

aailable not on in HOT-

IPPEDv GALVANIZINGbut oals

in a speciallydeveloped 6 -step enamel-

ing process known as "RohnKote".

NOW/10 Different Lines of ROHNTOWERS, Including:

No. 6Widely used forhome TV, thisow features

"magicer triangle"cross bracing con-struction.

Look to ROHN for these

requirements, too:

A wide line of all types of accessories for

towers is available but in addition, ROHN

produces a complete line of:

ROOF TOWERSMASTS`ROHN

masts are Specially designed

outstanding in de- roof towers have re-

sign and have spe- ceived tremendously

features that wide acceptance andvial f

e them the best are available frommakein the field and in heights of 21/2' to

10'addition, are as low .

or lower in cost than BASESany other. A wide selection for

TUBINGmast andother type

leteComp line of installations; inex-wall

tubing, either plain mounts-for

or with 6" expandedpensive installations;

end; in 10' and 5' gable mounts; spe-

length; 16 or 18 vial mounts for an -

gauge; and in either tennas; drive-in

hot -dipped galvan- ground mounts; and

ized or ''RohnKote-dozens of other spe-

enameling.cially designed items.

Make sure you have full details, catalog andprices on the entire ROHN line. Contact theROHN representative in your area, or distribu-tor, or contact:

.Packaged Towersin which the sec-tions nestle insideeach other.

No. 40Heavy-duty com-munications towersuitable self-sup-porting at heightsup to 60' or guyedas high as 300'.Ideal for commu-nications uses ofall types, micro-wave, radio tele-phone, etc.

No. 20 & 30Heavy-duty com-munications tow-ers in RohnKoteenamel.

Fold -Over TowersIdeal for amateurs and experi-menters inasmuch as the towerfolds over for convenient an-tenna changing, etc. Suppliedin both medium and heavy-duty sizes to handle practicallyany size beam.

Manufacturing Company116 LIMESTONE, BELLEVUE

PEORIA, ILLINOIS PHONE 4-9156


All-American 1957 Award winners met Demo.er 10 at Washington, D. C. The Hon Walter WilliartsUndersecretary of Commerce-center, front rcw-was guest speake- at the presentction ceremonyand banquet. Winners came from nine states. Each winner received a handsome trcph, and a checkfor $500 for community -activity or charity use In adcatior, his expense.s to Wash ngtan were pa d.

1958 ALL-AMERICAN AWARDS AGAINWILL SPOTLIGHT COMMUNITY SERVICEBY TV TECHNICIANS!In LIFE on September 22, General Electric will advertiseto 25,000,000 readers how they can help honor the manyunselfish activities of TV technicians the nation over.

Afterwards-with its climax the December All-AmericanAward presentations-a three months' General Electricadvertising and public -relations campaign will underscorethe message so forcefully presented in 1957: that the tech-nicians who render television service, always are first torespond when public need arises.

Your professional standing-your service volume-willbenefit from the recognition the 1958 All-American Awardcampaign brings you. Identify yourself closely with thisnationwide program! Ask your G -E tube distributor fordisplay and other material to help make your shop All-American headquarters! Distributor Sales, Electronic Compo-nents Division, General Electric Company, Owensboro Ky.

7:3 -ogress Is Our Most Important Product

GENERAL ELECTRIC

YOUR TV SERVICE TECHNICIAN..

Helping others is his hothy!

.1.11111.1M, Le oorkftemoil...a Ara

Iteatom .10'236.daraa.dettlsile........10.1.,.Mewl Y. mom. re. Ls.. TA, Se,nr. Iniuc A 'main.....W100011.1* On A1140404.1.1212 1.0

ELECTRIC

11.II126

New BooksBooks marked with an asterisk 1'1') may beobtained prepaid from Electronic Technician

*MAGNETIC RECORDING TECHNIQUES. ByW. Earl Stewart. Published by McGraw-Hill Book Co. 272 pages. Hard cover.$8.50.

This technical text on magnetic re-cording devices, performance and oper-ating procedures should appeal to theadvanced technician involved in audiowork. From basic recording and re-producing processes, the text gcesthrough materials, ferromagnetism,mechanisms, recording standards andequipment function and design.

*OSCILLOSCOPE TECHNIQUES. By AlfredHaas. Published by Gernsback Library.224 pages. Soft cover, $2.90; hard cover$4.60.

Hundreds of scope pattern photos areincluded in this practical volume onworking with the oscilloscope. Acces-sories such as the electronic switch,wobbulator, calibrator and marker aredescribed, along with fault patterns,methods of checking receiver circuitsand display characteristics of rectifiers,tubes, dielectrics and other componentsare discussed.

TECHNILOG. Prepared by UniversityLoudspeakers, 80 S. Kensico Ave.,White Plains, N.Y. 64 pages. Soft cover.$1.

A most informative manual on soundsystem planning, complete with charts,tables and product information on thecompany's line, this book focuses on awide variety of speakers. Selection andinstallation for various applications areexplained in detail. Included are driv-ers, reflex trumpets, projectors, pagingspeakers, explosion -proof and submerg-ence -proof types and line matchingtransformers.

HOW 10 MARK GOOD:. FOR A PROFIT. ByIrving Goldenthal. Published by Chil-ton Co., 56 & Chestnut Sts., Philadel-phia 39, Pa. 57 pages. Soft cover. $1.25.

This compact little book presents thebasic elements of cost and pricing anal-ysis, including markon percentages,cash discounts and retail psychology.Typical problems are presented forpractice computation. It's an elementarybook for the merchandising beginner.

*ELECTRONIC COMPONENTS HANDBOOK.Edited by Keith Henney and CraigWalsh. Published by McGraw-Hill BookCo. 368 pages. Hard cover. $12.50

Intended primarily for equipment de-signers, this second volume also con-tains much information of interest toelectronic technicians. Subjects coveredinclude power sources, fuses, cir-cuit breakers, indicating instruments,printed wiring, solder, blowers andtransmission lines.

TOBE MYLAR* MOLDED TUBULAR CAPACITORS

Molded of DuPont Mylar, one of the finest insulation materialsever developed.

Thermoset Case Construction secures leads and sections firmly towithstand extremes of handling, vibration, shock and solderingtemperatures.

High Insulation Resistance: Average megohm values per unit10,000 at 25°C. Small capacitance variation with thermal change.

Temperature Operating Range: -55° to +130°C. Moisture Resistant: Exceeds JAN -C-91 requirements. Non -Inductive: Extended foil construction insures low resistance

connections and low RF impedance.

DESIGNED FOR SERVICE DEALERS

Today, orderyour Tobe MylarKit from your

Tobe Distributor

NEW TOBE MYLAR* CAPACITOR KIT

FREE KIT CONTAINS80 CAPACITORS

ONLY

$1584Compact, clear -plastic dispenser contains an assort-ment of 80 Tobe Mylar capacitors in the most popularsizes, ratings and quantities for quick, efficient servic-ing. Covers over 60 different ratings at 200, 400 and600 working volts and from .0001 to 1.00 mfd. Dealerpays only for the Tobe Mylar capacitors, kit is free.

CAPACITORSDuPont trademark TOBE DEUTSCHMANN CORPORATION, NORWOOD, MASSACHUSETTS

Consistently Dependable

The extra values are"on the house"

Want more capacitor for your dollar? Here's how:Cornell-Dubilier has originated a "preferred -type" program on twist -

prong electrolytics. Now, a relatively few types fill over 90% of allreplacement requirements. You need less - to do more. Fewer typesmeans improved production efficiency, lowered costs - savings to you.How is it done? Instead of producing hundreds of types with odd andcritical capacitance and voltage ratings, each "preferred type" carriesthe highest value and rating called for in each category. In most casesyou get more capacitor at lower cost - plus added safety factor, im-proved performance and "call-back" protection. It's on the house!To get more capacitor for your dollar, ask your C -D Distributor aboutPreferred Type Twist -Prong Electrolytics or write Cornell-DubilierElectric Corporation, South Plainfield, New Jersey.

CORNELL- DUBILIERCAPACITORS

MAGNETIC TAPE RECORDING. By H. G. M.Spratt. Published by The MacMillan Co.319 pages. Hard cover. $8.50.

This thorough technical text startswith principles of magnetism and re-cording, goes through tape manufactureand testing, and into recording ma-chines for music and dictation. Onechapter is devoted to testing tape re-corders, and another covers tape re-cording applications such as machinetool control, medical and data recordinguses.

Specially SelectedList of Electronic BooksSee Paces 36 & 37

News of the Industry

INTERNATIONAL RECTIFIERCORP. has promoted J. T. CATALDOto Vice Pres. in charge of sales.

VOKAR CO. has moved to largerquarters. The new address is 201 EastCatherine St., Ann Arbor, Mich.

PACO ELECTRONICS CO. is nowmaking test equipment kits availablefactory pre -wired, tested and calibrated,to supplement the existing series.

GENERAL ELECTRIC ReceivingTube Dept. reports that the 1958 All-American Awards program will, as inthe past, bring trophies and checks for$500 to ten TV service technicians whohave performed outstanding communityservices. Nomination deadline is Oct. 12.

P. R. MALLORY & CO. INC. an-nounces the promotion of IRA SLATERto Manager, Sales Engineering, Vibra-tor Division, from Sales Manager of thedivision. FRED H. LARRABEE, JR. be-comes the division's Sales Manager.

GOOD -ALL ELECTRIC MFG. CO.recently dedicated the opening of thefirm's fifth separate manufacturing plantin Ogallala, Nebr. Electronically oper-ated golden shears cut the ribbon open-ing the new plant.

JERROLD ELECTRONICS CORP.has purchased the Muscle Shoals Tele-vision Cable Corp., which brings to 10the number of community antenna sys-tems owned by the firm, and the num-ber of subscribers to approximately30,000. Also, continuing their sales or-ganization expansion program, JERE-MIAH E. HASTINGS has been ap-pointed Assistant Sales Manager ofSystem Sales Division.

JENSEN MFG. CO. reports thatFRANK D. LINTERN has joined thefirm as Assistant Sales Manager of theDistributor Division.

CBS-HYTRON announces a new fullcolor 19" x 231/2" picture tube displaycard, which tells customers "You cancheck your own picture tube." The cardasks questions and gives answers to po-tential tube purchasers.

INTERNATIONAL TELEPHONE &TELEGRAPH CORP. reports the ap-pointment of JOHN E. GINGRICH, VicePres., as Director -Special Programs forITT. GINGRICH, formerly Pres. ofFederal Telephone & Radio Co., a divi-sion of ITT, will be succeeded in thatpost by DELBERT L. MILLS, Exec.Vice Pres. of FTR.

VACO PRODUCTS CO. reports thepromotion of ROY VETZNER, fromSales Manager, to Vice Pres. and Direc-tor of Sales. Also, SAM POLLACK, aDirector of the Company, has beennamed Executive Vice Pres. and Treas.

CORNELL-DUBILIER ELECTRICCORP. and the RADIART CORP. hasnamed the top prize-winner in theirnationwide contest as FREDERICKDIEHL, TV service manager for TRAY -NOR DEAN, Tampa, Fla. He has beenawarded a new 1958 Plymouth stationwagon for submitting the best name forthe new TR 15/16 CDR Antenna Rotorthat is being marketed by both firms.There were over 15,000 entrants.

Reps & Distributors

NAT'L ELECTRONIC DISTRS ASS'N(NEDA) will hold its 13th RegionalSeminar at Kansas City, Mo., Sept. 19,20, and 21. NEDA states that those in at-tendance at the previous 12 seminarsderived many benefits from these shortcourse educational forums.

TRIAD TRANSFORMER CORP. hasadded the following sales representa-tives: BERLIANT ASSOCIATES, withoffices in Long Island, Albany and Syra-cuse, for upper New York state;BLAIR-STEINBERG CO., with officesin Yonkers and Moorestown, N. J., formetropolitan New York; GENE S. ROOT& CO., Pittsburgh, for western Penna.and W. Va.; ARTHUR H. BALER CO.,Cleveland, for Ohio jobber sales;FRANK KAHSAR, Cincinnati, forOhio industrial sales; CHARLES BOIS-SENET, TRIAD TRANSFORMERCORP., Huntington, Ind., for Ind. jobbersales; E. S. NEEDLER, Ft. Wayne, forInd. industrial sales; HENSCHEN,JENSEN & CO., Detroit, for Mich.

Built to last...a type for every radio

The C -D brand name on a vibrator is your guarantee of dependableperformance, long trouble -free service. Because C -D vibrators arebuilt to last, you can use them with full confidence. That's why itpays to reach for a C -D when a replacement is called for.

Remember, too, that there's a C -D vibrator type for every make andmodel car on the road. And the C -D VIBRATOR REPLACEMENT GUIDEmakes it quick and easy for you to select the exact type required.Ask your local C -D distributor for a free copy of VIB-3, or write toC-rnc ll-Dubilier Electric Corp., S. Plainfield, N. J. Dent. 7.T-98.

CORNELL-DUBILIER®° VIBRATORS

Old Hands at Dependability

All new featuresCompletely designed from the ground up, CDR Model TR-15 andTR-16 Rotors have features never before available in the popular pricerange. Check these refinements and you'll see why : Quick mountingmast collet . . . speedy installation (no loose parts to assemble) . . .

self -centering sawtooth clamps take masts up to 11/2" 0.D.... instantlocking prevents drift ... mechanical brake releases magnetically ...instantly reversible ... makes complete revolution in 45 seconds ...meets JAN salt water test... great strength thrust bearing support...low weight ... completely weather -sealed ... fits standard towers ...streamlined to reduce wind resistance ... mahogany or blonde *lashcontrol box. Get full details today from your local CDR distributor.

CORNELL-DUBILIER ELECTRIC CORP. THE RADIART CORPORATIONSouth Plainfield, New Jersey Indianapolis, Indiana

CDR® Izto Antenna Rotors


VOKAR CO. has appointed MINGINSSALES CO. as the firm's metropolitanNew York distributor representative.

JERRY GREENBERG ASSOCIATES,mfrs' rep firm, is now located in newquarters at 514 Broadway, New York12, N. Y.

JERSEY SPECIALTY CO. reports ap-pointment of MORTON L. FRIEDMAN,Chicago, Ill., as the firm's representativefor Ill. and eastern Wisc.

PEERLESS PRODUCTS INDUS-TRIES has announced the appointmentof 3 representatives: J. F. ANDERSONCO., Alexandria, Va.; E. L. PARK,Southampton, Pa.; THOMAS P. AN-DREWS & CO, Lakewood, Ohio.

HENRY LAVIN ASSOCIATES an-nounces that VERNON A. LEE, for-merly sales manager of Sessions Clock'sindustrial products div., has joined theirorganization as associate sales engineer.

THOMAS SHELBY & CO., 319 S.Franklin St., New Bremen, Ohio, is anew rep firm serving distributors andmanufacturers in Ohio, western Penna.and W. Va. SHELBY formerly was gen-eral sales manager for CROWN CON-TROLS CO.

"THE REPRESENTATIVES" of Elec-tronic Products Mfrs. has set up a newgeographical district system by whichthe country is divided into three dis-tricts. Each district is headed by its ownvice president, who have been ap-pointed as follows: NORMAN KATH-RINUS, of St. Louis, Central District;WALLY SHULAN, Jersey City, N. J.,Eastern District; W. BERT KNIGHT,Los Angeles, Western District.

ERIE RESISTOR CORP. announcesthe following appointments as sales repsfor the distributor div.: JAMES ECK-ERSLEY, Portland, Ore., for the North-west territory; BRANUM SALES, Dal-las, Texas, for the Southwest territory.HAROLD MOYER, Haddenfield, N.J.will handle sale of amplifier kits, tunersand cartridges for the Mid -Atlantic ter-ritory. MARTIN & DIAL, HighlandSprings, Va., will sell these products inVa.

Catalogs & Bulletins

COMPONENTS: A new 24 -page catalogcovers pressurized and waterproof plugsand receptacles; caps; waterproof cableclamps. Includes illustrations and speci-fications. H. H. Buggie, Inc., P. 0. Box817, Toledo 1, Ohio (ELECTRONICTECHNICIAN B9-3)

CAPACITORS: Type WT, wire tantalumcapacitors in subminiature sizes arecovered in a catalog sheet. Operatingtemperature, voltage, ratings, stockvalues and other specifications are in-cluded. Aerovox Corp., New Bedford,Mass. (ELECTRONIC TECHNICIANB9-1)

CAMERA ENCLOSURES: A new catalogsheet describes and illustrates weatherproof and dust proof enclosures forclosed-circuit TV cameras. Both air-cooled and water-cooled units arecovered. Dage Television Div., Thomp-son Products, Inc. Michigan City, Ind.(ELECTRONIC TECHNICIAN B9-6)

WIRE MARKERS: A new 8 -page, 3 -colorcatalog covers a wide variety of pres-sure sensitive wire markers which areavailable on instant -release dispensingcards. Illustrations and price lists in-cluded. North Shore Nameplate, Inc.,214-27 Northern Blvd., Bayside 61, N. Y.(ELECTRONIC TECHNICIAN B9-7)

TRANSFORMERS: Catalog No. P258G is acomprehensive reference manual of 102pages designed to serve as a guide forthe selection and ordering of variabletransformers. Connection diagrams andratings are included. Superior ElectricCo., Bristol, Conn. (ELECTRONICTECHNICIAN B9-11)

TEST EQUIPMENT: A new catalog, No.ASC-300, describes: The AR -660 Mul-titester, a miniature unit weighing10 oz., and the AR -230 Power Mega-phone weighing 41/4 lbs. including bat-teries. This megaphone is a hand-heldtype, with pistol grip. Argonne Elec-tronics Mfg. Corp., 165-11 South Rd.,Jamaica 33, N. Y. (ELECTRONICTECHNICIAN B9-2)

CAREER GUIDEBOOK: "How To MakeMoney In Radio, TV, Electronics &Color TV" is a 16 -page catalog givingfull descriptions of radio -TV coursesand complete listing of all lessons foreach course. The Career Opportunitiessection gives a breakdown of positions,qualifications, salary range, etc. Radio -Television Training Association, 52 E.19 St., New York 3, N. Y. (ELEC-TRONIC TECHNICIAN B9-9)


Consistently dependable powerNext time an auto -radio vibrator replacement is called for,try Radiart. There's a complete line for all 6 -volt and 12 -voltapplications. And no waiting for the type you want, becauseyour local Radiart Distributor maintains a full stock for yourconvenience Ask him for your free copy of the Radiart Vi-brator Replacement Guide, or write to Dept. ET -9, The RadiartCorporation, Indianapolis 5, Indiana.

4113qtIBV Vibrators


has set the most spectacular record in receiving tube historyWay back in 1937, the Raytheon Manufac-

turing Company introduced and produced theRaytheon OZ4 -a gas -filled rectifier tube de-signed specifically for car radios. So nearly per-fect is this tube in design, construction and op-erating ability, that it has never been equalled.For more than 21 years it has withstood per-formance challenges from many prototypes,but, one by one, all have fallen by the waysideand the Raytheon designed OZ4 remains theideal tube for the job it was designed to do.

We point with pride to the OZ4 triumph be-cause it is engineering and design know-howlike this, teamed with production skill andcraftsmanship, that goes into the design andmanufacture of the complete line of RaytheonTV and Radio Tubes. That's why you can useRaytheon Tubes for replacement work withcomplete confidence that you are giving yourcustomers tubes that are second to none in de-sign, in quality, in performance - tubes thatare truly RIGHT ...for SOUND and SIGHT!

And Now From Raytheon, The "Voice" of The Satellites

Today, as yesterday, Raytheon leads the way. Raytheon Transistors help sendcoded messages from America's Satellites to receiving stations on earth. 14 ofAmerica's major guided missiles use Raytheon Tubes and Semiconductors -further proof of the superior performance, dependability and manufacturingexcellence of Raytheon products.

RAYTH EON MANUFACTURING COMPANYDISTRIBUTOR PRODUCTS DIVISION

NEWTON 58, MASS. CHICAGO, ILL. ATLANTA 6, GA. LOS ANGELES 7, CALIF.55 Chapel Street 9501 Grand Ave. (Franklin Park) 1202 Zonolite Rd. N.E. 2419 So. Grand Ave.

Raytheon makes t Receiving and Picture Tubes, Reliable Subminiature and Miniature Tubes,all these S Semiconductor Diodes and Transistors, Nucleonic Tubes, Microwave Tubes.

4YTHEON

excellence in etecInnsie4


ELECTRONICInc tiding

Circuit Digests

Stereo New Opportunity for Technicians

Stereophonic sound is the latest and most ex-citing development in high fidelity. It has stirredthe public's desire to add the dimension of depthto its listening pleasure.

Service technicians have been playing an increas-ingly important role in installing, selling and re-pairing monophonic hi-fi. With stereo their roleis vital.

This month marks the opening of the stereoboom. Stereo equipment has already been placedon the market by many manufacturers; still more

village and city will be actively interested in addingstereo to their home entertainment. Stereo hasbroad market appeal, far beyond the limited audio-phile interest of past years.

The overwhelming majority of potential stereocustomers are not skilled in electronics. Only arelative few are technically qualified to converttheir monophonic sound systems to stereo. Sowhether a complete new stereo installation is re-quired, or a conversion, the electronic service tech-nician is the man to do the job. He has the know-how, instruments and invitation into the home.

Service dealers are selling, as well as servicingstereo. Those who can afford to stock such equip-ment often buy directly from the manufacturer.But most act as non -stocking dealers, buying com-ponents from their local hi-fi distributor at a dis-count below consumer price. When a service dealermakes a sale, he derives profit both from the dis-

count margin and the installation charge.The technician is the only electronic expert in

regular contact with the public, so consumersnaturally turn to him for hi-fi advice. Based ona recent study by the Institute of High FidelityManufacturers, during the past year, over 8,000,000Americans did just this. With stereo now on itsway toward a fabulous future, still more consumerswill be asking for your advice . . . and services.

To help you answer consumer questions on stereo-and to provide you with the basic backgroundrequired for getting stereo business-a completesection of this issue is devoted exclusively to thesubject. In addition to technical articles and a stereomanufacturer directory, this pioneer publishingproject-STEREO 1959-includes the first stereoproduct catalog. For your own reference, and tosell or give away to your prospective stereo cus-tomers as part of an educational -sales program,extra copies of STEREO 1959 are available at mod-erate cost.

If you have ever hoped to get in on the groundfloor of some financially rewarding phase of elec-tronic servicing, we can only say that stereo is it.Putting it off will only mean that other electronic -TV service outlets will have become the hi-fi stereosales and service centers in their areas.

Get into stereo now. If you have technical orbusiness questions, ask ELECTRONIC TECHNI-CIAN'S editors. We have helped other readers getstarted. We can help you.


t'itllitig In theUHF VIEWER HOMES decreased 8% from 3,864,-560 in 1956 to 3,563,960 in 1958, reports Nielsen.However, the ratio of UHF -TV viewers to non -viewers in areas served by UHF stations actually in-creased because the total number of TV homes inthese areas decreased 24% to 5,238,180 currently.Geographic breakdown of UHF homes, together with2 -year gain or loss, is as follows: Northeast, 1,108,-160, up 15%; North Central, 1,465,480, up 4%; South,701,020, down 31%; West, 289,300, down 38%; andPacific, 289,300, down 38%.

SUBSCRIPTION TV has been placed on the shelfagain. Under pressure from Congress not to grant payTV licenses until legislation has been considered, theFederal Communications Commission has decided notto grant trial authorizations until the adjournment ofthe next session of Congress. The FCC will continue toaccept applications, however, while maintaining thestatus quo.

CRT ELIMINATES FACE PLATE

New picture tube (top) developed by Pittsburgh Plate Glass eliminatesconventional safety glass (bottom). Curved etched window is lami-nated to tube face by layer of polyester resin. Improvements reportedare less reflection, 8 to 9% brightness increase, no inside glass sur-face cleaning, and 3 to 4 in. shallower cabinet depth possible.

FEDERAL TRADE COMMISSION has approved aconsent order prohibiting Muntz TV from exaggerat-ing the horizontal size of picture tubes in its sets, ormisrepresenting that the sets are sold directly fromfactory outlets when they were in fact sold by retailerswho buy the receivers from the company. When diag-onal measurements are used in promotion, this fact orthe actual viewing area in square inches must beconspicuously disclosed.

BUSINESS UPSWING in the third and fourth quar-ters of 1958 is expected by most manufacturers, re-ports the National Credit Office.

EMPLOYMENT OUTLOOK FOR TECHNICIANS, areport by the Bureau of Labor Statistics and VeteransAdministration, states that technicians who work withengineers are one of the fastest growing occupationalgroups. The government employs over 31,000 tech-nicians, with close to 6000 of them electronic technicians.Two out of three earn between $4525 and $6250. Inprivate industry, electronic technicians earn between$1.75 and $3 an hour. Listed as VA pamphlet No. 22.1,the report is available from the Superintendent ofDocuments, Washington 25, D. C., for 250.

NEW SEMICONDUCTOR DEVICE called a siliconcontrolled rectifier is capable of replacing relaysand certain industrial power tubes, according to itsdeveloper, General Electric. These rectifiers, still inthe laboratory stage, will. be ready for commercialuse in motor controls and switching panels in thefall of 1958. Their application in home appliances isat least two or three years away.


PictureP,.....OLD STORY. Los Angeles newspapers played up thearrest of employees and owners from three TV repairfirms for fraudulent overcharges. Bunko squad de-tectives were quoted as saying the arrests were "onlythe beginning." Not even in small type was mentionmade of the hundreds of thousands of customers whoreceived good service at fair-or even too low-cost.

ELECTRONIC SEX DETECTOR was displayed byFarnsworth Electronics Div. of ITT at the Wesconshow in Los Angeles. Show visitors stepped in frontof an infrared magic eye, causing a "man" or"woman" light to flash. It's done by heat detection,a woman radiating more heat than a man. Men'strousers inhibit heat radiation reaching the detector,while women's stockings do not. Of course, the ma-chine is not too clever; a man in shorts could easilyconfuse it.

Visit ELECTRONIC TECHNICIAN

New York High Fidelity Music ShowRoom 420, New York Trade Show Building

September 30-October 4, 1958

PatidOMAIOSE-i ii

c2-0STEREO

ONE OUT OF EVERY 4 FM STATIONSAFFILIATED WITH AM STATIONS ARE BROAD-CASTING PM/AM STEREO PROGRAMS

Sept.

Sept.

Oct.

CALENDAR OF COMING EVENTS

15-19:

24-25:

1-2:

Oct. 2-4:

Oct. 8-10:Oct. 13-15:

Oct. 19-21:

Oct. 27-29:Oct. 30-31:

Nov. 20-22:Dec. 3-5:

Dec. 9-11:

Instrument -Automation Conference and Exhibit, Conven-tion Hall, Philadelphia, Pa.Industrial Electronic Conference, Rockham MemorialBldg., Detroit, Mich.4th Conference on Radio Interference Reduction andElectronic Compatibility, Museum of Science & Indus-try, Chicago, Ill.Electronic Trade Exposition, Minneapolis Auditorium,Minneapolis, Minn.IRE Canadian Convention, Exhibition Park, Toronto, Can.National Electronics Conference, Hotel Sherman, Chi-cago, Ill.Electronic Industry unity Conference, The Concord,Kiamesho Lake, N. Y.Radio Fall Meeting, Sheraton Hotel, Rochester, N. Y.Electron Devices Meeting, Shoreham Hotel, Washing-ton, D. C.

56th Meeting Acoustical Society of America, Chicago, Ill.Eastern Joint Computer Conference, Bellevue StratfordHotel, Philadelphia, Pa.Mid -America Electronics Convention, Municipal Audi-torium, Kansas City, Mo.

Hi-Fi Shows

Sept. 19-21: Chicago. Palmer House.Sept. 30 -

Oct. 4: New York. (Institute Hi-Fi Mfrs.) N.Y. Trade Show Bldg.Oct. 10-12: Philadelphia. (Institute Hi-Fi Mfrs.) Benjamin Franklin

Hotel.Oct. 17-19: Boston. Hotel Touraine.Oct. 24-26: Milwaukee. (Institute Hi-Fi Mfrs.) Wisconsin Hotel.

Rigo Enterprises Hi-Fi Shows

Sept. 19-21, Syracuse; Sept. 26-28, Rochester; Oct. 3-5, St. Louis;October 10-12, Cincinnati; October 17-19, Detroit; Nov. 7-9, Omaha;Nov. 14-16, Kansas City, Mo.; Nov. 21-23, Seattle.

70.41H/Gabv5 -7211.

DO YOU KNOW.,3,565,960

HOMES RECEIVEUHF -TV/

COMPRESSED AIR LOUDSPEAKER BY RCA GENER-ATES IGO DB NOISE -20,000 TIMES AS

GREAT AS NORMAL HOME PHONO LEVEL -IT'S REPORTED TO BE WORLD'S '.OUDEST

CONTROLLED NOISE.


What Every Technician Should Know About

Atomic Radiation AndBasic Facts On Health Hazards, Allowable Dosage

ALBERT J. FORMANEDITOR

Some people call this the AtomicAge. Others call it the ElectronicAge. The two are closely related,not only by their mutual utilizationof sub -atomic particles, but also bythe use of electronic devices to con-trol and measure atomic energy.For the future, we may expectatomic energy to be used to powerelectronic equipment.

All of us live in this era of radio-active fallout, charged atmosphereand still more highly charged emo-tions, wondering, curious, evenanxious. Machines such as dentalX-rays and TV receivers are nowviewed with a more critical eye. Theelectronic technician, as the techni-cal expert in greatest contact withthe public, should have more thanaverage interest in this subject.

Let us view the basic facts aboutatomic radiation. Through under-standing, our curiosity and concernmay be placed in proper perspec-tive.

Before the A -Bomb

In 1895, fifty years before theatomic bomb, X-rays were dis-covered by Wilhelm Roentgen. Es-sentially, X-ray radiation is theproduct of charged particles strikingtargets made of certain substances.

Shortly thereafter, Henri Bec-querel and Pierre and Marie Curiediscovered the radioactive effects ofthe unstable element radium whenit disintegrates and transforms itselfinto another element. Many otherscientific pioneers became interestedin radiation, and it was not long be-fore two major medical facts wereestablished: Radiation could curepeople; Radiation could kill people.

Basic DefinitionsThe following technical terms are

basic to the understanding of atomicradiation:ROENTGEN (abbreviation: r)Quantity of radiation absorption,measured by the number of ions

produced in a cubic centimeter ofair at standard conditions.CURIE: (abbreviation: c) Quantityof radioactivity, or disintegrations/second, given off by 1 gram of ra-dium.HALF-LIFE: Time for a substanceto decay to half its current radio-activity.

Health Hazards

Three factors make radiation (thisarticle refers only to atomic or nu-clear radiation, not electromagnetic)a matter of particularly seriousconcern.

1. Radiation effects on humans arethe same whether the source beman-made X-rays, natural radio-active ores, or artificial isotopes(atomic variations of the same ele-ment) from H-bomb fallout.

2. Unlike X-rays which may beturned off, radioactive matter con-tinues to give off its penetratingparticles for a long time. The half-life of radium, for example, is 1600years; after 6400 years it would stillretain 1/16th of its radioactivity. Forstrontium -90, half-life is 28 years.

3. The cumulative impact of ra-diation is serious. That is, a radio-active dose does not simply strikethe body and go away. Part of itadds to the total of all radiationabsorbed previously. Perhaps aftera latent period, many years later,the effect shows up in destroyed tis-sue such as eye cataracts, in steril-ity, undesirable genetic effects, ordeath.

We must temper our concern overradiation with the realization thatit offers medical benefits. X-raystake photos of broken bones. Directradiation sometimes cures cancerand ulcers. Radioactive tracers canshow malfunctions in the digestiveand blood systems. The problem isin control and understanding.

How Radiation DestroysThe process of radiation destruc-

tion of human tissue is extremelycomplex. Essentially it relates to thebreakdown of normal functions in

the living cell. This is the result ofradiation -caused ionization, whichin turn triggers a chemical chainreaction.

The actual destruction or disturb-ance of molecules in the cell is notthe direct cause of major damage. Adose large enough to kill a manwould only affect about one mole-cule for every 12 million in the cell.However, the fluid in the cell alsoreacts to radiation, decomposing asmall part into free radicals. Theseinteract to form poisons, whichdamage the vital enzyme and othermolecules in the cell.

Here the multiplier effect takesplace, one enzyme molecule chang-ing thousands of other moleculesneeded to keep the cell alive andhealthy.

Poisons from the dead cells, in-adequate blood supply, and otherlocal effects destroy still more tis-sue.

How Much Radiation?

A dose of 500 r will usually killa man. 250 r will give most peopleradiation sickness; some would die.These dosages apply to radiation ofthe entire body over a short periodof time. The same amount of radia-tion given in small doses over a longperiod of time would probably notkill, indicating that the body hassome ability to recuperate. How-ever, damage will be sustained, andsince radiation has a tendency toadd up cumulatively, painful injurymay show up years later. Life spanis certainly shortened, about oneweek for every 2 or 3 r of exposure.Among the more radiation sensitiveparts of the body are the sex organs,bone marrow and white cells in theblood.

The body can withstand muchlarger doses when applied to a lim-ited area. For example, it is notunusual in the treatment of localizedcancer to employ X-ray or radio-active cobalt radiation levels in ex-cess of 3000 r. Such irradiationcauses some damage, but the bene-fits are thought to outweigh them.

ELECTRONIC TECHNICIAN September, 195830

Television X -RaysAnd Radiation From TV Picture Tubes.

Yes, radiation can either cause orcure cancer.

What is "safe" radiation? Expertopinions differ, but the generalagreement appears to be 0.3 r /weekor about 15 r/year. Some years ago,before new knowledge was uncov-ered, higher limits were thought tobe safe.

With an eye on the long-termeffects, radiologists have set outlimits for accumulated dosages overa lifetime. Up to 28 years, 50 r issuggested; up to 38 years, 100 r; upto 48, 150 r; up to 58, 200 r. Thismeans the 15 r/yr. limit is not rec-ommended for exposure every year.

Typical radiation received by a28 -year old from normal backgroundsources, such as cosmic rays fromouter space, runs about 5 r, or aboutone -tenth of the suggested limit.However, this is just a start. A chestX-ray on film might be about 0.1 r,a fluoroscope 1 r, though an improp-erly operating machine often pro-duces a 100 r dose. Dental X-raysoften fall in the 2r to 8r range perphoto. While these exposures arelocalized, and consequently not asdangerous as whole -body exposuresfor which the limits are prescribed,they still merit serious attention.

In addition, we must consider theincrease in background radiationfrom bomb test fallout. Also, radio-active fallout particles which enterthe body through food and waterraise the body's dosage still further.We have not reached a truly dan-gerous fallout level yet, but we cansee that scientists' concern for thefuture has a reasonable basis.

Radiation from TVWhen an electron beam strikes

the screen of a cathode-ray tube,X-rays are produced. Fortunately,the level is so low that the dosereceived by a typical home vieweris negligible. For the technician whoworks with TV sets day in and dayout, there is still no hazard . . . butthe dosage is no longer infinitesimal.

Tests indicate that a picture tubeoperating at 17 kv gives off less than


0.02 mr/hr. of soft (less penetrat-ing) X-rays, at a distance of 2.5inches from the faceplate.

X-ray radiation follows the squarelaw similar to light intensity. Thatis, double the distance is one-fourththe intensity. Furthermore, thesafety plate can cut radiation downby as much as a factor of about 5.So even an ardent viewer whowatches 1000 hours/year from adistance of a little over 6 ft. awaywould receive only about 0.004 mr/yr. That is negligible, and with lowersecond anode voltages than 17 kv,radiation is still less.

However, though small, it is nolonger negligible for a technicianwho averages 11/2 to 2 ft. away fromtwo operating sets without safetyglass, 40 hours/week, 50 weeks/yr.

The radiation dosage would then beabout 0.8 mr/yr.

Tests on 25 kv color tubes showsoft X-ray radiation (hard X-raysare produced in the 50 kv range) of0.03 mr/hr., 2.5 in. from the tube,with safety glass in place. Thiswould indicate around 0.15 mr/hr.without the glass, or seven to eighttimes more potency than black -and-white tubes. Under equivalent timeand distance conditions as notedabove, technicians would receive 6


Servicing 110

Vertical Sweep CircuitsCircuit Modifications Improve Efficiency And Stability.

Minimum Additional Components Used To Obtain Increased Drive.

JESSE DINES

The 110° CRT is part of a con-tinuing chain of events which ischanging both the physical and elec-trical character of the modern TVset. As streamlining goes hand -in -hand with higher speeds, and smallerTV cabinets go with the wider angledeflection tubes, so must some of theelectrical circuits be modified tokeep in step with some of thechanges.

The vertical sweep system is noexception and enough new featureshave been incorporated to warrantthe technician's attention. At firstglance there appears to be no dif-ference in the vertical circuits usedin some of the newer sets. In spiteof the fact that a 110° yoke producesa greater and more concentrated

magnetic field, it requires about 20%more current than its 90° cousin.

One of the later types of verticalsweep circuits for a 110° CRT isshown in Fig. 1. This circuit isunique in that it employs two ther-mistors for the purpose of maintain-ing constant raster height and fre-quency stability as the set warms up.The use of thermistors in this circuitis probably the beginning of a newtrend in TV receiver design. Someother differences to be found includea vertical output autotransformer,having a primary winding resistanceof only 200 ohms instead of the usual500 to 2,000 ohms. A factor not readi-ly detected from an examination ofthe schematic is circuit efficiency. Itis sometimes more economical to im-prove efficiency than it is to increasethe size of the power supply. Oftenit is necessary to do both. Except forthe yoke, and thermistors, a visual

Fig. 1-Except for thermistors R320 and R323, which stabilize heightand oscillator variations, this 110 vertical sweep circuit is conventional.

0- - 1226

=RN_ "*.E. :17

471PM 200

VERTICAL RETRACEPLATE -

my..3o,

0rR311410

FROM SYNC

SEPARATORNO NOISE

GATE

13131.2

C311 EG.

.022

V111

IODE7VERT OSC

77 35v Pr

VERTICAL RETRACE BLANKING

1 0313.047

1315 C

R317VERT 10_0

1.5 MEG

%37_t_

8J?

T xsi.s g'17$330 S MEG 8321

2100

10677VERT OUTPUT

R030A

83205000

R313VERT.LINI MEG.

0

1311716x

8521

r8=' -s250 1 2208

"- C311 I

oti 22 I

r

63252

13262200

T

s-+220V

0322NEIGHT2.5 MEG

83231 MEG

DEFLECTIONYOKE

BO O1

inspection of the components in thevertical section will reveal no dif-ferences. The 110° yoke is con-spicuous by its very wide flare, andits smaller opening. The wide flareis necessary to permit the yoke to bepositioned over the center of the de-flection point, which is furtherforward, as shown in Fig. 2. Notehow the core material is shaped tofollow the contour of the CRT. Finalcentering adjustments are accom-plished by a magnetized retainingband, or other arrangement of mag-nets.

Before going into a discussion ofhow the thermistors function, theoperation of the multivibrator cir-cuit should be understood. Fig. 3 isa simplified version of this circuit.The 10DE7 dual, but dissimilar tri-ode tube is used as a plate -coupledmultivibrator, and drives the vertical


Fig. 2-Core material and windings aresi.nped to follow the 110 CRT contour. Nar-row neck hel?s concentrate magnetic fields.

ION -TRAPMAGNET

"W -WINDING

CORE MATERIAL

CORE MATERIAL

WINDING


Corner

Difficult Service Jobs Described by Readers

Saturated FlybackA Raytheon TV set, model C2138,

came up with the bends. Horizontalpulling-to be more technical. In-vestigation showed that the bendsoccurred only when the brightnessand contrast controls were setslightly higher than normal. This isa fairly common characteristic insets not equipped with keyed agc,except that the brightness control isusually not involved.

The signal at the video detectorwas normal. The 6AL5 horizontalphase detector tube was removedfrom its socket and the hold controlmanipulated to obtain a stationarypicture. The bend was still present.This eliminated the sync circuits asthe cause of the complaint and indi-cated trouble beyond the horizontalafc circuit. The scope showed un-wanted video signal at the plate ofthe horizontal oscillator tube, butnot at the grid. It was now evidentthat the oscillator was being modu-lated by video information, buthow? B+ was clean, there was novideo signal in the power supply,and the afc and sync circuits wereisolated when the 6AL5 was pulled.A careful examination of the chassisfollowed. The common ground onthe brightness and horizontal holdcontrols were checked, terminalstrips were examined for leakage,the chassis was examined for strayvideo pickup, leads were dressed andredressed, tube shields were in-stalled-all to no avail.

I now decided to prove conclus-

TOUGH DOGS WANTED!$10 for acceptable Items. Use drawings to illus-trate whenever necessary. A rough sketch will do.Photos are desirable. Unacceptable items will bereturned. Send your entries to "Tough Dogs" Edi-tor, ELECTRONIC TECHNICIAN, 480 Lexington Ave.,New York 17, N. Y.

HORIZOSCILLATOR

12AU7 .00I5pf

47

ively that the fault was in the oscil-lator circuit. To do this I discon-nected the grid of the output tubeand connected an external saw -tooth oscillator to it. With this sub-stitute oscillator there was no bend.This was proof. I now checked forvideo signal in the output stage, ex-pecting it to be absent. It was stillthere.

The video signal was present inthe output transformer and was fedback to the oscillator phase detectorcircuits by way of the lines con-nected to pins 7 and 9 on the flyback.

The video signal appeared in theoutput transformer because of poorregulation. With a high brightnesscontrol setting, more current isdrawn through the high voltagetransformer. Also when a brightscene is scanned the current in-creases still further. Conversely adark scene will cause less currentto flow. Because these variations

which are actually an image of thevideo signal, appeared in the outputtransformer, either by transformeraction or core saturation, the signalwas reflected back to the horizontaloscillator. Of the two most likelycauses, saturation is suspect becausethis condition would become moreaggravated as the brightness controlwas advanced. This could occur inthe nonlinear or knee portion of thepermeability curve for the trans-former. In this area small changes incurrent can cause large changes ininductance.

The output transformer was ex-amined and appeared to be in goodcondition. It checked good on a "Q"type tester. I decided this was aninherent design problem. Additionalfiltering in the anode supply, asshown, was tried and it correctedthe trouble.-Ivan White, Albuquer-que, N. M.

Video signal modulated high voltage supply and caused crosstalk with horizontal sync.

HORIZOUTPUT

25BQ6

PHASE DETECTOR

2nd/I MEG \\ ANODE

DAMPER12500J.JJJfI - ,

YOKE PARTSADDED


Integrated Test Equipment

VICTOR ROBINSONCHIEF ENGINEER

PRECISION APPARATUS CO. INC.

Time is one of the most importantfactors in the successful operationof a TV service business. The ob-vious need for speed in processingrepair jobs often leads the techni-cian to overlook certain qualityaspects of the business, which canlead to long-term customer confi-dence. Localizing trouble, replacingcomponents and placing an inopera-tive set back into working conditionis obviously basic. However, a smallamount of additional time spent inchecking the overall response curveof a repaired set does yield divi-dends. For example, one shop affixesthe following printed tag to eachshop -serviced set:

"This TV set has not only beenrestored to normal operating con-dition through component replace-ment and/or repair methods detailed

Fast and Simplified Sweep Alignment

on your service bill, but has beenfurther checked by oscillographicmeans for conformance with align-ment standards prescribed by themanufacturer of your set. This time-consuming testing procedure, per-formed with special test instrumentsis intended to extract the maximumpicture clarity and sound reproduc-tion from your set. This special serv-ice is performed at no extra -chargeand is a part of our desire to estab-lish a long-term relationship withyou, based upon genuine service andhigh quality workmanship."

This type of approach can helpthe customer appreciate that his setreceived the necessary attention.

In order for this procedure to beaccepted and become routine, it isnecessary that it be rapid, straight-forward, and fairly easy to perform.One nice part of this activity isthat the more often a technicianuses it, the less time it takes andthe better is his understanding ofthe principles involved. Some experttechnicians particularly those whowork on the same type of a set allthe time, are so familiar with theprocedure, that they can completelyalign a set in a matter of minutes. It

Fig. 1-Sweep alignment test equipment mounted above the bench, interconnected, and readyfor use. Only two cables and the bias box are connected to the set. The marker adder cansuperimpose wider or narrower, and larger or smaller markers on the response curve withoutloading the receiver.

SWEEPGENERATOR

I

0 0 00

FLOATINGMIXERTUBE

SHIELD

MARKERGENERATOR

MARKER RECOVERSWEEPINPUT INPUADDER RESPONSE

T

a

TV SETVIDEO

DETEC1OROUTPUT

AGCBUS

MARKERINPUT

.1/1

OSCILLOSCOPE

4V OH

d

OUTPUTTO 'SCOPE

BIAS BOX

is quite interesting to watch themadjust the top and bottom slugs ofan i-f transformer at the same time,using one adjusting tool in eachhand.

For fast checks of the responsecurve using the sweep -alignmenttechnique, sweep generator, markergenerator, oscilloscope and otheraccessories such as probes, markeradder and bias box should be read-ily accessible. A permanent well-rounded grouping of these instru-ments, (preferably on an above -the -bench shelving arrangement)helps to facilitate connection of theequipment to the chassis. Intercon-nections between instruments canbe left intact, and thus further speedup the procedure. In a typical setup, Fig. 1, it is only necessary toattach the input and output leadsfrom the equipment and the leadsfrom the bias box to the TV set.

Marker

In the past, one of the difficultiesthe technician had to contend withwas the marker pip. Before themarker adder came along it wasnecessary to feed the marker signalin with the sweep signal. Becauseboth signals passed through the re-ceiver, extra precautions to avoidoverloading had to be observed. Tokeep the marker generator fromloading down the circuit, its leadswere loosely coupled to the receivereither by clipping onto the insulatedportion of the sweep generator'sleads, or to the chassis. While thissimple injection method kept thedistortion of the response curvereasonably low, the amplitude andresultant visibility of the markerwas not particularly large. The mostserious objection to this method isthe fact that the marker signalvaries in visibility at different pointson the response curve. The ampli-tude of the marker is dependentupon the instantaneous amplitude ofthe response curve. As the responsecurve approaches the baseline, less


Speeds TV AlignmentTechnique Can Become Routine.

Fig. 2-Normal video i-f response curveshowing proper bandwidth and location ofvideo and audio markers.

and less swept signal is available tobeat with the marker signal, andthe marker becomes smaller andsmaller until finally it disappears.

Low marker amplitude and ab-sence of markers at important checkpoints such as trap and discrimi-nator midpoints are serious detri-ments to fast alignment techniques.In addition, spurious markers gen-erated by multiple signals from thesweep generator are sometimes dif-ficult to distinguish from the correctmarker pip. These marker -identifi-cation problems have discouragedsome technicians from successfullyapplying the sweep -alignment tech-nique. The marker adder injectionmethod simplifies matters consider-ably. It adds the marker signal tothe response curve after it haspassed through the set. Because themarker is not fed through the re-ceiver, its size is not dependent uponthe set's varying response nor canit overload the receiver and distortits response curve.

I -F Response

Initially it is better to take a quicklook at the i-f section first. This isone way to isolate tuner difficultiesand it is easy enough to switch theinput leads to include the tuner re-sponse after the i-fs have beenchecked. To sweep check the re-sponse of the video i-fs, couple theoutput of the sweep generator to theTV set mixer and ground, or the in-jection point recommended by theset manufacturer. A floating tube

shield on the mixer tube will do inmost cases. The output of the videosecond detector is fed to the scopethrough the marker adder. AGCover -ride should be applied in ac-cordance with the set maker's rec-ommendations, to simulate i-f am-plifier sensitivity under signalconditions. Some sets may requirethe application of more than onevoltage. Some bias boxes do supplyseveral voltage outlets, and thusmake it unnecessary to use morethan one such unit. This procedureapplies even in those setups wherea marker adder is not used. In theabsence of a marker adder, it willbe necessary to use a proper de -

Fig. 3-Reduced bandwidth and increasedgain may be desirable in fringe areas. Littleor no picture deterioration can be noticed.

coupling network between the re-ceiver and the scope.

The output of the sweep generatorshould be advanced until obviousflattening and distortion occurs, andthen reduced until the level is safe-ly below the overload point. All thecables should be checked and movedaround a bit to make sure that theshape of the response curve doesnot vary. If it does, it is an indica-tion that distortion created by stand-ing waves and insufficient equip-ment grounding, exists. Metallicbench plates are quite helpful ininsuring good ground conditions. Itis good practice as well as a safetyfactor for personnel and equipmentto use an isolation transformer. Byvarying the marker generator fre-quency and noting the markers, the

Cr"The Technician Who Needs

I I ---Equipment... Is

PAYING FOR IT I "

response curve's frequency andbandwidth become quickly andclearly evident.

Fig. 2 shows a normal video i-fresponse curve; bandwidth is good,and video and audio markers are intheir normal position. Fig. 3 indi-cates a somewhat narrower band-width, but the sound and picturemarkers are still properly oriented.Deterioration in picture quality isvery slight and probably not notice-able. Reduced bandwidth usually re-sults in increased gain, which may bedesirable in fringe areas. Fig. 4 illus-trates an excessively narrow band-width condition, which will showup as a noticeable lack of fine detailin the picture. Increased bandwidthand low gain is shown in Fig. 5.Other abnormal conditions of mis-adjusted traps, sound and video notproperly positioned on the responsecurve, regeneration, etc., are easilyand quickly detected.

For the benefit of this rapid align-ment procedure it is not necessaryto obtain perfect realignment. Inmany cases a 20% or 30% tilt isquite acceptable. If a reasonablynormal shaped curve having properposition of video and sound mark-ers is obtained, satisfactory resultscan be expected. If the waveform isapproximately correct, and if it isdesirable to improve its shape, the


Fig. 4-Sharply reduced bandwidth showsup as a loss of fine detail in the picture.


Improve Your Skills By

Building a Technical Library

HOME AIR CONDITIONINGINSTALLATION & REPAIR

By J. Derman, F. Makstein & H. SeamanBoth theory and practical constructiondesigns are examined, along with mainte-nance techniques and procedure for de-termining size of air conditioner required.Covers motors, compressors, condensers,evaporators, regulating valves, circuitsand other system elements. Soft cover,160 pages. Price $3.50.

INDUSTRIAL CONTROLCIRCUITS

By Sidney Platt. Excellent starting poinfor TV technician interested in learningabout industrial electronics. Non -mathe-matical text explains circuitry and op-eration of power controls, relays, timers.photoelectric devices and instrumentationfound in factories. Practical applicationsshown. Soft cover, 200 pages. Price $3.90.

REPAIRING HI -Fl SYSTEMS

By David Fidehnan. How to find andcorrect troubles in hi-fi equipment witheither little or elaborate test equipment.Among the many subjects covered areservicmg amplifiers, preamps, tunerstape recorders, changers, pickups andspeakers. Construction and custom in-stallations are discussed. Soft cover, 212pages. Price $3.90.

* PORTABLE AND CLOCKRADIOS

By Ben Crisses & David Gnessin. Writtenfrom a practical viewpoint with theorykept to a minimum, this practical volumeemphasizes repair, design, replacements,alignment, current drain and related cir-cuit problems. Dial stringing, clock mech-anisms and transistorized circuits arecovered. Soft cover, 128 pages. Price $2.75.

BASIC TELEVISION (5 vols.)By Alex Schure. This five-volume "pic-ture book" course on all aspects of TVis illustrated in a personalized way tomake all concepts easily understood.Theory and performance of the transmit-ter, receiver, antennas, circuits, etc., areexplained. Contains more than 700 illus-trations. Soft cover, 5 vols., 688 pages.Price $10.00/set.

* BASICS OF DIGITALCOMPUTERS (3 vols.)

By John S. Murphy. Using the easy -to -learn picture book technique, these threevolumes explain the theory and functionsof digital computers. Very little mathe-matics. Covers counting systems, com-puter language, programming, memories,logic diagrams, flip-flops, clamping, input-output and data processing. Soft cover,416 pages. $6.95/set.

HOW TO INSTALL & SERVICEAUTO RADIOS

By Jack Darr. Entire text is slanted fromthe practical viewpoint on overcomingthe problems in maintaining and in-stalling auto radios. Included are discus-sions on antennas, noise elimination,speakers, remote heads, intermittentsparts replacement, realignment, tuners,instruments and tools. Soft cover, 128pages. Price $1.80

RADIO OPERATOR'S LICENSEQ & A MANUAL

By Milton Kaufman. This sixth editiongives you the information you need topass FCC license examinations. In ques-tion and answer form similar to actualFCC tests, all eight elements are covered,including law, radiotelephone, radiotele-graph, aircraft and ship radar. Abbrevia-tions, code, etc. included. Hard cover,736 pages. Price $6.60

HOW TO SERVICETAPE RECORDERS

By C. A. Tuthill. Starting with basicmagnetic principles, the text goes throughthe recording operation, recorder mecha-nisms and circuitry. In addition to anexplanation of the functions of the var-ious recorder elements, the techniquesfor repairing various troubles and mak-ing tests are presented. Soft cover, 160pages. Price $2.90.

* ELECTRONIC MUSICALINSTRUMENT MANUAL

By Alan Douglas. This third edition guideto the theory, operation and design ofelectronic organs and related equipmentgoes into detailed description of musicalwaveforms, music producing circuits,sound generators, and operating controls.Complete diagrams are given for variouscommercial units. Hard cover, 254 pages.$7.50.

STEREOPHONIC SOUNDBy Norman Crowhurst. This first assess-ment of the new stereo techniques sweep-ing the hi-fi field starts with the basicsof binaural listening, and then concen-trates on actual systems. Subjectsinclude radio, disc, tape, recording pro-cedure, speaker placement, system con-struction and theatre systems. Soft cover,128 pages. Price $2.25.

REPAIRING RECORDCHANGERS

By Eugene Ecklund. This practical man-ual on the repair of record changer,covers mechanical elements, such asdrives, tripping and dropping mecha-nisms, change actions and spindles. Italso explains pickups, needles and mo-tors. Amplification compensation, faultlocation and tests are included. Hardcover, 278 pages. Price $5.95.

ELECTRONICS IN INDUSTRYBy George Chute. How various electronicdevices operate, and how they are em-ployed in industry is clearly explainedwith little use of mathematics. Subjectmatter includes rectifiers, time delays,gas tubes, welding controls, ignitions,heat and light relays, thyratrons, motors,servos and others. Hard cover, 431 pages.Price $8.00.

*OBTAINING & INTERPRET-ING TEST SCOPE TRACES

By John F. Rider. This handbook showshow to get the most out of your oscil-loscope. Over 800 traces are shown, in-cluding sine, square, rectangular, trape-zoid, sawtooth differentiated and inte-grated types. Explains scope connections,manipulating controls and test setups.Soft cover, 190 pages. Price $2.40.

SMALL APPLIANCE SERVICINGBy P. T. Brockwell, Jr. This volume give,you professional small appliance servic-ing techniques and business procedures.Illustrated instructions tell how to testunits. Covers irons, toasters, mixers,roasters, coffee makers, waffle irons, ro-tisseries and others. A profitable sidelinefor TV technicians. Hard cover, 180 pages.Price $4.50.


ELECTRONIC TECHNICIAN editors have carefully selectedthese books by the world's leading technical publishers.Order direct from our Book Department. Fill in coupon or sep-arate sheet. Money -back guarantee.

* denotes book listed here for the first time.

HiFi

O

TRANSISTORS IN RADIOAND TELEVISION

By Milton Kiver. With transistorized re-ceivers becoming increasingly important,technicians should find interest in thisdescriptive treatment of both point con-tact and junction types. Circuits describedinclude both amplifiers and oscillators.Servicing, experiments and characteris-tics are discussed. Hard cover, 340 pages.Price $7.00

HOW TO RUN ASMALL BUSINESS

By J. K. Lasser. Here is a basic businessguidebook for service dealers and otheroperators of retail and small manufactur-ing firms. Covers record keeping, avoid-ing frauds, tax management, credit sales,insurance programs, how to buy an estab-lished busmess, financing and other im-portant topics. Hard cover, 400 pages.Price $4.95.

HANDBOOK OF BASICCIRCUITS, TV, FM, AM

By Matthew Mandl. The schematics andfunctions of 136 carefully selected circuitsfound in home and industrial electronicproducts are analyzed. AVC bridges,AGC, dampers, sawtooth, discriminators,limiters, splitter, sync stretchers, multi -vibrators and doublers are among themany important ones presented. Hardcover, 365 pages. Price $7.50

MANDL'S TELEVISIONSERVICING

By Matthew Mandl. Extensive coverageof TV circuit functions and troubleshoot-ing procedures makes this a practicalreference. Trouble index relates symp-toms and probable cause to text. Anten-nas, transmission lines, use of test in-struments, UHF and color TV areincluded, as well as b&w TV stages. Hardcover, 460 pages. Price $6.50.

CLOSED CIRCUIT ANDINDUSTRIAL TELEVISION

By Edward Noll. The technical and busi-ness aspects of closed circuit systems areexplained in detail. Commercial equip-ment is described, along with construc-tion information. Scanning process, pic-ture transmission, camera tubes and cir-cuits, video amplifiers, sync, adjustmentsand optics are explained. Soft cover, 230pages. Price $4.95.

* PINPOINT COLOR TVTROUBLES IN 15 MINUTES

By Harold P. Manly. This practical trou-bleshooting book covers 150 types offaulty pictures with over 1000 troubles.The "check -chart" system points up pos-sible troubles. Circuits explained in-clude i-f, age, detector, luminance,chrominance, subcarrier, sync and others.Plastic spiral bound. Soft cover, 548 pages.Price $5.95.

ELEMENTS OF MAGNETICTAPE RECORDING

By N. M. Haynes. The complete scope oftape recording is extensively discussed,including fundamentals, nomenclature,apparatus and repair techniques. Topicsinclude tape -handling mechanisms, bat-tery operation, bias, erase, record, mon-itoring, mixing, editing and unsual tapephenomena. Hard cover, 404 pages. Price$7.95.

Also See New Books On Page 21.

FREE!!STATION LISTINGS BOOK

With every book order for $7.50or more, you will be sent-with-out charge-a copy of the 64 -pagereference book, "Jones NorthAmerican AM -FM -Radio -TV Sta-tion Listings." It lists over 5000stations from official FCC infor-mation. Covers the United Statesand possessions, Canada, Cuba,Mexico and West Indies. Stationsare cross-referenced by geo-graphic location, by frequency,and by call letters. Lists AM andTV network affiliations and AMoperating power. A wealth ofbroadcasting information!

CUT HERE

ELECTRONIC TECHNICIAN Book Dept.480 Lexington AvenueNew York 17, N.Y.

I plan to build my technical library. Please send me the books I have indicatedbelow. You will pay postage. I understand that if I am not satisfied with any bookfor any reason, I may return it to you prepaid in good, clean condition within7 days of receipt and receive a complete refund. If my order is for $7.50 or more, Iwill receive a free copy of the Station Listings Book.Enclosed is my check or money order, in full payment, made out to ELECTRONICTECHNICIAN.

_Industrial Control Circuits .. . @ $ 3.90 Electronics in Industry @ $ 8.00Home Air Conditioning _Obtaining and Interpreting

Installation & Repair @ $ 3.50 Test Scope Traces @ $ 2.40Repairing Hi-Fi Systems @ $ 3.93 Small Appliance Servicing . @ $ 4.50Portable and Clock Radios @ $ 2.75 Transistors in Radio

__Basic Television @ $10.00 and Television @ $ 7.00Basics of Digital Computers . @ $ 6.95 _How to Run a Small Business @ $ 4.95How to Install and Service _Handbook of Basic

Auto Radios @ $ 1.80 Circuits, TV, FM, AM .... @ $ 7.50_Radio Operator's License Mandl's Television Servicing . @ $ 6.50

O & A Manual @ $ 6.60 _Closed Circuit andHow to Service Tape Recorders @ $ 2.90 Industrial Television @ $ 4.95

_Electronic Musical Pinpoint Color TV TroublesInstrument Manual @ $ 7.50 in 15 Minutes @ $ 5.95

Stereophonic Sound @ $ 2.25 Elements of MagneticRepairing Record Changers @ $ 5.95 Tape Recording @ $ 7.95

Enclosed is total payment of $(New York City residents add 3% sales tax)

Name

Address

City Zone State

Tips for Home and Bench Service

Yoke SupportThe problem was to make the

yoke stay firm against the bell ofthe 8XP/8YP test CRT. I solved itby devising a neck stock block. Thedevice is made out of a piece offairly hard wood about 4" squareand 1" wide. Find the center of the4" square face and drill a hole slight-ly smaller than the test tube neckdiameter. Then cut from side to sideand through the center of the holeas shown. Mount a 1" hinge so thatthe device can be opened and closed.Fasten two 1" angles on the side op-posite the hinge. Tighten the upperangle but not the lower one. Thelower angle should be free to rotatearound its mounting screw. Before

Stock block supports yoke on test CRT.

mounting the top angle, cut a slotfrom the hole to one of its sides.Insert a 6-32 machine screw throughthe bottom angle and lock it with anut.

Add a wing nut, and line theopening with a piece of felt or cloth.The wing nut can be loosened andswung aside to open the block. Theblock can then be mounted aroundthe neck of the tube. Use commonsense when tightening the wing nut.Excessive pressure can do damage.If it appears to be too hazardous, arubber band slipped over the anglescan be used instead.-Paul Katz,Bayonne, N. J.

VERTICALOSCILLATOR

VERTICALOUTPUT

RC network eliminates vertical compression.

Vertical CompressionThe following is a solution to a

problem which we have repeatedlyencountered in two brands of re-ceivers: Crosley, chassis 431, 434,466-7, and Hallicrafter chassis18050D, 1900D, A -B -C 2000D. Thefault consists of a pronounced com-pression in the upper half of thevertical sweep. It appears as a brightbar across the raster. These TV re-ceivers use a dual triode in a di-rectly coupled vertical blockingoscillator and output circuit.

One manufacturer has a servicenote stating that on their receiversthere is a jumper across a 68,000ohm resistor between points A andB and that if a squeeze is encoun-tered the direct connection shouldbe opened. We have yet to see thisresistor on any chassis.

Our modification is fully effectiveand quite simple to make. It con-sists of opening the grounded sideof capacitor Cl and adding a resistorand capacitor, as shown in thedotted area.-Ralph E. Davis, Co-hutta, Ga.

Cartridge RemovalStereo Record Changer

For easy access to the cartridge,remove the tone arm assembly fromits mounting. It is clamped to the

vertical shaft of the trip lever. Byloosening the clamping screw, thewhole arm assembly may be liftedupward and off the trip lever shaft.It is then an easy matter to replaceeither the stylus or the cartridge.

When reassembling the arm to theshaft, it is necessary to position thearm so that the stylus will land atthe correct distance in from the edgeof the record. A locating hole in thevertical shaft of the trip lever en-

Loosen clamp screw to remove pick-up arm.

ables the arm assembly to be selfpositioned for correct landing. It isonly necessary that the arm be inthe approximate correct position,tightening the clamp screw will thenbring it to the correct position.Tighten the clamp screw securelyand put the mechanism through sev-eral complete cycles while checkinglanding position. An adjusting screwat the side of the arm permits fineadjustment of the set -down position.

The pickup cable at the back ofthe arm should be dressed so thatthere is no restriction in arm move-ment.-RCA Service Co., Camden,N.J.

l.' -10P HINTS WANTED!

$3 to $10 for acceptable items. Use drawings toillustrate whenever necessary, A rough sketch willdo. Photos are desirable. Unacceptable items willbe returned. Send your entries to "Shop Hints"Editor, ELECTRONIC TECHNICIAN, 480 LexingtonAve., New York 17, N. Y.


FREE LITERATURETo receive the literature below without charge, simply circle the numbers on the coupon

corresponding to the items of interest. Cut out and mail to ELECTRONIC TECHNICIAN.

1 FM Antennas: A new brochurecovers the 114-008 inline type and

114-010 turnstile FM antennas. Fulldescriptions, illustrations, diagramsand prices are included. (1B9: Am -phenol Electronics Corp.)

2 Hi-Fi Volume Control: A revisededition of the booklet on the

Compentrol is available. This con-trol is designed as a replacement forvolume controls on radio, TV,phonographs, etc. 20 pages fully il-lustrated. Includes installation in-structions. (2B9: Centralab Div.)

3TV/FM Set Couplers: The Wizard300 TV/FM set coupler is cov-

ered in an illustrated circular. 2 or20 sets can be operated from oneantenna, without amplification.Gives clear reception on all chan-nels, and there is no interferencebetween sets. (3B9: Charles Engi-neering, Inc.)

4Auto -Radio Transformers: A 16-page guide lists replacements for

over 400 models of 37 manufacturers.Includes a special section on tran-sistorized auto radios. Listed by autoand radio manufacturer and by yearof use. Transformer replacementdata for vibrator, audio, driver andinterstage transformers are pre-sented. (4B9: Chicago StandardTransformer Corp.)

5Capacitors: A twist -prong capaci-tor guide has just been released.

52 pages listing over 3,300 manufac-turer's part numbers, ratings andsizes for twist -prong replacementcapacitors used by 97 TV set makers.(5B9: Cornell-Dubilier ElectricCorp.)

6Phono Needles: Two leaflets areavailable. One of these illustrates

42 cartridges and gives a key whichmakes it easy to select the rightneedle. Includes a cross-reference

I. Circle numbers of free literature desired.

2. For more data on new products and bulletins,described in this issue, write in ELECTRONICTECHNICIAN code number found at end of eachitem.

3. Fill in name and address. Mail to ELECTRONICTECHNICIAN, 480 Lexington Ave., New York 17,N. Y.

list of manufacturers. The other is adigest of information such as whyneedles wear, how you can tell whena needle is worn, and which type ofneedle is the best buy. (6B9: Fideli-tone, Inc.)

7Communication Equipment: Ashort -form catalog covers 35

products, including receivers, con-verters, tuners, amplifiers, adapters,and antennas. Printed in two colors,fully illustrated, this 4 -page cataloggives model numbers, specificationsand prices. (7B9: Gonset Div.)

8Kits: Hi-Fi, Test, Marine andother electronic instruments, in

kit form, are covered in a new 60 -page catalog. Specifications, sche-matics, illustrations, detailed infor-mation and prices are included.More than 100 electronic instru-ments in kit form are described.(8B9: Heath Co.)

9Two-Way Radio: A colorful, 4-page circular describes and illus-

trates the Expeditor, designed as alow-cost, efficient, two-way radiocommunication. With a basic rangeof 10 miles, addition of one unit asa repeater will give a range as faras the antenna can "see." Another4 -pager covers model 249, describedas the only radiotelephone built forthe outboard, with transistorizedpower supply. (9B9 Kaar Engineer-ing Corp.)

1 (Vest Equipment: A new 12 -pageI wtwo-color, illustrated catalog

provides detailed descriptions ofthree models of absorption analyzersand accessories. Covers equipmentincorporating the electrostatic pick-up for waveform analysis of circuits

having periodic wave forms between3mc and 240mc. Also included areother test instruments. All units'specifications and prices are given.(10B9: Kingston Electronic Corp.)

11Antenna Comparator: New lit-erature fully describes the Com-

parator, a new concept and equip-ment permitting a direct comparison,on the customer's TV screen, be-tween the customer's antenna anda new one. Mast and switching setupare quickly rigged. Outlines of freeantenna sales materials available in-cluded. (11B9: Technical ApplianceCorp.)

pStereo Speakers: A 6 -page,three -color circular illustrates

and describes three series of stereospeakers: Unidrive, Continental, andFabulous "G." Specifications andprices are included. (12B9: UtahRadio & Electronic Corp.)

131 'rape System Components: AI 4Fnew 16 -page catalog covers tapedecks and related record/playbackcomponents, with full descriptions,illustrations and diagrams. Featuredare new models, fitted with thefirm's new laminated quarter -trackhead. Included is a complete list ofreplaceable parts for all of the firm'sprevious components. (13B9: Vik-ing.)

1ASoldering Irons: A two-color

'catalog sheet gives full details,illustrations and prices of the newMagnastat soldering irons with built-in temperature control. Features in-clude: precise temperature at thetip and small size. (14B9: WellerElectric Corp.)

CUT HERE

This coupon must be used before October 15, 1958

1. Circle free literature numbers. 1 2 3 4 5 6 7 8 9 10 11 12 13 14

2. For more data on new products and bulletins write in code numbers

3. Fill in your name and address. Mail promptly.

Name

Position Firm

Address

City Zone State

SERVICE DEALERS

HI-FI SPECIALISTS!

STEREO1959

To help promote your stereo sales and installations,ELECTRONIC TECHNICIAN will make available to youextra copies of the following 60 -page section-STEREO1959-at nominal cost.

You may either sell this section-nationally advertised at500 per copy-or give it away to your customers as agoodwill gesture. STEREO 1959 shows your customers thebenefits and requirements of stereo, plus the wide choiceof available components. You can then sell and/or installthe equipment your customers want.

Become the Hi-Fi Stereo Sales & Service Center in yourcommunity. Send your order for extra copies of STEREO1959, along with payment, to ELECTRONIC TECHNICIAN,Dept. Stereo -T, 480 Lexington Avenue, New York 17, N. Y.

PRICES (to the trade only):Single copies 20a each

10 to 49 12a each50 to 99 1 la each

100 to 499 100 each500 to 999 9a each

1000 and over 8a each

ASS,XI \ IF

NA \

1

/NC


STEREO1959

TECHNICAL ARTICLES

Stereo Discs Cartridges Needles

Stereocasting FM/AM Multiplex

Speakers Changers Turntables

Tape Recorders Master Control

Converting to Stereo Glossary

PRODUCT CATALOG

Photographs of Equipment Prices

Technical Specifications

DIRECTORY OF MANUFACTURERS

Names Addresses Products

Published by ELECTRONIC TECHNICIAN Magazine

The latest high fidelity developments from Rek-O-Kut Co., Inc., 38.19 108th St., Corona 68, N. Y.

TURNTABLE NEED IN STEREO MET BY NEW RONDINES!Expanded Rek-O-Kut Line Covers All Levels of Consumer

Demand - New Low Prices Start at $39.95.

Single -Speed in Kit Form-$39.95

SPECIFICATIONS Model K-33

Assembly Time: Approximately 30minutes with simple tools. Mount-ing template suppliedNoise Level: 47 db.Motor: Induction-4-pole-built toRek-O-Kut specifications.Speed: 331/3 rpm.Belt: Special endless woven fabricwith thickness held to ± .001.Adjustment for belt tension.Built -In Strobe Disc: For checkingspeed.Minimum Dimensions For CabinetInstallation With Rek-O-Kut S-120Arm: 173/4 x 16%.Turntable: Tapered for easy dischandling. Solid cast aluminumlathe -turned.

3 -speed Hysteresis

Synchronous Motor-$99.95

SPECIFICATIONSModel B-12GH

Noise Level: 53 db.Motor: New design, self-lubricating, Hysteresis Synchronous.Speeds: 331/3, 45 and 78 rpm.Speed Selection: Single selector knob. Idler is disengaged in"off" position.Built -In Strobe Disc: For checking speeds.45 RPM Hub: Built-in retractable.Pilot Light: Jewelled neon light acts as "on/off" indicator.Chassis Deck: Cross -ribbed cast aluminum. Designed forflush -mounting in rectangular cut-out.Minimum Dimensions For Cabinet Installation With Rek-O-Kut S-120 Arm: Left to Right 173/4; Front to Back 16"; Heightabove Deck 3"; Height below Deck 61/2".Turntable: Solid cast aluminum-lathe-turned. Tapered foreasy disc handling.

Single -Speed Hysteresis

Synchronous Motor-$69.95

SPECIFICATIONS Model N -33H

Noise Level: 53 db.Motor: New design, self-lubricat-ing, Hysteresis Synchronous withspecial breaking for reduction ofcoasting.Speed: 331/3 rpm.Belt: Special endless woven fabricwith thickness held to -± .001.Adjustment for belt tension.Built -In Strobe Disc: For checkingspeed.Chassis Deck: 157/8 x 15 AluminumMinimum Dimensions For CabinetInstallation With Rek-O-Kut S-120Arm: 173/4 x 163/4.Turntable: Solid Cast Aluminumlathe -turned. Tapered for easy dischandling.

All -New Rondines Offer Matchless Performance- Fashion -Keyed Styling!With the new advanced Rondines,

Rek-O-Kut has again set performancestandards far beyond any consistentattainment by other brands! In addi-tion to great new operational perform-ance and convenience, Rek-O-Kut hasadded fashion -keyed styling with strik-ing designs created by George Nelson,noted industrial designer. The lathe -turned cast -aluminum tables are nowtapered for easy disc handling and thecompact, modern over-all turntabledecor is highlighted by the attractivefinish in black and aluminum.

' ,

The K-33 belt -drive Rondine inkit form answers the tremendous de-mand by the budget -conscious "teen-age," and college groups, as well as the"do-it-yourself" fans. Even with a Rek-O-Kut or Audax Tonearm Kit, the K-33 matches or betters the price of"High Fidelity" changers! Simple as-sembly with ordinary tools can be ac-complished in less than thirty minutes!

Owners and buyers of more elabo-rate stereo component systems will wel-come the advent of the single speedand 3 -speed Rondines with hysteresis

synchronous motors at unprecedentedlow prices. This broad selection is fur-ther widened by the continued avail-ability of the famous Rondine Deluxe(B -12H) with custom hysteresismotor and the ever -popular 2 -speedRondine Juniors (L-34 and L-37).

Ask About the New Rek-O-Kut StereoTonearms - also Stereo ConversionKits for converting A-120 and A-160Arms to Stereo.

WRITE FOR LATEST CATALOG

ENGINEERED FOR THE STUDIO...DESIGNED F 0 R, THE HOMEExport. Morhan Exporting Corp., 458 Broadway, N. Y. 13 Canada: Atlas Radio Corp. 50 Wingold Ave., Toronto 10, Ont.

Circle 42-01 on inquiry form page 7342 ELECTRONIC TECHNICIAN Stereo, 1959

STEREO 1959CONTENTS

Entire STEREO 1959 Contents on Pages 41-100

FEATURES and ARTICLESThe Meaning of Stereo 47Stereo Discs-Two Channels In One Groove 48Master Control for Stereo 50Converting to Stereo 52The Stereo Cartridge 54Needles for Stereo 56Multiplex Stereocasting 60Stereo Tape and Tape Recorders 64Speaker Arrangements for Stereo 66Changers and Turntables for Stereo 71

Readers Inquiry Card 73Stereo Glossary 98

PRODUCT CATALOGAmplifiers & Preamps 75 Microphones 81

Arms 77 Speakers & Enclosures 81

Cartridges 78 Tape Recorders 84

Changers 79 Tuners 85

Control Units & Adapters 80 Turntables 86

Conversion Kits 80

BUYERS DIRECTORYAmplifiers, Preamplifiers & Controls .. 88 Speakers & Cabinets 89Cartridges, Stereo Phone 88 Tape 90Changers, Turntables & Arms 88 Tape Recorders, Playbacks &Conversion Kits 88 Accessories 90Microphones & Accessories 89 Tuners 90Needles, 0.5 or 0.7 Mil 89 Alphabetical List of Manufacturers .. 91

Phonograph Systems 89 Industry Associations 93

Records, Stereo 89

ALBERT J. FORMANEditor

ROBERT CORNELLTechnical Editor

NORMAN CROWHURST B. V. SPINETTA CHARLES DREYERStereo Consultant Directory Editor Art Director

STEREO 1959 is published by ELECTRONIC TECHNICIANMagazine, the leading technical journal of the audio -electronic maintenance field. Printed in U.S.A. 50¢ per copy.

Copyright 1958 by Electronic Technician, Inc.,480 Lexington Avenue, New York 17, N.Y.

HOWARD A. REED, President

OW* 44-9/ tea impede," loan p. 730'

0

ST

with

yS

TE

H0

oST

AN

DA

RD

0.0N

YA

,A

Ster

eo's

Sta

ndar

dUD

C

".61

1141

6460

ette

ttalte

......

.,""t

v.k.

IF T

HIS

TS

- Y

O'P

RE

-SE

NT

"6r'-

PIC

o P

OS

ED

SP

EA

KE

R S

YS

TE

M

cobt

ing

betw

een

\$60

'.$9

'90-

920

cost

ing

betw

een

Incl

udes

an

8" c

oaxi

al s

peak

er s

uch

as:

E -

V C

OR

ON

ET

* (w

ith S

P8B

), N

et $

65E

-V

BA

RO

NE

T*

(with

$P

8B),

Net

$74

.50

SP

8B. W

ide

rang

e, e

cono

mic

al, s

uper

-ef

fi-ci

ent c

oaxi

al s

peak

er. S

mal

l hig

h -f

requ

ency

prop

agat

or in

sure

s fin

e di

sper

sion

.

Incl

udes

a tw

o-w

ay s

epar

ate

syst

em s

uch

as:

E -

V C

OR

ON

ET

IA, N

et $

102

E -

V B

AR

ON

ET

III,

Net

$11

1.50

E -

V R

EG

A T

. IA

, Nat

SI0

3

or in

clud

es a

12"

coa

xial

spe

aker

suc

h as

:E

-V

MA

RQ

UIS

" (w

ith S

P12

B),

Net

$98

E -

V A

RIS

TO

CR

AT

" (w

ith S

PI2

B1,

Net

$10

759

138:

Add

ed e

ffici

ency

with

low

er r

eso-

nonc

e. E

xten

ds fu

ndam

enta

l low

ran

geE

xcel

lent

dis

pers

ion

for

wid

est s

tere

o ef

fect

s.

incl

udes

thre

e-w

ay s

peak

er s

uch

as:

E -

V M

AR

QU

IS*

(with

12T

RX

B),

Net

$12

9E

-V

AR

IST

OC

RA

T (

with

17T

RX

8),

14e,

5130

12T

RX

8: H

as a

ll th

e fe

atur

es o

f the

SP

12B

--pl

us a

sep

arat

e hi

gh -

freq

uenc

y dr

iver

with

elec

tric

al c

ross

over

for

still

low

er d

isto

rtio

n.G

ivw

ides

t spr

ead

of v

ital s

tere

o ra

nge

toac

hiev

es la

rge

ster

eolis

teni

ng °

ten

such

as

the

new

E -

V R

EG

AL

III

RE

GA

LS

uper

-co

mpa

ct, s

pect

ally

des

igne

d sy

stem

with

tailo

red

com

pone

nts

to g

ive

enha

nced

rang

e an

d pu

rity

of to

ne w

ith le

ast l

oss

ofef

ficie

ncy.

Doe

s no

t req

uire

hig

h po

wer

edam

plifi

er. N

et $

147.

50

ha -

hale

s o

15"

Iliie

e-tv

o, s

peak

er a

skli

us:

E -

V E

MP

IRE

' (w

ith 1

5TR

X8I

, Net

$17

8S

TR

X11

.lo

14?,

1S4

112T

RX

II, b

ut w

ithad

ded

boss

effi

cien

cy Ir

ons

larg

e co

ne, a

ndde

liver

ing

low

er b

ass

resp

onse

.

*E -

V s

yste

ms

whi

rh r

an h

e en

tand

arl w

ith F

.Ir S

itild

ing

Blo

cks

whe

neve

r yo

ur b

udge

t per

mits

.

NO

TE

: All

E -

V e

nclo

sure

s al

so a

vaila

ble

in li

med

oak

or w

alnu

t fin

ish

You

nee

d th

eto

tally

com

patib

leE

-V

ST

ER

EO

CA

RT

RID

GE

* th

e fir

st s

tere

o ca

rtrid

ge*

the

only

fiel

d te

sted

ste

reo

cart

ridge

Tho

usan

ds a

lread

y in

use

pro

ve it

* P

loys

ALL

RE

CO

RD

S B

ET

TE

RU

nexc

elle

d fo

r st

ereo

; sup

erio

r ev

en to

your

pre

sent

car

trid

ge fo

r m

onau

ral

* H

ighe

st v

ertic

al a

nd h

oriz

onta

lco

mpl

ianc

eF

or s

uper

ior

trac

king

,lo

nges

t rec

ord

wea

r

* B

est c

hann

el s

epar

atio

nov

er 2

0 db

bet

wee

n ch

anne

ls

* F

latte

st r

espo

nse

Fla

t bey

ond

audi

bilit

y to

RIA

A c

urve

* H

um a

nd r

umbl

e fa

r be

low

any

mag

netic

car

trid

ge*

Tw

o ce

ram

ic e

lem

ents

del

iver

pre

cise

RIA

A c

urve

with

no

burn

!

* E

xclu

sive

E -

V B

uilt-

in V

ertic

al R

umbl

eS

uppr

esso

r al

low

s re

cord

cha

nger

use

for

Sid

es*

.7 -

mil

repl

ocea

ble

(dia

mon

d or

sapp

hire

) st

ylus

is th

e id

eal s

ize

...gi

ves

you

bette

r re

prod

uctio

n,lo

nger

rec

ord

wea

r

The

n ch

oose

a s

erve

d am

plifi

er a

nd p

ro.

ampl

ifier

. If t

his

is y

our

initi

al h

igh

fidel

itysy

stem

,st

art w

ith a

ny s

tere

opho

nic

dual

ampl

ifier

-pr

eam

plifi

er. P

lay

mon

aura

lly u

n-til

you

odd

a s

econ

d sp

eake

r fo

r st

ereo

.

111L

111-

1.1

M00

0000

0000

OC

The

E -

V T

o al

ly C

ompa

tible

Ste

reo

Car

trid

ge is

the

indu

stry

's s

tand

ard.

Cho

ose

the

mod

el to

fit y

our

need

s:M

OD

EL

210-

Ste

reo

with

.7 -

mil

Dia

mon

dS

tylu

s, N

et $

19.5

0

MO

DE

L 26

D5T

-Duu

l Sty

lus

Tur

nove

r fr

om.7

-m

il D

iam

ond

Ste

reo

to 3

-m

il S

apph

ireM

onau

ral,

Net

$22

.50

or th

e E

-V

Vel

ocity

Ste

reo

Car

trid

geM

OD

EL

21M

D-S

tere

o w

ith .7

-m

ilD

iam

ondS

tylu

s,N

et $

19.5

0

MO

DE

L 26

MD

ST

-Dua

l Sty

lus

Tur

nove

r fr

omD

iam

ond

Ste

reo

to 3

-m

il S

apph

ireM

onau

ral,

Net

$22

.50

p811

141.

4.'"-

- Add

-on

E -

V B

AR

ON

ET

*...

smal

lest

fold

ed -

horn

cor

ner

encl

osur

e fo

rbe

st m

usic

alba

lanc

e an

d re

spon

se r

ange

: phe

nom

enal

bas

s ra

nge;

exte

nded

two

full

octa

ves.

Mat

ches

the

Cor

onet

and

oth

er

com

para

ble

spea

ker

syst

ems.

With

SP

8B, N

et $

74.5

0, o

rB

AR

ON

ET

Ill w

ith S

P8B

and

735

B V

HF

driv

er, N

et $

111.

50

Add

-on

E -

V A

RIS

TO

CR

AT

*...

popu

lar

fold

ed -

horn

cor

ner

encl

osur

e ...

com

pact

, eco

nom

ical

..

deliv

ers

mos

tex

tend

ed b

ass

surg

e fo

rits

sire

. With

SP

128.

Net

$10

7.00

; with

3 -

way

12T

RX

B,

N-'

$1,3

A

Add

-on

E -

V M

AR

QU

IS:..

mat

chin

g al

ong

-the

-w

all c

ount

erpa

rt o

f the

popu

lar

Aris

tocr

at. R

espo

nse

dow

n to

40

cps.

With

SP

12B

, Net

$98

.00;

with

3 -

way

I2T

RX

B, N

et $

129

Add

-on

E -

V R

EG

AL

III

...

supe

r -c

ompa

ct, s

peci

ally

des

igne

d sy

stem

with

tailo

red

com

pone

nts

to g

ive

enha

nced

ran

ge a

nd p

urity

of t

one

with

leas

t los

s of

effi

cien

cy. D

oes

not r

equi

re h

igh

pow

ered

am

plifi

er, N

et $

147.

50

Add

-on

E -

V E

MPI

RE

*...

dire

ct r

adia

tor

Klip

srh-

licpn

sed

taw

-ba

y m

u -I

nsur

e tn

i.bo

red

for

use

alon

g -t

he -

wal

l or

inco

rner

.S

moo

th,

exte

nded

bas

s re

spon

se. W

ith E

lect

ra -

Voi

ce 1

5TR

XB

3 -w

ay s

peak

er, N

et $

178

Syst

ems

show

n ar

e bu

t a f

ew o

f th

e m

ultit

ude

of E

-V

com

-bi

natio

ns f

ound

in e

very

pri

ce c

lass

. Ask

you

r de

aler

or

wri

te E

lect

ro-V

oice

for

info

rmat

ion

on th

e in

dust

ry's

mos

tco

mpl

ete

line

of h

igh

fide

lity

spea

kers

and

enc

losu

res.

OR

OR

OR

Add

-on

the

new

E -

V C

OR

ON

ET

!' ..

true

, bal

ance

d hi

gh fi

delit

y re

prod

uctio

nin

ext

rem

ely

smal

l eco

nom

ical

spa

ce -

savi

ng

ilfor

m: o

nly

10 in

ches

of

kwal

l spa

ce r

equi

red.

Com

plem

ents

Aris

tocr

at,

,.ar

quis

, Bar

onet

or

para

ble

spea

ker

sys.

.W

ith S

P8B

8 -

inch

eske

r, r

espo

nse

dow

n'

` to

70

cps.

, Net

$65

.00

or a

dd -

nn C

OR

ON

ET

IA w

ith S

P8B

and

T35

13 V

HF

driv

er, $

102.

00, o

r ad

d-on

RE

GA

L IA

, Net

$10

3

Add

-on

STE

RE

ON

IA

The

all

-new

Ele

ctro

.Voi

ce s

peak

er s

yste

Mth

atso

lves

;our

spa

ce p

robl

em-s

ever

you

mon

ey. W

here

spa

ce d

oesn

't pe

rmit

you

to o

dd a

sec

ond

full

-ran

ge s

peak

er,

Ste

reon

isth

e an

swer

.It'

sco

mpa

ct,

beca

use

the

Ste

reon

rep

rodu

ces

only

thos

efr

eque

ncie

s ne

eded

far

ster

eo. B

oss

belo

w30

0 Lo

s du

es 1

14, t

o.,ii

141L

IVIO

.11

0100

effe

ct ..

. so

bass

from

bot

his

han

dled

by y

our

pres

ent f

ull -

rang

e sp

eake

r th

roug

hth

e ac

cess

ory

XX

3 S

tere

on C

ontr

ol F

itter

.

(Fin

est E

-V

mid

-bo

ss, t

rebl

e an

d hi

gh fr

equ

ency

com

pone

nts

give

sm

ooth

res

pons

efr

om 3

00 to

19,

000

cps.

)

ST

ER

EO

N IA

-for

sys

tem

s of

nor

mal

effi

-<

1011

CV

, Net

$99

.50

XX

3 S

TE

RE

ON

CO

NT

RO

L. F

ILT

ER

, Net

,

$30

LEC

TR

O-V

OIC

E, I

NC

., B

UC

HA

NA

N, M

ICH

IGA

N

For

emos

t in

Ele

ctro

-Aco

ustic

s-m

icro

phon

e, P

hano

Car

.H

igh.

Fid

elity

Lou

dspe

aker

s an

d E

nclo

sure

s,ob

lic A

ddre

ss S

peak

ers,

Mar

ine

lokt

rum

ents

, EV

I Pro

STE

P-U

PT

O T

HE

FIN

EST

EL

EC

TR

O-V

OIC

EST

ER

EO

'S S

TA

ND

AR

D

irtii

in000000

step

one

Iyo

u ne

ed th

eto

tally

com

patib

leR

V O

TT

IT11

10 0

AnT

nina

mT

hevs

ndo

eIrs

edy

in u

se p

ure

itpl

oys

all r

ecor

ds b

ette

r: u

nens

elle

d fr

ster

eo; s

uper

ior

even

to y

our

pres

ent

cart

ridge

for

mon

aura

l. H

ighe

st v

erti-

cal a

nd h

oriz

onta

l com

plia

nce.

Bes

tch

anne

l sep

arat

ion:

ove

r 20

db

betw

een

chan

nels

. Fla

ttest

res

pons

es:

Out

bey

ond

audi

bilit

y to

RIA

A c

urve

.H

um a

nd r

umbl

e or

e fo

r be

low

any

mag

netic

car

trid

ge. T

wo

cera

mic

ele

-m

ents

del

iver

pre

cise

RIA

A c

urve

with

no h

um! E

xclu

sive

E -

V B

uilt-

in R

umbl

eS

uppr

ess.

, ullu

ws

reco

rd c

hang

er u

sefo

r st

ereo

..7 m

il re

plac

eabl

e (d

iam

ond

or s

apph

ire)

styl

usis

idea

lsi

ze ..

.gi

ves

bette

r re

prod

uctio

n, lo

nger

reco

rd w

ear.

The

E -

V T

otal

ly C

ompa

tible

Ste

reo

Car

trid

geis

the

indu

stry

's s

tand

ard.

Che

ese

the

mod

el to

tit y

our

need

s:M

OD

EL

21D

-Ste

reo

with

.7 m

il D

ia-

mon

d S

tylu

sN

et $

19.5

0M

OD

EL

26 D

ST

-Dua

l Sty

lus

Tur

nove

rfr

om .7

mil

Dia

mon

d S

tere

o to

3 m

ilS

apph

ire M

onau

ral..

Net

$22

.50

or th

e E

-V

Vel

ocity

Ste

reo

Car

trid

geM

OD

EL

21M

D-S

tere

o w

ith .7

ma

Dia

-m

ond

Sty

lus

Net

$19

.50

MO

DE

L 26

MD

ST

-Dua

l Sty

lus

Tur

nove

rfr

om .7

mil

Dia

mon

d S

tere

o to

3 m

ilS

apph

ire M

onau

ral..

. .N

et $

22.5

0T

hen

choo

se a

sec

ond

ampl

ifier

and

pre

-am

plifi

er. I

f thi

s is

you

r in

itial

hig

hfid

elity

sys

tem

, sta

rt w

ith a

ny s

tere

o-ph

onic

dua

l am

plifi

er -

prea

mpl

ifier

.P

lay

mon

aura

lly u

ntil

you

add

o se

cond

spea

ker

for

ster

eo.

4 -w

ay 1

2 -in

chsp

eake

r sy

stem

cost

ing

betw

een

$200

and

$30

0su

ch a

s th

eE

-V

Duc

hess

IVE

(Net

$29

2)

thl S

isyo

ur p

reR

ent

prok

gsed

spe

aker

sys

tem

3 w

ey 1

8 'n

thsp

eake

r sy

stem

cost

ing

betw

een

$375

and

$40

0su

ch a

s th

e ne

wE

-V

Reg

ency

Ill

(Net

$39

3)

3 -w

ay s

peak

. sys

tem

(re

stin

g be

twee

n$3

00 a

nd $

325

such

as

the

E -

V M

arqu

is II

I(N

et $

303)

or th

e E

-V

Aris

tocr

at Il

l(N

et $

312)

spea

ker

syst

emco

stin

g be

twee

n$3

25 a

nd $

375

such

as

the

E -

V C

arlto

n IV

(Net

$35

9)

4-rx

-ny

corn

ur12

-in

ch s

peak

ersy

stem

cos

ting

betw

een

$325

and

$37

5su

ch a

s th

eE

-V

Cen

turio

n IV

E(N

et $

365)

4ui

rry

curr

ier

15 -

inch

spe

aker

syst

em c

ostin

gbe

twee

n$4

00 a

nd $

480

such

as

the

E -

V C

ardi

nal I

V(N

et $

425)

4 -w

ay /.

1)11

1U1

15 -

inch

spe

aker

syst

em c

ostin

gbe

twee

n$4

80 a

nd $

600

such

as

the

E -

V G

eorg

ian

600

(Net

$49

0)

4-w

ay c

orne

r ta

-anc

h sp

eake

rsy

stem

cos

ting

over

$60

0su

ch a

s th

e in

com

para

ble

E -

V P

atric

ian

(Pat

ricia

n IV

Tra

ditio

nal,

$970

;P

atric

ian

600

Con

tem

pora

ry,

$819

Nel

l

step

two

0

flEC

TIK

INO

la, I

NC

.. IIV

CIIA

NA

N, M

ICH

IGA

N

INN

EN

, in

Flo

rtro

.Aro

ustir

s-M

icro

phon

e, P

hone

-Cor

.H

ighl

idat

ity lo

udsp

eake

rs a

nd E

nclo

sure

s,P

olak

Add

,,,. S

peak

ers,

...in

*to

ssio

not F

lart

ioni

c In

itror

nont

and

Mili

tary

Mat

erie

l.

Add

en

the

E -

V

DU

CH

ES

S IV

E

Une

xcel

led

for

purit

yof

tone

and

ran

geth

roug

h hi

ghly

dev

el-

oped

4 -

way

driv

ersy

stem

. Sup

er -

effi-

cien

t, sm

ooth

re-

spon

se th

roug

h us

eof

diff

ract

ion

horn

sto

giv

e w

ide

ster

eolis

teni

ng a

rea;

bas

sis

esp

ecia

lly e

xten

d-ed

in r

ange

thro

ugh

E -

V P

hase

-Lo

adin

gpr

inci

ple

with

12"

driv

er m

ount

ed lo

wan

d at

rea

r of

enc

lo-

sure

. Com

pare

s in

perf

orm

ance

to c

or-

ner

horn

s.

Net

$29

2

Add

-on

the

(-V

AR

IST

OC

RA

T II

I

Item

pest

,de

luxe

Klip

sch-

licen

sed

sep

orat

e 3

-way

loud

-sp

eake

r sy

stem

for

smoo

th, e

ffici

ent

wid

e -r

ange

rep

ro-

duct

ion.

Use

s fo

lded

horn

thro

atin

com

-po

st fu

rnitu

re p

iece

of p

leas

ing

prop

ortio

ns. T

he w

alls

of t

heliv

ing

room

and

the

isCor

ner

form

the

larg

ern

mou

th r

equi

red

Or

low

est r

ange

pons

e. D

iffra

ctio

nrn

sin

treb

le a

ndry

hig

h ra

nge

inre

bes

t ste

reo

over

wid

est l

iste

ning

are

a.

Net

$31

2

Add

-on

the

E -

V

MA

RQ

UIS

III

Com

pani

on p

iece

mat

ches

Ar

i sto

crIII

. Use

s so

me

drin

4sy

stem

. Des

igne

dop

erat

e op

timum

tyal

ong

-the

-w

all

poi

tion

whe

re a

cor

nsis

not

ava

ilabl

e.

Net

$30

3

Add

-on

the

E -

V

CA

RLT

ON

IVD

elux

e ve

rsio

n of

the

Duc

hess

IVE

in s

mar

t,

hand

som

e In

w-b

nyde

sign

; har

mon

izes

grac

eful

ly w

ith m

any

mod

ern

furn

ishi

ngm

odes

. A c

ompl

ete

Pha

se -

Load

ed S

ys.

tern

,af

ford

ing

un-

usua

l bas

s re

spon

sew

ith s

moo

th, r

eso-

nanc

e -f

ree

char

acte

r-is

tics.

Incl

udes

del

uxe

I5 -

inch

indi

rect

bos

sdr

iver

4 -

way

com

po-

nent

s. Net

$35

9

Add

-on

the

k -V

CE

NT

UR

ION

IVE

New

com

plet

e 4

-way

syst

em in

corp

orat

ing

all d

esig

n fe

atur

es o

fth

e m

agni

ficen

t E -

VG

eorg

ian,

but

on

esm

alle

rU

ses

Klip

sch

"K"

fold

edho

rn w

ith E

-V

del

uxe

12 -

inch

indi

rect

-ra

di-

ator

spe

aker

sys

tem

,(1

2WK

LF

driv

er, M

T -

30 c

oaxi

al m

id -

bass

nnrf

treb

le a

ssem

bly,

T35

VH

F d

river

and

X33

6 cr

osso

ver)

. Re.

spon

se fr

om 3

0 cp

sto

bey

ond

audi

bilit

y.

Net

$36

5

Add

-on

the

E -

V

RE

GE

NC

Y II

I

The

ver

satil

e R

egen

cyIII

del

uxe

sepa

rate

3 w

ay s

yste

m a

llow

sop

erat

ion

in th

e co

r-ne

r fo

r fu

ll ba

ss e

ffi-

cien

cy o

r oo

long

the

wal

l for

con

veni

ence

.P

ower

ful 1

5 -in

ch b

ass

driv

er c

ross

es o

ver

at80

0 cy

cles

per

sec

-on

d to

diff

ract

ion

-ty

pe tr

eble

and

ver

yhi

gh fr

eque

ncy

com

-po

nent

s to

giv

e m

axi-

mum

dis

pers

ion

and

full

ster

eo e

ffect

.

Net

$39

3

Add

-on

the

E -

V

CA

RD

INA

L IV

Aut

hent

ic E

-V

Klip

sch

"K"

horn

not

ed fo

rde

ep fu

ndam

enta

lba

ss r

ouge

; com

ple-

men

ted

by d

iffra

ctio

npr

inci

ple

inco

axia

lm

id -

bass

and

treb

ledr

iver

ass

embl

y. V

ery

high

freq

uenc

ies

in-

sure

rea

lism

ove

rbr

oade

st li

ving

roo

mar

eas. N

et $

425

AD

D-O

N E

-V

54T

ER

E,O

NII

IT

he a

ll -n

ew E

lect

ra -

Voi

ce s

pee'

er s

yste

m th

at s

olve

s yo

ur s

pace

pro

blem

-sav

esyo

u m

oney

. Whe

n S

teen

dam

t pc

uni

t iv,

.r.

ruh

l r.

irrirr

rrI l

oll.,

ursy

e sp

ooks

.,o

Ste

reon

is th

e an

swer

. It's

com

pact

, bec

ause

the

Ste

reon

rep

rodu

ces

only

thos

efr

eque

ncie

s N

EE

DE

D fo

r st

ereo

(ba

ss b

elow

300

op:

doe

s no

t con

trib

ute

to th

est

ereo

effe

ct -

--

so b

ass

from

bot

h is

han

dled

by

your

PR

ES

EN

T fu

ll -r

ange

spe

aker

thro

ugh

the

acce

ssor

y X

X3

Ste

reon

Con

trol

Filt

er).

-----

Ste

reon

s ha

ve th

e fin

est E

-V

mid

-ba

ss, t

rebl

e an

d hi

gh fr

eque

ncy

com

pone

nts.

(Fre

quen

cy r

espo

nse:

300

to 1

9,00

0 cp

s).

ST

ER

EO

N 1

11 fo

r hi

gh e

ffici

ency

sys

tem

sN

et $

129.

50X

X3

ST

ER

EO

N C

ON

TR

OL

Not

$30

.00

NO

TE

: All

E -

V S

yste

ms

also

ava

ilabl

e in

lim

ed o

ak o

r w

alnu

t fin

ishe

s.

Add

-on

the

E -

V

GE

OR

GIA

N 6

00U

tiliz

es s

ame

horn

cons

truc

tion

and

driv

er c

ompl

emen

t of

Car

dina

l IV

enc

lose

dby

bea

utifu

l con

tem

-po

rary

hou

sing

func

-tio

nally

sty

led

byR

ober

t W. F

uldn

er.

Net

$49

0

Add

-on

the

inco

mpa

rabl

e

PA

TR

ICIA

NW

orld

's la

rges

t, m

ost d

elux

e lo

ud-

spea

ker

syst

em fo

r th

ose

disc

rimi-

natin

g lis

tene

rs w

ho &

mon

dul

timat

e to

nal p

erfe

ctio

n. T

heep

itom

e of

styl

e co

mbi

ned

with

pea

k pe

rfor

man

ce fo

rth

eul

timat

eill

usio

nof

real

ity.

Ava

ilabl

e as

the

Pat

ricia

n IV

in

trad

ition

al s

tylin

g.N

et $

970

Pat

ricia

n 60

0 in

Ful

dner

-des

igne

dco

ntem

pora

ry h

ousi

ng. N

et $

819

Spe

cial

mod

els

avai

labl

eto

cust

om -

finis

h sp

ecifi

catio

ns ..

. at

high

er p

rice.

Sys

tem

s sh

own

are

but a

few

of t

hem

ultit

ude

of E

-V

com

bina

tions

foun

d in

ever

y pr

ice

clas

s. A

sk y

our

deal

er o

rw

rite

Ele

ctra

-V

oice

for

info

rmat

ion

onth

e in

dust

ry's

mos

t com

plet

e lin

eof

high

fide

lity

spea

kers

and

enc

losu

res.

Circle 45-01 on inquiry form page 73

Every part of every Collar() changer

is precision -engineered to meet the rigid demands of Stereo

The new stereo records require a higherstandard of performance from your recordchanger than do standard LP's because stereocartridges are extra -sensitive to noise. That's why.in planning your stereo system, you begin with theCollaro. Every part of every Collaro changer isprecision -engineered to meet the rigid qualitydemands of stereo.

The motor (see A above) is dynamically bal-anced, so rigidly mounted that wow and flutterspecifications are superior to any changer.

The spindle assembly (B) reflects this pre-cision quality in every part. The spindle itselfis micro -polished for complete smoothness.

The sensitive velocity trip mechanism (partshown in C) has been designed so that the

Circle

changer can trip at extraordinary light trackingpressures.

The exclusive Collard transcription -type tonearm (D) with the new plug-in head (E) is de-signed to eliminate all resonances in the audiospectrum. The new four -pin head - the only highfidelity changer with this feature - provides theultimate in noise -reduction circuitry.

There are three Collaro changers ranging inprice from $38.50 to $49.50. No matter which youselect, you're sure to start your system off rightwhen you choose Collaro - the turntable thatchanges records.

For new Collaro catalog write to Dept.ET-9,Rockbar Corporation, Mamaroneck, New York.46-01 on inquiry form page 73

Rockbaris the American

sales representativefor Collaro, Ltd.

46 ELECTRONIC TECHNICIAN Stereo, 1959

The Meaning of Stereo

Stereo means a new horizon of electronic enter-tainment. A refreshing treat is in store for thethousands of audio enthusiasts and millions of musiclovers who have made the term High Fidelity abyword in American homes.

Stereo-short for stereophonic sound-adds thedimension of depth to our listening pleasure. It en-hances the sense of realism in sound reproduction.

How Stereo Works

Just as our eyes perceive depth by each eyeseeing a particular scene slightly different from theother, so our ears detect depth in sound.

In the conventional monophonic sound system,a single one -channel program is reproduced. Eventhe use of two speakers does not provide a realsense of depth in monophonic sound because thesound reaching the ears does not have the informa-tion needed for the stereo effect.

With stereo, two (or more) spaced microphonesrecord the program material in separate channels.Each channel recording is different, in an amountdetermined by the relative intensities and locationof the program source or sources in relation to themicrophones.

When the program recordings are picked up andreproduced through separate amplifier -speakerchannels, and a greater portion of the sound fromeach channel reaches each ear, respectively, in amanner similar to the original sound reaching themicrophones, depth is perceived aurally.

Equipment for StereoStereo on magnetic tape

multiple tracks on a singlesound channels to be keptthrough separate electronicmachine.

came first. Recordingtape enables the twoapart and reproducedchannels in the same

With disc recordings in very wide use, the in-dustry sought a practical means for producing andreproducing from stereo records. To the notablecredit of industry engineers, a means was developedfor recording two channels of sound in a singlerecord groove. The two channels are picked up bya single needle in the new stereo cartridges. Basi-cally, this is accomplished by the groove impartingup-and-down motion to the needle, in addition tothe conventional side -to -side.

The electrical signals from the cartridge arepassed through two preamp/amplifier channels, andreproduced in two speaker systems placed apart ina manner which provides the stereo effect.

Stereo has even entered broadcasting, one soundchannel being broadcast on FM, the other on AM.For the future, tuners may be adapted to receivemultiplex signals; that is, two channels on one FMstation.

Stereo-Now!Stereo is no longer a drawing -board concept. A

wide selection of stereo equipment from manymanufacturers is available today at reasonable cost.Good equipment will not only give you stereo . . .

it will give you stereo high fidelity.If you presently own good monophonic equip-

ment which you do not wish to discard, units forthe second channel can be added for stereo. Forthe many people who are not adept at makingelectronic hookups, the local electronic servicetechnician has the know-how and equipment tomake the conversion.

If you are starting afresh, a wide range of attrac-tive equipment, specially designed for stereo, isyours to select.

A rapidly growing number of stereo discs arebecoming available.

Get more listening pleasure. Get stereo!

ELECTRONIC TECHNICIAN Stereo, 1959 47

Fig. 1-Early single groove stereo discs hada vertical and horizontal axis. The 45/45Westrex system, shown on the right, main-tains the same relative position between thetwo axes, but both axes are rotated 45°, as aunit, to obtain symmetry of movement.

Stereo Discs

Two Channels

In One Groove

Fig. 2-A. Right channel modulates outer side wall. Stylus travels up to the left and down tothe right. B. Inner side wall is modulated by the left channel. Stylus travel is up to the rightand down to the left. Groove center is always midway between both walls.

E4

UNMODULATED ORREFERENCE GROOVE

I REFERENCE IV CENTER y

3 1E4

2

GROOVE CENTER

OUTER SIDEWALL


I REFERENCEV CENTER y

RIGHT NANDINFORMATION

ON

OUTERSIDE WALL

LEFTHANDINFORMATION

ONINNER

SIDE WALL

OUTER SIDEWALL

GROOVE CENTER4INNER SIDEWALL

3E8

The intelligence in the modernmonophonic LP record is pressedinto the groove in such a manner asto enable a cartridge whose stylus ismoving in a horizontal plane to re-cover the information on playback.Older forms of records, now obso-lete, required the playback stylus tomove up and down. London Recordsused a combination of these twomovements for monogroove stere-ophonic recording. Demands on thecartridge for equally high compli-ance in both the horizontal and ver-tical direction presented difficultmechanical problems. Some of theseproblems were alleviated whenWestrex introduced the 45/45 sys-tem. While the 90° relationship be-tween the vertical and horizontalaxis was maintained, both axes wererotated 45°, as shown in Fig. 1.

Symmetry of movement was thusachieved for each channel.

In this system the stylus is forcedto travel a diagonal path for eachchannel. The right hand channelmodulates the outer side wall of thegroove, which means that the stylushas to travel up to the left and downto the right as shown in Fig. 2A.Part B of this figure shows that forthe left hand channel, which modu-lates the inner side wall, the stylusmust travel up to right and down tothe left. In both cases the side wallwhich is not modulated remainsstraight. (The groove traverses aspiral path. To simplify drawingsand text the unmodulated groove ispresented as a straight line which isessentially true for the relationshipbetween the cutting stylus and thegroove. The concept of what actually


THE STEREO RECORD

Westrex 45/45Diagonal Motion

Horizontal ComponentsVertical Components

Mechanical PhaseIn -Phase

Vertical MovementOut -Of -Phase

Horizontal Movement

Electrical PhaseIn -Phase

Horizontal MovementOut -Of -Phase

Vertical Movement

Movement IndicatorsGroove Width

Vertical DisplacementGroove Center

Lateral Displacement

happens is not affected thereby.) Asthe stylus rides up and down, thegroove becomes narrower and widerrespectively, and as the stylusmoves back and forth the centerline of the groove moves according-ly. It is well to keep in mind thatthe needle point is always in thegroove center, and that the needlealways contacts both sidewalls.

This is true, even though thereare two different signals impressedin each groove and one sidewallmay have many more curves thanthe other; and the needle may traceout circles, and ellipses; if the sty-lus is tracking properly it mustmaintain contact with both sidewallsat all times.

Contrary to some published state-ments the stylus cannot trace out acorkscrew motion. All motion isconfined to the vertical plane whichcuts the record in half along its di-ameter. Vertical, horizontal and di-agonal stylus motions are all on thisplane. The stylus cannot, or at leastis not supposed to, travel eitherbackwards or forwards. This ofcourse applies to actual stylus mo-tion. Relative motion between thegroove and stylus-if projected in adrawing-could in some cases ap-pear as a corkscrew.

At any given instant the stylusis in one position only. This position"defines" both walls. The questionnow is what happens to the styluswhen both channels are differentlymodulated at the same time. Fig. 3illustrates how the stylus motion andrelative groove width, at any giveninstant, corresponds to the differentforces at work. When both chan-nels are pushing up at the sametime and the same amount, thestylus will travel straight up.

This in -phase motion can also(Continued on page 96)

SY

ONLY

CHANNEL A .

MODULATED).

REFERENCE

ONLY

CHANNEL B(MODLt_ATED

01111REFERENCE

GROOVE

(CHANNELS AzB

BOTH

MODULATED

illl

Fig. 3-Stylus position on disc for various conditions of modulation. The stylus may move upor down, and right or left depending upon the information impressed on each channel.

Fig. 4-Top. Pinching and expanding groovescause stylus to rise and fall. Straight centerline indicates that there is no lateral motion.Bottom. Equal size grooves allow the stylusto ride without vertical displacement. Curvedcenter line shows lateral motion.

Fig. 5.-Combination of both lateral andvertical displacement at the same time, andvaryirg conditions from one instant to thenext give the groove a shape that seeminglycannot be tracked. It can-see text!


ly


( MAY BE MOUNTED ONBACK OF VOLUME CONTROL)

Fig. 1-Switch and outlets on master con-trol box can turn the entire system on oroff. It is possible to have the switch on anautomatic record player perform this func-tion by inserting it in the line at point X.

INPUTCHANNEL A

COMMON

INPUTCHANNEL B

APPROX.MEG

OUTPUT CHANNEL .A

OUTPUT CHANNEL B

APPROX.!MEG

Fig. 2-Dual linear controls, each wired inreverse order can equalize the sound fromboth channels without changing the overallvolume level. As one level goes up the othergoes down.

MVO Mt AI. COVINCI41

CHANNEL A

CHANNEL

NORMAL

REVERSE

DPOT

---0 STEREO

COMMO

SPOT

MONOPHONICDUAL AUDIO

POWER

RIGHTT2HANNEL&WW1.

TOLEFT CH ANNE

AIN, ER

Fig. 3-The SPDT switch enables the listenerto change from stereo to monophonic witheither channel fed into both amplifiers andspeaker systems. The stereo channel revers-ing switch also determines which signalchannel is used for monophonic purposes.

Master Control For StereoOne -Knob Control For Both Channels.

Getting stereo is one thing; con-trolling it to give its best is another.All of the three potential sources,radio, tape, or disc may be present,but the program must be balanced,both tonally and stereophonically,and at the right listening level forbest enjoyment. The control unitmay be part of the preamplifier, ora separate but complete master con-trol center. The master control mayconsist of passive and amplifier cir-cuits, or passive circuits only withjust switches, plugs, and other con-trols. It may also contain equaliza-tion and other matching networks.The import of the question, "Do wewant more or fewer knobs?" is nowmultiplied by two, and then some.

At first thought it may seem asthough the control center would as-sume monstrous proportions, butactually compact units about 1/3 rdthe size of a tuner are available, orcan be constructed. However, theamount of electrical accomplish-ments and added convenience thislittle box provides are so great thatthey may spell the difference be-tween selecting a stereo program inthe same manner as an ordinaryprogram from a table radio by justflicking a switch, or selecting an at-tack of stereo knobitis.

It is possible to perform most orall of the following functions, witha properly designed control box, andwith minimum effort:

1. Power-Turn the complete sys-tem on or off.

2. Balance-Or focus, equalizeoutput from both channels,without changing volume.

50

3. Volume-Control volume levelwithout losing balance.

4. Stereo-Normal stereo programin, normal stereo out.

5. Reverse-Reverse stereo pro-gram in, normal stereo out; orvice versa.

6. Monophonic-(A) Monophonicprogram on one channel only.(B) On both channels in par-allel for dual power, and use ofboth speaker systems. (C)Stereo program in, monophonicout of one or both channels.

True, these are a lot of functions,but once the system is installed,there should be no unusual diffi-culty or need for excessive knobhandling. There are as many if notmore controls and adjustments on aTV set. Once the system is in oper-ation it is only necessary to flip oneswitch to turn on the system, selectthe program, and adjust the volumecontrol.

The control box may also providetone controls, loudness contour con-trols, rumble filter and a blend con-trol. So far as the consumer isconcerned, this is as far as he has togo, but the technician must considera mass of additional detail. Like anycontrol center in any mechanical orelectrical system, connections to thevarious components to be controlledmust be provided. To obtain the de-sired functions just described thefollowing jacks or connectors shouldbe available, preferably in the rearof the unit.

1. AC power outlets2. Audio outputs3. Tuner Inputs

4. Tape Inputs5. Phono Inputs

Power OutletsThe power outlets and associated

wiring should have sufficient watt-age ratings to safely handle the load.If all the a -c power is fed throughthe switch and outlets on the con-trol box, as shown in Fig. 1, thenall the components can be controlledby one switch. It is also possible toarrange a system in which the rec-ord changer can shut off all equip-ment after the last record is played.Usually no more than two outletsare required because the amplifierand other components have poweroutlets which can be used. It mayalso be desirable to have a pilotlight in the control box.

Balance & VolumeIt would seem ideal in a stereo

system to gang almost all the simi-lar controls in both channels; equal-ization, volume, loudness, and tone.This makes for simplicity. If thevolume and loudness controls arestacked, a balance or focus controlis needed. Although a 1 db changein level is difficult to detect on asingle channel, it does make a no-ticeable difference in stereo. This isa good reason for checking balancewith a known stereo recording,while sitting in a desirable position.Separate test and level adjustmentsof first one channel and then theother is hardly adequate.

Because stereo balance is fairlycritical, the balance control may

(Continued on page 94)Circle 51-01 on inquiy form p. 73ELECTRONIC TECHNICIAN Stereo, 1959

THANK THE KEEN -EYED SNOOPERAs little as .0035 of an inch off in the dimensions of this Utah speaker basket-and a rejecthits the bin! At Utah the quality of final performance in the speaker you buy is a jealouslyguarded value. If you could visit our Huntington plant you'd probably agree with AcePhotographer Lieberman that Utah speakers prove rejection is the foundation of perfection.

Pre -assembly, plating, coil winding, wiring . . . at every step down the production linestand the "keen -eyed snoopers." They search ruthlessly for the tiniest defect that couldmar, even minutely, the response performance off a Utah.

Make certain your next speaker is a Utah. Know that your sound will be as perfectlyreproduced as human skills, controlled by rigid inspection, can produce.

See the Utah Custom Line: a quality speaker for every system need.

* ARCHIE LIEBERMAN,famous newsmagazine*photographer, was given thisassignment on a recentUtah plant tour: Photographthe essence of Utah qualityas you see i: The ptotoshown here is tie result.(*Look, Life, Time, Pageant,Parade, Newsweek Endmany others)

OWL PAX CL#2,646 thei Alta& choice/Send for the big Utah Catalog. Dept. 2, UtahRadio & Electronic Corp., Huntington, Ind.

Converting to StereoPresent Record Players Can Accept The New Stereo Cartridges.

Probably the most critical portionof the work is in the installation ofthe stereo cartridge. In most casesit will be necessary to run a newlead through the pickup arm toaccommodate the 3rd or 4th termi-nal. In anticipation of the conver-sion job, many new cartridges arepackaged with the necessary termi-nals, wire, spacer washers, andscrews. Conversion kits are alsoavailable for the various recordchangers and turntables. Tone armshaving plug-in cartridge holders,equipped with only two terminalspresent a bit of a mechanical prob-lem if the plug-in feature is to bemaintained.

Most conversion kits solve thisproblem by providing a new 3 or4 -terminal fitting and shell. How-ever, in some cases it is necessaryto dismantle the tone arm to assem-ble these new parts. It may be pos-sible to do this without upsettingtoo many adjustments on somechangers. It is therefore importantthat no more work or dismantlingbe accomplished than is absolutelynecessary. Once a changer tone armis worked on, it becomes necessaryto check stylus pressure, set down,trip mechanism and arm elevationduring the change cycle. In the ab-sence of a conversion kit it is pos-sible to fit a flat piece of metal intothe rear portion of some cartridgeshells, where the terminals are, insuch a manner as to contact another

Fig. 1-To establish the second channel forstereo disc programs, it is necessary to add asecond amplifier and speaker, and to changethe cartridge. The control box is optional.

52

flat piece of metal which has to beinstalled on the tone arm, as shownin Fig. 2. This is tricky, and can beavoided by sacrificing a little mo-bility. Run the third wire directly tothe cartridge. Leave enough slack todisengage the shell, and to slide thewire clip on or off the cartridgeterminal.

Still another problem manifestsitself, if for some reason it is desiredto plug in a two -terminal shell andits monophonic cartridge after thearm has been wired for stereo. Oneof the hot leads for the stereo car-tridge will have to be grounded for

Fig. 2-To convert a two -pin shell to accepta stereo cartridge, it is necessary to pro-vide a connection for the added terminals.

the monophonc cartridge. Lookingat the terminal end of a stereo car-tridge with the stylus pointingdown, the pin on the right is for theright channel, and the pin on theleft is for the left channel. The cen-ter terminal or terminals go toground. In the four -pin cartridgethe two center terminals may ormay not be tied together dependingupon wiring and electrical require-ments. Since the monophonic car-tridge utilizes the two outer termi-nals, what now constitutes one hotterminal for one stereo channel willhave to become a ground connectionfor the monophonic cartridge. Itthen becomes necessary to install aSPDT switch as close to the car-tridge as possible. The farther awaythis switch is installed, the greateris the possibility of introducing hum.All this of course points up the factthat the more functions that are

Fig. 3-To revert back to a monophonic shell,once a conversion has been accomplished, itis necessary to provide a hum -free switch.

added, and the more complex theinstallation becomes, the noisier thesystem is going to be. If the mono-phonic cartridge is installed in astereo shell, it can be wired to anappropriate end terminal and thecenter ground terminal. Keep theinstallation as simple as possible.Except for very rare occasions, thereshould be no need to switch backto a monophonic cartridge once astereo unit is installed.

If the two elements of the stereocartridge are connected in parallel,it will become fairly insensitive tovertical stylus movement and mayeven render superior performanceon a monophonic system. This isanother good reason for installing astereo cartridge as soon as possibleeven before the additional amplifierand speaker are obtained. Also,some monophonic cartridges coulddamage the new stereo discs.

Impedance matching and ampli-fier input sensitivity are important,and require the same care and con-sideration as before. As a generalrule, the former high -impedanceamplitude -sensitive ceramics re-quire still higher input impedanceto avoid loss of bass, but in mostcases do not require preampli-fication or equalization. The low-impedance, velocity -sensitive mag-netics, moving coil, moving iron andvariable reluctance types should beplayed through a preamplifier andequalization circuitry. Both typesgive a smaller output voltage toeach stereo amplifier. In most cases,sufficient reserve power is available.

(Continued on page 58)Circle 53-01 on inquiry form p.

ELECTRONIC TECHNICIAN Stereo, 1959

YOUR MOSTVALUABLE FRANCHISE

FA -670, Deluxe FM -AM Tuner, $179.50

FA -680, Deluxe Stereo FM -AM Tuner, $199.50

4.44.4 AU:

111111111111111111111NINIIMIllitti,-.MINEllillirft

FM -660, Deluxe FM Tuner, $149.50

FA -690, Deluxe Stereo FM -AM Tuner and Preamplifier, $265-.50

SP -210, Stereo Preamplifier, $89.50 SP -216, Stereo Preamp and Audio Control, $189.510

111

111111111111111111iiplipplll

ETEREOPMONIC AMPLIFIER

SM-245, Stereo Preamp and Control Amplifier, $189.50 SA -232 (64 Watts Peak), Stereo Basic Amplifier, $89.50SA -260 (120 Watts Peak), Stereo Basic Amplifier, $129.50

Exciting new products, backed by powerful nation-wide advertising, these will sparkyour stereo sales to new highs-building profits and prestige all the way. ACT now!

Pao," RADIO CORPORATION 37:38 36th Street, Long Island City 1, New York 4'

Electronics manufacturer for more than 39 years.

MOVINGCOIL

VARIABLERELUCTANCE

or MOVING IRON

Fig. 1-The stereo cartridge has two elements set at right angles ramic, moving coil, moving iron or other conventional types. Cart -to each other, and 45 from the vertical. The elements may be ce- ridges may have 3 or 4 pins. They can be used on monophonic discs.

The Stereo CartridgeComplex Mechanical Forces Work On Cartridge Having

One Stylus, Two Elements, Three Or Four Terminals.

STEREO CARTRIDGEVelocity Sensitive

Moving CoilMagneticVariable Reluctance

Amplitude SensitiveCeramic

OutputLevels

HighLow

ImpedanceHighLow

Terminals3 pin4 pin

PhasingMechanicalElectrical

Rumble SuppressionMechanicalElectrical

The stereo cartridge is anotherexample of modern ingenuity. Fora long time the industry waswrestling with gigantic monophoniccartridge problems dealing with fre-quency response, output character-istics, compliance, stylus pressure,undesirable resonance conditions,hum and noise suppression, etc. Somuch work was accomplished thatno longer was it valid to think in

54

terms of inherent characteristics.Inherent characteristics have beencompensated for to the point wherea normally non-linear device ismore linear than some units whichnaturally have good linear qualities.This is true for the many othercharacteristics; so much so, thateach cartridge should be evaluatedon an individual basis rather thanaccording to type.

Before the engineers could claimvictory over all of the problems inmonophonic cartridge design, stereostuck its two -element head into thelaboratory.

The problems now multiplied ata rate that was pretty much in stepwith the square law. Twice as manychannels meant four times as manycomplexities.

Several new parameters appearedsuch as separation between chan-nels,ouniform and equal output fromboth channels, and susceptibility tovertical rumble. The problems ofdistortion and intermodulation dis-tortion have yet to be resolved100%. In the early days the car-tridge people needed a test stereodisc. The disc people needed a stereocartridge. Because the final resultsdepended on the quality of bothitems, and because of an absenceof a standard, it looked as thoughthis bottleneck would last a longtime.

However, once the stereo ball

started to roll, various segments ofthe high fidelity industry began tomove at once. Now in somethingbetter than record time, the stereocartridge is a reality, as are thestereo disc and the components toplay them. Except for three orfour terminals the outside appear-ance of the cartridge is conven-tional. Internally, almost all stereocartridges have another elementadded. The two elements are ar-ranged so that they are at a 90°angle from each other, but at a 45°angle from the vertical, as shown inFig. 1. The elements used may beany of the conventional types, mov-

Fig. 2-Vertical stylus displacement isa result of in -phase mechanical forces.


ing coil, magnetic, crystal, etc. Itmay even be possible to use a com-bination of different elements. Be-cause both elements in the cartridgeare placed on a 45° angle, they aresensitive, to a degree, to both ver-tical and lateral movements. The upand down displacement is a vectoralsum of in -phase mechanical motionas shown in Fig. 2. Since it is speci-fied that the signal must be out ofphase for this condition, either oneelement or its leads must be re-versed. This is accomplished in themanufacturing process. Fortunately,this also satisfies the requirementthat an in -phase signal be derivedfrom a horizontal motion. Fig. 3 il-lustrates relative output voltages fordifferent stylus motions.

This also happens to be a verydesirable feature for monophonicplayback. By connecting both ele-ments in parallel, the cartridge be-comes insensitive to vertical motion.(Equal and opposite voltages can-cel each other.) For stereo appli-cations it is also possible electricallyto mix a portion of the low frequen-cies in both channels so that thevertical rumble component is can-celled out. It can be done withoutcompromising the stereo effect.Many cartridge makers are usingmechanical vertical -suppression de-vices, usually in the form of abumper or buffer wedged betweenthe stylus and cartridge body. Someare using the electronic mixingmethod which may consist of abridging resistor from one elementto the other.

3 -Pin or 4 -PinSome question will no doubt be

raised about the use of 3 or 4 -terminal cartridges. For most appli-cations the 3 -terminal units arequite satisfactory, and if all other

conditions are the same, no dif-ference in performance will benoticed. An advantage offered bythe 4 -terminal cartridge is the avail-ability of separate ground connec-tors. Benefits from this feature canbe realized if a ground loop is en-countered or if for some other rea-son unstable problems should arisefrom a common ground connectionat the cartridge end.

If it should become necessary toalter the phasing characteristics ofthe stereo cartridge, in the field, itcould be readily accomplished withthe 4 terminal units. The systemshave been standardized to the point,where it should not be necessary toresort to such phasing gimmicks.The experimenter may for somereason wish to connect both ele-ments in series; this configuration ispossible with either the 3 or 4 ter-minal cartridge. In some cases, inorder to minimize hum and satisfywiring conditions the two groundterminals in the 4 -terminal car-tridge may have to be tied together.However, the added flexibility of thefourth terminal is, desirable, but notnecessary, for some of the reasonsadvanced. A certain amount of pre-caution should be exercised wheninterconnecting two ac -dc type am-plifiers, or other equipment, espe-cially if the chassis are connectedto one side of the power line. If thelow side of the plugs or jacks areconnected to the chassis there is adanger of placing 117 volts acrossthe two ground terminals on the4 -pin cartridge which may be spacedless than 1/16" apart, as shown inFig. 4. Normally these jacks are notat chassis ground. Concern here isnot so much for equipment protec-tion as it is for protection of theequipment user. The 3 -terminal

Fig. 3-Relative output voltages obtained from various stylus motions. In -phase me-chanical forces result in out -of -phase electrical signals. Conversely, out -of -phase me-chanical forces cause in -phase signal. Because low frequencies are essentially in -phasesignals, they will be found mostly in the horizonal components of the stereo disc.

ELECTRICAL PHASEOUT

--

IN

-

I-

SIGNALVOLTAGE

POLARITY

STYLUSMOTION

IN OUTMECHANICAL PHASE

cartridge in this situation would bea safer bet, because the house fuseor wires going to the cartridgewould let go instead of leaving apotential shock hazard. Fortunatelymost if not all high fidelity equip-ment is power transformer equippedand line voltage leakage to groundis within safe limits.

Impedance MatchingIn general, impedance matching

requirements are the same. How-ever, in all cases the manufacturer'sspecifications should be consulted.Certain normal load conditionswhich may be satisfactory in manyinstances can be noticeably im-proved by the addition or change ofonly one resistor. The velocity sen-sitive cartridges which include the

Fig. 4-Possible shock hazard may be set up,with some AC DC equipment and cartridges.

magnetic, variable reluctance, mov-ing coil, and moving iron require anequalized preamplifier for eachchannel. The conventional types aresatisfactory in most cases. The ce-ramics and other high level outputcartridges generally can work di-rectly into the amplifier. The outputversus frequency response curve forthese cartridges are equal to thecompliment of the RIAA recordingcurve, and therefore the amplifiershould have a flat frequency re-sponse.

When the normal high impedanceinput in amplifiers which are in theorder of 500,000 ohms are used forstereo, they will attenuate some ofthe low frequencies. This conditionis easily remedied by following theinstructions for each cartridge,which usually specifies an increasein the input resistance. In somecases up to 8 megohms are recom-mended.

Certain desirable design charac-teristics are responsible for smallersignal output from the stereo car-tridge. There is usually more thanenough reserve gain in the pream-plifier and amplifier to provide asatisfactory output level.


Needles For StereoVertical Sensitivity Of Cartridge Requires Additional

Precautions To Avoid Distortion And Tracking Problems.

CHARACTERISTICS

ElectricalDistortion

IMHarmonic

Noise

MechanicalExcessive WearTracking

InstallationAlignmentPressureSizeMaterialQuality

In spite of certain claims of com-patibility in various respects for thenew stereo disc systems, a closerlook reveals that, while the same sty-lus and pickup will play both themonophonic and the new stereo discsit is advisable to use the right stylusfor each. Here's a quick rundown onthe way the new stereo records af-fect the needle problem.

Both systems use the RIAA curve,therefore the problem frequencies(preemphasized highs) are the sameas regards to having the needle fol-low the groove. This is shown inFig. 1. The extremely vigorousmovement represented at 10,000

Fig 1-Relative stylus motion at differentfrequencies at maximum recording level forfour frequencies, using the RIAA curve.

cycles is offset for much of the timeby the relatively low level of thesehigh frequencies. But, certain soundswith high impact components, suchas cymbal clashes, triangle, drum-mer's traps, a plucked steel guitar,xylophone or marimba played withhard -surface mallets, can producean extreme demand on needle move-ment. These place the greatest strain

CUTTINGSTYLUS

GROOVEWIDTHEQUALSSTYLUSWIDTH

RECORD GROOVE

TOP VIEW

III IIIII t.iffp

\rf'NCROSS-SECTION

AT RIGHT ANGLEA TO NEEDLE TRAVEL

(COMA TOM. OF RECO.)

GROOVEWIDTH

LESS THANSTYLUSWIDTH

Fig. 2-Sidewise motion of the cutter makesthe groove narrower and subsequently forcesa round stylus to rise. A 1,000 cycle sinewave even though impressed laterally, causesthe playback needle to rise and fall 2,003times.

on stylus and disc in both systems,often amounting to 2,000 times thenormal force required to move thestylus.

There has been much talk aboutpinch effect. Pinch in a monophonicrecord is actually a narrowing of thegroove width, caused by sidewisemovements of the cutting stylus,during the recording process. Whenthe relative motion between the discand cutter is straight ahead, thewidth of the groove is maximum.Thus when recording a sinusoidalsignal the groove width is maximumonly at the peaks, also when there isno modulation, as shown in Fig. 2.Because the playback needle isround, (same radius in all direc-

LARGE STYLUSPRODUCES

DISTORTEDMOTION

NEEDLEPATHS,

LARGE

VERTICALRECORDED

COMPONENT

CROSS-SECTIONLLEL TO NEEDLE TRAVEL

SMALLERSTYLUS

REDUCESDISTORTION

Fig. 3-The path of the larger stylus differsfrom the actual vertical component causingdistortion. The smaller stylus minimizes thisdistortion. Compare dotted and solid lines.

tions) it is forced to travel up anddown twice for each sine wave, or2,000 times for a 1,000 cycle signal.Provided vertical motion of the sty-lus produced no output from thepickup, this was relatively unim-portant. But stereo records usevertical motion as well as lateral(even though it may be resolved as45/45), therefore pinch effect canno longer be inconsequential. Pincheffect in stereo discs has three kindsof pickup between vertical and


Fig. 4A-Larger stylus with normal pressureis liable to bounce. (B) Increased pressureimproves tracking, but deforms the groove.

NORMALPRESSURE

GREATERPRESSURE

1DISTORTED

°' OF GROOVE

ORIGINAL SHAPEOF GROOVE


Best for

Conversion

or Replacement

COLUMBIA CD...by design the

most linear Stereo Cartridge

RESPONSE OF COLUMBIA CD CARTRIDGE

20 100 1000FREQUENCY IN CYCLES PER SECOND

+5

0

-5

10000 20000

strtrs

COLUMBIA CD LinkageIn Columbia Constant Displacementcartridges, motion of the stylus is trans-mitted directly to the two wafers thatgenerate the output voltages. This isaccomplished by a simple lever, frictionless and featherweight.The precise mechanical design assures that, regardless of fre-quency, the output voltage is essentially constant for a givendisplacement of the stylus.

Ask to hear the CD. Discover for yourself that ColumbiaConstant Displacement cartridges are designed to reproduce allthe exciting breadth, depth and realism of stereo records. Re-member, the Columbia CD was designed by CBS-Hytron'ssister division Columbia Records drawing on its over 60 yearsof recording experience. Get the best. Insist on ColumbiaConstant Displacement cartridges.

Now is the time to profit fromstereo. And for stereo conversionor replacement, Columbia CDcartridges are designed to be yourbest choice. Note the advantagesof their constant displacementdesign. Check specifications.

Ask your CBS-Hytron distribu-tor or write us for helpful freebulletins: An Introduction toStereophonic Sound, E-305; Hintson Using the Columbia CD StereoCartridge, E-306; InstructionSheet for the CD, E-289. Orderthese bulletins and your ColumbiaCD cartridges . . . today.

SPECIFICATIONSDiamond stylus 0 0008 inch radius

Recommended needle force 5 to 7 grams

High compliance.superior tracking and reproduction

Open -circuit voltage 0.5 volts

Extended stereo range, ±2.5 db....20 to 16,000 cps

Channel separation in excess of 20 db

Complete compatibility stereo and monaural

4 speeds 331/2, 45, 78 and 161/2

C B 5-H YTR 0 N, Danvers, Massachusetts

A Division of Columbia Broadcasting System, Inc.

Circle 57-01 on inquiry form page 73ELECTRONIC TECHNICIAN Stereo, 1959 57

high fidelity

recepti

demands a fine antenna. . . and the audiophile's best bet for clear, sparkling FM

sound is an AMPHENOL broadband FM antenna. Available

in two popular models, AMPHENOL FM antennas have been

carefully engineered for specific reception problems. The

114-008 "Inline-type" folded dipole and reflector offersthe unidirectional directivity pattern, high gain and me-chanical rigidity that have made AMPHENOL'S tv Inlineantenna famous. The 114-010 "Turnstile" double foldeddipole is intended for use in urban areas where thereare many FM stations. Its circular directivity patternassures efficient pick-up of such stations.

* Do it yourselfCOMPLETE KITS $16.25 each, list

NIP111141AMPHENOL ELECTRONICS CORPORATION chicago 50,illinois

58

Stereo Conversions

(Continued from page 52)If a problem of excessive vertical

rumble from the record changershould present itself on stereo pro-grams, it is possible to make thestereo pickup less sensitive to verti-cal displacement by placing a re-sistor across the two hot leads onthe cartridge. It will also be neces-sary to connect both ground leadstogether on a 4 -pin cartridge. Thestereo effect will not be materiallycompromised by this gimmick. Thevalue of this resistor can best bedetermined by experiment; 1/2 to2 megohms should do the trick inmost instances.

Extra shielding and precautionsare necessary for hum -free listen-ing. It may be necessary to try sev-eral different methods to obtainbest results. Because of the lowsignal levels at the cartridge outputand the necessary high amplificationfactors, any noise or hum that getsinto the front end of the amplifieris going to be heard. Because ofthis and the increased number ofinterconnections from one unit toanother, an undesirable groundloop may develop. In stubborn sit-uations, it may be necessary to trya different cartridge. In most situa-tions observing the rules layeddown by the manufacturer forgrounding and connecting his pieceof equipment will do.

The muting switch on a recordchanger presents a problem and thetechnician's mechanical ingenuitywill come to light. The switch nor-mally grounds the hot terminal dur-ing the change cycle and sometimeswhen the tone arm is in its restingposition. The problem stems fromthe fact that a duplicate set of con-tacts is needed for stereo. In somecases it may be possible to impro-vise another effective electrical poleby substituting a conducting ratherthan an insulating switch armature.Other switch modifications will sug-gest themselves upon inspection. Inall probability, later versions of rec-ord changers will eliminate thisproblem by incorporating a dualswitch.

Stereo is here . . . and conversionsto stereo can be difficut for the in-experienced. In the light of presentdevelopments it is worthwhile toinstall a stereo cartridge as soon aspossible. For best results, the con-version should be performed bypeople with the skills of a qualifiedtechnician.

4Circle 58-01 on inquiry form p. 73


Ar"

Have GreaterRecord Changers

11111111111

NEFamous V -M /°'

/* JA

ConsumerAcceptance

THAN ANYOTHER MAKE!

V -M HAS MANUFACTURED MORE STEREO CHANGERS THAN ANY OTHER MANUFACTURER!

The All -New V -M 'STERE-0-MATIC'A 4 -SPEED RECORD CHANGER

This is the one automatic record changer that matches all otherchangers feature for feature and then some! V -M's `Stere-0-Matic' Model 1201 comes wired for stereo with stereo cartridgeinstalled! Complete with dual output jacks and stereo /mon-aural switch $50.00 List*

SEE AND TEST THIS HIGHEST QUALITY STEREO RECORD CHANGER WITH TRUE, TRANSCRIPTION -TURNTABLE PERFORMANCE?

RUMBLE: -48 db for 120 cycle rumble when tested onXLP414 test record (recorded velocity approximately 3.4cm, sec. at 1,000 cycles.)

WOW AND FLUTTER: 1/4 RMS

TURNTABLE: Balanced to assure constant speed. Bearingmaterials and finishes controlled for minimum noise andfriction. Spindle bearing area centerless ground to reducefrictional drag.MOTOR SPEED: Constant, positive for permanent truepitch.

TONE ARM: Resonance -free. Easily adjustable for anycartridge weight. Compensated to eliminate variationfrom bottom -to -top of record stack. Jewel -type anti -frictionbearings eliminate vertical friction. Stereo cartridge in-stalled. Will accept all popular stereo or monaural car-tridges without alteration.TRACKING ANGLE: Variation reduced to a maximumof 2°.

Circle 59-0/

AUTOMATIC SHUT-OFF: Unit shuts off automaticallyafter last record plays.

RECORD INTERMIX: Will intermix changing of 10"and 1 2"records of the same speed. V -M 45 spindle fits easily overTri-O-Matic spindle for 45 rpm records.Model 1202 has 4 -pole motor and plug-in head for GEand other magnetic cartridges. All stereo leads, jacks andswitch included $50.00 List*

Both available with matching base -pan as Models 1226 and 1228.V -M -PIONEER IN STEREO-YOUR ASSURANCE OF THE HIGHEST QUALITY,

'Sbghtiv hrgh,, in the It'e,1

theoice of MusicV -M CORPORATION BENTON HARBOR, MICHIGAN

World Famous for the Finest in Tape Recorders, Phonographs and Record Changer*

on inquiry form page 73ELECTRONIC TECHNICIAN Stereo, 1959 59

FM RECEIVER(A+B) + (A -B) (A+B) + (A-8)

FRONTEND

L

0'IF

AMPLI-FIERS

Am 2nd osouDETECTOR

r

DE -EMPHASISNETWORK

-

A+B

4 FILTERDEMOD-

ULATOR

A -B

0'A-8

MULTIPLEX ADAPTER

PHASE

SPLITTER

-(A-8)

(A+B) + (A -B) r2_4/

AUDIOAMPLIFIER

AUDIO

AMPLIFIER

(A+13) -(A-8) = 28\Fig. 1-Conventional FM receiver picks up the entire multiplexed pro- 1A -BI signal can be picked off by a multiplex adaptor and fed into bothgram, but only the monophonic information (A+ Ell can be heard. The speaker systems to establish the left and right sense.

Multiplex Stereocasting

Multiplex transmission very sim-ply stated is the transmission ofmore than one program on the samecarrier. This differs from the typeof transmission found in TV. True,two programs (sound and video)are sent over one TV channel, butseparate carriers are used for each,and it is possible to tune in one orthe other. In the case of multiplex-ing, a portion of its carrier is leftclear of the main program to accom-modate a second channel withoutincreasing bandwidth. To help iden-

tify the various portions, they aretermed main carrier and subcarrier.

the TV signal it is not pos-sible to tune in the subcarrier with-out receiving the main carrier.However, it is possible to filter outthe information on the main carrierleaving only the intelligence con-tained in the subcarrier. Just as itis possible to create a so-calledsecond channel with its related sub-carrier, it is possible to subdividethe main carrier into many sub -carriers, and transmit many differ-ent programs at the same time.Some FM staions which are alreadyusing multiplex to broadcast a pro -

Fig. 2-Sum and Difference technique supplies all the information needed for monophoniclistening to the main program. The sum signals modulate the main carrier and the differencesignals are impressed on the subcarrier.

A+B

INFORMATIONMONOPHONIC

CONTAINS ALL

NEEDEDRECEPTION

A+B

FOR(A+8)

(A +8)

+ (A -B)

ADDITIVE AFMIXER AMPLIFIER

-B)MIXER

FM

MOD 4611DIFFERENCE

MIXERAF

AMR

SUB-CARRIER

A -B

MOD.

"STEREO"

SUB -CARRIER

COMPONENTON

MULTIPLEX

TRANSMITTERCARRIER

GENERATOR

gram into the home, free to thelistener, and beam a backgroundmusic program into commercial es-tablishments for pay, are consider-ing the use of a second subcarrierfor stereocasting. This would prob-ably divide the station's signal sothat the major portion of the car-rier would consist of the mainbroadcast program; the next ad-jacent subcarrier would carry theinformation needed for stereo; andthe end subcarrier would continueto provide a source of income fromcommerical listeners.

How to maintain compatibility toenable the regular FM listener toget his full quality program withoutinterference from the other portionsof the multiplexed signal, and howto avoid other problems of poorsignal-to-noise ratio, crosstalk, anddistortion for the listener of thesubcarrier portions, presented somemean problems to the broadcasters.That they have succeeded in devel-oping a workable system is verymuch to their credit. In the AM -FMtechnique of broadcasting stereo, itis necessary for each of the twochannels to contain all the programinformation. Therefore the micro-phone for each channel must, in thisapplication, be placed fairly closetogether and in the center. Thisclose spacing was also used in someearly multiplexing efforts; it goes



This is part of one of the four testing bays at University where each speaker that leavesthe factory goes through a series of exacting tests. Here we see a Model 315-C 15" 3 -wayDiffaxial being tested for frequency response. As the speaker is "swept" through the entirefrequency range, its audio output is fed via a sound box, microphone and amplifier to theoscilloscope where marker lines check that it conforms to laboratory standards within 1 db.

ALL UNIVERSITY

SPEAKERSARE

STEREO-MATCHED

within 1 db because.

Only properly matched speakers... matched toproduce the same frequency response, tonal balanceand sound output level throughout their specifiedranges ... can achieve true high fidelity stereo. "Mis-match," in the all-important directional mid andtreble ranges, can cause an unwanted shift ofemphasis from one speaker to another. "Mismatch"in timbre or tonal balance becomes especially dis-turbing where the voice or instrument actuallymoves from one channel to another ... as in opera,marching bands, or special effects. Also, the har-monic relationship between fundamentals and over-tones must be reproduced identically so that bothchannels match in tone and timbre.

That's why engineers advise you to use match-ing speakers or speaker systems for stereo-preferablythe same models from one manufacturer. But if pro-duction standards change, if tight quality checksaren't maintained, even speakers in the same produc-tion run, with identical model numbers, may be mis-matched. No problem with monaural. Bad for stereo.But a risk you need never take with University!

Every University speaker or system matches thefrequency response and sound output level ofany other of the same model within I db.

If you now have a University speaker, you areindeed fortunate, because you can go to any Uni-versity dealer anywhere and get a speaker thatmatches perfectly for stereo.

If you are planning stereo from scratch, orstarting with monaural for later conversion, Univer-sity's famous P.S.E (progressive speaker expansion)plan gives you complete loudspeaker planning flexi-bility. Start with any two wide -range speakers to fityour budget ... simply add complementary speakerswhenever you wish to achieve your ultimate aspira-tions. Whatever your choice, you can be assured ofperfect stereo performance.

...THAT'S WHY UNIVERSITYIS THE SAFEST, MOST LOGICAL

CHOICE FOR STEREO!

For FREE LITERATURF on all University speakers, speaker systems, enclosures and, kits-plus the fullP.S.E story-write Desk Z -G, 15,/,,,,sity Loud.cprO,,,, t,ir .

Kco,ico Ivenue, White Plains, N. Y

LISTEN au've/is seams 6e0A..

PERFECT

FOR MONAURAL...PERFECTLY MATCHED

FOR STEREO...

there's a Universityspeaker or system tomeet your space orbudget requirements.!


and cnrnothinwonderful h -InnrncwonderfulYou're there . . . reliving the original performance,

hearing the songs you love with a newbrilliant clarity . . . hearing the depth of life

in each musical passage. GrommesStereo is stereophonic reproduction at

it's finest . . . superb fidelitywith a new realistic depth ...bringing you truly, music

that lives.AA00

41.

Handsomely styledin gleaming gold and whiteset in a leatherette case

You be the judge . . . Your Grommes High Fidelity Dealerwill be happy to demonstrate this exciting new line ofGrommes Stereo Amplifiers.

Send me full detailson the new Grommes

Stereo Line

grOMMeS - Division of Precision Electronics Inc.

Dept. T-9, 9101 King Street, Franklin Park, Illinois

Name

Street

City Zone State

Multiplexing

(Continued from page 60)

back to the pre -stereo days whenbinaural was contemplated. The bi-naural concept was to feed each earthe same type of information aswould be heard from some theoreti-cal ideal listening point. This wasaccomplished by placing the micro-phones apart as little as six inches,which is supposed to be the distancefrom ear -to -ear on an average per-son, and then feeding this informa-tion through two separate ampli-fiers, and finally to the listener'sears via a set of headphones.

The concept of present day stereoprovides considerably more freedomand a more realistic listening con-dition in the home. No longer is it

CARRIER

// \0 15KG

MAIN CARRIER SUB -CARRIER

10 ISKC 50KC

SUB- SUB -MAIN CARRIER CARRIER CARRIER

I A. 15NC 40 KC 60KG

Fig. 3-By restricting the deviation of themain program, it is possible to leave enoughroom for one or more subcorriers to conveyadd'tional programs. Relative deviation anddistribution of energy are shown.

necessary to wear a pair of ear-phones. When the listener is sittingoff to one side of the room, it isas though he were off to one side ina concert hall; by the same tokenif he were seated in the center ofthe room, the feeling would be asthough the musicians were spreadout in front of him. In other words,stereo offers certain desirable spa-tial characteristics that binauraldoesn't.

Because it is not necessary for thestereo subcarrier to stand on itsown feet so to speak, it is possibleto take advantage of another micro -phoning technique which improvesthe stereophonic effect and stillleaves all the necessary information

Circle 62-01 on inquiry form p. 7362 ELECTRONIC TECHNICIAN Stereo, 1959

in the main carrier for monophoniclistening. Thus a listener who doesnot have a multiplex setup will stillbe able to get his FM station with-out any noticeable loss in quality.

The manner in which, this is ac-complished is quite interesting. Themicrophones can now be placed fur-ther apart and at more advanta-geous positions. Microphoning tech-niques are a study unto themselves.There are an infinite number ofpoints where they can be located,and an equal number of directionsthey can be facing. Directional char-acteristics of each microphone usedalso plays a vital roll in the stereoproduction. However, the importantthing at the moment is what hap-pens to the signals after they leavethe microphones. Fig. 2 shows howthe two signals from each micro-phone (A and B, or L and R for leftand right) are added and fed intothe main channel. This is essentiallywhat is done in monophonic prac-tice. Since all the information ispresent in this A+B signal, it is

MICROPHONES AMPLIFIERS HEADPHONES

Fig. 4-The binaural concept projects a the-oretical ideal listening point to the listener.

the one that is used to modulatethe main carrier. For the otherchannel the two microphone outputsare combined to form a differencesignal. This is not difficult; it isonly necessary to pass one of thesignals through a phase inverter.The A -B component thus developedis then used to frequency modulatethe subcarrier, which in turn isused to frequency modulate themain carrier.

The signal A -1-B is fine for mono-phonic listening, even A -B mayconvey enough information to theinexperienced ear, but A+B andA --B as such do not as yet haveany significance so far as stereo isconcerned. Something else musthappen before the right and leftsense is restored. This is readily ac-complished at the receiver end asshown in Fig. 1. By adding a portionof each signal to each stereo chan-nel amplifier, but once again chang-ing the phase of one signal in onechannel, the righthand speaker will


We aye supplyir gstandard Garra-d change -4and turntables to stereo cart-ridge nwmufacturers for tes.,purposes. Knowirg of you_interest in the trivest devel-opmenti-we reproduce, withpermission, some cf the com-ments .we have r?.ceived.

Stereo parformaite is inher-ently ez.-za-sensitive to suchsymptcrns as nimble andwow. This makes the selei",-tion of :.ecord playing equip-ment even more :fitical thanin the aut.

We ha/e testedour .cp4

cartridgerota-.1ng coils e eco

Gaairtrnard3.nucrhanger

and find that itis perfectlysuitaple for

stereoivoPirltahnYtiht% rd,-

a40, egd24

our

rset?erreedoepettoineiPr

hesitancycire noreprame in

_n -rid" for useclanger.

.., .. c .. . . . ...... c ......

7-- ---

you

think.4eauec

to

Garrard

'.. ." .will

2110 ehelaSeVe

changersGarrarcl Modeland301 -turn tablesin these testseand thatresults havebees

iseSvuePrYerircv-3-Fge:.

...; .5://PWar el stnenC47St

For all recordT-stereo and monaural

insist on

There is a Garrard forevery high fidelity

system. From$32.50 to

Ar's $89.00.

Circle 63-01 on anqulky form p. 73

-a


Stereo Tape and Tape RecordersNew Materials, Techniques, And Developments Assure

The Tape Recorder A Prominent Position In The Hi Fi System.

Tape was really the first mediumto find fairly extensive acceptanceas a source for stereo programs. Thiswas a natural development. Record-ings were first placed on tape beforetransferring to disc for some time.The record companies found it use-ful to simultaneously record severaldifferent tracks from individualmicrophones placed in different po-sitions and then blend them togetherlater to obtain an optimized effectfor transfer to the disc. This means

TRACK

TRACK

I I-

STAGGERED HEADSALLOW MORE ROOM

FOR GENEROUS SUE HEADS

_

STACKED HEADSPLAY TRACKS SIDE-SY-50f

AND ARE COMPACT

Fig. 1-Staggered and stacked heads as usedin tape recorders. Some machines have both.

the record companies' master tapes,by accident or design, are already ina stereo form. As progress in stereodevelopment went forward, it be-came evident that the new mediumpresented a potential for later re-lease of the same monophonic pro-grams in stereo.

The development of half-tracktape (two tracks on one tape) as asource of extra -long-playing pro-gram material opened the way forusing both tracks in the same direc-tion and putting two -channel stereoon them.

While there is no doubt that tapes,made and transcribed on really topquality machines, can yield betterquality than discs, the scaled downprerecorded tapes played on lowpriced tape players or recorders,have had a tough time competingwith discs for quality in similarlypriced systems, although they have

always had the advantage of longeruninterrupted playing time. This re-duction in quality was forced by thequestion of economics in both tapeand recorder cost.

Record masters have mostly usedat least 15 inches -per -second (ips),and often wider than the standard1/4" tape, to get the best possible dy-namic range and quality. Prere-corded tapes have been transferred,by high-speed multiple -copying ma-chines onto 1/4" tapes with two 71/2ips tracks. Higher quality results at71/2 ips, but the appeal of the longerplaying time at lower cost will un-doubtedly encourage the trend to-ward 33/4 ips. Most machines willrun at either speeds.

This "stretching" of tape, gettingonto narrower tracks, and running atslower speed, has not resulted en-tirely in proportionate loss of qual-ity, because the head and tape man-ufacturers have been busy too. Theyhave come up with products thatutilize the lower speeds and nar-rower widths much more effectively.It is reported that a half-track 71/2ips tape, recorded and played withtoday's best heads, is at least as goodas yesterday's full -track 15 ips tapes.

Head ArrangementsStereo presented a problem of how

to arrange the two heads. In theearly days materials and productiontechniques necessitated a fairlybulky head to get the best qualitywhich led to the use of staggeredheads. Because of tape stretch andother mechanical tolerances, it wasobviously more logical to have bothtracks run side -by -side, in time aswell as place to avoid phasing prob-lems. So another group preferredstacked heads. Both types are shownin Fig. 1. At present the stackedgroup seems to have had the bestforesight. Techniques for makingheads has improved to the pointwhere just as good quality can be

obtained from the stacked arrange-ment. Some recorders have pro-vision for playing both.

To keep pace with the competitionfrom the new stereo discs, to makethe use of tape more economical, andto further the art, the tape engineershave been working on quarter tracktape for stereo. Before, there weretwo tracks on a 1/4" tape, whichcould be used separately for mono-phonic channels or together forstereo. The four channel tape shownin Fig. 2 will accommodate two sep-arate two -channel stereo programs

FULL TRACK

)1.ONE war

HALF TRACK QUARTER TRACK

TWO WAYS FOP MONO .44*

FD-UR WAYS FOR MONS

ONE WAY FOP STEREO TWO WAYS MRS'E'f°

Fig. 2-Progressive development from theoriginal full -track tape to half-track, and nowto the new quarter -track, which can beplayed stereophonically in both directions.

or four single channel recordings.All other things being equal, thiswould again result in a deteriorationof dynamic range. But again produ-tion methods, both on tape andheads, continue to develop and itmay result in no deterioration incomparison with former one-waystereo tapes.

A recently introduced tape cart-ridge (all tape wound inside thecartridge) using a four track, 1/4",600', tape at a speed of 33/4 ips, re-duces the amount of manipulationrequired to set up, and eliminatesconventional reels and the need forthreading. Tracks 1 and 3 are usedfor stereo play in one direction, andtracks 2 and 4 in the other. Auto-matic and semi -automatic machinesto handle these tape magazines orcartridges have been demonstrated.At this time only a limited number


of cartridge machines are on themarket. Sound quality is said to beas good as the two -channel tapes.

One of the big attractions to taperecorders, is the ability to make re-cordings. Most of the earlier stereosystems could be converted to, orwere provided with facilities forplayback but not recording stereo.A number of the newer releaseshave provision for recording stereo.Home stereo recording requiresmore know how. Most recordingswill probably be made in the livingroom. The average living room re-quires a very different techniquefrom that used in stereo recordingstudios.

Two directional type microphonesare desirable. A pair of qualitycardioids can give very good results.The microphones could then be di-rected toward different parts of theroom, group, piano, etc. Because thedirectional effect in sound is due toeither a difference in sound intensityor a phase difference, and becausein the average size living room thereis only moderate difference in soundintensity when a person is speakingfrom a few feet away or from the op-posite side of the room, it is essentialthat the microphones have good di-rectional characteristics for goodstereo effect.

In an auditorium or other fairlylarge area, there may still be someadvantage to using directional micro-phones, but good results can be ob-tained with the ordinary, mostlyomnidirectional, types usually fur-nished with the recorder.

Techniques will vary with eachset-up. If possible it is a good idea toconduct a few trial runs before at-tempting to record a formal pro-gram. Theoretically, the micro-phones should be placed in the sameposition and same spacing as the earsof an ideal listener; but because ofthe absence of certain psychologicaleffects, including the inability to seethe performers or their instrumentswhen the, recording is played back,wider spacing of the microphoneswill help create the stereo effect. Adistance of about 3 feet may be agood start. When recording pianomusic, it may be possible to place amike on each side. Thus one willpick up the bass while the other willreceive the sound from the treblestrings.

If the mikes are placed too farapart, "ping pong" and other unde-sirable effects may be encountered.As a general rule, directional micro-phones may be placed closer to-gether while omnidirectional typeswill create a better stereo effect ifplaced closer to the dominant endsof the sound source.

offers you a Complete and Universal line of

FULL FIDELITY NEEDLES DIAMOND

SAPPHIRE OSMIUM

Now, one complete line of precision -engineeredand custom -designed needles to fit everymake and model phonograph and HighFidelity receiver. Every Philco needle measuresup to the highest quality and life test stand-ards. All Philco needles are individuallypackaged for absolute protection.

PHILCOpHOMOGRAPN NEEDLES

PHILCO FIDELITAPEwill bring new customers into yourstore. Unequalled in uniformity ofoutput. Guaranteed splice free. Extrastrength and extra length.

See Your PhilcoDistributor Today !

p 114ILCO

ptut.C.0

FREE! NEEDLE COUNTER DISPLAY!

Ask your Philco Distributor howyou can get this sparkling, jewelcase needle dispenser free. It's asales -maker for you right onyour coulter at the point of sale.

COMPLETE PH LCO NEEDLE CATALOG

The most accurate, up-to-date, easyto -read needle catalog in the industry.Cross references are complete ...Illus-trations are big ... Makes selling easy.

P1-111.00

World -Wide DistributionService Parts Power -Packed Batteries Universal Components Long -Life Tubes Heavy -Duty Ro ors Star -Bright 20/20Picture Tubes Lang -Distance Antennas Appliance Parts Laundry Parts Univer-sal Parts and Accessories

Circle 65-01 on inquiry form p. 73ELECTRONIC TECHNICIAN Stereo, 1959 65

STEREO EFFECT

DUE TO.BEAMING-OF

HIGH FREQUENCIES

AREAOF

TRUE'STEREO

Fig. 1-Two speakers in one enclosure,angled away from each other can createpleasing stereo effects even when the listeneris not seated in the true stereo area.

Speaker

AREA OF" TRUE" ST EREO

NO -RANGE FREQUENCIES CONTRIBUTEMOST TO THE STEREO EFFECT IN THIS AREA

Fig. 2-Separate speaker sys-tems are more desirable particu-larly for larger listening areas.

NOR

LIVINGROOM

2nd CHANNELA TWEETER

If MID -RANGE

ONE CHANNEL]

MAIN WOOFER

LT GE RE

virMTIDW-

E

ARCH WAR

DINING ROOM I HITCHES

Fig. 3-Multiple speaker system arrangedso that the high frequencies are projectedalong the sides of the wall while themidrange is aimed at a central rearwardportion of the room. Because of spacelimitations only one woofer is used atpostion A to furnish the necessary bass.

Arrangements For Stereo

A good general rule to use as astarting point is that the smallerliving room, up to 12 feet by 14 feet,can be served by two enclosures ora single enclosure type of stereo-phonic speaker system, with thespeakers sufficiently separated andpointing outwards as shown in Fig.1. For larger rooms it is better toarrange two separate enclosures andtheir speakers along the shorter wallof the room as shown in Fig. 2.While corner placement is desirable,it isn't absolutely necessary. Theshaded portion indicates the socalled true stereo listening area. Thedirection or angle of the speakers isalso important. Generally, the highfrequencies should be directed downthe sides of the room, and perhapsa bit toward its adjacent side wall.This helps to get the higher fre-quencies into portions of the roomwhere the true stereo effect is notrealized, but will nevertheless helpto create a pleasing stereo illusion.Angling the woofers so that it coversthe central listening area offers the

same advantages, and for the samereasons, found in monophonic hi-fipractice.

This is an easy basic rule, but inactual practice modifying andadapting to suit the circumstancesof individual living rooms will berequired. Room shape, furnishings,and position of doors, windows, etc.,will often make it impossible toadopt the ideal speaker placementand listening positions.

To provide the foundation for ap-proaching any particular installationso as to make the best of the cir-cumstances, it is necessary to knowjust what it is that stereophonicsound has to do. Many conflictingstatements have been made by dif-ferent authorities on just how ster-eophonic effects are really achieved,so differences of opinion are inevi-table.

Practical experimentation hasshown that the bass frequencies(below about 250 cycles) do not inthemselves contribute anything tothe stereophonic effect. However,sounds below 250 cycles do have asense of direction, but it is due totheir harmonics and other compo-nents which are above this range.

These low frequencies are the onesthat require the larger speakersand enclosures. However, in smallrooms, speakers using the acousticsuspension principle have the ad-vantage of smaller enclosures andgood bass response. If there is onlyone good corner location, or a po-sition where a bass reflex or othertype of enclosure, which can do agood job of reproducing the lowfrequencies, it will be quite in orderto use a smaller speaker for thesecond side without attempting toget too much bass out of it. Bassfrequencies referred to are thosebelow 250 cycles. Provided adequatebass is fed into the room from atleast one of the speakers, the ster-eophonic illusion or effect will besatisfactory.

If this method is used, it is well toemploy a multi -speaker system forthe side that delivers the bass,preferably with a turnover in theregion of 250 cycles, and certainlynot higher than 350. This enablesthe woofer to concentrate on thelow notes and permits the midrangeand tweeter, speakers to performthe function of delivering the stereoeffects with maximum efficiency.


This range from 250 to 1,500cycles may be termed the range oftrue stereo. It is this range of fre-quencies that conforms best to thetheory of stereo. But this does notmean that it is only necessary toconcentrate on getting only 250 to1,500 cycles. Frequencies above andbelow this range are also importantfor getting good stereophonic repro-duction, but for different reasons.

The so-called true stereo effect ismost critical of listening position.If the midrange frequencies only

CHANNEL

PREAMP

ST REOINPUTS

(TAPE:.5010

CHANNEL

s2HEMP

ELECTRONIC

CROSSOVER

250,,

ELECTRONIC

CROSSOVER

250,,

DROVE

1.0w250

CHANNEL#1

AMP

CHANNEL

2

AMP

00FER

AMP

TO CHANNEL#1

MID -RANGE

& TWEETER

TO CHANNEL

*2MID-RANCE

TWEETER

TO SINGLE

WOOFER

Fig. 4-Electronic crossover removes thebass component from each channel andfeeds it into another amplifier andspeaker system to form a third channel.

were present, the stereo effect wouldonly be achieved in the shaded areasin Figs. 1 & 2. But, still other effectscontribute to the desired stereo il-lusion, much more than many peo-ple seem to realize. The distributionof the high frequencies, those above1,500 cycles, can help considerably.

This can be demonstrated by thearrangement shown in Fig. 1. Thestereo effect in this case is obtainedby beaming the high frequenciesfrom each channel directly at theadjacent side wall. Thus one groupof high frequencies is comingtoward the listener seated off to oneside, while the other group of highfrequencies is directed away. Thisgive an overall effect, at positionsoff -center, very similar to sitting atone side of a concert hall. By thismeans a very real sense of perspec-tive is retained even though the truestereo effect which is dependentprincipally upon the mid -range fre-quencies is lost when not in thecenter of the room. The general ef-fect of a speaker system of thistype in a smaller room, with areasonable degree of furnishing, canbe quite pleasing.

Typical ProblemsIn the first place it is necesary to

know how much one is prepared tospend. Then it can be decidedwhether to get single extended -range speakers or multiple -unittypes. With a good extended rangetype speaker, the stereo effect basedon the mid -range frequencies must

be depended upon, because extendedrange units tend to scatter the highfrequencies in a rather indetermin-ate fashion compared with mosttweeters. On the other hand themultiple speaker systems can beused to make the best of some awk-ward listening room conditions or toextend the useful listening area.

To better understand the applica-tions of these principles, considersome of the more difficult but notunusual situations. This fairly largeliving room has a relatively largeopening in the shorter wall leadinginto the dining room, as shown inFig. 3. A corner type enclosure witha multiple speaker system could beplaced in the position marked A.Then the most desirable position forthe second speaker would be some-where in the vicinity marked B. Butthere is very little room to put aspeaker here; certainly not a largecorner or wall type enclosure. Thecorner type would project into theopening, while the wall type, with itsback against the wall, would projectthe sound in the wrong direction.This location calls for a muchsmaller speaker -enclosure arrange -

CHANNEL

1

AMP

CHANNEL

AMP

ELECTRONIC

CROSSOVER

250,

ELECTRONIC

CROSSOVER

250,

TO CHANNEL*I

MIO-RANGE

A TWEETER

TO CHANNEL*2

MID RANGE

A TWEETER

TO SINGLE WOOFER

Fig. 5-If the crossover network is insertedbetween the amplifiers and speakers, it ispossible to avoid the use of a third am-plifier, and still have the third channel.

went. It now becomes a case for thespeaker positioned at A to furnishall the bass. It is possible but notnecessary to elaborate on this sys-tem by combining the bass fromboth channels using a couple ofelectronic cross-overs and feedingit to the woofer. Thus relying en-tirely on the separation of those fre-quencies above 250 cycles for eachchannel, to get the stereophonic ef-fect, as shown in Fig. 4. This hookupshows three amplifiers. It can bedone with two amplifiers by insert-ing the crossover network betweenthe amplifier for each channel andthe speakers as shown in Fig. 5.The midrange speakers should bedirected so that the true stereo ef-fect, is achieved in the central partof the far end of the room. The highfrequencies from the tweeters couldbe directed to cover the areas notproperly covered by true stereo

Therefore, the midrange speakersshould be aimed toward the middleof the room, a little more towardthe rear, while the tweeters shouldbe aimed down the sides of theroom. In some speaker arrange-ments it is posible to adjust theangle of the speaker at any time tosuit the program material and seat-ing arrangement. In some installa-tions where the speaker enclosureitself is sitting inside another pieceof furniture, it is possible to anglethe enclosure wthout upsetting thestraightforward look.

An extra large living room havingtwo openings at one end and win-dow space at the other, as shown inFig. 6, may be placed so that thespeakers are against the narrowwall as shown, or against the win-dow area, depending upon furniturearrangement. There are several goodspeaker arrangements. One way re-quires three speakers. The middleand high frequency range, is coveredby the units in the corners. This isan advantage in that normally onlyrelatively small speakers can beused in these spaces. The low -frequency unit should be placedagainst the wall between the othertwo speakers. One of the crossovernetworks just described should beused. If this room had a centeropening on the shorter wall andmore corner space, an ideal arrange-ment would consist of two properlybaffled full range speaker systems.

The use of the third speaker inthe center opens the way for con-siderable debate on the best ap-proach or technique to use. The

Fig. 6-A large room using widelyspaced speakers may require a thirdspeaker in the center to improve theoverall stereo presentation and mini-mize the "hole in the middle" effect.

PICTURE*I500'.

SEPARATEMID -RANGE

E. TWEETERSFOR EACH CHANNEL

SINGLEWOOFER


MICROPHONESlisted in our new catalogIN EVERY PRICE RANGE!FOR EVERY APPLICATION!

for example-the versatile DR330 DynamicCardioid and Ribbon

with multiple impedance and cardioid,bi-directional, and omni-directional polarpatterns. A handsome unit made to fulfillthe most exacting requirements of radio-tvbroadcasting and film recording. Smoothfrequency response from 30 to 15,500 c.p.s.List Price $250.00.

DR332 Dynamic and Ribbon CardioidProfessional model with cardioid polarpattern and variable impedance. Frequency response 40-13,000 c.p.s.List Price $162.50.

for example-the handsome D22 Omni-directional Dynamic

Smooth peak -free response from 40 to13,000 c.p.s. means you virtually eliminatefeedback problems and get wonderfulsound reproduction of both voice andmusic. "Slide -Lock" permits easy removalfrom stand for hand or suspension use.Variable impedance. List Price $99.50.

for example-the low cost 204 Series Tape

Recording -Conference Microphones

Sleek, modern, and versatile, with widefrequency response (from '70 to 10,500c.p.s. in the crystal model). Also availablein ceramic and dynamic types. High orlow impedance. Push button allows "Selec-tive Recording." List Price from $16.00.

Write for your free copy of the handsome newAMERICAN MICROPHONE catalog, giving completespecifications on these and other fine AMERICANmicrophones, handsets, cartridges, and tone -arms.

MANUFACTURING COMPANa division of GC -Textron Inc.

West Coast Plant: Los Angeles 18, CaliforniaMAIN PLANT: 422 SOUTH WYMAN STREET, ROCKFORD, ILLINOIS, U.S.A.Export and Canada: Tel esco International Corporation, 36 W.40th St., New York,N.Y.

Circle 68-01 on inquiry form p. 73

center speaker can be used to elim-inate a "hole in the middle" effect.Wide spacing between the speakerson each end to accomplish evengreater directional characteristicsamplify the problems of the hole inthe middle. Since it is generallyconceded that the base frequenciesdo not have directional qualities,one school of thought is that thelogical place for the third speakeris in the center and that it shouldfurnish the low notes. This leavesthe end speakers to provide thetrue stereo effect. Still anothergroup of engineers believe that athird channel in the center con-taining bits of information fromeach of the end channels will notonly take care of the hole in themiddle problem, but that it createsa better relationship between cen-ter stage and the other areas with-out detracting from the overallsense of lateral spaciousness be-tween one end of the stage and theother. Fig. 7 illustrates one way totap off the third speaker so that itcan provide this information. Itshould be noted that the centerspeaker in this application does nothave to carry any appreciableamount of bass.

The L-shaped room found inmany modern homes, seemingly has

Fig. 7-Another convenient way te estab-lish a third channel. While this method doesnot odd anything to the bass response, itdoes improve the directional sense with re-spect to the center of the program source.

its share of problems. One solutionis to use the principle embodied inthe single enclosure, full rangespeaker systems.

Two wide -range multiple speakers(or good extended range speakersif the budget dictates) are placedin the positions shown in Fig 8. Theobject is to have one channel feedeach major section of the room. Inthe central area of the room thetrue stereo effect is realized. Inother positions the effect is of listen-ing directly to one speaker andhearing the other one playing in an-other room. With proper balance


this can be quite an effective wayof presenting stereophonic sound ina rather difficult situation.

If a room has plenty of carpetingand upholstered furniture it will notproduce many undesirable reflec-tions, and full use can be made ofa wide -range system. Recreationand other rooms having linoleum ortiled floors, painted walls and per-haps wrought iron furniture, rever-beration can be quite a problem. Infact, it becomes difficult to present

/STEREODUE TO

SECONDARYANO

EFFECT

Fig. 8-The problems of the "L" shapedroom can be overcome considerably by us-ing two wide -range multiple speaker sys-tems. Good extended range speakers may do.

a good stereo effect in a room likethis, because of the way the soundbounces around.

In such a room a good extendedrange loudspeaker may be the bestone to use, because the high fre-quencies will do little if any good.Much more care should be given tocareful angling of the units to avoidbouncing the sound directly backfrom the opposite wall. Face thespeaker units so that the sound hitsthe opposite wall at an angle. Ingeneral it might be better to con-sider another room for listeningto stereophonic sound. Recreationrooms are not necessarily the bestlistening places for high fidelitystereo or monophonic programs.

Speaker MatchingA question often asked is whether

or not to continue using an existinghigh fidelity speaker. This bringsup the question of matching speak-ers. The answers depend on thetype of existing speaker. Two ofthe large complex type speaker sys-tems each using a fairly widely sep-arated midrange and tweeter as

look what

'2895buys in

high fidelityequipment!

A complete 12 -watt hi-fi ampli-fier -preamplifier combinationin one stylish unit .. andat less than half the priceyou would expect to pay!

Only

$28.95

EATHKIT

Manufacturerof the finestelectronic equipmentin kit form

BOOKSHELF 12 -WATT AMPLIFIER KITAn amplifier and preamplifier in one compact unit. The EA -2 has more thanenough power for the average home hi-fi system and provides full range fre-quency response from 20 to 20,000 CPS within *1 db, with less than 1%harmonic distortion at full 12 watt output over the entire audio range (20 to20,000 CPS). IM distortion is less than 1.5% at. 12 watts with low hum andnoise. EL84 tubes are used in a push-pull tapped -screen output circuit. Inputsconsist of crystal phono, tuner, and mag phono with RIAA equalization.Separate bass, treble and hum balance controls are featured. Taps providedfor 4, 8 and 16 ohm speakers. Add this unit to your present system for simplestereo conversion. Complete instructions and pictorial diagrams show whereevery part goes and assures you of quick, easy assembly. Handsome vinylclad steel cover measures 121/2" W. x 83(6' D. x 43' H. Neon pilot light onfront. Shpg. Wt. 15 lbs.

many more kitsto choose from!

Send for this free catalogdescribing over 100easy -to -build kits inhi-fi-test-marine andamateur radio fields.

CPS.

HEATH COMPANYBenton Harbor 18, Mich.

bsidiary of Daystrom, Inc.

...

name

address

city & state

JCircle 69-01 on inquiry form p. 73


used in some hi-fi installations, arenot advisable for stereophonic pre-sentation. They confuse the soundtoo much. It is better to use thewell -integrated type. It is particu-larly important for the mid -rangeand tweeter units to be as close to-gether as possible. Even in the ex-ample illustrated in Fig. 3, wherethe tweeter is directed along a dif-ferent line from the mid -range unit,they should be mounted close to-gether so that the areas fed by theseunits will not receive the impres-sion of any noticeable separationbetween the sounds from its partic-ular channel.

Another important considerationis the question of speaker phasing.First, it is particularly important tohave the speakers in the same en-closure correctly phased so there isno dissociation effect at the cross-over frequency. This can best bechecked by playing a single channeland listening critically. Connect thetweeter first one way, then another.Listen for smoothest response andthe best sense of integration. Useprogram material such as a solovoice. The same method can be re-peated for the woofer and mid-range. Here particular attentionshould be given to the smoothestfill-in of frequencies around 250

SOLOIST SHOULDSOUND HERE

0 ,

EQUAL DISTANCE

`A LISTENERSTANDHERE

Fig. 9-A soloist's voice will appear tocome from the center when the speakeroutput is properly phased and balanced.

cycles, or whatever crossover isused.

If multiple speaker systems areused in each channel, it is essentialthat each bank of speakers in thechannel be properly phased beforeattempting to check the phase ofthe overall stereo system. A simplemethod is to try reversing the con-nection to any one channel's speak-ers to discover which gives the bestsense of position for solo program.Select a program where the soloistis intended to be approximately inthe middle, and listen from a centralpositions as shown in Fig. 9. Thething to listen for when the two

speakers are operated at the samelevel is the soloist's voice. It shouldappear to come from a point mid-way between the two speakers. 'Ifthe sound seems to get lost in theroom, try reversing the connectionsto one speaker. If the system useswoofers in both channels, the lowfrequencies can also be helpful, ifeach channel is correctly phasedwithin itself.

Contrary to instructions on phas-ing which have appeared in printfrom time -to -time, speakers foreach channel of a stereo systemshould be phased when listening tothe desired stereo program, and notwith batteries or monophonic mate-rial played over both channels si-multaneously. This is particularlysignificant if due to the use of dis-similar amplifiers, preamplifiers or ifconditions of program material aresuch that the two channels are notin phase going into the amplifiers,the program fed to the speakers ineach channel are out of phase. Tocorrect this condition, it is simplya matter of reversing the leads go-ing from one amplifier to its speaker.This may make the speakers out ofphase in the "battery test" sense,which is exactly opposite to the cor-rect phasing situation for conven-tional monophonic listening.

STEREO PROFITS START HERE

Compatible with both stereo and monaural records Full frequency response, 20 through 20,000 cycles "Floating armature" design for increased complianceand reduced record wear. Effective mass of stylus ap-proximately 2 milligrams High compliance in alldirections-lateral compliance 4 x 104 cm/dyne; ver-tical compliance 2.5 x 104 cm/dyne Recommendedtracking force with professional -type tone arm 2 to 4grams Consistently high separation between channelsignals. (Specifications for Model GC -5.)

New G -E "Golden Classic"Stereo -Magnetic Cartridge

4q

Easier to sell... because it's magnetic... and because it's G -E!

Stereo installations and conversions can open up a whole newfield of profitable business for you. And you can start yourcustomers converting to stereo right now-with G.E.'s new"Golden Classic" stereo -magnetic cartridge (fully compatiblewith LP monaural records). It's easy when you tell them how amagnetic cartridge can best provide the high compliance, lowdistortion, and channel separation required by the new stereodiscs. Just as important, General Electric is the name all yourcustomers know and trust.

GENERAL ELECTRICSpecialty Electronic Components Dept., W. Genesee Street, Auburn, N. Y.


Changers & Turntables For StereoLower Recording Level, Vertical Rumble & Arm Consideration

The controversy of record changervs. turntable now has a new slant,with the advent of stereo. The argu-ment for the turntable is the one ofsimplicity. Where the objective issmooth motion without flutter, wowor rumble, a simple mechanismshould stand the best chance ofachieving the ideal. The argumentfor the record changer is that it doeswhat a lot of people want it to do.Expert design, close quality control,coupled with precision methods,have provided record changers andturntables whose performance isquite satisfactory for stereo pur-poses.

Some high fidelity enthusiasts willnot look at changers for another rea-son; they want to keep up with thelatest developments in tonearms andpickups. The changer is not readilyadaptable for use with a variety ofarms. One major advantage theturntable has at the moment is the

ability to operate with lower styluspressure, but the changer people areworking on this and have made someprogress.

As quick as a problem is recog-nized, that is how fast the engineersand manufacturers set about tryingto lick it. The sensitivity to the verti-cal component as found in stereopickups, has spurred all facets ofthe record player industry into ac-tion. Improvements already incorpo-rated and some yet to come in thechanger and turntable field indicatethat the relative merits and argu-ments for the changer and turntablewill stay in about the same perspec-tive.

Flutter, Wow, RumbleFlutter and wow show up exactly

the same on stereo as they do onmonophonic records. Rumble, on theother hand, has another chance ofbreaking through in stereo. With a

monophonic pickup the only form ofvibration normally picked up is in ahorizontal direction.

Since stereo pickups are sensitiveto both vertical and lateral vibra-tions, rumble components now be-come a more important factor.

To help offset this problem, someof the new stereo pickups include anacoustic, or mechanical filter, toavoid picking up low frequencyvertical components. This is per-missible because in any legitimatestereo disc recording the low fre-quencies are essentially in the lateralgroove motion. Losing the verticalcomponent at low frequencies shouldnot materially deteriorate the stereoeffect, and it does filter out somevertical rumble.

Recording LevelIt is more difficult to obtain the

high percent of modulation that haslately been impressed on most

for CUSTOM HI -Fl installations your best buy is /10' PRAISED BY THE EXPERTS 0" PRICED RIGHT FOR YOUR PROFIT

Po LIFETIME GUARANTEE on SERVICE & ADJUSTMENT

EICO FM TUNER HFT90 withprecision "eye-tronic" tuningKIT $39.950 Wired $65.95°.Less Cover, FET incl.

EICO PreamplifiersHF65A KIT $29.95, Wired $44.95.with power supply:11F65 KIT $33.95, Wired $49.95

HF61A KIT $24.95, Wired $37.95with power supply:HF61 KIT $29.95, Wired $44.95

"(The EICO FM Tuner provides) . . . noncritical tuning, low capture ratio (6db),close -station separation, and insensitivity todrift which are unique among FM tuner kits,to the best of our knowledge . . . one ofthe best buys you can get in high fidelitykits." - AUDIOCRAFT Kit Report.

"(The EICO Master Control Preamplifier's)performance rivals that of the most ex-pensive preamps . All in all, here Is anexample of a high level of engineering skill,which has managed to achieve fine per-formance with simple means and low cost."

- Joseph Marshall, AUDIOCRAFT.

Concerning the EICO 60 -watt Power Ampli-fier: "Listening tests confirmed the fineinstrument test results without question. OurHF-60 produced firm, well-defined bass andclear, sweet treble on the finest speakersystems available. It clipped momentaryoverloads very well and recovered quickly,and this gave listeners the impression oftremendous reserve power. In our opinion,it is one of the best -performing amplifiersextant; it is obviously an excellent buy."

- AUDIOCRAFT Kit Report.

"We believe the EICO HF 52 (50 -watt Integrated Amplifier) should prove highly satis-factory for home music systems requiring a50 -watt amplifier. At its price, either in kitform or assembled, it represents an ex-cellent value."- Hirsch -Houck Laboratories.

"For those who have been looking for a well -engineered yet inexpensive power amplifier,the newly -released EICO Model HF-20 unitmight offer a simple solution to their prob-lem. Not only does this unit provide 20 wattsof power but the circuit incorporates a pre-amplifier and a variety of controls on asingle chassis."-William A. Stocklin, Editor,

RADIO & TV NEWS.

". . . the EICO Standard (Speaker System)proved able to create a remarkable illusionof realism from all types of program mate-rial ... String tone was reproduced with asmooth, gutty richness . . .Bass transientswere well handled . . . never any sensationof two sound sources; the speakers blendedfaultlessly . . . an eminently musical repro-ducer ... the EICO's compactness and dis-persion characteristics would suggest un-usual suitability for stereo application."

-J. Gordon Holt, Technical Editor,HIGH FIDELITY.

EICO Stereo Preamplifier HF85KIT $39.95 Wired $64.95

k

EICO Stereo Amplifier -Preamplifier HF81KIT $69.95 Wired $109.95

' PR © 1950, ELECTRONIC INSTR. CO.. INC., 31-00 N BLVD 9 14 N.

'

EICO 60 -Watt Ultra -LinearPower Amplifier HF60with Acro TO -330 OutputTransformerKIT $72.95 Wired $99.95

NAME

ADDRESS

CITY ZONE STATE

EICO 50 -Watt Ultra -LinearIntegrated Amplifier HF52KIT $69.95 Wired $109.95

4EICO 20 -Watt Ultra -LinearIntegrated Amplifier HF20KIT $49.95 Wired $79.95

EICO StandardSpeaker SystemHFS2

Completelyfactory builtMahogany orWalnut, $139.95Blonde, $144.95

INSTOCK !datislt r9i ObOu trioerisgchobaosrth dcoast.

EICO, 33-00 Northern Blvd. ET -9L. I. C. 1, N. Y.Show me HOW TO SAVE 50% on top- E.quality equipment checked: 0 HI -Fl Ln

0 TEST INSTUMENTS 0 HAM GEARSend FREE literature and name of -.neighborhood EICO supplier.

0ID

1.1

ELECTRONIC TECHNICIAN Stereo, 1959Circle 71-01 on inquiry form p. 73

71

Convert ANY Phonograph to

TEREwith FANON

LOW-COST Conversion Kits Adapts Phono for both Stereo or Monaural. Improves Sound Quality of Monaural Records. Second amplifier -speaker system adds depth.With the big boom in stereo records and stereo phonographs, you can bring anyhi-fi record player up to date to play both monaural and the new stereo records.Simple to install, the new Fanon Kits offer you top fidelity for the most economicalchangeover today. Speaker -amplifier unit alone can be used with tape recorders,tuners, etc. Your customers get more for their dollars with Fanon.

-4111110---

FANON STK-5High fidelity 5 -tube push-pull amplifierwith one 8" woofer and one 3" tweeterin smartly designed two-tone cabinet.Separate bass, treble and volume con-trol for second channel. High fidelityceramic turnover Stereo cartridge,mounting accessories, phono jack and15 feet of extension cable included inkit.

ONLY $4995 ListSpeaker -amplifier -cable unit

(Model ST.5) $41.95 List

4ix fibw,s4e,-4111110

For complete specifications andinstallation instructions write now.Ask about Fanon's complete selection of Stereo phonograph systems, too!

FANON STK-4Complete high fidelity three tubeamplifier system with two 4" phasedspeakers in handsome two-tone fashion -fabric cabinet. Separate bass, trebleand volume controls for second chan-nel. Kit includes hi-fi ceramic turn-over stereo cartridge, mounting acces-sories, phono jack and 15 feet of ex-tension cable to unit.


(Model ST -4) $31.95 List

FANON STK-10Beautifully finished, hand -rubbedmahogany, walnut or blonde cabinetcomplete with same quality compon-ents as in STK-5 above. Kit includeshigh fidelity ceramic turnover stereocartridge, accessories, phono jack and15 ft. extension cable. Ideal for con-verting consoles.


(Model ST -10) $51.95 List

FANON ELECTRIC CO., INC.Dept. E-9. 98 Berriman St., Brooklyn 8, N. Y.In Canada: Active Radio & TV Dist., 58 Spadina Ave., Toronto

monophonic records, onto the newstereo recordings without runninginto much more severe distortion.Consequently the stereo records sofar released are recorded at lowerlevels. From a compatibility view-point this level difference has somejustification because the addition ofthe stereo quality to a presentationmakes it seem louder than the samelevel played over a single channel.

Because the lateral component ofa stereo record is recorded at lowerlevel, a given amount of rumble willbecome correspondingly more no-ticeable. In some instances this canmean the difference between rumblethat was not heard and its becomingobjectionable. So some units thatmight have rated as acceptable formonophonic use may not be quitegood enough for stereo.

Arm PivotsAnother factor that affects arms,

whether on record changers or turn-tables, is the matter of pivot friction.Stereo records use smaller styli.Smaller styli mean that a given sty-lus pressure produces more wear.The minimum stylus pressure is de-cided by the pickup design. But ifthere is any appreciable friction inthe arm pivot, the stylus pressuremust be increased.

So, with the exception that verticalcomponents of rumble vibration nowassume a much greater importance,the effect of stereo's advent on arms,changers and turntables is mainlythat the already rigorous require-ments become just a little more so.Undoubtedly this will stimulatefurther improvements in each kindof equipment, but most of the exist-ing models can be used for stereo.

As we go to press . .

General Electric AMPLIFIERSMS -4000 dual channel preamp/amplifieris rated at 20 watts/channel, 20 to 20,000cps ± 0.5 db, harmonic distortion 1%,hum and noise - 73 db on high levelinput, and - 40 db channel separation.

Tape, phono and tuner inputs. $169.95.Also, not shown, MS -2000 dual channelpreamp/amplifier, similar specifications,except 14 watts/channel, $129.95.


FREE LITERATUREEvery company advertising in STEREO 1959 has literature available on its

products. In order to save you the trouble of writing to each company in-

dividually, a simplified coupon reply form is included below. Upon receipt

of your coupon, we will route your name and address to those companies

whose literature you desire. Note that each company's advertisement has

Acro-94-01Page 94-Acrosound ultra -linear II 60 -watt amplifier,wired or kit

American Microphone-68-01

Page 68-New catalog avail-able covering microphones inevery price range

Amperex-93-03Page 93-Low noise audiotubes, such as ECC83, sub-stitute for 12 AX7

Amphenol-58-01Page 58-Broadband FM an-tennas, "Inline-type" and"Turnstile"

CBS-Hytron--57-01Page 57-New Columbia CDstereo cartridge for conver-sion or replacement

Collaro-46-01Page 46-Record changer,engineered to meet rigid de-mands of Stereo

De Ro-98-01Page 98-Stereo aids, cross-over and two -channelspeaker control

Duotone-93-01Page 93-Complete line ofneedles and cartridges forLP and 78's

Eico-71 -01Page 71-Hi-fi amplifiers,preamps and speakers, wiredand kit

Electro-Voice-44-01 and 45-01Pages 44 and 45-Cartridges,speakers and enclosures forstereo installation and con-version

Erie -95-02Page 95-Audio-amplifier kit,designed for convertingphonos to stereo

Fairchild -98-02Page 98-Line of stereo com-ponents including cartridges,arms, turntables and ampli-fiers

Fanon-72-01Page 72-Low-cost conver-sion kits, including all re-quired components

Garrard -63-01Page 63-Hi-fi record changerusing stereo cartridges

General Electric -70-01Page 70-New "Golden Clas-sic" Stereo -Magnetic Cart-ridge

Grommes-62-01Page 62-New line of highfidelity stereo amplifiers &turners

Harman-Kardon-100-01Page 100-New line featur-ing "Trio" stereo amplifier."Duet" stereo tuner

Heath -69-01Page 69-Hi-fi amplifier kit;catalog describes over 100other kits

Jensen -74-01Page 74-New stereo Direc-tor Speaker Systems in fur-niture and kit forms

been issued an inquiry number. Check as many numbers on the coupon

below as you wish. Fill in the coupon completely, cut it out of the maga-

zine and mail it to ELECTRONIC TECHNICIAN, STEREO 1959, 480 Lexington

Avenue, New York 17, N.Y.

Oxford -95-01Page 95-New three-wayspeaker systems and bassreflex cabinets

Philco-65-01Page 65-New completeof diamond, sapphireosmium needles; newcording tape

lineandre -

Pickering -97-01Page 97-Stanton Stereo-Fluxvalve, precision stereopickup; Unipoise arm.

Pilot Radio -53-01Page 53-New complete lineof stereo tuners, preamps,control units and amplifiers

Ouam-91 -01Page 91-Line of hi-fi speak-ers, extended range, tweet-ers, woofers, coaxials

Rek-O-Kut-42-01Page 42-New Rondine turn-tables meet rigid tolerancesof stereo, assembled and inkit form

David Riemer-96-03Page 96-Quality micro-phones, cartridges, tonearms, earphones and hard-ware

Ro nette-91 -02Page 91-New stereo cart-ridges for both monauraland stereo high fidelity

CUT HER

Sherwood -92-01Page 92-FM and FM -AMtuners with high sensitivitycharacteristics

Shure -99-01Page 99-Dynetic cartridgesand tone arms for bothstereo and monaural

Sonoramic-96-01Page 96-Wide-latitude re-cording tape, packed in per-manent plastic case

Taco -93-02Page 93-FM antennas avail-able in kit form and withgold anodized finish

University -61-01Page 61-Hi-fi speakers andspeaker systems stereo -matched within 1 db

Utah -51-01Page 51-High quality loud-speakers, precisely manufac-tured to close tolerances

V -M-59-01Page 59-New "Stereo-O-Matic" 4 -speed recordchanger with stereo/mon-aural switch

Winegard-96-02Page 96-Gold anodized FMantennas in high gain andnon -directional models

This coupon must be used before Dec. 31, 1958

1. Circle free literature numbers:

42-01 44-0159-01 61-0171-01 72-0193-03 94-0198-01 98-02

45-0162-0174-0195-0199-01

46-0163-0191-0195-02

100-01

51-0165-0191-0296-01

53-01 57-01 58-0168-01 69-01 70-0192-01 93-01 93-0296-02 96-03 97-01

2. Fill in your name and address.Mail promptly to ELECTRONIC TECHNICIAN, StereoAve., New York 17, N. Y.

1959, 480 Lexington

Name

Address

City Zone State

Check one:I am a: . . Service Dealer ....Consumer Other

For all your hi-fi listening . . . Jensen presents these new StereoDirector* Systems with challenging performance ... in highfashion furniture...at prices that set new standards forloudspeaker values.

JENSEN DS -100 DUAL 3 -WAY SYSTEM WITH THE NEW,

JensenSTEREO DIRECTOR*

The DS -I00 dual stereo unit, in the popular lowboy, is theanswer to the buyer's demand for a complete stereo repro-

, ducer in one cabinet. This handsomely styled loudspeakersystem provides two completely independent 3 -way speaker sys-tems with 12" Flexair woofers (total of 6 speakers) which can be

used together for superior spread source monophonic sound, as wellas stereo. The two Stereo Directors, each having an 8 inch mid -channel and compression driver h -f unit, allow flexibility in cabinetplacement with maximum effectiveness in aiming the sound to thefavored listening area. Crossover frequencies 600 and 4000 cycles.32"'H., 52" W., 18I/4" D. Available in Walnut, Tawny Ash andMahogany Net Price 369.50

HOW THE NEW JENSEN STEREO DIRECTOR WORKS ...

A pair of these Director assemblies are used in the 05-100 Dual3 -way System (illustrated above), a single assembly in the 5S-100,mounted inside on the shelf above the Flexair woofer enclosure.Chassis easily rotated without moving cabinet, has an 8" m -f unit,compression -driver tweeter, network and control. All frequenciesabove 600 cycles are reproduced by the Stereo Director assembly. Complete system is also available in kit form.

Jensen STEREO DIRECTOR letsyou place the speakers wher-ever decor dictates, square tothe wall for best appearance.You send the sound to you, in-stantly adjust for best stereo lis-tening without moving cabinet.

ABOUT JENSEN'S NEW FLEXAIR WOOFERThe new Jensen Flexair Woofers are designed to extend bass response down to very low frequencies.They have highly -damped superlow resonance at the very bottom of the audio range -16 to 20 cycles.They have an exceptional degree of linearity and are capable of a total movement of 1". In even a rela-tively small Bass-Superflex enclosure, they deliver their extreme low -frequency performance with a newlow in distortion.

JENSEN SS -100 3 -WAY SYSTEM Jensen' WITH THE NEW STEREO DIRECTOR

Equivalent in performance to one section of the DS -100 -

Dual Stereo system, this elegant model includes StereoDirector Chassis and 12" Flexair woofer in the JensenBass-Superflex enclosure for smooth coverage of therange :from 20 to 15,000 cycles. Adequately driven tonormal room levels with a -10 watt amplifier. Two SS -100's

H., 21" W., ItH'i" D. Available in Walnut, Tawny Ash E3are ideal for stereo in the difficult -to -arrange living room,assuring perfect sound in the favored listening area. 32"

and Mahogany. Net Price 179.95

... BUILDING YOUR OWN STEREO SYSTEM?Use these new kits for superb sound ... finest stereo performance.

DC -3 STEREO DIRECTOR CHASSISMounts m -f and h -f units of KT -33 to makeStereo Director assembly as used in SS -100reproducers. Includes panel, base, assemblyhardware, and complete instructions.

Send forBulletin JH-1

KT -33 BASIC 3 -WAY SYSTEM KITIncludes Flexair 12 -inch woofer,special 8 inch m -f unit, and RP -103compression h -f unit. Complete with control,crossover network, wiring cable, and fullinstructions. Impedance 16 ohms;power rating 30 watts.

JensenTrademark, Patents pending, Division of The Muter Company

Space .peckers, suit deco,.., always perfect stereo.

Perfect stereoWhrele et you listen. evenwith adjacent wall layout.

MANUFACTURING COMPANY6601 S. Laramie Ave., Chicago 38, Illinois

In Canada: J. R. Longstoffe Co., Ltd., TorontoIn Mexico: Radios Y Television, S.A., Mexico D.F.


STEREO CATALOGSpecifications based on manufacturers' reports

For more information on these productsSEE INQUIRY COUPON ON PAGE 73& Directory of Manufacturers on Page 88

AMPLIFIERS & PREAMPSACROSOUNDUltra -Linear IISingle channel, 60 -watt am-plifier has 18 to 30,000 cpsresponse ±1 db at full 60watts. Hum is 90 db belowrated output. IM distortionless than 0.5% at 50 watts.Harmonic distortion less than1%. Damping variable 0.5 to15. Undistorted square wave.$109.50 wired; $79.50 kit.

ARKAY SA -25Dual preamp drives 25 -wattWilliamson amplifier in chan-nel 1. Output of channel 2is fed to existing monauralamplifier. IM distortion 1.8%at 20 watts. Harmonic dis-tortion 1.5%. Hum -90 db.Damping factor 16. Kit $59.95.Also, not shown, SP -6 dualpreamp/amp kit $39.95.

BELL 3030Dual preamp/amplifier, 15watts/channel, has 20 to20,000 cps response ±0.5 db.Harmonic distortion is 0.5%at 1 db below 15 watts. Hum-79 db. Dual outputs, 4, 8,16 ohms and hi -Z. $169 95.Also, not shown, Model 2221dual channel 10 -watt pre-amp/amplifier Ci $129.95.

BOGEN DB212Dual preamp/amplifier, 12watts/channel, has speakerphasing switch. Response is20 to 20,000 cps ±1 db. Noiseand hum -80 db. Harmonicdistortion 0.5% at rated out-put. Chassis $115.00; enclo-sure and legs $7.50. Also, notshown, AC -10 single channelamplifier $55.00.

EICO HF-81Dual preamp/amplifier, 14watts per channel, has 10 cpsto 100 kc response ±0.5 dbat 2 watts. IM distortion 0.5%at 5 watts/channel. Harmonicdistortion less than 1%. Humand noise -75 db. Speakerimpedances 4, 8 and 16 ohms.$109.95 wired, with cover;$69.95 kit.

EICO HF-85Dual preamp and controlcenter has independent levelcontrols with built-in clutch,hum balance control. 30 dbfeedback. Response 5 to200,000 cps ±0.3 db, to 3 vrms out. Hum 75 db. IM dis-tortion 0.03% at 1 v. Har-monic distortion 0.1% at 3 v.$64.95 wired; $39.95 kit.

FAIRCHILD 248Dual preamp consists ofstacked Model 245. Harmonicdistortion is less than 1% at1 v. Noise -85 db. Voltagegain is 60 db in phono andtape inputs. Record changerposition provides RIAA curveand rumble filter. Ganged vol-ume control. $239.50. Model245 monaural, $119.50.

FISHER X-101Dual preamp/amplifier, 20watts/channel, has 0.7% har-monic distortion at ratedoutput. IM distortion 2%.Hum and noise -80 db.Crosstalk 50 db betweenchannels. Sensitivity 2 myfor phono input. 6 pairs ofstereo inputs. 4, 8 and 16ohm outputs. $189.50.

ELECTRONIC TECHNiCIAN Stereo, 1959 75

FISHER PR -66

Dual preamp, self -powered,has no controls, is designedfor remote control. 2 inputsand 2 outputs for connectionto audio control. AC humbalance pot. Response 20 to20,000 cps ±2 db. Gain 40 db.Hum & noise -68 db. Distor-tion 0.2% for 2 v out. Cross-talk -60 db. $29.95.

GROMMES 40PG

Dual preamp. amplifier, 20watts/channel, has 20 to20,000 cps response ±0.5 db.Harmonic distortion 1%, IMdistortion 2% at rated output.Hum & noise -80 db. Push-button rumble & scratch fil-ters. $159.50. Also, not shown,Model 24PG, 12 watts/chan-nel, $99.50.

GROMMES 209

Dual preamp with dc fila-ments has 10 to 20,000 cpsresponse ±0.25 db. Harmonicdistortion 0.05%, IM distor-tion 0.1% at rated output.Hum & noise -80 db. Out-put 1 v, up to 20 v withoutoverload. $159.50. Also, notshown, Model 214 dual pre -amp priced at $99.50.

HARMAN-KARDONA-250Dual preamp/amplifier, 25watts/channel, has 20 to20,000 cps response ±1 db at20 watts. Harmonic distor-tion less than 0.5% at 20watts, IM distortion 2%. Sep-aration over 50 db. Has fil-ters, dc filaments. $179.50.Enclosure $12.50. Also, notshown, AX20 stereo, $99.95.

HARMAN-KARDONA-224Dual preamp/amplifier, 12watts/channel, has 45 to20,000 cps response ±1 db at12 watts. Harmonic distortionless than 1%, IM 2%. Hum-80 db. Channel separationover 50 db. Separate gangedcontrols, mode switch, bal-ance control, rumble filter.$99.95. Enclosure $7.

HEATH SP -2

Dual preamp has built-inpower supply and scratchfilter. Features 2 -channelmixing and remote balancecontrol with 20 ft. of cable.Includes 6 inputs with 4 levelcontrols. Sensitivity 2.5 my.2 on -off switches, one for acreceptacles. $56.95 in kit form.

LEAK 20

Dual amplifier, 12 watts,channel, has 20 to 20,000 cpsresponse ±0.5 db. Harmonicdistortion 0.1% at 10 watts.Hum & noise -80 db. 26 dbfeedback. Input sensitivity125 my for 10 watts. $139Also, not shown, Model 50stereo, $179; Point One pre -amp, $109.50.

MADISON FIELDING 320

Dual preamp/amplifier, 20watts/channel, has 20 to 20,-

.000 cps response ±0.5 db.Hum & noise -75 db. Poweris calibrated on knobs inpeak watts. Magic eye aidspre-program level settings.4, 8 and 16 ohm speaker out-puts. $169.95. Enclosure is$19.95. Also, Model 340

McINTOSH C-85

Preamp is designed for add-ing stereo to existing mon-aural system. Stereo balancecontrol permits both chan-nels to be balanced with onecontrol. Includes mode se-lector, rumble filter and rec-ord compensator. $99. Blondeor mahogany enclosure $10extra.

PILOT SM-244

Dual preamp/amplifier, 14watts/channel, has 20 to20,000 cps response ±1 db.Hum & noise -80 db. Har-monic distortion 1%, IM1.5%. Balance control, dc fil-aments. $189.50. Also, notshown, SP -215 stereo pre -amp with two VU metersfor setting reference levels,$189.50.

PILOT SP -210

Dual preamp may be pow-ered from separate stereoamplifier (SA -232, $89.50;SA -260, $129.50, not shown)or separate power supply(P-10, $19.50). Response 20to 20,000 cps ±1 db. Hum &noise -80 db. Harmonic dis-tortion 0.2% at max. sensi-tivity. $89.50.

REGENCY HF-50

Single channel 50 watt am-plifier has 20 to 20,000 cpsresponse ±0.2 db. Harmonicdistortion 1%, IM distortion1%. Output 8 and 16 ohms.1.5 v input for rated output.Negative feedback circuits.Available wired at $89.50; kit$74.50.

76 ELECTRONIC TECHNICIAN ^ Stereo, 1959

SARGENT-RAYMENTSR -17-17

Dual preamp/amplifier 17watts/channel, has 20 to15,000 cps response ±1 db.Harmonic distortion 0.32% at17 watts, IM 1.5%. Hum &noise -70 db. Ganged con-trols. Balance control. $189.60.Also, not shown, SR -534 dualchannel 17 watt stereo am-plifier, $106.60.

H. H. SCOTT 299

Dual preamp/amplifier, 17watts/channel, has rumbleand scratch filters. Harmonicdistortion 0.8% at full power,IM 0.3%. Noise & hum -80db. DC on filaments. Phasereversing switch. $199.95.Also, not shown, 209 dualpreamp/arnplifier, 15 watts/channel, $139.95.

Arms

FAIRCHILD 282

Arm wired for 4 -pin car-tridges is designed for rec-ords up to 12"; usable to 16".Operates down to 2 gramsstylus force, adjustable bythumbscrew. Self-containedarm locking detent. No armrest required. Separateground wire. Black anodizedaluminum. $42.50.

GARRARD TPA/12

Arm with plug-in head re-places TPA/10 tone arm.Two leads wired for stereoto take any cartridges. Usablefor up to 16" records. Fixedlength and tracking anelepreset. Independent weightadjustment screw atop arm.Single hole mounting. Price$19.50.

GENERAL ELECTRICTM -2G

Arm, statically balanced, fea-tures 2 -step adjustment forprecise setting of trackingforce between 0 and 6 grams.Play up to 12" records. De-signed for VR-II cartridge.Built-in arm rest. Height ad-justable from % to VA". 1ground & 4 lead terminals.$29.95.

SHERWOOD S-4000

20 -watt amplifier with pre -amp has dual controls, re-verse and phase inversionswitches, for converting mon-aural system to stereo. Re-sponse is 20 to 20,000 cps ±1.5db at rated output. Hum &noise -80 db. Also, notshown, S-5000 dual 20 -wattpreamp/amp.

STROMBERG-CARLSONASR -433

Dual preamp/amplifier has1% distortion at usual lis-tening levels. Controls in-clude channel selector, mas-ter volume control, and in-dividual channel controls.$119.95. Also, not shown, aresingle channel amplifiers AR -430, 431 and 432 $59.95,$99.95 and $119.95.

GRADO

Arm of gunstock walnutwood features one-piece con-struction. One knob adjust-ment for tracking force, ±7grams. Tracking error 0.8°.Resonance 10 cps. Offsetangle 24.5%. Wired for stereocartridges. For 12" records,$29.95; 16" transcription arm$32.50.

PICKERING 196

Arm includes same designcartridge as Fluxvalve Model371. Single pivot bearing.Will mount on motorboardmeasuring only 151/2" x 151/2".Uni-mount installation em-ploys single thumbscrew andbolt. Arm rest with sablebrush keeps stylus dust free.$59.85.

REK-O-KUT S-120

Arm of tubular aluminum,die-cast zamak cartridgeshell and brass counter-weight, has 2 ball bearingraces. Plug-in shell takes 3and 4 pin cartridges. Reso-nance 12 to 15 cps. 12" stereounit $27.95. Also S-160 16",$30.95. PS -20 4 -pin lead &extra shell $5.95.

H. H. SCOTT 1000

Arm with magnetic stereocartridge (made in conjunc-tion with London Recording)is 12.5" long. Optimum track-ing force is 3.5 grams. Stylustin 0.5 mil, output 4 my.Height adjustable 1%" to21/2". Crosstalk better than-20 db. With arm rest, hard-ware. $89.95.


CARTRIDGES

ASTATIC 13TBX

Stereo ceramic plug-in turn-over cartridge has 20 to15,000 cps response. 4 ter-minals. Tracking is 5 to 7grams. Separation -25 db.Compliance 2. Output 0.5v/channel. Load 2 meg. Withholder and 0.7 mil diamond& 3 mil sapphire 20.50.Model 13TB, 2 sapphires,$7.95.

AUDIOGERSH 200

Stereo variable reluctancecartridge has 30 to 18,500 cpsresponse ±2 db. 3 terminals.Tracking force 4 to 6 grams.Crosstalk less than -20 db.Compliance 4. Output 25 myat 1 kc for 10 cm/sec. Recom-mended load 37 k. Com-pletely shielded. With 0.7mil diamond $59.50.

COLUMBIA SC -1

Stereo ceramic cartridge has30 to 16,000 cps response ±2.5db. 3 terminals. Tracking 5to 7 grams. Separation 20db. Compliance 2. Output0.4 v at 1 kc for 5 cm/sec.Load 1.2 meg. With flexiblecable, hardware and 0.8 mildiamond needle $36.25.

DUOTONE GPS80-1

Stereo ceramic cartridge has20 to 17,500 cps response ±2db. 3 terminals. Recom-mended tracking force is 6grams. Output 1 v. Com-pliance 2. Channel separation20 db. Floating needle actionnullifies pinch. With 0.7 mildiamond $31.25; sapphire $20.

ELECTRO-VOICE 66DS

Stereo ceramic plug-in car-tridge has 20 to 15,000 cpsresponse. 3 terminals. Track-ing 5 to 8 grams. Compliance1.8. Output 1 v. With 0.7 mildiamond and 3 mil sapphire$19.50. Both sapphires $5.95.Mount $1. Also, not shown,21D, $32.50, PZT magnetic$16.50-$37.50.

ERIE

Stereo ceramic plug-in cart-ridge has 0.4 v output. 3terminals. Turnover design.Single ceramic element. itec-mil/mended tracking force5 to 6 grams. Separation 20db over most of frequencyrange. Compliance 1.7. Withdiamond and sapphire nee-dles $24.50; 2 sapphires $5.95.

FAIRCHILD 232

Stereo dual rotating coilcartridge will track 30cm/sec at 1 kc with 4 gramsof stylus force. 4 terminals.Output 3 my/channel. Im-pedance 600 ohms. Fits both1/2" and 7/16" mounting cen-ters. With extra twisted pairleads and diamond needle$49.50.

GENERAL ELECTRICGC -7

Stereo magnetic variable re-luctance cartridge has 20 to17,000 cps response. Output6 my/channel. Lateral com-pliance 3; vertical 2. Track-ing 3.5 to 7 grams. With 0.7mil diamond needle $23.95.Model CL -7 with sapphire$16.95. Model GC -5 with 0.5mil diamond $26.95.

GRADO

Stereo dynamic cartridge has5 my/channel output k -t 10cm/sec. 4 terminals. 10 to35,000 cps. Tracking force 2grams. Channel separation is25 db. Compliance 8. IM dis-tortion approximately 2%.Impedance 600 ohms. Inputload over 5 k. Stylus mass1 mg. $49.50.

PICKERING 371D

Stereo magnetic cartridgehas flat stereo range response± 2 db. 4 terminals. inter -channel interference -20 db.Includes hum rejection cir-cuit. Recommended load re-sistance 27 k to 47 k. T -guardstylus for quick replacement.With 0.7 mil diamond stylus$29.85.

RONETTE BF -40

Stereo cartridge has 20 tola,vuu cps response. Optimumtracking force 4 to 6 grams.Lateral and vertical com-pliances 3.5. Dual -elementBinofluid unit with clip -indiamond needle, Model BF -40D is priced at $18.60. ModelBF -40S with sapphire needleis $12.


SHURE M3D

Stereo "dynetic" cartridgehas 20 to 15,000 cps response±3 db. 4 terminals. Channelseparation -20 db. Output 5my. Recommended load 50 k.Compliance 4. Recommendedtracking force 3 to 4 grams.DC resistance 440 ohms. With0.7 mil diamond needle $45.

SONOTONE 8T

Stereo turnover ceramic car-tridge has 20 to 12,000 cpsresponse. 4 terminals. Track-ing force 5 to 7 grams. Out-put 0.3 v. Compliance 2. Iso-lation -20 db. Recommendedload 1 to 5 meg. With 0.7 mildiamond and 3 mil sapphire$24.50; both diamond $34.50;both sapphire $14.50.

TANNOY

Stereo variable reluctancecartridge has 30 to 16,000 cpsresponse ±2 db. Output is6 to 8 my/channel. Trackingforce is 3 to 4 grams. Notrecommended for recordchangers or record playerswith heavy tracking force.With 0.7 mil diamond needle$37.

WEATHERS

Stereo ceramic cartridge has15 to 30,000 cps response.Output 0.25 v at 7 cm/sec.Recommended tracking force2 grams. Separation betweenchannels 25 db. Completelyshielded. Complete with pick-up leads, connectors. Withdiamond needle $17.50; sap-phire needle $9.75.

CHANGERS

AUDIOGERSH XS -200

Four -speed automatic andmanual changer with push-buttons has rubber mattedturntable. Intermixes 10" and12" records in any sequence.Single play and automaticspindles. $67.50. With GEcartridge, diamond needle,$86.25. Also, not shown, XM-110A manual, $37.50.

COLLARO TSC-840

Four -speed automatic & man-ual changer has 2 -piece armwith 5 -terminal plug-in head.7", 10" and 12" automaticintermix. Wow and fluttter0.25%. Counterbalanced arm.$49.50. Also, not shown, TSC-740 4 -speed, $42.50; TSC-640,4 -speed, one-piece arm, $38.50.

GARRARD RC88

Four -speed automatic andmanual changer comes withinterchangeable spindles.Plug-in head. Muting switch.With GE cartridge, diamond& sapphire, $73.80; changeralone, $54.50. Also, not shown.RC98 alone, variable speed.$67.50; RC121 automatic alone.$42.50.

GLASER-STEERS GS77

Four -speed automatic andmanual changer has stereo -monaural switch, mutingswitch, receptacle for auto-matic amplifier shut - off.Turntable pauses duringchange cycle. Intermixes33 1/3 and 45 records. Auto-matic speed selector. $59.50.45 rpm spindle $3.60.

VM 12014 -speed changer includesstereo cartridge. Stereo -mon-aural switch and jacks. Jam -proof spindle. Rumble -48db. Tracking angle variation2°. 4 -pole motor. $50. As re-placement changer on metalbase pan, Model 1226, $56.Model 1202, with plug-inhead, no cartridge, $50.

For more information on these products

SEE INQUIRY COUPON ON PAGE 73& Directory of Manufacturers on Page 88


CONTROL UNITS & ADAPTERS

BOGEN STA-1

Stereo adapter permits singleknob control of both channelvolumes. Monaural - stereo.switch. Reverse and normalswitch. Left -right balanceadjustment for 2 speakers.Connects to 2 amplifiers.$13.50. Also, not shown, ST10-A adapter -amplifier, $52.50.

DYNAKIT DSC-1

Stereo control unit addscontrol facilities to pair ofpreamps. Passive network.3 controls include volume,balance and blend to fill"hole in middle" by feedinginput through both ampli-fiers. Reverse, loudness &tape switches. Kit $12.95.

CONVERSIONKITS

FANON STK-10

Conversion kit adapts anyphono to stereo. Includes 2 -way speaker system with 3"and 8" speakers, 5 -tube am-plifier. With stereo cartridge,wood cabinet jacks, leads,$59.95. Also STK-5 $49.95;STK-4 with 3 -tube amplifier,two 4" speakers, $39.95.

GARRARD SCK-1

Kit converts company's rec-ord players for stereo. Con-sists of female connectorwired with 2 leads for tonearm, audio cable for secondamplifier, cartridge shell andhardware. No soldering. ForRC 88, 98, 121 and Tmk II.$4.95. Also SCK-2 for RC121/II.

NORTRONICS SK -100Kit converts monaural taperecorders to 1/2 -track, 2 -channel stereo when properamplifiers are added. Play-back and record functions.Includes head and wired as-sembly. Crosstalk -50 db.4 my out @ 1 kc. $23.50.Also, not shown, SK -50 1/4 -track, 4 -channel $26.

DYNAMIC SA -70

Stereo adapter permits cou-pling cartridges, tape headsor tuner to 2 amplifiers. 2inputs with stereo -monauralslide selector switch. Withtwo 31" shielded leads andmolded -on pin plugs $7.50.

MARANTZ 6

Stereo adapter provides step-attenuator master volumecontrol. Selector switchchooses phono, tuner, tape,TV, extra, stereo or monau-ral. Speaker reversal switch.12 inputs, 2 recording out-puts. With 2 output cablesto preamps. $45.

H. H. SCOTT 135

Stereo-Daptor permits simul-taneous control of 2 separateamplifiers. Master volumecontrol for both channels.Function selector. Passivecircuit. Loudness control.Input 300 k, output 100 k.Reverse stereo. Record -play-back switch. $24.95.


SEE INQUIRY COUPON ON PAGE 73

& Directory of Manufacturers on Page 88

REK-O-KUT SC -12

Stereo arm conversion kitincludes all parts and twosimple tools to convert com-pany's A-120 and A-160 armsto stereo. Includes plug-inhead, terminal board andbasic arm element. For 12"arm, $17.95. Model SC -16 for16" arm, $19.95.

WALCO

Complete conversion kit forhome phono includes stereocartridge, 0.7 mil diamondneedle, 4 -watt, 5 -tube ampli-fier and preamp for secondchannel, speaker in enclo-sure and related hardware.Amplifier has separate trebleand bass controls. $69.50.


MICROPHONESSONOTONEModel CM -10 omnidirectionalhigh -impedance ceramic typehas 50 to 13,000 cps response.±3 db. Sensitivity -57 db.Perforated aluminum griddamping. With 7' of shieldedcable terminating in stand-ard phone plug, $19.50.

AMERICAND204 dynamic type, 70 to9500 cps, -57 db output, withpushbutton, for tape record-

ELECTRO-VOICEModel 951 cardioid crystaltype, 50 to 11,000 cps, -55db, hi -Z, $49.50. 664 cardioid

SHURE

Model 535 omnidirectionaldynamic, 60 to 13,500 cps,-59 db, $72.50. Model 55S

TURNER

Model L-100 crystal type, 50to 10,000 cps, -52 db level,with 20' shielded cable, $12.50.

ing and general purpose, $7to $24.30. D9A low impedance

dynamic, 40 to 15,000 cps,-55 db, $85. 926 omnidirec-

unidirectional dynamic, 50 to15,000 cps, -60 db, $83. Model

Model 139 multi -impedancedynamic, 60 to 10,000 cps, -52

dynamic cardioid, 100 to 7000cps, -57 db, $82.50. D22 dy-namic omni-directional, 50 to

tional crystal, 60 to 8,000 cps,-60 db, for pa and recorders,$29.50. 666 cardioid dynamic,

777 general purpose crystal,60 to 10,000 cps, -62 db, $25.Model 737A super-cardioid

db, $45. Model 98 cardioiddynamic, 65 to 11,000 cps,-52 db, $59.50; on -off switch

12,000 cps, -55 db, variable 40 to 15,000 cps, -55 db, $150. crystal, -54 db, $46. add $4.Z, $99.50.

SPEAKERS & ENCLOSURES

ACOUSTIC RESEARCHAR -2Speaker system with acousticsuspension has two 5" conetweeters, and 10" woofer with1.1 lb. Alnico magnet, reson-ant frequency 58 cps. 40 to15,000 cps. 20 to 40 watts.131/2" x 11" x 24". 8 ohms.2000 cps crossover. $96. Also,not shown, AR -1 0 $185.

ARGOS TSE-1Enclosure with forward frontdesign and ducted ports has2165 cu. in. volume. Size 24" x11" x 101/2". This bookshelfarrangement can accommo-date an 8" woofer plustweeter. Covered with ribbedpyroxylin fabric. $16.50. Also,not shown, DSE-2 @ $44.50.

ATLAS WT -6Outdoor coax -projectorspeaker comprises weather-proof cone type driver with6" throat coupled to individ-ual woofer horn. Separatepressure -type driver andtweeter horn. 15 watts. 140 to15,000 cps response. 8 ohms.15" bell opening, 12" depth.$34.50.

AUDIOSPEAKER 12Enclosure with wrap -aroundcloth is 4' high, takes up 1sq. ft. of floor space. Anechoicdesign. Standard model for12" speakers $79; also for 8",$59; 15", $89. Utility models,painted plywood, $39, $49 and$59. Also, not shown, Custom16 woofer, 18 cps res., $89.

CLETRON C-1233Woofer -tweeter combinationwith crossover networkmounted on sounding boardcomprises 12" woofer with21 -oz. Alnico magnet and two3" tweeters. Board 16" x 20" x7". 30 to 18,500 cps. Reson-ance 35 cps. 35 watts. $60.Also, not shown, C-16PCcoax, 15", $59; C-8JC $18.

DYNAMIC 5-4Speaker system with one 8"woofer, two 5" midranges andone 4" tweeter and crossovermeasures 18" x 14" x 10". Inwalnut, mahogany or blonde.$39.50. Model S-2 with wooferand one midrange $29.50.Also, not shown, Model S-12,12" coax and 4" tweeter,$49.50.


EICO HFS-2

Speaker system completelywired and assembled is om-nidirectional. 36" x 151/4" x111/2". 45 to 20,000 cps flat. Hascoax with free floating coneand slot loaded split conicalhorn. 30 watts. 16 ohms.$139.95. Also, not shown,HFS-1 two way system$39.95.

ELECTRO-VOICE 1 A

Coronet model speaker sys-tem measures 25" x 91/2" x17%". It includes the com-pany's SP8B coax, T35V vhfdriver, X36 crossover andAT37 level control. $102. En-closure alone $35.50. Also,not shown, are speaker sys-tems Patrician IVD $1086;Centurion IV $392; Aristocrat$72.

ELECTRO-VOICE

Second channel "Stereon"speaker system eliminatesneed for full range by pro-ducing main stereo fre-quencies above 300 cps.Lower frequencies phased tomain speaker by XX3 filter.3 -way, $129.50 and $99.50.Also, not shown, enclosurekits KD1 through KD7, $118to $26.

GENERAL ELECTRICA1-401

12" golden coax speaker has40 to 15,000 cps response. 25watts. 8 ohms. 14.5 oz. Alnicowoofer magnet, 6.8 oz. fortweeter. 1500 cps crossover.Slotted plate baffles tweeter.$49.75. Also, not shown,Model 850 8" extended range,50 to 12,000 cps, 8 ohms,$10.95.

GENERAL ELECTRICAl -4066 cu. ft. distributed port en-closure is designed for 12"speakers. May be used instraight wall or corner loca-tions. 25%" x 181/4" x 311/4".Heavily lined absorbent in-terior. $64.95. Also, notshown, A1-411 enclosure, 26"x 11" x 10", 1.2 cu. ft. $35.95.

HEATH SE-1/SC-1

Speaker enclosures SC -1, leftand right models, flankequipment cabinet SE -1Available in birch and ma-hogany. Wing speaker en-closures are open backed tohold closed systems; 16" x291/4" x 141/2" inside. Cabinet471/2" x 361/2" x 20". SE -1$149.95; SC -1 $39.95 ea.

JENSEN KT -44

4 -way speaker component kit15" woofer, 8" upper if unit,midrange and supertweeter.40 watts. 16 cps to beyondaudibility. 16 ohms. $192.50.On DC -4 ($15.95) chassis asshown, when mounted inE-200 enclosure, ($295.50)SS -200 Stereo Director (notshown) , $439.50.

JENSEN DS -100

Dual 3 -way speaker systemhas two 3 -way Stereo Direc-tors, each with 12" woofer,8" mf, compression hf unit.Directors may be rotated tobeam sound. 32" x 52" x 181/4"20 to 15,000 cps. 30 watts/channel. $369.50. Also, notshown, SS -100 single 3 -waysystem $179.95.

KINGDOM KAL

2 -way speaker system has35 to 17,000 cps range. 14watts. 11" x 233/4" x 10".leatherette covered, $49.50. 15"brass legs $5.95. Also, notshown, Audette Senior 2 -waysystem, 35 to 17,000 cps, 221/4x 221/2 x 101/2, $69.50. Com-pass -1, 20 to 20,000 cps,$149.50.

KLIPSCH H

3 -way speaker system is de-signed to derive a thirdstereo channel from 2 soundtracks. 11" x 12" x 16". With12" woofer $198; with 8"woofer $188. Also, not shown,Model T Shorthorn, 30 to22,000 cps, $382; Deluxe Klip-schorn $785; economy model$460.

JAMES B. LANSINGD44000

Dual 3 -way system has twosets of JB 150-4C 15" woofers,375 hf drivers, 075 ring radia-tors, and dividing networks.333/4" x 241/2" x 106". $1830 and$1884. Also, not shown,D42216 system, 111/2" x 24" x12", $84.30; D130 extendedrange 15" speaker, $84.

OXFORD 3W203 -way speaker componentsinclude 12" woofer, 8" mid-range, 31/2" tweeter and hard-ware. To 15,000 cps. $39.OXN-31 crossover networkshown, $12.30. Also, notshown, bass reflex cabinet,33%" x 23%" x 17", $111;C15L608 15" coax, 30 to 15,000cps, 25 watts, $43.50.


RCA SHS1 1Speaker system has 8"woofer -midrange and two3%" tweeters. 29%" x 20" x16". Ebony, mahogany, oakand walnut finishes. With 25'connecting cable, $49.95 ea.Also, not shown, SHS10 cor-ner system, $49.95; SHS12bookshelf, $19.95; SHS8, $125.

RJ Super 8Speaker system with 8" fullrange speaker for bookshelfinstallation, $50.50 unfirilahad,$59.50 finished. 11" x 231/4" x10". Enclosure alone, $18.50and $37.50. Also. notModel 12-S enclosure, 24" x21" x 10", $49.50; Model 1.) en-closure, 20" x 20" x 16", $56.

SONOTONE WR-8Wide range 8" speaker has55 to 13,000 cps response. 8watts. 8 ohms. Flux density12,000 gauss. $12. Also, notshown, speaker in Capriceenclosure, 20" x 11" x 10",3/4" plywood hand finished,$53.50; CA -12A coax speaker,35 to 20,000 cps, 10 watts, 8 to16 ohms, $27.50.

STENTORIAN HF1 01 6U10" universal speaker with30 to 15,000 cps response has35 cps cone resonance. 16,000gauss, 31,4 lb. Alcomax mag-net. Option of 4, 8 or 16 ohms.$36.50. Also, not shown, 31/4"cone tweeter T-359, 3000 to17,000 cps, 15 watts, 16 ohms,9000 gauss, $14.95.

STEPHENS BWD2 -way speaker system in-cludes Model 120W 12"woofer ($60) with 30 -watt,30 cps resonance ratings, andModel 5 -KT toroid tweeter($49.50) with high pass filterand brilliance control. Also,enclosures from 815 book-shelf @ $48 to Eames E-3with 3 -way @ $595.

STPOMBERG-CARLSONRF483Coax speaker, 15" woofer andtweeter, has 25 to 18,000 cpsresponse. 45 cps free airresonance. 16 ohms. $99.95.Also, not shown, RF-480 8"speaker, 18 watts, 30 to 17,000cps, $24.95; RS -461 labyrinthsystem, 2 -way, second chan-nel, 40 to 18,000 cps, $69.95.

TANNOY 15Dual concentric 15" speakeris rated at 25 watts. 15 ohms.Resonance 40 cps. Crossover1000 cps. Complete cone as-sembly may be removed forgap cleaning. Less than 2%IM products. 18,000 gauss inhf gap. Depth 9". $159.

UNIVERSITY C-15HCHigh compliance 15" wooferdown to free air resonance,15 cps, 800 cps cutoff. 20 watts.4-8 and 10-20 ohms. Also, notshown, UXC-123 3 -way dif -faxial, 45 to 17,500 cps, $64;HF 206 tweeter, $33; T-50high frequency horn driver,$49.50; C-12HC woofer, $49.50.

UNIVERSITY S-102 -way speaker system with12" woofer and tweeter haslow 15-20 cps resonance.1500 cps crossover. Full bassresponse down to 30 cps. 25"x 14" x 14W. $139. Also, notshown, S-il 3 -way with 15"woofer, $245; EN-15LH mul-tiple speaker enclosure,$139.50.

UTAH C8SExpanded range 8" speaker,20 to 15,000 cps. 16 ohms.solderless terminals. $47.50.Also, not shown, are C8R 8"low frequency unit @ $54.95;C12S expanded range, $52;C12R 20 to 7500 cps, $59.95;C15R $67.50; CT5JN 5"tweeter, 3500 to 20,000 cps,$19.50.

VITAVOX DU -120Coax speaker with 12"woofer and 3" tweeter has30 to 15,000 cps response israted at 30 watts. 15 ohms.Resonance 40 to 45 cps. Cross-over 2000 cps. Tweeter haspolyester film diaphragm.External dividing networkother than capacitor not re-quired. $89.50.

WELLCOR CBC-8-12Bass reflex enclosure withinclined port allows floor toact as cabinet extension.Over 3 cu. ft. Cut out for 8"and 12' speakers. 221/4" x191/4" x 13%'. On swivel base'.$24.45. Also, not shown, CS -12corner enclosure, 24" x 28" x21", precut 12 and 15", $72.

WHARFEDALE SFB/3Custom model 3 -way speakersystem with 12" woofer, 10"midrange and 3" tweeter hassand -filled baffle. 30-35 cpsresonance. 20 to 20,000 cps.15 ohms. 34" x 31" x 12". $199.Also, not shown, Deluxemodel $249; W/AF/1 2 -waysystem, 30" 2t 17" x 12', $144.50.


TAPE RECORDERS

AMPLIFIER CORP. 611-D"Stereo-Magnemite" tape re-corder has battery -operatedmotor. 50 to 7500 cps. 50 dbrange. 17 lbs. 0.1% flutter.7% ips. 5 v out. Earphonestereo playback. In weather -tight case $445. 611-C, ips,100 to 3000 cps, $405; 611-E,50 to 15,000 cps, $475.

BELL T-203/RP-120Tape transport (T-203) withmonaural and stereo inlineand offset erase/record-play-back heads is $139.95. Withtwo RP -120 record -playbackpreamps, $59.95 each, re-sponse is 20 to 10,000 cps ±2db. Sensitivity 0.001 v onmike. 5 v out. 50 db S/N. 1%distortion.

BERLANT-CONCERTONE33-22 -channel stereo tape re-corder includes separateerase on each channel. 71and 15 ips. 55 db S/N. 40 to15,000 cps at 15 ips. 0.1%flutter and wow. $995. Also,not shown, Model 63 dualrecord and playback stereo,$695; with case $755.

BOGEN TR-30Tape recorder designed forhalf-track monaural record-ing and stacked stereo play-back. Built-in dual preamps.7% and 15 ips. 50 db S/N at3% distortion. 40 to 15,000 cpsat 15 ips; 50 to 10,000 cps at7% ips. 3 motors. Takes 101/2"reel. About $400.

4.10V-411 04CIP 4 IP

sax=

CROWNImperial model tape recorderwith monaural record andstereo inline playback pro-vision takes up to 101" reels.Two tracks. 30 to 15,000 cps±2 db at 71 ips. 0.15% flut-ter. 52 db S/N. $535. Alsoavailable, not shown, Stereo -X for stereo record.

PENTRONStereo tape playback andmonaural recorder plays 4 -track RCA tape cartridgewhich snaps into position,eliminating conventionalreels. 33/4 and 7% ips. 40 to15,000 cps. Separate preampfor each channel. VU meter.Auto shutoff. Index counter.$269.50.

PENTRON NL-4Dual channel unit recordsand plays back 2- & 4 -trackstereo. 40 to 15,000 cps at 7%ips; 40 to 10,000 cps at 33/4 ips.50 db S/N. Flutter 0.3%. 8speakers. $349.95. ES -2 speak-ers $59.95. RC -6 remote con-trol $9.95. Not shown, NL-1Sstereo $139.95.

ROBERTS 90-SDual channel unit plays backstereo and records stereofrom broadcasts and stereorecordings. Hysteresis -syn-chronous drive motor. 40 to15,000 cps ±2 db at 7% ips;40 to 7500 cps ±2 db at 33/4ips. Dual remote speaker out-puts. $325.

SUPERSCOPE DK-555ADual channel unit recordsand plays back stereo. 30 to16,000 cps at 7% ips. 30 to10,000 cps at 33/4 ips. Flutterand wow 0.2%. 2% harmonicdistortion. 4 watts output.Stacked heads. -50 db cross-talk. With 2 Sony mikes$525. Portable case $70.

V -M 750Tape recorder plays backstereo and records monaural45 db S/N ration. 5 watts out-put. 0.4% flutter and wow.7% and 33/4 ips. Storage com-partment for 16 reels plusaccessories. $275. Also, notshown, Model 714, playsstacked and staggered tapes,$225.

84 ELECTRONIC T:CHNICIAN Stereo, 1959

TUNERS

ARKAY ST -11

Tuner provides simultaneousFM/AM reception. FM sensi-tivity 4µv for 20 db quieting.Hum -65 db. 20 to 20,000 cps±0.5 db. Distortion 1%. Se-lectivity 200 kc 6 db down.$49.95 kit, $74.50 wired. Also,not shown, FM -8 tuner,$39.95 kit, $59.95 wired.

BOGEN RB115

FM/AM tuner with singlechannel preamp and 15 wattamplifier has 20 to 20,000 cpsresponse ±1 db. Distortion2%. FM sensitivity 3.5 my for30 db quieting. Selectivity180 kc, 3 db. $149.50. Enclo-sure $7.50. Also, not shown,TC-100 FM/AM tuner $87.50.

BOGEN T661

FM/AM tuner has FM sen-sitivity of 2.5 xv for 30 dbquieting, 300 ohm antenna.Selectivity 180 kc, 3 db down.20 to 18,000 cps ±0.5 db. Dis-tortion 1.5%. Hum -60 db.$129.50. Enclosure $6. Also,not shown, RB-140 FM/AMtuner -amplifier $249.50.

CHAPMAN S -5E

FM/AM/SW tuner has 2 i-fstages. Sensitivity 4 .v onFM for 20 db quieting. Selec-tivity 200 kc, 3 db down. EM -81 tuning eye. Tuning rangesare 1.1-3.3 mc, 3-8.5 mc, 8.1-23 mc, 88-108 mc, and 545-1600 kc. High and lowimpedance autputs. $149.95.

DYNAMIC AF-250PA

FM/AM tuner with built insingle channel preamp and12 watt amplifier has 11tubes. 20 to 20,000 cps res-ponse. Loudness, bass, trebleand function controls. $129.50.AF -250 without preamp,$119.50. Also, not shown,T2000 FM/AM tuner alone,afc, $99.50.

EICO HFT 90

FM tuner with travelingneon indicator has 20 to20,000 cps response ±1 db.Sensitivity 2.5 Av for 30 dbquieting. I -F bandwidth 260kc, 6 db down. Hum -60 db.Maximum drift 20 kc fromcold start. Kit with frontend wired $39.95; wired$65.95. Enclosure $3.95.

FISHER 101-R

FM/AM tuner has 20 to20,000 cps response ±1 db.FM sensitivity 2.2 ov for 30db quieting. I -F bandwidth180 Ice 3 db down. 60 dbsignal/iium. Crosstalk -80db. Separate FM and AMindicator. $229.50. Also, notshown, Model 90-T FM/AMwith preamp $239.50.

GROMMES 120GAT

FM/AM tuner with singlechannel preamp and 20 wattamplifier has 20 to 20 cpsresponse ±1 db. 1% har-monic distortion, 2% IM. FMsensitivity 2 mv for 20 dbquieting. Selectivity 250 kc,6 db down. Amplifier humand noise -80 db. Filters.$169.50.

GROMMES

FM tuner with electroniceye, afc, two i-f stages andtwo limiters has 20 to 20,000cps response ±0.5 db. Sen-sitivity 1µv for 20 db quiet-ing. 2% IM and 1% harmonicdistortion. Hum & noise -60db. $79.50. Also, not shown,102GT, FM/AM, $119.50.

-2-1°11174'1'

HARMAN-KARDONT-224

"Duet" FM/AM tuner withseparate channels for each,30 to 15,000 cps ±0.75 db.Sensitivity 3.5 ov for 20 dbquieting. Selectivity 240 kc,6 db down. Drift 5 kc max.IM 0.5%. Hum -60 db.1114,95. Also, not shown,rx2o single channel FM/AM,$99.95.

HARMAN-KARDONTP200FM/AM tuner with dual pre -amps has 12 operating con-trols. Separate FM and AMsections. Indexer identifiesFM/AM station pairs. 15 to30,000 cps ±0.5 db. 0.3% IMand harmonic. Hum -80 db.Crosstalk -50 db. $189.95.Also, not shown, T-250 tuner1139.95.


HEATH PT -1FM/AM tuner has 16 tubes,afc and AM variable band-width control, 15 kc on nar-row, 35 kc on broad, 6 dbdown. 300 kc i-f band forFM. 600 kc FM discrimina-tor. I -F strip consists of twoprinted circuit boards. Kitform, front end prewired,$89.95.

MADISON FIELDING 330FM/AM tuner with twochannels has tuning indica-tor for simultaneous tuningof FM and AM. 20 to 20,000cps ±1 db. I -F bandwidth420 kc, 6 db down. AFC. AMsensitivity 15 pv per meterloop. $149.95. Enclosure$149.95 in mahogany, walnut,blonde.

McINTOSH MR -55FM/AM tuner has afc, 20 to20,000 cps response ±3 db.FM sensitivity 3µv at 100%modulation. 4 i-f stages. 2limiters. Hum -75 db. Drift30 kc without afc. Captureratio 1 to 0.8. AM distortion1%. Whistle filter. $249. En-closure $25.

PILOT FA -680FM/AM tuner for simultan-eous reception has separateAM and FM tuning meters.3 i-f stages, 2 limiters. Sen-sitivity 1µv with 30% modu-lation for 20 db quieting.1 kc wideband detector eli-minates afc. $199.50. Also, notshown, FA -690 FM/AMtuner, $179.50.

TURNTABL0

COLLARO 4TR2004 -speed turntable has 4 -polemotor isolated by 3 tensionsprings parallel to unit plate.Bearing with steel ball takestotal thrust. Shuts off eachtime before changing speed.Black rubber mat. $49.50.Also, not shown, manualplayer TP59, 4 speeds, $29.50.

PILOT FA -690FM/AM tuner with dualpreamp has 2 tuning meters,and other specifications sim-ilar to Model FA -680. Pre -amp ratings for each channelare 20 to 20,000 cps ±1 db,output 1 v, hum and noise-80 db below 1 v, 0.2%harmonic distortion. $269.50.

SARGENT-RAYMENTSR -380FM/AM tuner with dualpreamp 20 to 20,000 cps re-sponse ±1 db. Sensitivity onFM 3µv for 20 db quieting.Harmonic distortion 0.17%for 1 v out. Hum -75 db.Rumble and scratch filters.Cathode follower outputs.Carbon deposited resistorsin preamp. $189.60.

H. H. SCOTT 330-CFM/AM tuner has sensitivityof 2µv for 20 db quieting.Includes tuning meter andvernier tuning controls. AGC.Separate channels. 2 limiterstages. $209.95. Also, notshown, are Model 300FM/AM tuner with singlechannel preamp $167.95; 310-B FM $178.45.

SHERWOOD 5-2000FM/AM tuner has 20 to20,000 cps response ±0.5 db.Sensitivity on FM 1.8 1.1, for30 db quieting. IM 0.25% at100% modulation, 400 cps.Hum -60 db. AFC. 2 v out.$139.50; with case $144.50-$154.50. Also, not shown,S-2000 FM tuner $99.50 with-out case.

STROMBERG-CARLSONSR -440FM/AM tuner has 20 to20,000 cps response. FM sen-sitivity 1.8 pv for 20 dbquieting. I -F bandwidth200 kc. 11 tubes. AM band-widths 15 kc in broad posi-tion, 7 kc in sharp. Lowimpedance cathode followeroutput. $159.95 without topcover.

totollielteme0=021OXItuaZ1306111

COMPONENTSFour -speed turntable has33 1/3 pulley; others inter-changeable. Noise -60 db.Wow and flutter 0.25%. Speedaccuracy 0.5%. 4 -pole induc-tion motor. Professional Jr.,$39.50. Extra pulleys $2.50.Base $10. Also, not shown,Models PBT & PBT4, $99.50& $109.


CONNOISSEURThree -speed turntable withcontinuously variable speeds,±2% around each speedrange. Wow less than 0.15%of rated speed. Rumble bet-ter than -50 db at 7 cm/secand 500 cps. 12" non-mag-netic table. Synchronous hys-teresis motor. With Mark IItone arm $110.

FAIRCHILD 412-4Four -speed turntable haselectronic control regulatorconsisting of variable fre-quency oscillator/amplifier,which drives motor; speeddetermined by control fre-quency, adjustable ±5%.$229.50. Two speed withoutelectronic regulator, $129.50;one speed, $99.50.

GARRARD 4HFFour -speed turntable is var-iable around each speed. 12"table. Automatic start -stop inarm rest. Lift arm to start;replace to stop. $59.50. WithGE cartridges, $68.45 to$83.45. Also, not shown, 301turntable only (& $89; ModelT complete $56.45.

PICKERING 800Single -speed 33 1/3 rpm floatson air cushion. Vertical pe-riod of spring suspensionbelow 5 cps. Noise -65 db.Speed accuracy ±0.2%. Built-in precision leveling indi-cator. Foam rubber mat.Plays 7" to 12" records. $59.85.Bases available at $7.50 and$12.

PRESTO T -18AThree -speed turntable has11 7/8" table. Speed selectorhas 5 positions, two offs in-cluded. Wow and flutter0.2%. Rumble -47 db. With4 -pole induction motor $75.T-18-AH with hysteresismotor $131. Also, not shown,T-2 @ $59.50.

REK-O-KUT B -12HThree -speed turntable re-quires no external 45 adapter.Neon light on -off indicator.Noise -57 db. Strobe discaffixed. With hysteresis syn-chronous motor $129.95. Sim-ilar Rondine B-12GH $99.95.Also, not shown, B-12 @$84.95;

-37 @ $59N -33H @.95 $69.95; L-34and L.

REK-O-KUT K33Single -speed 331/3 rpm turn-table with 4 -pole inductionmotor has built-in strobe forchecking speed. Table ta-pered for easy disc handling,made of lathe turned alumi-num. Noise -47 db. Comesin kit form, requiring about30 minutes for assembly.$39.95.

H. H. SCOTT 710-AThree -speed turntable haseach speed range adjust-able by ±5%. Expanded scaleonticAl strobe. Rumble -60db. Wow and flutter 0.1%.Machined aluminum castingtable. Slip clutch for cueing.Induction motor. Helicaldrive gears in oil transmis-sion. $139.95.

STROMBERG-CARLSONPR -499Continuously variable turn-table from 14 to 80 rpm has4 -pole motor. Stroboscopicwindow pilot light. Noiselevel -55 db. Wow 0.18%rms. Flutter 0.1% peak, 0.01%rms. Elastic drive belt. Deckprovided with legs for oper-ation without base. $99.95.

THORENS TD -134Four -speed turntable withtranscription arm has ad-justment provision for speed.With line cord and shieldedcable $59.95. Wood base $9.Also, not shown, TD -184 withdialing arrangement to setarm on disc's lead-in groove,priced at $74.95.

WEATHERSSingle -speed 331/3 rpm turn-table kit comes up to syn-chronous speed in 3/4 of arevolution. Conical springshock mounting isolate turn-table from table vibrations.Turntable pad touches outerrim of discs, not grooves.Small 12 -pole synchronousmotor. $34.50.


SEE INQUIRY CARD ON PAGE 73

& Directory of Manufacturers on Page 88


STEREO BUYERS DIRECTORYManufacturers grouped in 12 product categories

1 -AMPLIFIERS, PREAMPLIFIERS,& CONTROLS

Amplifiers, 1 -channel 1

Amplifiers, 2 -channel 2Control Units, stereo 3Preamplifiers, 1 -channel 4Preamplifiers, 2 -channel 5

Acro Products Co., 369 Shurs Lane, Philadel-phia 28, Pa. -1-2-4-5

Alliea Radio Corp., 100 N. Western Ave.,Chicago 80, 111:1-2-3-5

Altec Lansing Corp., 1515 S. Manchester Ave.,Anaheim, Calif. -1-2-3-4-5

Ampex Audio, Inc., 1020 Kifer Rd., Sunnyvale,Calif. -I-5

A.R.F. Products, Inc., 7627 Lake St., RiverForest, 111.-1

Arkay Radio Kits, 120 Cedar St., New York6 N.Y.-1-2-3-5

Barker Sales Co., 339 S. Broad Ave., Ridge-field, N.J.-1-4

Bell Sound Systems, 555 Marion Rd., Colum-bus 7, Ohio -1-2-4

Blonder -Tongue Labs., 9 Ailing St., Newark2, N.J.-1-4

Bogen Co., David. P.O. Box 500, Paramus,N.J.-1-2-3-4-5

Brand Products Inc. (Madison Fielding), 11 Lor-imer Si., Brooklyn 6, N.Y.-2-5

British Industries Corp. (Leak) 80 Shore Rd.,Port Washington, N.Y.-1-2-4-5

Copehart Cu. 216 W. 14 St., New York 11,N.Y.-1-2

Components Corp., 106 Main St., Denville,N.J.-5

Cook Laboratories. Inc., 101 2 St., Stamford,Conn. -1-2-4-5

DeRo Electronics 134 Nassau Rd., Roosevelt,L.I. N.Y.-3

DeWald Radio, Div. United Scientific Labs.,35-15 37 Ave., Long Island City 1, N.Y.-1-2

Dynaco Inc., 617 N. 41St., Philadelphia 4,Po. -3

Dynamic Electronics -New York Inc., 73-39Woodhaven Blvd., Forest Hills, L.I., N.Y.-1-2-3-4

Electron Enterprises, 6917 W. Stanley Ave.,Berwyn 111:1-2

Electronic Applications, 194 Richmond HillAve , Stamford Conn. -2

Electronic Development Associates, 126 E. 46St New York 17, N.Y.-1-2-4-5

Electronic Instrument Co. (Eico), 3300 North-ern Blvd., Long Island City 1, N.Y.-1-2-4-5

Electro-Voice, Inc., Buchanan Mich. -3Ercono Corp., 16 W. 46 St., New York 36,

N Y.-1-2-3Erie Resistor Corp., 644 W 12 St., Erie 6, Pa. -1Fairchild Recording Equipment Corp. 10-40

N.Y:45 Ave., Long Island City 1, 122-4-5Fannon Electric Co., 98 Berriman St., Brook-

lyn 8. N.Y.-1-2-3Fen -Tone Corp., 106 5 Ave., New York 11,

N.Y.-1-2-4-5General Electric, Specialty Electronic Compo-

nents Dept., W. Genesee St., Auburn, N.Y.-1-4

Greene Co., L. Charlton, 314 Washington St.,Newton 58, Mass. -1

Harmon-Kardon Inc., 520 Main St., Westbury,N.Y.-1-2-3-4-5

Heath Co., Benton Harbor, Mich.1-3-4-5Lafayette Radio, 165-08 Liberty Ave., Jamaica

33, N.Y.-I-2-3-4-5McIntosh Lab. Inc., 2 Chambers St.. Bing-

hampton, N.Y.-I-3-4-5Marantz Co., 25-14 Broadway, Long Island

City 6, N.Y.-1-3Musical! Corp., 4512 W. Jefferson, Los Angeles

16, Calif. -1-2-4-5Newcomb Audio Products Co., 6824 Lexing-

ton Ave. Hollywood 38, Calif. -2Nortronics Co., 1015 S. 6 St., Minneapolis 4,

Minn -1-2-3-4-5Pentror Corp., 777 S. Tripp Ave., Chicago 24,

111.-4-5Permoflux Products Co., 4101 San Fernando

Rd., Glendale 4, Calif. -1-2-4-5Pilot Radio Corp., 37-06 36 St., Long Island

City N.Y.-1-2-3-4-5Powers Co., J.J., 1317 S. 5 Ave., Maywood,

III -1-2Precise Development Corp., 2 Neil Court,

Oceanside. N.Y.-I-2-4

Precision Electronics Inc., (Grammes) 9101King St., Franklin Park, 111:1-2-3-4-5

Radio Music Corp., 84 S. Water St., PortChester, N.Y.-1-2-4-5

Regency Div., Idea Inc., 7900 Pendelton Pike,Indianapolis 26, Ind. -1-4

Roberts Electronics, 1028 N. LaBrea Hollywood38, Colit.-5

Sargent-Rayment Co., 4926 E. 12 St., Oakland1, Calif. -2-5

Scott Inc., H.H., 111 Powder Mill Rd., May-nard Mass. -1-3-4-5

Setchell-Carlson, Inc., New Brighton, St. Paul12, Minn. -2

Sherwood Electronics Labs., 4300 N. Calif.Ave., Chicago 18, 111.-1

Simpson Mfg. Co., Mark, 32-28 49 St., LongIsland City 3 N.Y.-1

Stromberg-Carlson, Special Products Div., 1400N. Goodman St., Rochester 3, N.Y.-1-2-4-5

Tannoy (America) Ltd., P.O. Box 177, E. Nor-wich, L.I., N.Y.-1-4

Tech Master Corp.. 75 Front St., Brooklyn 1,N.Y.-1-2-3-4-5

Telectro Industries Corp., 35-16 37 St., LongIsland City 1, N.Y.-1-2-3-4-5

Universal Woodcrafters Inc.. La Porte, Ind.1 -2-4-5

Video Instruments Co., 3002 Penna. Ave.,Santo Monica, Calif. -1-2-4-5

Weathers Industries, 66 E. Gloucester Pike,Barrington, N.J.-2

Webcoi, Inc., 5610 W. Bloomingdale Ave.,Chicago 39, 111.-3

Webster Electric Co., 1900 Clark St., Racine,Wis.-1-2-4-5

Wells -Gardner & Co., 2701 N. Kildare Ave.,Chicago 39, 111:1-2-3-4-5

S. Chauncey St.,Columbia City, Ind. -1 -3

2-CARTRIDGES, STEREO PHONOAmerican Microphone Mfg. Co., 412 S. Wy-

man St., Rockford, Ill.Astatic Corp., Harbor & Jackson Sts., Con-

neaut, OhioAudiogersh Corp., 514 Broadway, New York

12, N.Y.Barker Sales Co.. 339 S. Broad Ave., Ridge-

field N.J.Berger Communications, 109-01 72 Rd., For-

est Hills N.Y.CBS-Hytron, 100 Endicott St., Danvers, Mass.Duotone Co., Locust St., Keyport, N.J.Eleclro-Sonic Labs. 35-54 36 St., Long Island

City 6, N.YElectro-Voice Inc., Buchanan, Mich.Ercona Corp. 16 W. 46 St., New York 36,

N.Y.Erie Resistor Corp., 644 W 12 St., Erie 6, Pa.Fairchild Recording Equipment Corp., 10-40

45 Ave., Long Island City 1, N.Y.Federa' Electronics Sales, Federal Electronics

Bldg., Rockville Centre, L.I.. N.Y.Fen -Tone Corp. 106 5 Ave., New York 11,

N.Y.General Electric Specialty Electronics Compo-

nents Dept., W. Genesee St., Auburn, N.Y.Heath Co., Benton Harbor, Mich.Jensen Industries 7333 W. Harrison St., For -

e31. Park, Ill.Lafayette Radio, 165-08 Liberty Ave.. Ja-

maica 33, N.Y.Miller Mfg. Co., M A., 4 & Church St., Lib-

ertyville III.Pickering & Co.. Sunnyside Blvd., Plainview,

L.1., N.Y.Radio Music Corp.. 84 S. Water St., Port

Chester, N.Y.Recoton Corp., 62-35 Barnett Ave., Long

Island City 4, N.Y.Ronette Sales Corp. 190 Earle Ave., Lynbrook,

N.YScott Inc., H. H., 1 1 I Powder Mill Rd., May-

nard, Mass.Shure Bros., 222 Hartrey Ave., Evanston, Ill.Sonotone Corp., Elmsford, N.Y.Tannoy, (Americo) Ltd.. P.O. Box 177, E. Nor-

wich L.I., N.Y.Televex Co. 46 Lakeview Ave., Yonkers, N.Y.United Audio Products. 202 E. 19 St.. New

York 3, N.Y.Weathers Industries, 66 E. Gloucester Pike.

Barrington, N.J.Webster Electric Co., 1900 Clark St., Racine,

Wis.

3-CHANGERS, TURNTABLES &ARMS

Arms 1

Changers 2Turntables 3

American Microphone Mfg. Co., 412 S. Wy-man St. Rockford, 111:1

Astatic Corp., Harbor & Jackson Sts., Con-neaut, Ohio -1

Audiogersh Corp., 514 Broadway, New York12, N.Y.-2-3

Bogen Co., David. P.O. Box 500, Paramus,N.J.-3

British Industries Corp. (Garrard), 80 Shore Rd.,Port Washington, N.Y.-1-2-3


Electronics Applications, 194 Richmond HillAve., Stamford, Conn. -3

Electro-Sonic Lobs., 35-54 36 St., Long IslandCity o, N.Y.-1

Ercona Corp.. 16 W. 46 St., New York 36,N.Y.-1-2-3

Fairchild Recording Equipment Corp., 10-4045 Ave., Long Island City 1, N.Y.-1-3

Fen -Tone Corp., 106 5 Ave., New York 11,N.Y.-2

General Electric, Specialty Electronic Compo-nents Dept., W. Genesee St., Auburn, N.Y.-1

Glaser -Seers Corp., 20 Main St., Belleville 9N.J .-2

Heath Co., Benton Harbor, Mich. -3Lafayette Radio, 165-08 Liberty Ave., Ja-

maica 33, N.1.-1-2-3Metzner Eng'g Corp., 1041 N. Sycamore Ave..

Hollywood 38, Calif. -3Pickering & Co., Sunnyside Blvd., Plainview,

L.I., N.Y.-1-3Radio Eng'g Co., Inquirer Bldg., Philadelphia

30, Pa. -2Radio Music Corp., 84 S. Water St.. Port

Chester N.Y.-1-3Rek-O-Kut Co., 38-19 108 St., Corona 68,

N.Y.-1-3Rierne Co., David, (Rystl), 601 W. 26 St.

New York 1, N.Y.-1Rockbar Corp., (Collaro), 650 Halstead Ave.,

Mamaroneck, N.Y.-2Ronetti Sales Corp., 190 Earle Ave., Lyn-

brook, N.Y.-1Scott Inc., H. H. 1 1 1 Powder Mill Rd., May-

nard, Mass. -1-3Shure Bros., 222 Hartrey Ave., Evanston, 111.-1Smolin Labs. Woodbrook Dr., Springdale, Conn.

-2Stromberg-Carlson, Special Products Div., 1400

N. Goodman St., Rochester 3, N.Y.-1-2-3Thorens Co., Thorens Ave., New Hyde Park

N.Y.-2-3United Audio Products, 202 E. 19 St., New

York 3, N.Y.-2V -M Corp., Benton Harbor, Mich. -2Weathers Industries, 66 E. Gloucester Pike

Barrington, N.J.-3Webcor, Inc., 5610 W. Bloomingdale Ave..

Chicago 39, 111:2

4-CONVERSION KITSStereo Phono 1

Stereo Tape Recorder 2

Allied Radio Corp., 100 N. Western Ave., Chi-cago 80, ill. -1

Altec Lansing Corp., 1515 S. Manchester Ave.,Anaheim, Calif. -1

American Electronics, Inc., 9449 W. JeffersonBlvd., Culver City, Colif.-2

Ampex Audio Inc., 1020 Kifer Rd., Sunnyvale,Calif:1-2


Audiogersh Corp., 514 Broadway, New York 12,N.Y.-1

Blonder -Tongue Labs, 9 Ailing St., Newark2, N.Y.-1-2

Boger Co David, P.O. Box 500, Paramus,N.J.-1

British Industries Corp., 80 Shore Rd., PortWashington, N.Y.-I


Capehart Corp., 216 W. 14 St., New York 11,N.Y.-1

Components Corp., 106 Main St., Denvile,N.J .-1

Dynamic Electronics -New York Inc., 73-39Woodhaven Blvd., Forest Hills, L.I., N.Y.-1

Electron Enterprises, 6917 W. Stanley Ave.,Berwyn, 111.-1

Electronic Applications, 194 Richmond HillAve. Stamford, Conn. -2

Electronic Development Associates, 126 E. 46St., New York 17, N.Y.-1

Electrovox Co. (Walco), 60 Franklin St., E.Orange, N.J.-1

Ercona Corp., 16 W 46 St., New York 36,N.Y 2

Fanon Electric Co., 98 Berriman St., Brooklyn8, N.Y.-]

Fen -Tone Corp., 106 5 Ave., New York 11,N Y.-2

Miller Mfg. Co., M. A., 4 & Church St., Liberty-ville, 111.-1

Nortronics Co., 1015 S. 6 St., Minneapolis 4,Minn. -2

Olympic Radio & Television, 34-01 28 Ave.,Long Island City 1, N.Y.-1

Pentron Corp., 777 S. Tripp Ave., Chicago 24,111.-2

Pickering & Co., Sunnyside Blvd., Plainview,L.I., N.Y.-]

Pilot Radio Corp., 37-06 36 St., Long IslandCity 1, N.Y.-1

Powers Co., J. J., 1317 S. 5 Ave., Maywood,111.-1

Rek-O-Kut Co., 38-19 108 St., Corona 68,N.Y -1

Revere Camera Co., 320 E. 21 St., Chicago 16,111.-2

Roberts Electronics, 1028 N. La Brea, Holly-wood 38, Calif. -2

Scott Inc., H. H., 111 Powder Mill Rd., May-nard, Mass. -1

Smolin Labs., Woodbrook Dr., Springdale, Conn.-2

Stromberg-Carlson, Special Products Div., 1400N. Goodman St., Rochester 3, N.Y.-1

Tech Master Corp., 75 Front St., Brooklyn I,N.Y.-1

Telectro Industries Corp., 35-16 37 St., LongIsland City 1 N.Y.-1-2

Viking of Minneapolis, 9600 Aldrich Ave. S.,Minneapolis 20, Minn. -2

V -M Corp., Benton Harbor, Mich. -1-2Weathers Industries, 66 E. Gloucester Pike,

Barrington, N.J.-1Webcor, Inc., 5610 W. Bloomingdale Ave., Chi-

cago 39, 111.-1Webster Electric Co., 1900 Clark St., Racine,

Wis.-1-2Wells -Gardner & Co., 2701 N. Kildare Ave.,

Chicago 39, 111.-1Whitley Electronics, Inc., 411 S. Chauncey St.,

Columbia City, Ind. -1-2

5 -MICROPHONES &ACCESSORIES

Allied Radio Corp., 100 N. Western Ave., Chi-cago 80, Ill.

Altec Lansing Corp., 1515 S. Manchester Ave.,Anaheim, Calif.

American Geloso Electronics, Inc., 312 7 Ave.,New York 1, N.Y.

American Microphone Mfg. Co., 412 S. WymanSt., Rockford, Ill.

Asiatic Corp., Harbor & Jackson Sts., Con-neaut, Ohio

Duotone Co., Locust St., Keyport, N. J.Electronic Applications, 194 Richmond Hill

Ave., Stamford, Conn.Electra -Voice Inc., Buchanan, Mich.Ercona Corp., 16 W. 46 St., New York 36, N.Y.Fen -Tone Corp.. 106 5 Ave., New York 11,

N Y.

Lafayette Radio, 165-08 Liberty Ave., Jamaica33, N.Y.

Luxo Lamp Corp., 102 Columbus Ave., Tucka-hoe, N.Y.

North American Philips Co., 230 Duffy Ave.,Hicksville, N.Y.

Riemer Co., David, (Rystl), 601 W. 26 St., NewYork I N.Y.

Shure Bros., 222 Hartrey Ave., Evanston, III.Sonotone Corp., Elmsford, N.Y.Stephens Trusonic Inc., 8538 Warner Dr., Cul-

ver City, Calif.Tannoy (America) Ltd., P.O. Box 177, E. Nor-

wich, L.I., N.Y.Turner Co., 909 17 St., N.E., Cedar Rapids,

IowaWebster Electric Co., 1900 Clark St., Racine,

Wis.

6 -NEEDLES, 0.5 OR 0.7 MILAmerican Phono Needle Co., 1 Continental

Ave., Forest Hills 75, N.Y.Astatic Corp., Harbor & Jackson Sts., Con-

neaut, OhioBerge, Communications, 109-01 72 Rd., Forest

Hills, N.YDuotone Co. Locust St., Keyport, N.J.

Electrovox Co. (Walco), 60 Franklin St., E.Orange, N.J.

Fen -Tone Corp., 106 5 Ave., New York 11,N.Y.

Fidelitone inc., 6415 Ravenswood Ave., Chi-cago 26, III.

General Electric, Specialty Electronic Compo-nents Dept., W. Genesee St., Auburn, N.Y.

Jensen Industries, 7333 W. Harrison St., ForestPark, Ill.

Miller Mfg. Co., M. A., 4 & Church St., Liberty-ville, Ill.

Pfanstiehl Chemical Corp., 104 Lake ViewAve., Waukegan, Ill.

Pickering & Co., Sunnyside Blvd., Plainview,L.I., N.Y.

Recoton Corp., 62-35 Barnett Ave., LongIsland City 4 N.Y.

Shure Bros., 222 Hartrey Ave., Evanston, III.Televex Co., 46 Lakeview Ave., Yonkers, N.Y.Webster Electric Co., 1900 Clark St., Racine,

Wis.

7 -PHONOGRAPH SYSTEMSAccessories 1

Stereo, complete 2

Admiral Corp., 3800 W. Cortland St., Chicago47, 111.-2

Allied Radio Corp., 100 N. Western Ave.,Chicago 80, 111.-2

Ampex Audio Inc., 1020 Kifer Rd., Sunnyvale,Calif. -2


Audio -Master Corp., 17 E. 45 St., New York17, N.Y.-2

Berger Communications, 109-01 72 Rd., ForestHills, N.Y.-2

British Industries Corp., 80 Shore Rd., PortWashington, N.Y.-]

Capehart Corp., 216 W. 14 St., New York 11,N.Y.-2


DeRo Electronics, 134 Nassau Rd., Roosevelt,L.I. N.Y.-1

Duotone Co., Locust St., Keyport, N.J.-1Dynamic Electronics -New York Inc., 73-39

Woodhaven Blvd., Forest Hills, L.I., N.Y.-1-2Electron Enterprises, 6917 W. Stanley Ave.,

Berwyn, 111.-2Electrovox Co. (Walco), 60 Franklin St., E.

Orange, N.J.-1Emerson Radio & Phono. Corp., 14 & Coles

Sts., Jersey City 2, N.J.-2Fairchild Recording Equipment Corp., 10-40

45 Ave., Long Island City 1, N.Y.-2Fanon Electric Co., 98 Berriman St., Brooklyn

8, N.Y.-2Fen -Tone Corp., 106 5 Ave., New York 11,

N.Y.-1Fidelitone Inc., 6415 Ravenswood Ave., Chi-

cago 26, 111.-1General Electric, Specialty Electronic Compo-

nents Dept., W. Genesee St., Auburn, N.Y.-1Granco Products, Inc., 36-07 20 Ave., Long

Island City 5, N.Y.-2Greene Co., L. Charlton, 314 Washington St.,

Newton 58, Mass. -1Hallmark Electronics Corp., 383 Concord Ave.,

New York 54, N.Y.-2Heath Co. Benton Harbor, Mich. -2Leslie Creations, Lafayette Hill, Pa. -1Magnavox Co., 2131 Bueter Rd., Ft. Wayne,

Ind. -2Microtran Co., 145 E. Mineola Ave., Valley

Stream, N.Y.-1Miller Mfg. Co., M. A., 4 & Church St., Lib-

ertyville, 111.-1Motorola, Inc., 4545 W. Augusta Blvd., Chi-

cago 51, 111.-2Musicall Corp., 4512 W. Jefferson, Los An-

geles 16, Calif. -2Olympic Radio & Television, 34-01 28 Ave.,

Long Island City 1, N.Y.-2Philco Corp., "C' & Tioga Sts., Philadelphia

34, Pa. -2Pilot Radio Corp., 37-06 36 St., Long Island

City 1, N.Y.-2Precise Development Corp., 2 Neil Court,

Oceanside, N.Y.-2Radio Corp. of America, Cherry Hill, Delaware

Township, Camden 8, N.J.-2Recoton Corp., 62-35 Barnett Ave., Long

Island City 4, N.Y.-1Riemer Co., David (Rystl), 601 W. 26 St., New

York 1, N.Y.-1Robins Industries Corp., 36-27 Prince St.,

Flushing 54, N.Y.-1Setchell-Carlson, Inc., New Brighton, St. Paul

12, Minn. -2Stevens Products, Inc., 86 Main St., East

Orange, N.J.-1Stromberg-Carlson, Special Products Div., 1400

N. Goodman St., Rochester 3, N.Y.-2Telectro Industries Corp., 35-16 37 St., Long

Island City 1, N.Y.-2United Audio Products, 202 E. 19 St., New

York 3, N.Y.-1Vidaire Electronics Mfg. Co., 44 Church St.,

Baldwin, L. I., N.Y.-1V -M Corp., Benton Harbor, Mich. -1-2Wolsco Electronics Mfg. Co., 100 W. Green

St., Rockford, 111.-1

Waters Conley Co., 17 E. Chestnut St., Chicago11, 111.-2

Webcor, Inc., 5610 W. Bloomingdale Ave.,Chicago 39, 111.-1-2

Wells -Gardner & Co., 2701 N. Kildare Ave.,Chicago 39, 111.-2

Wendell Plastic Fabrics Corp., 1220 Broadway,New York 1, N.Y.-1

Westinghouse Electric Corp., Metuchen, N.J.-2Whitley Electronics, Inc., 411 S. Chauncey St.,

Columbia City, Ind. -2Zenith Radic Corp., 6001 W. Dickens Ave.,

Chicago 39, 111.-2

8 -RECORDS, STEREOAudio Fidelity, Inc., 770 11 Ave., New York,

N.YColumbia Records, 799 7 Ave., New York 19,

N.Y.Components Corp., 106 Main St., Denville, N.J.Concertapes, Inc., P.O. Box 88, Wilmette, III.Cook Laboratories, Inc., 101 2 St., Stamford,

Conn.Counterpoint Recordings Inc., 333 6 Ave., New

York 14, N.Y.Decca Records, 50 W. 57 St., New York 19,

N.Y.Elektra Corp., 361 Bleecker St., New York 14,

N.Y.Fidelity Distributors, 7803 Sunset Blvd., Holly-

wood 46, Calif.Hallmark Electronics Corp., 383 Concord Ave.,

New York 54, N.Y.Int'l Pacific Recording, (Omega) 854 N. Vine

St., Hollywood 38, Calif.London Records, 539 W. 25 St., New York, N.Y.Mercury Records, 35 E. Wacker Dr., Chicago 1,

Radio Corp. of America, RCA Records Div.,155 E. 24 St., New York, N.Y.

Smolin Labs., Woodbrook Dr., Springdale, Conn.Stere-O-Craft, Div. Craft Recording Corp., 1650

Broadway, New York, N.Y.Stereo Sound Studios, 238 E. 26 St., New York

10, N.Y.Urania Records, 233 Main St., Belleville 9, N.J.Vanguard Recording Society, 256 W. 55 St.,

New York 19, N.Y.Vox Productions (Stereovox), 236 W. 55 St.,

New York 19, N.Y.Westminster Recordings Co., 275 7 Ave., New

York 1, N.Y.Zodiac Recording Co., 501 Madison Ave., New

York 22, N.Y.

9 -SPEAKERS & CABINETSEnclosures & Cabinets 1

Speakers & Speaker Systems 2

Acoustic Research, Inc., 24 Thorndike St.,Cambridge 41, Mass. -2

Allied Radio Corp. (Knight), 100 N. WesternAve., Chicago 80, 111.-1-2

Altec Lansing Corp., 1515 S. Manchester Ave.,Anaheim, Calif. -1-2

American Loudspeaker Div., ContemporaryAmerican Furniture, 1821 Berteau, Chicago13, 111.-1

Ampex Audio Inc., 1020 Kifer Rd., Sunnyvale,Calif. -2


Argos Products Co., 301 Main St., Genoa, 111.-IArnhold Ceramics Inc., Isophon Div., 1 E. 57

St., New York 22, N.Y.-2Atlas Sound Corp., 1449-39 St., Brooklyn 18,

N.Y -2Audiogersh Corp. (Kingdom), 514 Broadway,

New York 12, N.Y.-2Audiospeaker Laboratories, 1114 E. Emporia

St., Ontario, Calif. -1-2Barker Sales Co., 339 S. Broad Ave., Ridge-

field, N.J.-2Becker Electronic Mfg. Corp., 1091 Rockaway

Ave., Volley Stream, N.Y.-2Berger Communications, 109-01 72 Rd., Forest

Hills, N.Y.-1Blonder -Tongue Labs., 9 Ailing St., Newark 2,

N.J .-1-2Bozak Sales Co., R. T., Box 1166, Darien,

Conn. -1-2Bradford Audio Corp., 27 E. 38 St., New York

16, N.Y.-1-2British Industries Corp. (Wharfedale, R -J) 80

Shore Rd., Port Washington, N.Y.-I-2Cabinet Div., G & H Wood Products, 99 N. 11

St., Brooklyn 11, N.Y.-1Calif Cabinet Co., 522 S. San Pedro St., Los

Angeles 13, Calif. -1Capehart Corp., 216 W. 14 St., New York 11,

N.Y.-]Cletron, Inc., 1974 E. 61 St., Cleveland 3,

Ohio -2DeRo Electronics, 134 Nassau Rd., Roosevelt,

L.I N.Y.-1Duotone Co., Locust St., Keyport, N.J.-1Dynamic Electronics -New York Inc., 73-39

Woodhaven Blvd., Forest Hills, L.I. N.Y.-1Electron Enterprises, 6917 W. Stanley Ave.,

Berwyn, 111.-1


Electronic Applications, 194 Richmond HillAve., Stamford, Conn. -2

Electronic Instrument Co. (Eico), 3300 North-ern Blvd., Long Island City 1, N.Y.-1-2

Electro-Voice, Inc., Buchanan, Mich. -1-2Ercona Corp.. 16 W. 46 St., New York 36, N.Y.-

1-2Fourjay Industries, 2360 W. Dorothy Lone

Dayton 39, Ohio -1General Electric, Specialty Electronic Compo-

nents Dept., W. Genesee St., Auburn, N.Y.-I -2

Granco Products, Inc., 36-07 20 Ave., LongIsland City 5, N.Y.-2

Greene Co., L. Charlton, 314 Washington St.,Newton 58, Mass. -1

Hallmark Electronics Corp., 383 Concord Ave.,New York 54, N.Y.-2

Hartley Products Co., 521 E. 162 St., NewYork 51, N.Y.-2

Heath Co., Benton Harbor, Mich. -1Jensen Mfg. Co., 6601 S. Laramie Ave., Chi-

cago 38. 111.-1-2Klipsch & Associates, Hope, Ark, -2KLH Research & Devel. Corp., 30 Cross St.,

Cambridge, Mass. -2Lafayette Radio, 165-08 Liberty Ave., Jamaica

33, N.Y.-i-2Lansing Sound Co., James, 3249 Casitas Ave.,

Los Angeles 39, Calif. -1-2Lowell Mfg. Co., 3030 Laclede Station Rd.,

St. Louis 17, Mo.-2Mobil Electronics Mfg. Co., 1111 State Rd.

67 E., Anderson, Ind. -1Neshaminy Electronic Corp. (JansZen) Nesha-

miny, Pa. -2North American Philips Co., 230 Duffy Ave.,

Hicksville, N.Y.-1-2Olympic Radio & Television, 34-01 28 Ave.,

Long Island City 1, N.Y.-1Oxford Components Inc., 556 W. Monroe St.,

Chicago 6, 111.-1-2Pentron Corp., 777 S. Tripp Ave., Chicago 24,

111.-2Permoflux Products Co., 4101 San Fernando

Rd., Glendale 4, Calif. -1-2Pickering & Co., Sunnyside Blvd., Plainview,

L.I.' N.Y.-2Pilot Radio Corp., 37-06 36 St., Long Island

City 1.Y.-2Co.,CPowers J. J., 1317 S. 5 Ave., Maywood,

111.-2Quam-Nichols Co., 226 E. Marquette Rd., Chi-

cago 37, 111.-2Racon Electric Co., 1261 Broadway, New York

1, N.Y.-1-2Radio Merchandise Sales, 2016 Bronxdale Ave.,

New York 62, N.Y.-1Riemer Co., David, (Rystl), 601 W. 26 St.,

New York 1, N.Y.-2Rockbar Corp. (Goodman) 650 Halstead Ave.,

Mamaroneck, N.Y.-1-2Saxton Products, Inc., 1661 Boone Ave., New

York 60, N.Y.-1Setchell-Carlson, Inc., New Brighton, St. Paul

12, Minn. -1-2Smolin Labs., Woodbrook Dr., Springdale,

Conn. -2Sonotone Corp., Elmsford, N.Y.-2Stephens Trusonic Inc., 6538 Warner Dr., Cul-

ver City, Colif.1-2Stromberg-Carlson, Special Products Div., 1400

E. Goodman St., Rochester 3, N.Y.-1-2Tandberg of America, 10 E. 52 St., New York

22, N.Y -2Tannoy (America) Ltd., P.O. Box 177, E. Nor-

wich L.I., N.Y.-1-2United Audio Products (Wigo), 202 E. 19 St.,

New York 3, N.Y.-2Universal Woodcrafters Inc., La Porte, Ind. -

1 -2University Loudspeakers, Inc., 80 S. Kensico

hite Plains, N.Y.-1-2Utah

Ave.,kadio& Electronic Corp., 1124 E. Frank-

lin St., Huntington, Ind. -1-2V -M Corp., Benton Harbor, Mich. -1-2Weathers Industries, 66 E. Gloucester Pike, Bar-

rington, N.J.-1Webcor Inc., 5610 W. Bloomingdale Ave., Chi-

cago 39, 111.-2Webster Electric Co., 1900 Clark St., Racine,

Wis.-2Wellcor. Inc.. 1218 N. Wells St., Chicago 10.

111.-iWells -Gardner & Co., 2701 N. Kildare Ave.,

Chicago 39, 111.-1White Inc., Stan, 725 S. LaSalle St., Chicago

5, 111.-1-2Whitley Electronics, Inc., 411 S. Chauncey St.,

Columbia City, Ind. -1-2

1 0 -TAPEBlank 1

Prerecorded stereo 2

Audio Devices Inc., 444 Madison Ave., NewYopk 22, N.Y.-1

Audio Fidelity, Inc., 770 11 Ave., New York,N.Y.-2

Audio -Master Corp., 17 E. 45 St., New York 17,N Y.-2

Concertapes, Inc., P.O. Box 88, Wilmette, 111.-2Cook Laboratories, Inc., 101 2 St., Stamford,

Conn. -2Counterpoint Recordings, Inc., 333 6 Ave.,

New York 14, N.Y.-2

Duotone Co., Locust St., Keyport, N.J.-1Elektra Corp., 361 Bleecker St., New York 14,

N.Y.-2Ercona Corp., 16 W. 46 St., New York' 36, N.Y.

-1Ferrodynamics Corp., Gregg St. & Route 17,

Lodi, N.J. (Sonoramic)-1Fidelitone Inc., 6415 Ravenswood Ave., Chi-

cago 26, 111.-1Fidelity Distributors, 7803 Sunset Blvd., Holly-

wood 46, Calif. -2Int'l Pacific Recording (Omegatape), 854 N.

Vine St., Hollywood 38, Calif. -2Lafayette Radio, 165-08 Liberty Ave., Jamaica

33, N Y.-1Livingston Audio Products, P.O. Box 202, Cald-

well, N.J.-2Minnesota Mining & Mfg. Co., 900 Bush St.,

St. Paul 6, Minn. -1National Tape Library, 2413 Penna Ave., N.W.,

Washington 7, D.C.-2ORRadio Industries Inc. (Irish), Shamrock Cir-

cle, Opelika, Ala. -1Reeves Soundcraft Corp., 10 E. 52 St., New

York 22, N.Y.-1Smolin Labs., Woodbrook Dr., Springdale,

Conn -2Stere-O-Craft, Div. Craft Recording Corp., 1650

Broadway, New York, N.Y.-2Stereophony Inc., 112 Oak Plaza, St. Paul 9,

Minn. -2Stereo Sound Studios, 238 E. 26 St., New York

10, N.Y.-2Tandberg of Americo, 10 E. 52 St., New York

22 N.Y.-1Urania Records, 233 Main St., Belleville 9,

N.J.-2Vanguard Recording Society, 256 W. 55 St.,

New York 19, N.Y.-2Vox Productions (Stereovox), 236 W. 55 St.,

New York 19, N.Y.-2Westminster Recordings Co., 275 7 Ave., New

York 1 N.Y.-2Zodiac Recording Co., 501 Madison Ave.,

New York 22, N.Y.-2

1 1 -TAPE RECORDERS, PLAY-BACKS, & ACCESSORIES

Accessories 1

Heads, stereo 2Recorders & Playbacks, stereo 3

Alonge Products Inc., 163 W. 23 St., NewYork 11, N.Y.-1

American Electronics, Inc., 9449 W. JeffersonBlvd., Culver City, Calif. -1-2-3

American Geloso Electronics, Inc., 312 7 Ave.,New York 1, N.Y.-1

American Microphone Mfg. Co., 412 S. WymanSt., Rockford, 111.-2

Ampex Audio Inc., 1020 Kifer Rd., Sunnyvale,Calif. -1-3

Amplifier Corp. of America, 398 Broadway,New York 13, N.Y.-3

Audio Devices Inc., 444 Madison Ave., NewYork 22, N.Y.-1

Audiogersh Corp., 514 Broadway, New York12, N.Y.-3

Audio -Master Corp., 17 E. 45 St., New York 17,N.Y.-2

Bell Sound Systems, 555 Marion Rd., Columbus7, Ohio -1-3

Berger Communications, 109-01 72 Rd., ForestHills, N.Y.-2

Born Co., David, P.O. Box 500, Paramus, N.J.-

Columbia Records, 799 7 Ave., New York 19,N.Y.-3

Electronic Applications, 194 Richmond HillAve., Stamford, Conn. -2-3

Ercona Corp., 16 W. 46 St., New York 36, N.Y.-1-2-3

Fidelitone Inc., 6415 Ravenswood Ave., Chi-cago 26. 111.-1

General Kinetics Inc., 555 23 St., S., Arlington2, Va.-1

Inn Radio & Electronics Corp., S. 17 St. &Mishawaka Rd., Elkhart, Ind. -3

Lafayette Radio 165-08 Liberty Ave., Jamaica33, N.Y.-3

Lipps Eng'g Edwin A., 1511 Colorado Ave.,Santo Monica, Calif. -1-2

Magnecessories Box 6960, Washington 20,D.C.-1

Magnecord Div., Midwestern Instruments, P.O.Box 7186, Tulsa, Okla. -3

Marco Industries, 3rd & Franklin Sts., Womels-dor1, Pa. -1

Metzner Eng'g Corp., 1041 N. Sycamore Ave.,Hollywood 38, Calif. -3

Michigan Magnetics, Inc., Vermontville, Mich. -3

Microtran Co., 145 E. Mineola Ave., ValleyStream, N.Y.-1

North American Philips Co., 230 Duffy Ave.,Hicksville.Y.-3

Co.,CNortronics 1015 S. 6 St., Minneapolis 4,Minn. -1-2

Pentron Corp., 777 S. Tripp Ave., Chicago 24,111.-1-2-3

Permoflux Products Co., 4101 San FernandoRd., Glendale 4, Calif. -3

Pro -Tex Reel Band, 2108 Payne Ave., Cleve-land 14 Ohio -1

Radio Corp. of America, Cherry Hill, DelawareTwp., Camden 8 N.J.-8

Reiter Co., F. 3340 Bonnie Hill Dr., Hollywood28, Calif. -1

Roberts Electronics, 1028 N. LaBrea, Holly-wood 38, Calif. -I-3

Robins Industries Corp., 36-27 Prince St.,Flushing 54, N.Y.-1

Saxton Products, Inc., 1661 Boone Ave., NewYork 60, N.Y.-1

Scott Instrument Labs., 17 E. 48 St., NewYork 17, N.Y.-1

Shure Bros., 222 Hartrey Ave., Evanston, 111.-2Smolin Labs., Woodbrook Dr., Springdale,

Conn. -3Superscooe, Inc. 8520 Tujunga Ave., Sun

Valley, Calif. -3Tandberg of America, 10 E. 52 St., New York

22, N.Y.-2-3Tayloreel Corp., 185 Murray St., Rochester 6,

N.Y.- ITelectro Industries Corp., 35-16 37 St., Long

Island City 1, N.Y.-1-2-3Viking of Minneapolis, 9600 Aldrich Ave. S.,

Minneapolis 20, Minn. -1-2-3V -M Corp., Benton Harbor, Mich. -1-3Walsco Electronics Mfg. Co., 100 W. Green

St., Rockford, 111.-1Webcor Inc., 5610 W. Bloomingdale Ave.,

Chicago 39, 111.-1-3Webster Electric Co., 1900 Clark St., Racine,

Wis.-1-2-3Wollensak Optical Co., 20 E. 21 St., Chicago

16, 111.-3

1 2 -TUNERSAM or FM "single ploy" 1

AM & FM "simultaneous play" 2Multiplex adaptable 3

Allied Radio Corp., 100 N. Western Ave., Chi-cago 80, 111.-1-2

Altec Lansing Corp., 1515 S. Manchester Ave.,Anaheim Calif. -1-3

American Geloso Electronics, Inc., 312 7 Ave.,New York 1, N.Y.-1

Ampex Audio, Inc., 1020 Kifer Rd., Sunny-vale, Calif. -2-3

Arkay Radio Kits, 120 Cedar St., New York 6,N.Y.-1-2-3

Bell Sound Systems, 555 Marion Rd., Columbus7, Ohio -1-2-3

Blonder -Tongue Labs., 9 Ailing St., Newark 2,N.J.-1

Bogen Co., David, P.O. Box 500, Paramus,N.1.-1-2-3

Brand Products Inc., (Madison Fielding), 11

Lorimer St., Brooklyn 6, N.Y.-2-3British Industries Corp., 80 Shore Rd., Port

Washington, N.Y.-]Capehart Corp., 216 W. 14 St., New York 11,

N.Y.-1-3DeWold Radio, Div., United Scientific Lab., 35-

15 37 Ave., Long Island City 1, N.Y.-1-2-3Dynamic Electronics -New York Inc., 73-39

Woodhaven Blvd., Forest Hills, L.I., N.Y.-1-2-3

Electronic Development Associates, 125 E. 46St., New York 17, N.Y.-1-2-3

Electronic Instrument Co. (Eico), 3300 NorthernBlvd., Long Island City 1, N.Y.-I-3

Ercona Corp., 16 W. 46 St., New York 36,N.Y.-1

Erie Resistor Corp., 644 W. 12 St., Erie 6, Pa. -1Granco Products, Inc., 36-07 20 Ave., Long

Island City 5, N.Y.-1-2Harman-Kardon Inc., 520 Main St., Westbury,

N.Y.-1-2-3Heath Co., Benton Harbor, Mich. -1Lafayette Radio, 165-08 Liberty Ave., Jamaica

33, N.Y.-1-2-3McIntosh Lob. Inc., 2 Chambers St., Bing-

hamton, N.Y.-1-3Miller Co., J. W., 5917 S. Main St., Los Angeles

3, Calif. -1-2-3Mobil Electronics Mfg. Co., 1111 State Rd. 67

E., Anderson, Ind. -3Pilot Radio Corp., 37-06 36 St., Long Island

City 1, N.Y.-1-2-3Precise Development Corp., 2 Neil Court,

Oceanside, N.Y.-1Precision Electronics Inc. (Grommes), 9101 King

St., Franklin Park, 111.-1-2-3Regency Div., Idea Inc., 7900 Pendleton Pike,

Indianapolis 26, Ind. -1Sargent-Rayment Co., 4926 E. 12 St., Oakland

1, Calif. -1-3Scott Inc., H. H. 111 Powder Mill Rd., May-

nard, Mass. -1-2-3Setchell-Carlson, Inc., New Brighton, St. Paul

12, Minn. -2Sherwood Electronics Labs., 4300 N. Calif. Ave.,

Chicago 18, 111.-1Simpson Mfg. Co., Mark, 32-28 49 St., Long

Island City, 3, N.Y.-1Stromberg-Carlson, Special Products Div., 1400

N. Goodman St., Rochester 3, N.Y.-1Tech Master Corp., 75 Front St., Brooklyn 1,

N.Y.-1-2-3Video Instruments Co., 3002 Penna. Ave.,

Santa Monica, Calif. -1-2Wells -Gardner & Co., 2701 N. Kildare Ave.,

Chicago 39, 111.-1-3Whitley Electronics, Inc., 411 S. Chauncey St.,

Columbia City. Ind. -1


Alphabetical

List of

Manufacturers(Numbers refer to sections

in which products are listed.)

Acoustic Research. Inc., 24 Thorndike St., Cambridge41, Mass. -9

Acre Products Co., 369 Shurs Lane, Philadelphia 28,Pa. -1

Admiral Corp., 3600 W. Cortland St., Chicago 47,111.-7

Allied Radio Corp., 100 N. Western Ave., Chicago 80,111.-1-4-5-7-9-12

Alonge Products, Inc., 163 W. 23 St.. New York 11,N.Y.-11

Altec Lansing Corp., 1515 S. Manchester Ave., Anaheim,Calif. -1-4-5-9-12

American Electronics, Inc., 9449 W. Jefferson Blvd.,Culver City, Calif. -4-11

American Geloso Electronics, Inc., 312 7 Ave., New York1, N.Y.-5-11-12

American Loudspeaker Div., Contemporary American Fur-niture, 1821 Berteau, Chicago 13, 111.-9

American Microphone Mfg. Co., 412 S. Wyman St.,Rockford. 111.-2-3-5-11

American Phono Needle Co., 1 Continental Ave., ForestHills 75, N.Y.-6

Ampex Audio, Inc., 1020 Kifer Rd., Sunnyvale, Calif. -1-4-7-9-11-12

Amplifier Corp. of America, 398 Broadway. New York13, N.Y.-11

A.R.F. Products, Inc., 7627 Lake St., River Forest,111.-1-4-7-9

Argos Products Co., 301 Main St., Genoa, 111.-9Arkay Radio Kits, 120 Cedar St., New York 6, N.Y.-1-12Arnhold Ceramics Inc.. Isophon Div., 1 E. 57 St., New

York 22, N.Y.-9Astatic Corp.. Harbor & Jackson Sts., Conneaut. Ohio -2-

3-5-6Atlas Sound Corp., 1449 39 St., Brooklyn 18, N.Y.-9Audio Devices, Inc., 444 Madison Ave., New York 22,

N.Y.-10-11Audio Fidelity, Inc., 770 11 Ave., New York, N.Y.-8-10Audiogersh Corp., 514 Broadway, New York 12, N.Y.-2-

3-4-9-11Audio -Master Corp.. 17 E. 45 St., New York 17,

N.Y.-7-10-11Audiospeaker Labs., 1114 E. Emporia St., Ontario,

Calif. -9Barker Sales Co., 339 S. Broad Ave., Ridgefield, N.J.-1-

2-9Becker Electronic Mtg. Corp., 1091 Rockaway Ave.,

Valley Stream, N.Y.-9Bell Sound Systems, 555 Marion Rd., Columbus 7,

Ohio -1-11.12Berger Communications, 109-01 72 Rd., Forest Hills,

N.Y.-2-6-7-9-11Blonder -Tongue Labs., 9 Ailing St., Newark 2, N.J.-1-4-

9-12Bogen Co., David, P.O. Box 500, Paramus. N.1.-1-3-

4-11-12Bozak Sales Co., R. T., Box 1166, Darien, Conn. -9Bradford Audio Corp., 27 E. 38 St., New York 16,

N.Y.-9Brand Products Inc. ( Madison Fielding), 11 Lorimer

St., Brooklyn 6, N.Y.-1-12British Industries Corp., 80 Shore Rd., Port Washington,

N.Y.-1-3-4-7-9-12Cabinart Div. G&H Wood Products. 99 N. 11 St.,

Brooklyn 11, N.Y.-9Calif. Cabinet Co., 522 S. San Pedro St., Los Angeles

13, Calif. -9Capehart Corp., 216 W. 14 St., New York 11. N.Y.-1-

4-7-9-12CBS-Hytron, 100 Endicott St., Danvers, Mass. -2Cletron, Inc., 1974 E. 61 St., Cleveland 3, Ohio -9Columbia Records, 799 7 Ave., New York 9, N.Y.-8-11Components Corp., 106 Main St., Denville, N.1.-1-3-4-

7-8Concertapes, Inc.. P.O. Box 88. Wilmette, 111.-8-10Cook Labs.. Inc., 101 2 St., Stamford, Conn. -1-8-10Counterpoint Recordings Inc., 333 6 Ave., New York,

14, N.Y.-8-10Decca Records, 50 W. 57 St.. New York 19, N.Y.-8DeRo Electronics, 134 Nassau Rd., Roosevelt, L.I.,

N.Y.-1-7-9DeWald Radio, Div., United Scientific Labs., 35-15 37

Ave., Long Island City 1, N.Y.-1-12Duotone Co., Locust St., Keyport, N.J.-2-5-6-7-9-10Dynaco Inc., 617 N. 41 St., Philadelphia 4, Pa. -1Dynamic Electronics -New York Inc., 73-39 Woodhaven

Blvd., Forest Hills, 1.1., N.Y.-1-4-7-9-12Electron Enterprises, 6917 W. Stanley Ave.. Berwyn,

111.-1-4-7-9Electronic Applications, 194 Richmond Hill Ave., Stam-

ford, Conn. -1-3-4-5-9-11Electronic Development Associates, 126 E. 46 St., New

York 17, N.Y.-1-4-12

For limitedbudgetstereo...

See your Quam distributoror write us directly forcomplete information on the fullline of Quam Hi-Fi Speakers-extended range, tweeters,woofers, coaxials.

Quam Hi-Fi Speakers performas well as or better than hi-fi speakers

costing up to twice as much.. because their design emphasizes

performance rather than

non-functional decorative features.

Quom Hi-Fi Speakers offer you theperfect way to keep within your

customer's budget without

compromising the quality of thesystem. Quam Hi-Fi Speakers

represent the accumulated

skill and experience ofthirty years of fine

speaker manufacturing.

QUAM-NICHOLS CO.226 EAST MARQUETTE ROADCHICAGO 37, ILLINOIS


Ronette . . . world's most advanced stereo cartridgesRONETTE NEW STEREO CAITTRIDGES exceed industry standards for monauraland stereo high fidelity. These superbly designed dual element cartridges . . .

both single stylus and turnover . . . are 100% compatible with standard LP's,giving them new tonal brilliance. RONETTE STEREO CARTRIDGES offercleanest channel separation and high compliance so necessary for long record

' life and listening -pleasure with new stereo discs. Designed for hum -free per-formance in changer and transcription arms. RONETTE Transcription Arms areavailable with stereo cartridges.

BINOFLUID BF -40: Single dual-purposestylus .75 mil sapphire or diamond: 3 and 4terminal models available.

RONETTE STEREO CAR-TRIDGES have' been ac-claimed "best by test" byindustry's leading editors andanalysts.

STEREO OV TURNOVER: 4Terminals: 2.5 and .75 mil sap-phire or diamond styli.

SPECIFICATIONS:Channel Separation: 26-28 dbResponse: 20 to 15,000 cyclesConstruction: Parallel dual elements, four

pinsCompliance: 3.5 x 10.: cm,dyne vertical and

horizontalOptimum Stylus Pressure: 4-6 gramsStylus: Sapphire or Diamond

Write for FREE catalog of complete DINETTE line of cartridges, microphones and pickuparms, for ultra-Dlelity audio reproduction

Ronette ACOUSTICAL CORPORATION, 190 Earl Avenue, Lynbrook, New York


for Ultimate Fidelity

outstanding hon-ors bestowed, un-solicited, by mostrecognized testingorganizations.

No matter what your source of music-FM, your own discs, or tape -youwill enjoy it at its best coming fromSherwood's com plete home m usic center... most honored of them all ! Sherwoodtuners for example

First to achieve under one microvoltsensitivity for 20 db FM quieting in-creases station range to over 100 miles.Other important leatures include thenew "Feather -Ray" tuning eye, auto-matic frequency control, flywheel tun-ing output level control and cathode -follower output.

Model S-2000 FM -AM Tuner 5139.50 net

Model S-3000 FM (only) Tuner $99.50 net

For complete specifications, write De t. ET -9

SHERWOODELECTRONIC LABORATORIES. INC.

2802 West Cullom Avenue, Chicago 18, Illinois

The "complete high fidelity home music center."

Electronic Instrument Co. (Eico). 3300 Northern Blvd.,Long Island City 1, N.Y.-1-9-12

Electro-Sonic Labs., 35-54 36 St., Long Island City 6,N.Y.-2-3

Electro-Voice, Inc., Buchanan, Mich. -1-2-5-9Electrovox Co. (Walco), 60 Franklin St., East Orange,

N.J.-4-6-7Elektra Corp., 361 Bleecker St., New York 14,

N.Y.-8-10Emerson Radio & Phone. Corp., 14 & Coles Sts., Jersey

City 2. N.J.-7Ercona Corp., 16 W. 46 St., New York 36, N.Y.-1-2-

3-4-5-9-10-11-12Erie Resistor Corp., 644 W. 12 St., Erie 6, Pa. -1-2-12Fairchild Recording Equipment Corp., 10-40 45 Ave.,

Long Island City 1, N.Y.-1-2-3-7Fanon Electric Co., 98 Berriman St., Brooklyn 8.

N.Y.-1-4-7Federal Electronics Sales, Federal Electronics Bldg.,

Rockville Centre, L.I., N.Y.,-2Fen -Tone Corp., 106 5 Ave., New York 11, N.Y.-1-2-3-

4-5-6-7Ferrodynamics Corp., Gregg St. & Route 17, Lodi, N.J.-

(Sonoramic)-10Fidelitone Inc., 6415 Ravenswood Ave., Chicago 26,

111.-6-7-10-11Fidelity Distributors, 7803 Sunset Blvd., Hollywood 46.

Calif. -8-10Fourjay Industries, 2360 W. Dorothy Lane, Dayton 39,

Ohio -9General Electric Co., Specialty Electronic Components

Dept., W. Genesee St., Auburn, N.Y.-1-2-3-6-7-9General Kinetics Inc., 555 23 St., S., Arlington 2, Va.

-11Glaser -Steers Corp., 20 Main St., Belleville 9, N.J.-3Granco Products. Inc.. 36-07 20 Ave., Long Island City

5, N.Y.-7-9-12Greene Co., L. Charlton, 314 Washington St., Newton

58, Mass. -1.7-9Hallmark Electronics Corp. (Paramount), 383 Concord

Ave.. New York 54, N.Y.-7-8-9Harman-Kardon Inc., 520 Main St., Westbury, N.Y.-1-12Hartley Products Co., 521 E. 162 St., New York 51,

N.Y.-9Heath Co.. Benton Harbor, Mich. -1-2-3-7-9-12Int'l Pacific Recording (Omegatape), 854 N. Vine St.,

Hollywood 38, Calif. -8-10Int'l Radio & Electronics Corp., S. 17 St. & Misha-

waka Rd., Elkhart, Ind. -11Jensen Industries, 7333 W. Harrison St., Forest Park,

III. -2-6Jensen Mfg. Co., 6601 S. Laramie Ave., Chicago 38.

111.-9Klipsch & Associates, Hope, Ark. -9KLH Research & Devel. Corp., 30 Cross St., Cambridge,

Mass. -9Lafayette Radio, 165-08 Liberty Ave., Jamaica 33,

N.Y.-1-2-3-5-9-10-11-12Lansing Sound, Inc., James B., 3249 Casitas Ave., Los

Angeles 39, Calif. -9Leslie Creations, Lafayette Hill, Pa. -7Lipps Eng'g.. Edwin A., 1511 Colorado Ave., Santa

Monica. Calif. -11Livingston Audio Products. P.O. Box 202, Caldwell,

N.J.-10London Records, 539 W. 25 St., New York 1, N.Y.-8Lowell Mfg. Co., 3030 Laclede Station Rd., St. Louis,

Mo.-9Luxo Lamp Corp., 102 Columbus Ave., Tuckahoe, N.Y.-5McIntosh Lab. Inc., 2 Chambers St., Binghamton, N.Y.

1-12Magnavox Co., 2131 Rueter Rd., Fort Wayne, Ind. -7Magnecessories, Box 6960, Washington 20, D.C.-11Magnecord Div., Midwestern Instruments, P.O. Box 7186.

Tulsa, Okla. -11Marantz Co., 25-14 Broadway, Long Island City 6. N.Y.

-1Marco Industries, 3rd & Franklin Sts., Womelsdorf, Pa.

Mercury Records Corp., 35 E. Wacker Dr., Chicago 1.111.-8

Metzner Eng'g Corp.. 1041 N. Sycamore Ave., Holly-wood 38, Calif. -3-11

Michigan Magnetics, Inc., Vermontville, Mich. -11Microtran Co., 145 E. Mineola Ave., Valley Stream,

N.Y.-7-11Miller Co., J. W., 5917 S. Main St., Los Angeles 3,

Calif. -12Miller Mfg. Co., M. A., 4 & Church St., Libertyville,

111.-2-4-6-7Minnesota Mining & Mfg. Co., 900 Bush Ave.. St.

Paul 6, Minn. -10Mobil Electronics Mfg. Co., 1111 State Rd., 67 E.,

Anderson, Ind. -9-12Motorola, Inc., 4545 W. Augusta Blvd., Chicago 51, III.

-7Musical! Corp., 4512 W. Jefferson, Los Angeles 16,

Calif. -1-7National Tape Library, 2413 Penna. Ave., N.W., Wash-

ington 7, D.C.-10Neshaminy Electronic Corp., Neshaminy, Pa. -9Newcomb Audio Products Co., 6824 Lexington Ave.,

Hollywood 38, Calif. -1North American Philips Co., 230 Duffy Ave., Hicksville,

N.Y.-5-9-11Nortronics Co., 1015 S. 6 St., Minneapolis 4, Minn. -

1 -4-11Olympic Radio & Television, 34-01 28 Ave., Long

Island City 1, N.Y.-4-7-9ORRadio Industries, Inc (Irish), Shamrock Circle Ope-

lika, Ala. -10Oxford Components, Inc., 556 W. Monroe St., Chicago 6,

111.-9Pentron Corp., 777 S. Tripp Ave., Chicago 24, 111.-1-4-

9-11Permoflux Products Co., 4101 San Fernando Rd., Glen-

dale 4, Calif. -1-9-11Pfanstiehl Chemical Corp.. 104 Lake View Ave., Wau-

kegan, 111.-6Philco Corp., "C" & Tioga Sts., Philadelphia 34, Pa. -7

Pickering & Co., Sunnyside Blvd., Plainview, L.I., N.Y.-2-3-4-6-9

Pilot Radio Corp., 37-06 36 St., Long Island City 1,N.Y.-1-4-7-9-12

Powers Co., J. J., 1317 S. 5 Ave., Maywood, 111.-1-4-9Precise Development Co., 2 Neil Court, Oceanside, N.Y.-

1-7-12Precision Electronics Inc. (Grommes), 9101 King St.,

Franklin Park, 111.-1-12Pro -Tex Reel Band, 2108 Payne Ave., Cleveland 14.

Ohio -11Quam-Nichols Co., 226 E. Marquette Rd., Chicago 37.

111.-9Bacon Electric Co.. 1261 Broadway, New York 1, N.Y.-9Radio Corp. of America, Cherry Hill, Delaware Town-

ship, Camden 8, N.J.-7-11Radio Corp. of America, RCA Records Div., 155 E. 24

St., New York, N.Y.-8Radio Eng'g Co., Inquirer Bldg., Philadelphia 30, Pa. -3Radio Merchandise Sales, 2016 Bronxdale Ave.. New

York 62, N.Y.-9Radio Music Corp.. 84 S. Water St., Port Chester, N.Y.-

1-2-3Recoton Corp.. 62-35 Barnett Ave., Long Island City 4,

N.Y.-2-6-7Reeves Soundcraft Corp.. 10 E. 52 St., New York 22.

N.Y.-10Regency Div., Idea Inc., 7900 Pendleton Pike, Indiana-

polis 26. Ind. -1-12Reiter Co., F., 3340 Bonnie Hill Dr., Hollywood 28,

Calif. -11Rek-O-Kut Co., 38-19 108 St., Corona 68, N.Y.-3-4Revere Camera Co., 320 E. 21 St., Chicago 16, 111.-4Riemer Co., David, 601 W. 26 St., New York 1, N.Y.-

3-5-7-9Roberts Electronics, 1028 N. La Brea, Hollywood 38.

Calif. -1-4-11Robins Industries Corp., 36.27 Prince St., Flushing 54.

N.Y.-7-11Rockbar Corp., 650 Halstead Ave., Mamaroneck, N.Y.-

3-9Ronette Sales Corp., 190 Earle Ave., Lynbrook, N.Y.-2-3Sargent-Rayment Co., 4926 E. 12 St., Oakland 1, Calif.

1-12Saxton Products, Inc., 1661 Boone Ave., New York 60,

N.Y.-9-11Scott Inc., H. H., 111 Powder Mill Rd., Maynard,

Mass. -1-2-3-4-12Scott Instrument Labs., 17 E. 48 St., New York 17,

N.Y.-11Setchell-Carlson, Inc., New Brighton, St. Paul 12,

Minn. -1-7-9-12Sherwood Electronics Labs., 4300 N. Calif. Ave., Chi-

cago 18, 111.-1-12Shure Bros., 222 Hartrey Ave., Evanston, 111.-2-3-5-6-11Simpson Mfg. Co., Mark, 32-28 49 St., Long Island

City 3, N.Y.-1-12Smolin Labs., Woodbrook Dr., Springdale, Conn. -3-4-8-9

-10-11Sonotone Corp., Elmsford, N.Y.-2-5-9Stephens Trusonic Inc.. 8538 Warner Dr., Culver City,

Calif. -5-9Stere-O-Craft, Div. Craft Recording Corp., 1650 Broad-

way, New York, N.Y.-8-10Stereophony Inc.. 112 Oak Plaza. St. Paul 9, Minn. -10Stereo Sound Studios. 238 E. 26 St.. New York 10.

N.Y.-8-10Stevens Products, Inc., 86 Main St., East Orange, N.J.-7Stromberg-Carlson, Special Products Div., 1400 N.

Goodman St., Rochester 3, N.Y.-1-3-4-7-9-12Superscape, Inc., 8520 Tujunga Ave., Sun Valley, Calif.

-11Tandberg of America, 10 E. 52 St., New York 22. N.Y.

-9-10-11Tannoy (America) Ltd., P.O. Box 177, E. Norwich, L.I.,

N.Y.-1-2-5-9Tayloreel Corp., 185 Murray St., Rochester 6, N.Y.-11Tech Master Corp., 75 Front St., Brooklyn 1. N.Y.-1-4-

12Telectro Industries Corp., 35-16 37 St., Long Island

City 1, N.Y.-1-4-7-11Televex Co., 46 Lakeview Ave., Yonkers, N.Y.-2-6Thorens Co., Thorens Ave.. New Hyde Park, N.Y.-3Turner Co., 909 17 St., N.E.. Cedar Rapids, Iowa -5United Audio Products, 202 E. 19 St.. New York 3,

N.Y.-2-3-7-9Universal Woodcrafters Inc., La Porte, Ind. -1-9University Loudspeakers. Inc., 80 S. Kensico Ave.,

White Plains. N.Y.-9Urania Records, 233 Main St., Belleville 9, N.J.-8-10Utah Radio & Electronic Corp., 1124 E. Franklin St.,

Huntington, Ind. -9Vanguard Recording Society, 256 W. 55 St., New York

19, N.Y.-8-10Vidaire Electronics Mfg. Corp.. 44 Church St., Baldwin,

L.I., N.Y.-7Video Instruments Co., 3002 Penna. Ave.. Santa Monica,

Calif. -1-12Viking of Minneapolis. 9600 Aldrich Ave. S., Minnea-

polis 20, Minn. -4-11V -M Corp.. Benton Harbor, Mich. -3-4-7-9Vox Productions, Inc.. 236 W. 25 St., New York. N.Y.-

8-10Walsco Electronics Mfg. Co., 100 W. Green St., Rock-

ford, 111.-7-11Waters Conley Co., 17 E. Chestnut St., Chicago 11,

111.-7Weathers Industries. 66 E. Gloucester Pike, Barrington,

N.J.-1-2-3-4-9Webcor, Inc., 5610 W. Bloomingdale Ave.. Chicago 39,

111.-1-3-4-7-9-11Webster Electric Co., 1900 Clark St., Racine, Wis.-1-2-

4-5-6-9-11Wellcor, Inc., 1218 N. Wells St., Chicago 10. 111.-9

Wells -Gardner & Co., 2701 N. Kildare Ave., Chicago 39.111.-1-4-7-9-12

Wendell Plastic Fabrics Corp., 1220 Broadway, New

York 1, N.Y.-7Westinghouse Electric Corp., Metuchen, N.J.-7

Circle 92-0/ on inquiry form p. 7392 ELECTRONIC TECHNICIAN Stereo, 1959

IN PROFITIN DEALS

IN ACCESSORY

PRODUCTS

IN GUARANTEES

IN NEW ITEMS

DUOTONE CO., INC.Ke)port, New Jersey

In Canada, Charles W. Pointon, Ltd.


Start with the Best-To Hear the Best-

. -111-AV IEDFM

ANTENNASThe FM antenna is the

most important link betweenyour tuner and the station.Poor signal capture cannot

be made up within the tunerand amplifier. So startwith the best to hearthe best - install a

Taco FM antenna.There's a model for

%11=1K7-4111111111% every installation40 requirement, and all

I are available in easy -

416to -install kits with all

necessary transmissionN___ wire and hardware. All

-4, N, models available ingold anodized finish.

FREE! The FM antenna story - send for yourfree copy. The complete details on the whys andwherefores of FM antennas ..

TECHNICAL APPLIANCE CORPORATIONSHERBURNE, N Y.

Circle 93-02 on inquiry form p. 73ELECTRONIC TECHNICIAN Stereo, 1959

Westminster Recordings Co., 257 7 Ave., New York 1,

White Inc., Stan, 725 S. LaSalle St., Chicago 5, 111.-9Whitley Electronics, Inc., 411 S. Chauncey St., Colum-

bia City, Ind. -1-4-7-9-12Wollensak Optical Co., 20 E. 21 St., Chicago 16, 111.-11Zenith Radio Corp., 6001 W. Dickens Ave., Chicago 39,

111.-7Zodiac Recording Co., 501 Madison Ave., New York 22,

N.Y.-8-10

IndustryAssociations

with name of secretaryunless otherwise noted

Acoustical Society of America 335 E 45th St New York17 N Y Wallace Waterfall

American Institute of Electrical Engineers 33 W 39th StNew York 18 N Y N S Hibshman

American Institute of Physics 335 E 45th St New York17 N Y Wallace Waterfall

American Physical Society Pugin Physics Bldg ColumbiaUniversity New York 27 N Y Dr Karl K Darrow

American Standards Assn 70 E 45th St New York 17 N YGeorge F Hussey Jr

Association of Electronic Parts & Equipment Mfrs 11 SLaSalle St Chicago 3 III Kenneth C Prince

Audio Engineering Society P 0 Box 12 Old Cheisea StationNew York 11 NY Cl LeBel

Electronic Development Institute 125 E. 46 St NewYork 17 N Y B Berger

Electronic Industries Assn 1721 De Sales St N W Wash-ington 6 D C James D Secrest

Institute of High Fidelity Mfrs 125 E 23rd St New York10 N Y A. Schwartzman

Institute of Radio Engineers 1 E 79th St New York 21N Y George W Bailey

Instrument Society of America 313 Sixth Ave Pittsburgh22 Pa Wm H Kushnick Exec Director

Magnetic Recording Industry Assn 1555 N Bronson AveLos Angeles 28 Calif Edward A Altschuler ManagingDirector

National Appliance & Radio -TV Dealers Assn 1141 Mer-chandise Mart Chicago 54 III A W Bernsohn Exec VicePres

National Assn of Broadcasters 1771 N St N W Washington6 0 C Everett R Revercomb

National Assn of Electrical Distributors 290 Madison AveNew York 17 N Y Arthur W Hooper Exec Director

National Assn of Music Merchants 222 W Adams StChicago 6 III William R Gard

National Audio -Visual Assn Box 337 Fairfax Va RaySwank

National Electrical Mfrs Assn 155 E 44th St New York17 N Y Joseph F Miller Managing Director

National Electronic Distributors Assn 343 S Dearborn StChicago 4 111 Gail Carter Exec Officer

Phonograph Mfrs Assn 37 W 53rd St New York 19 N YA D Adams

Purchasing Agents of the Radio -TV -Electronics Industry143-30 257th St Rosedale 22 N Y B J TrombollCorres Secy

Radio & TV Executive Society Biltmore Hotel New York17 N. Y Claude Barrere Exec Director

Record Industry Assn of America 1 E 57th St New York22 N Y John W Griffin

Representatives of Electronic Products Mfrs 600 S Michi-gan Ave Room 1219 Chicago 5 III R Edward Stemm

RETMA-See Electronic AssnSociety of Motion Picture & Tv Engineers 55 W 42nd St

New York 36 N Y Charles S StodterWest Coast Electronic Mfrs Assn 1435 S LaCienega Blvd

Los Angeles 35 Calif Cortlandt Van Rensselaer

"And we'll tell the neighbors that I

converted it to stereo!"

for

LOWESThum...noise...microphonicsin a high -p dual triode ..

the

AmperexeE C C 8 3 A PLUG-INREPLACEMENT FOR THE 12AX7

MICROPHONICS:

Negligible in amplifiers requiring aninput voltage of at least 50 my for anoutput of 5 watts. No specialprecautions against microphonicsnecessary even though the tube ismounted in the near vicinity of a loud-speaker with 5% acoustical efficiency.

HUM AND NOISE LEVEL:Better than -60 db relative to 50 mywhen the grid circuit impedance is nogreater than 0.5 megohms (at 60 cps),the center tap of the heater isgrounded and the cathode resistor Isby-passed by a capacitor ofat least 100 mfd.

OTHER Amperex TUBES FORHIGHFIDELITY AUDIO APPLICATIONS:

EL84/61305 9 -pin power pentode; 17 W PP6CA7/EL34 High -power pentode; 100 W PPEF86/6267 Low -noise high -A pentodeECC81/12AT7 Low -noise medium -A dual triodeECCII2/12AU7 Low -noise low -A dual triodeGZ34 Cathode -type rectifier; 250 ma.EZ80/6V4 9.pin rectifier; cathode; 90 ma.EZ81/6CA4 9 -pin rectifier; cathode; 150 ma.

At All Leading ElectronicPorts Distributors

(-IL)

VAT/Amperex =mum

ELECTRONIC CORP.230 Duffy Ave., Hicksville, Long Island, N.Y.


Fromany Point of View,more Experts chooseACROSOUNDULTRA -LINEAR II

60 watt amplifier

DESIGN The combination of patentedULTRA -LINEAR circuitry-plus new HYBRIDFEEDBACK principle-VARIABLE DAMPINGcontrol, and ULTRA STABILITY, represents anew high in the art of amplifier design anexample of ACROSOUND'S latest achieve-ment in AMERICAN Know -How. This superi-ority of design now enables anyone with orwithout any previous knowledge of electronicsto assemble for himself or herself ... (yes!it's that easy!) ... the finest of amplifiers andat a most reasonable cost. in only two hours,

PERFORMANCE By listening test, or by in-struments ... second to none in clarity andfrequency response. Normal level distortion isvirtually unmeasurable-IM 1% or less at 60watts, 120 watts peak. Completely stable ...unaffected by loads, perfect square waves.

QUALITY Every part going into the assemblyof critical and even non -critical circuitry istested and checked to allow no more than

W% variation from ACROSOUND'S stand-ards. Specialized test equipment unavailablecommercially was designed in ACROSOUND'Slaboratories to achieve this result. Everyprinted circuit board is placed in trial opera-tion on a laboratory amplifier. Output tubesare matched by trial and double checked.

COMPONENTS ACRO'S newest TO.600 out.put transformer with special hybrid winding-separates functions of output circuit andfeedback circuit. Heavy duty, completelyassembled, and thoroughly tested, printedcircuit board assures uniformity of performante. Low distortion EL34 output tubes areoperated well within their ratings ensuringlong tube life and optimum performance.PRICE In preassembled kit form so that youmay save money, learn while doing, and havethe proud satisfaction you built the best foronly $75.50 net ... or if you feel you wouldprefer it laboratory assembled it still repre-sents a bargain at $109.50 net.

HEAR IT AT YOUR DEALER NOW!

BE READY FOR ACROSOUND DISTORTIONLESSPRE AMP DESIGNED FOR THE STEREO-PHILE

Experts know why ACRO is best!Others . . . Learn why! Write toACRO PRODUCTS

369 SHURS LANEPHILA. 28 PA.

Master Control

(Continued from page 50)need some attention when the loud-ness level is changed appreciably orwhen the seating arrangement isaltered. A possible solution andsimplification may be in the use ofa recently introduced dual volumecontrol which may be adjusted in-dividually and then operated jointlyby locking the concentric shafts.

A desirable characteristic of abalance control is to be able to bal-ance the output level of each of thetwo channels, one against the other,without altering the overall volumelevel. This can be accomplished bystacking two linear potentiometersand wiring one in reverse order asshown in Fig. 2. Adjusting this con-trol lowers the volume of one chan-nel and increases the volume of theother, thus keeping the total outputat the same level.

It is possible to use a compensatedtype of volume control as a combi-nation loudness contour and vol-ume level adjuster. Provisions maybe employed to switch the compen-sation network out, and leave thecontrol function to handle the vol-ume level only. Still another way isto use separate controls and net-works for each of these functions.

Functions & ModesThe most convenient way to

choose a program source is to beable to turn a switch to the desiredposition. A rotary -selector, multi -gang switch with up to 12 positionsmay be used for this purpose. Thecomplexity of the switch may beminimized by limiting its functionsonly to the job on hand. Furthersimplification can be achieved byusing the same input on the controlbox for more than one programsource. Consideration must be givento the impedance and amplification

Fig. 4-Speaker phasing switch provides aquick way to check for proper stereophasing while listening to a stereo program.

requirements of the program source.Where more than one source has thesame output characteristics, it canbe fed into the same jack on themaster control.

Fig. 3 shows a simple arrange-ment of two switches which can re-verse the two channels, or permitthem to play straight through. It isalso possible to select either channeland feed it into both amplifiers formonophonic listening on both am-plifiers and their respective speakersystems. This in effect doubles theamount of power output.

Other than the balance and vol-ume controls nothing thus far hasgone into the control box that wouldmaterially alter the requirements formatching impedances and other pre-amplifier functions. Manufacturersspecifications for matching andequalization should be followed. Ifthe amplifier and preamplifier do nothave the appropriate circuitry, itmay be built into the control box.Some manufacturers have inputadapters which can be plugged intothe line between the program sourceand the preamp.

In the absence of equalizationnetworks it is possible to set thebass and treble controls for properplayback, but the correct position ofthe controls will have to be prede-termined and marked.

With stereo via FM multiplexthere is a very nice feature: becauseof the sum and difference type ofprogram makeup, the output fromthe difference channel can be ad-justed and faded in. Without thedifference channel, both speakersystems get the same program; theyare virtually in parallel. As the dif-ference channel component isbrought up, the stereo effect ap-pears without abruptly changing theoutput from either speaker. Thismakes quite a sophisticated demon-stration.

This can also be done with otherstereo program source material, butit requires elaborate equipment toconvert the signal to sum and dif-ference components. Just one moreswitch, but not on the master con-trol, to consider. This is a speakerphasing arrangement for only onechannel as shown in Fig. 4. Since itis possible, for several differentreasons, to have stereo program ma-terial, at the output of each ampli-fier, in phase from one programsource and out of phase from an-other, and since the only valid wayto phase speaker systems for stereois by listening to the stereo pro-gram, a phasing switch is most con-venient. This switch can be locatedeither near the amplifier or thespeaker.


Multiplexing


have the same information as therighthand microphone and the leftspeaker will have the same infor-mation that was impressed on theleft microphone.

-(A±B) + (A -B) = 2A( A±B) - (A -B) = 2B

The way the subcarrier is devel-oped is very interesting, and alsovery complex. The problems ofsignal-to-noise ratio, and cross talkare still occupying the full-timeefforts of many engineers. However,sufficient progress has been demon-strated to justify consideration bythe FCC for multiplex broadcasting.The subcarrier for FM multiplexingis nothing more than a continuoussinusoidal signal operating at a fre-quency of over 20,000 cycles. Thereason for selecting an ultrasonicfrequency is to prevent it frombeing heard and thus interferingwith the main program in a regularFM receiver not equipped for mul-tiplex. Also the receiver deemphasisnetwork does much to kill this highfrequency signal and keep it fromgetting into the audio amplifierstages. From 30 kc to 70 kc couldbe used in actual practice. Somework is now going on in approxi-mately the 32 kc to 67 kc range.

At the receiver end, the FM sta-tion is picked up and handled inthe conventional manner up to thepoint just past the second detectorand before the deemphasis net-work.

The A+B portion is allowed togo straight through the receiver toboth amplifiers, while the A -B sig-nal is picked off by a bandpass filterbefore the deemphasis network hasan opportunity to attenuate it. Thissignal is then demodulated andpassed through a phase splitter. Thein -phase part of the A-B signal isfed to one amplifier and the out -of -phase part of the A -B signal isfed to the other amplifier. As wasshown, this action restores the rightand left signals.

Adapters are available for use inthose areas presently experiment-ing with FM multiplex for stereo.These units range in price from ap-proximately $50 to $100.

The FCC has already granted per-mission to some broadcasters to ex-periment with multiplexed stereo -casting on FM, and it looks asthough multiplexed stereo will beanother program source for stereoin the very near future. .

TrueHigh -

Fidelity

See your local radio -television service dealer.

OX F OiRD)

Components, Inc.Subsidiory of Oxford Electric Corp.

556 West Monroe StreetChicago 6, Illinois

Illustrated literatureavailable upon request.

OXFORD 3 -WAY SPEAKERSYSTEMS and

BASS REFLEX CABINETSEr !lance the beauty and comfort of your room while youeshance the sound of your high fidelity. Every room willszarkle with these OXFORD cabinets whether for stereo orin a setting with just ore cabinet. Here is double -dutydesign ... cabinets can be used for horizontal or verticalpositioning ... with use of tapered legs or runners whichcue both supplied. Avail-azle with or withoutOXFORD 3W20 3 -waysceaker systems, to giveyou the best sound repro -c Jction.

Cabinet Model No. A ud iophileNet

BR -IM Red Mahogany. $ 111.00BR -IC Cherry 117.00Bt-I Blonde Oak . 117.00

Complete 3 way speaker tytlemtar oboe* cabinetsModel 3W20 39.00

r.o.s. Factory


When Converting Your Phonoto _Cfereo...Use

The ERIEAUDIO -AMPLIFIER KIT

featuring"PAC" and an ERIE

Printed Wiring Board

MODELPAC -AMP- 1

See and hear it atyour local distributor

or Write fornearest source.

With these Plug-in Components:ERIE "PAC" (Pre -Assembled Components )

ERE PRINTED BOARD TUBE SOCKETS

OUTPUT TRANSFORMER CAPACITORS

F1.1. -ER CAPACITOR TONE CONTROL

VOLUME CONTROL and SWITCH TUBES

SPECIFICATIONS FOR ERIE STANDARD AUDIO -AMPLIFIER

Frequency Response: 30 cycles to 12,000 cycles +0, -3.5 db. Sensitivity: 0.56 volt RMS (input at 1 KC) for 2 watt output. Power -Output: 2 watts Input Impedance: 2 megohms. Output Impedance 4 ohms AC Power Consumption: 17 watts. Overall Dimensions: Oh" L x 45/16"W x37/8 H Shipping Weight: 2 lbs.

DIVISIONERIE RESISTOR CORPORATION

ERIE. PA

ELECTRONIC TECHNICIAN Stereo, 1959Circle 95-02 on inquiry form p. 73

95

ONLYSONORAMICOFFERS HIGH

QUALITY TAPEIN A s,

PERMANENTPLASTICCASE!

WIDE LATITUDE TAPE Protects against dirt. dust, mishandling. Easy to store. Exclusive index system. V -slot selection -finder reel. Tapes easily accessible.

Distortion free, lifetime lut...ication to eliminatesqueal, adhesion, head deposits: Broad

plateau bias assures finest performance on all.recorders, high resistance to abrasion,

print -through, cupping.

For FREE lifetime time -tape ruler, write: T-111FERRODYNAMICS CORPORATION

LODI, NEW JERSEY


Winegard FMAntennas Give YouMaximum ResultsFrom Your FM Tuner

The superior electricalcharacteristics ofWinegard FMantennas exact theultimate in hi-fisound reproductionfrom your FMequipment. Withouta doubt, these arethe finest FMantennas made...permanently goldanodized to give youyears of service.

Write for Freecomplete list of FMstations and folder onWinegard FM and TVantennas.

Model FM3ANon -directional,completely factorypre -assembled. Youcan install it yourselfin just minutes on anysurface. Includesantenna, mast,universal roof mount,fasteners, lead-inwire, set clip. $17.95.

Model FMY8A high gain8 -element directionalyogi. Flat frequencyresponse across entireFM band with 10.2db. gain. Ideal forfringe areas and longdistance reception.Users report receptionup to 200 miles. $22.95.

copyright 1958

Iffnegarri Co.3000 Scotten Boulevard Burlington, Iowa

Stereo Discs


cause the needle to go straight downif both channels are equally pullingin a downward direction. An out -of -phase force, that is, one channelpushing up and the other channelpulling down, will cause the needleto travel laterally to one side or theother depending upon the directionof the forces. Thus the stylus cantravel in any direction dependingupon the forces exerted on it. Fromthis it can be seen that even thoughthe information is cut into thegroove at a 45° angle, the stylus isdisplaced either horizontally or ver-tically or both from the referencegroove at any given moment. Evenif only one channel is modulated,there is a diagonal movement whichconsists of horizontal and verticalcomponents. The RIAA standardspecifies that lateral modulation ofthe stereo disc produce in -phasesignals to the speakers. This in -phase signal condition differs fromthe in -phase mechanical motion ofthe stylus and should not be con-fused.

One of the most difficult -to -understand phenomena of the single -groove stereo record is how thestylus can track a groove that seem-ingly has one sidewall going oneway, and another sidewall going an-other as shown in Fig. 5. Perhapsthis is due to difficulties engenderedby the inability to use old conceptsto explain new ones, and worse still,to at least temporarily discard anyprevious ideas. The first and prob-ably most important misconceptionto eliminate is that the weavingback and forth of the groove's side -walls indicate lateral motion. Thegroove in Fig. 4 has sidewalls goingback and forth in a Mae West fash-ion, yet there is no lateral motionon the part of the stylus. However,this pinching and expanding doesindicate a rising and falling stylus.It is the center of the groove thatdescribes lateral motion.

Since the stylus can assume a po-sition that is displaced both horizon-tally and vertically from a givenreference point, it is possible for thegroove to have different widths, anddifferent lateral displacement fromone instant to the next. Thereforethe groove walls do not appear to besymmetrical. The center line at pointA in Fig. 5 shows lateral movementto the left, and the wider distancebetween the walls shows verticalmodulation in a downward direction.At point B the stylus is riding high

but without any lateral displace-ment. Again there is no horizontaloffset at point C, but the stylus isway down. Point D indicates that thestylus is off to the right but ridingat reference height. If at this pointnot too much confusion has set in,it should be evident that it is possi-ble for a stylus to track such agroove.

This brings up a rather contro-versial point. Since the stylus con-tacts both sidewalls at any giveninstant, and since both its relativewidth and lateral displacementtransmits the intelligence to bothelements in the cartridge, is it cor-rect to say that one wall containsthe intelligence in one channel andthe other wall contains the otherchannel? Where would the needlebe if one wall were left out? Evenso, in the illustration in Fig. 5, theinner sidewall represents the leftchannel which in this case containsa higher frequency signal than theright channel, which in turn is re-sponsible for the shape of the outerwall. It is the combination of thetwo walls and their relative positionwhich provides the information tothe stereo or monophonic cartridge.Suffice it to say that it works, andit is revolutionizing the hi-fi in-dustry.

MICROPHONESCAR1RIDGES

TONE ARMSEARPHONESHARDWARE

Finest Quality Components

At Economy Prices

* Hi-Fi Components availablein various series

* Wide selection of electronichardware

* Rysti Cartridges featureMoisture Resistant elements

* Sold nationally . for replacementor use in original equipment

FOR BIG SAVINGS USE RYSTL . . . Sendfor complete Rystl product and priceinformation

Rystl Distributorships still avail-able . . . inquiries about exclusivefranchises invited

DAVID RIEMER COMPANY, INC.601 West 26th Street, New York 1, N. Y.

Circle 96-02 on inquiry form p. 73 Circle 96-03 on inquiry form p. 7396 ELECTRONIC TECHNICIAN Stereo, 1959

Needles for Stereo

(Continued from page 56)lateral components, which can pro-duce corresponding distortions inboth "45" channels:

1. The 2nd harmonic of lateralcomponents appear in the verticalchannel. At high frequencies this isrelatively unimportant. But . .

2. IM products (difference fre-quencies) from the lateral compo-nents also appear in the vertical.This can produce a buzzing sound onhigh -amplitude, complex high -fre-quency sounds, such as those highimpact items.

3. Lower frequency componentsof vertical movement can intermodu-late the higher frequency lateralcomponents, producing a "dithery"effect in the reproduction.

Stylus Size

There is still another effect due tothe vertical component of the re-cording. The size of the stylus cancause increased 2nd harmonic dis-tortion in the vertical componentplus the production of difference fre-quencies (IM) within these compo-nents, thus exaggerating #2 effectconsiderably. Fig. 3 shows how thepath traversed by a larger needlediffers from the actual vertical com-ponent. Compare the shape of thedotted line with that of the actualcutting. The smaller the needle, themore nearly its path agrees with theoriginal recording.

The answer for this is a smallerstylus, which reduces both pinch ef-fect and its associated distortions,and the dominantly vertical distor-tion. Early experimental stereo rec-ords and styli for them have beenusing a tip radius of 0.7 mil, as com-pared with the standard 1 mil formonophonic LPs and 3 mils for the78s. The RIAA recommendation forthe future is 0.5 mil-and not with-out good reason, from what we haveseen!

But what does reducing tip sizedo? If the pickup design remainsabout the same, the effective compli-ance of the record vinyl at the stylustip will increase, so the resonant fre-quency will come down, unless themass of the stylus and its mountingcomes down proportionately. Thismeans it is more important than everto have a clean mounting.

Reducing tip size, and keeping thestylus pressure the same means thepressure per square inch (which al-ready measures in tons per squareinch) will be radically increased. A

change from 1 mil to 0.5 mil willmultiply this wear -producing pres-sure by about 4 times.

Needle Material

Since the advent of LPs, the tran-sition from steel -to -sapphire -to -diamond has been gaining momen-tum. Now it is widely recognizedthat diamonds are not only the best,but by far the cheapest both for rec-ords and styli. The step to 0.5 milshould multiply this incentive to-ward the use of diamond needles.

Diamonds should be good: accu-rately shaped, precision mounted,and nticropolished. Extra care isneeded when installing these newneedles. The life of a diamond cannot be taken for granted. It shouldbe checked regularly.

It is false economy to get a pickupwith one stylus and expect it to dodual service. Figs. 4 and 5 show what

NORMALPRESSURE

DISTORTEDSHAPE

OF GROOVE

ORIGINAL SHAPEOF GROOVE

GREATERPRESSURE

Fig. 5-Small stylus with normal pressurewill slide along the bottom of the groove inan erratic manner. IBI Increased pressurereduces erratic behavior, but increases wear.

using a large stylus in a smallgroove, or vice versa, will do. Eitherway, if only the regular pressure isused, distortion is apt to result.Fig. 4A shows how a needle, whichis too large but with normal pres-sure, rides high in the groove. Dis-tortion due to a tendency to bounce,and in severe cases serious trackingproblems are introduced such asgroove skipping, and in the case ofchangers, failure to trip the cyclingmechanism. Distorted records andexcessive wear can be expected ifstylus pressure is increased, asshown in Fig. 4B. On the other hand,too small a stylus, with normal pres-sure, has a tendency to move aboutin the bottom of the groove in anerratic maner causing distortion andexcessive needle scratch, as shownin Fig. 5A. Increasing needle pres-sure in this case also results in dis-torted discs and excessive wear. In-creasing the pressure to avoid thisdistortion also results in consider-ably increased wear in the styli.

PRECISION . . .

preciselyfor music!

A pickup preciselydesigned for music!

A stereo pickup withall the compliance,

frequency responseand distortion -free

performance requiredfor the highest quality

music reproduction.This...is the

STANTON Stereo -FLUX VA LV E

Where qualitystarts

and the musicbegins!

The STANTON Model 196UNIPOISE Arm with inte-grated Stereo-FLUXVALVEPickup-$59.85 with replace-able 0.7 mil diamondT -GUARD Stylus.

?he STANTON Model 371Stereo -FLUX VALVE Car-tridge - $29.85 with replace-able 0.7 mil diamondT -GUARD Stylus.

Hermetically sealed for a lifetime of trot,blefree use, the STANTON Stereo -FLUX -VALVE performs in a way no other pickupcan equal. Use it in automatic or manualrecord playing systems.

PHOTOGRAPHED DT MORT WELDON

7aiihase who can hear the difference.

FINE QUALITY HOLM FIDELITY PRODUCTS DI

PICKERING & COMPANY, INC.,Plainview, N. Y.

FLUXVALVE, T -GUARD, UNIPOISE are registered trademarks

Address Dept. M98 for a free copy ofIT TAKES TWO TO STEREO by Wolter 0. Stanton.

Circle 97-01 on inquiry form p. 73ELECTRONIC TECHNICIAN Stereo, 1959 97

FAIRCHILD"sound of quality"

COMPONENTSideal for stereo conversionsideal complete stereo system

232 STEREO CARTRIDGEfinest record reproduction stereo

or monaural

282 STEREO ARM... perfect for 232 STEREO and

Fairchild monaural cartridges

412 SERIES TURNTABLES-1,2 or 4 SPEED

engineered for stereo

248 STEREO PREAMP... full flexibility of control, unusually

accurate equalization

255A POWER AMPLIFIER... ideal second chanel amplifier, or for

both channels of a stereo systemfor complete details, write Dept. T-9

FAIRCHILDRECORDING EQUIPMENT CORP.

10-40 45th Avenue, Long Island City 1, N.Y.Circle 98-01 on inquiry form p. 73

SOUND -ORBITER List $9.952 -CHANNELConstant lone.dance SpeakerControl.Master switchpermits opera-tion of OI-F1set speakers in-dependently ofall remoteloads.One crossover networkservices four sets of woof-ers and tweeters in anycombination. Constant im- Model HFS-4 (4 ohms)pedance maintained withdummy resistive loads. Model HFS-8 (8 ohms)Completely wired. Screwterminals for all connec_Model HFS-16 (16 ohms)Hon,. No soldering.

VELVETONE Crossover Network

For more informationsee your local partsdistributor or write

E xt ends high -frequency rangeof any amplifierand hi -fl system.Channels low fre-quencies to woof-er and high fre-quencies totweeter.Poe on 4. 8 or16 ohm systems.

Model VT -2List $3.95

Dept. H134 NASSAU ROAD, ROOSEVELT, N.Y.


Stereo Glossarybalance control: A differential gain

control, whose function is to in-crease the level in one channel,while reducing it in the other, orvice versa, without affecting theoverall volume level of the stereosystem.

binaural: Two eared; applied to akind of recording to be playedinto separate headphones to createa sense of depth which does notnecessarily reflect actual listeningconditions in the studio or con-cert hall.

cardioid: As applied to microphones,heart -shaped sensitivity pattern.Provides maximum pickup infront, and minimum pickup fromthe rear of the microphone.

compatibility: The ability of a newand old system to be used inter-changeably. Specifically, a stereosystem usable with monophonicprogram source; or stereo pro-gram that can be reproducedmonophonically on a monophonicsystem.

carrier: Unmodulated radio signalused to convey information throughspace.

compliance: Ability to yield or flex.In stylus and cartridge measure-ments it is expressed as an inte-gral number which is equal to thenumber of 10-6 cm moved by 1dyne of force. The higher thenumber the better.

counter: A type of FM demodulator,particularly suitable for a multi-plex subcarrier. It counts the num-ber of cycles and gives an outputproportional to its count at anyinstant.

decoding: In multiplex, a process ofseparating the subcarrier from themain carrier.

difference channel: A combinationof the difference between left andright stereo channels.

focus control: See balance control.forty-five/forty-five: The accepted

type of monogroove stereo record-ing, so named because the stylusmotion for each channel is at a45° angle.

hole -in -the -middle: An effect of adivided sound source sometimesencountered in an area midwaybetween speaker systems. An out -of -phase condition can exaggeratethis effect, as can too widely sep-arated speakers.

integrated: Applied to speakers orenclosure design, arrangement ofspeakers, usually on a commonaxis to create the impression thatthe sound is coming from a pointsource, especially the middle andhigh frequencies (in the samestereo channel).

matrixing: The proces of combiningleft and right channels, to producesum and difference signals. Alsothe reverse process, to restore leftand right channels from the sumand difference signals.

monaural: One eared. Frequentlyused loosely instead of monophonic.

monophonic: Single channel, whetherpresented over one or more speakersystems.

monogroove stereo disc: A stereorecording in which all the programis contained in one groove.

multiplex: A method of simulta-neously carrying one or more ad-ditional radio programs on oneradio transmission within the as-signed bandwidth.

omnidirectional: As applied to mi-crophones, uniform pickup ofsound from all directions.

ping-pong effect: Dissociation due tosome sounds coming first from onespeaker, and then from the other.

stereophonic: Also referred to asstereo. Two or more separatechannels of sound blended ' in alistening area in such a manneras to create a sense of realism anddepth in sound reproduction.

subcarrier: A relatively low ultra-sonic frequency used to acceptmodulation from additional pro-grams, such as a second stereochannel, and then modulating themain radio station carrier.

sum channel: A combination of leftand right stereo channels. It isidentical to the program whichmay be recorded or transmittedmonophonically.

vertical -lateral: A type of stereomonogroove recording in whichone channel is recorded by verti-cal movement and the other bylateral movement of the stylus:as a basic system, this has beenrejected in favor of 45/45.


'aeons

fteciek,

WORLD -ACCLAIMED SHURE

Shure Dynetic moving magnet phonograph cartridgesand pick-up arms are designed to re-create sound withUTMOST accuracy-to satisfy the critical demands ofyour most exacting customers. And, they are made

STEREOsz6.&(6,00,2Si

CARTRIDGE

Model M3D

Provides accuracy and honesty of sound.Is without equal in the re-creation of cleanlows, brilliant highs, and true -to -perform-ance mid -range. Fits 3- and 4 -lead ste-reo transcription -type and changer arms.Completely compatible, plays monauralor stereo. 10 -second stylus replacement.Frequency response: 20 to 15000 cpsOutput level: 5mv per channel at 1000cpsCompliance: 4.0 x 10-6cm per dyneChannel separation: More than 20 db

throughout the critical stereo frequencyrange.

Tracking force: 3 to 6 grams.Price: $45.00 audiophile net. Complete

with 0.7 mil diamond stereo stylus.

jtl iilia

Ai i7

,ryI

hili/7,"111/1,14,"4,,iii'Poul

iiiCARTRIDGES AND TONE ARMS

under custom laboratory conditions. Each unit ischecked electrically, mechanically and acoustically toinsure trouble -free performance that puts an end toprofitless service call-backs.

MONAURALPROFESSIONAL siatt71/7--

CARTRIDGE

Model M5D

Fits record changer and transcription -typearms. Lowest needle talk, no hum pick-up,higher compliance . . . prolongs recordlife, needs no special transformer. Equalsor outperforms cartridges costing up to50% more! Easy stylus replacement with-out removing cartridge from arms.Frequency response: 20 to 20000 cpsOutput level: 21 my at 1000 cpsCompliance: 3 x 10-6cm per dyneTracking force: 3 to 6 gramsPrices: Model M5D-$27.50 net with

.001" diamond stylus (for LP records)Other Dynetic models $15.00 and up

MONAURALSTU D 10

TONE -ARM

1

Tracks at I gram I Impossible to scratchrecords. With integral cartridge, .0007"diamond stylus. The ultimate in highfidelity-reproduces all the sound-evenbeyond the audible spectrum. Pays foritself in prolonged record life-tracks per-fectly at an incredible one -to -two grams.Even plays warped records withresponse. For transcription -type turnta-bles (M-12 for 12" records, M-16 for 16").Frequency response: 20 to 20000 cps ±

2 dbOutput level: 10 my at 1000 cpsCompliance: 7 x 10-6cm per dyneTracking force: 1 to 2 gramsPrice complete: $79.50 audiophile net.

114

Model M16

Write for literature on monaural and stereo cartridges, tone arms, microphones, magnetic recording heads:Shure Brothers, Incorporated, 222 Hartrey Avenue, Evanston, Illinois, Dept. 14-I


s.tkeo

Harman-Kardon stereo instruments are the most

flexible on the market today. Intelligent design assures

ease of operation. The new Duet stereo tuner and

Trio stereo amplifier - make stereo attractive,

effective, inexpensive - and sensible.

THE TRIO, Model A-224, StereoAmplifier - actually embodiesthree excellent instruments inone handsome, compact unit.The Trio is: A complete stereopreamplifier with two separate12 watt power amplifiers (24watt peaks each.) A complete24 watt monaural amplifier (48watt peak.) A 24 watt monaur-al amplifier with complete ster-eo preamplifier arranged toconvert an existing monauralamplifier to stereo. Outstandingfeatures include: Separateganged treble and bass controls,balance control, mode switch,speaker selector switch for localand remote speaker systems,contour control, tape outputfor recording application andrumble filter.

THE TRIO, Model A-224 $99.95the Cage (AC -24) optional 7.00

THE DUET, Model T-224,Stereo Tuner: Monaural! Bin-aural! Whatever the applica-tion, this new tuner is designedto give maximum performance.A superb monaural tuner-theT-224 incorporates separate AMand FM channels for receivingstereo broadcasts through thisone unit. Rear jack makes itadaptable for multiplex recep-tion.While the DUET is an ideal Am/FM monaural tuner-it's specifi-cally designed for the growth instereo broadcasting. As stereobroadcasting grows - the valueof the DUET multiplies for you.Costs just a few dollars morethan conventional monauraltuners! (The DUET incorporatesa simple indexing scale to per-mit easy identification of fivepairs of "stereo" stations).

THE DUET, Model T-224$114.95

Prices slightly higher on the West Coast.

For additional information on Hannan-Kardon stereo and monaural units, sim-ply send a postcard with the word stereoon it to Harman-Kardon, Dept. ET9,Westbury, N. Y.

harman kardon


Use Delco RadioService Parts!

Available everywhere throughElectronic Distributors

associated with ...

TRANSISTORS

8 -inch "Hi-Fi" speaker, No. 8007 offers themost highs, the most lows, the most watts in amedium -price speaker. Designed for replace.ment use and high fidelity audio systems.

Your Delco Radio Electronic Parts Distributor carriesthe complete line, giving you fast, dependable service on the itemsyou'll need for Delco Radio and other radio service work. Delco Radio alsoprovides:

Wide selection of special application parts Effective warranty program Complete technical training program Dealer identification signs

Get the facts today on this truly profitable dealer setup, and grow with General

Motors!

CM VMSveers

SALES]

UMITE0 MOTORS SYSTEM

TUNER PARTS

TRANSFORMERS

DELCO RADIODIVISION OF GENERAL MOTORS, KOKOMO, INDIANA

COILS

VIBRATORS

rll1M1111

IRON CORES

RESISTORS

f

CAPACITORS

CONTROLS


get ready for tomorrow ... today

withrACOLOR TEST

MR EQUIPMENTThe alert service technician knows that his big futureis not just around the corner-it's here today-in color-TV servicing! To get your share of this fast-growingmarket, you need the right kind of equipment. Get theright start! Make the right kind of investment with

RCA PROFESSIONAL COLOR TEST EQUIPMENT

WR-46A VIDEO/DOT CROSSHATCH GENER-ATOR for making static and dynamic con-vergence adjustments in color -TV sets. Video output adjustable in amplitude on

all patterns from 0 to 45 peak v across4000 -ohm load

Vertical bars continuously adjustablefrom 10 to 25 (approx.) bars

Cable connections on back of cabinet Reversible video output polarity Simple connections to TV receivers

WR-61 B COLOR -BAR GENERATOR-essentialfor checking overall operation of color -TVreceivers and for adjusting and trouble-shooting color phasing and matrixing cir-cuits. Amplitude of color subcarrier and color -

burst signal adjustable from front -panelfor checking color synclock action of set

Both rf and video output available-video output has both "+" and "-polarity

RF output voltage, at least 0.01 volt peakto peak; video output voltage-at "Lo"connector, at least 0.25 volt peak to peakacross 75 ohms; 8 volts peak to peakacross 4700 ohms at "High" video outputterminal

Write for technical literature describingthese RCA Test Instruments and for theline flyer describing RCA's complete lineof both color and black -and -white testinstruments.

11 _The Technician Who Needs

[

Test Equipment... is

PAYING FOR IT I "

New

ALREADY

RADIO CORPORATION OF AMERICAElectron Tube Division Harrison, N. J.

RCA Commercial Engineering, Section I -46-WHarrison, New Jersey

Rush me the following literature on RCA professional Test Equipment! CD -57-6 (RCA WR-61B Color Bar Generator) 3F764 (RCA Test Equipment Line Flyer)

CD -57-7 (RCA WR-46A Video/Dot Crosshatch Generator)

Name

Company

Address

City None State

Catalogs & Bulletins(Continued from page 25)

TERMINALS: A new solderless terminalcatalog No. T-70 illustrates terminals inactual size, with schematic drawings,and detailed specifications. Illustratesnew bolt cutter, crimping tool and ter-minal paks, kits and displays. VacoProducts Co., 317 E. Ontario St., Chi-cago 11, Ill. (ELECTRONIC TECH-NICIAN B9-10)

TRANSISTORS: Bulletin E-288 covers anew line of PNP germanium powertransistors which allows the customerto specify his choice of five packages,thirty-six collector -to -base voltages,and large current gains, in 20, 30, or40 -watt sizes. CBS-HYTRON, Danvers,Mass. (ELECTRONIC TECHNICIANB9-4)

TV PICTURE TUBES: A new 12 -page, 3 -color, illustrated brochure outlines thefirm's facilities for the manufacture ofTV picture tubes for the replacementmarket. Includes illustrations of the.various processes in CRT production.Continental Electronics Corp., 1900 W.Allegheny Ave., Philadelphia, Pa.(ELECTRONIC TECHNICIAN B9-5)

ELECTRONIC INSTRUMENTS: A new 12 -pagecatalog groups into sections for easyreference, more than 50 instruments formeasurement and analysis. A summaryof their applications in testing equip-ment and analyzing data is given. Pano-ramic Radio Products, Inc., 514 S. FultonAve., Mt. Vernon, N. Y. (ELECTRONICTECHNICIAN B9-8)

RESISTORS: Bulletin 155 describes new,even smaller, metal film precision re-sistors. Gives details on the increasedresistance range offered by these units,despite their reduced size, and describesnew shapes and lower temperature co-efficient of resistance now established asstandard for these units. Ohmite Mfg.Co., 3696 W. Howard St., Skokie, Ill.(ELECTRONIC TECHNICIAN B9-12)

INDEX: A 48 -page book gives completeinformation for quickly finding dia-grams and service data in 17 "Most -Often -Needed Radio Diagrams" man-uals published by the firm, coveringradio receivers from 1926 to present1958 sets. Includes index to 13 TelevisionServicing Information volumes. Nor-mally the Index sells for 250, but willbe supplied to ELECTRONIC TECH-NICIAN's readers for 50 in stamps forpostage. Write direct to Supreme Pub-lications, 1760 Balsam Rd., HighlandPark, Ill.


attention!

Winegar('TV antenna dealers

coming your way the biggestantenna promotion of the year!

Winegard's "DealerDouble Profits Program"down with the old! up with the gold!

To make this fall your biggest ever for TV antenna profits,just pick up the selling tools from Winegard! They're all wrapped

up in the new Double Profit promotional package that gives

you everything you need to pull the customers in - and sell

twice as much to double your antenna profits.

It's a money-maker you can't afford to miss!

16:4coming soon! see your jobber or write for full details

Winegard Co.3019-9 Scotten Boulevard Burlington, Iowa


1 A ASINE WAVES

frOM 5 C z. to 600 ,kc

1 1 I I 1SQUARE WAVE

from 5 cps to 600 kc

with the

PRECIS -JOT.MODEL

WIDE -RANGE SINE and SQUARE WAVE GENERATOR

The only generator on the market today offering both sine andsquare wave coverage of the subsonic, audio, supersonic and lower RF spectra at amoderate price. The 6 -inch tuning dial has a 12:1 drive ratio and provides an effectivescale length of 85 inches over the 5 tuning bands. Tuning accuracy is within 1%from 100 cps to 600 kc and within 1 cycle below 100 cps. Output is within ±1 dbover each of the 5 bands and within ±1 db from band to band. Distortion is lessthan 1% at the maximum output level of 10 volts (r. m. s.) into 600 ohms. Squarewave rise time is 0.15 ,usec.

The complete PRECISION line, comprisinga wide range of high -quality electronic test instruments, includesthe suitable vacuum -tube voltmeters and oscilloscopes to com-plement the Model E-310 for exacting waveform analysis and fre-quency response tests. Write for detailed new catalog describingand illustrating the entire line.

PRECISION Model ES -550Cathode -Ray Oscillograph $235.00 net

Ideal companion instrument to the E-310s 5 Mc bandwidth 10 my/inch sensitivity

PRECISION test equipment is available and ondisplay at leading electronic parts distributors.

PRECISIONApparatus Company, Inc.--- 70-31 84th Street, Glendale 27, Long Island, New York

,o'' Export: Morhan Exporting Corp., 458 Broadway, N. Y 13, N. Y., U.S.A.4"E Of FR(05 Canada: Atlas Radio Corp., Ltd., 50 Wingold Ave., Toronto 19, Ontario

MANUFACTURERS OF HIGH -QUALITY ELECTRONIC TEST EQUIPMENT FOR OVER 26 YEARS

1100 Vertical

Sweep Circuits


output transformer directly. SectionsV1 and V2 are, in essence, two re-sistance -coupled amplifiers. Theoutput of V1 feeds the input of V2through C313. The output of V2 isfed back to V1 through C312. Twoconditions necessary for sustainedoscillations are thus established, suf-ficient amplification to overcome cir-cuit losses and feedback of an in -phase signal.

One way to troubleshoot thiscircuit is to open one side of capac-itor C312 and feed a 60 -cycle sine -wave into the grid of VI and checkfor presence of signal and relativegain at the plate of V1, and grid andplate of V2. Instead of using an 18 -volt peak -to -peak voltage takenfrom a 6.3 volt filament supply as atest signal, as is a customary prac-tice, the voltage taken from the fila-ment string at pin 5 of this tube is

250 V

INPUT(FROM

SYNCSEPARATOR)

"PHC311

R321}RxR322

R313

R3I7R318R327R328

R

220 V

R319

C312

C313

R2 :332R3I8 R 316

OUTPUT( TO T300)

V2

C5030

Fig. 3-Simplified version of the heart of thesweep section shown in Fig. 1. Plate -coupledmultivibrator serves as oscillator, syncphase invertor, and vertical output circuit.

almost of proper amplitude and moreconvenient. The action of this multi -vibrator circuit is typical. When B+is first applied, one of the stages willconduct slightly more than the other.If V2 starts to conduct more heavily,its plate voltage will decrease morethan the plate voltage of VI, andappear as a negative going signal.This negative going signal is coupledto the grid of V1 and causes V1 toconduct less. The resulting increasein Vl's plate voltage is coupled tothe grid of V2 and causes V2 to con-duct more heavily. This process con-tinues very rapidly until V1 is cut -



NEWNEW

Another importantSprague "First":3 -in -1 Universal Basefor printed wiringboards

Sprague PRINT-LOK*Iytics

with universal basesfor printed wiring boards

simplify servicing...reduce inventory

Sprague's new PRINT-LOK Electrolytic Capacitorshave a newly -developed universal base that's designedto fit all sets. A touch of your pliers is all that'sneeded to adapt PRINT-LOK capacitors to any oneof three different types of printed circuit bases!

How's that for simplified servicing? And just as im-portant, you need only stock a third as many 'lytics aswere required previously. Still another feature-PRINT-LOK capacitors also replace standard twist -base electrolytic capacitors.'Trademark

[ SPRAGUE RESEARCH IS CONSTANTLY PRODUCING NEW AND BETTER CAPACITORS FOR YOU

PRINT-LOK capacitors are hermetically sealed inaluminum cases to give extra long life and top per-formance under extremely high temperatures and highsurge voltages, as well as in high ripple seleniumrectifier circuits.

Sprague's new TV Electrolytic Capacitor Replace-ment Guide K-103 gives complete listings for PRINT-LOK 'lytics as well as standard TWIST-LOK capaci-tors. Get your free copy from your distributor, orsend 10c to cover handling to Sprague Products Co..65 Marshall Street, North Adams, Massachusetts.

don't be vague...insist on SPRAGUE®world's largest capacitor manufacturer


Rep/acewith the

TVmanufacturers'

Easy pigtailinstallation

Hermeticallysealed

No pressurecontacts used

No heat sinksrequired

/1/1471C PT5

SILICON

RECTIFIER

General Instrument Distributor DivisionRADIO RECEPTOR COMPANY, INC.

Subsidiary of General Instrument Corporation240 Wythe Avenue, Brooklyn 11, N. Y. EVergreen 8-6000


off. A steady state condition existsmomentarily at this point, with novarying signal applied to the grid ofV2, its plate current remains con-stant. The coupling capacitor C312now has an opportunity to dischargeitself through the lumped resistanceR1, R319 and B+. When enough ofthe negative charge leaks off, V1 willstart to conduct and send a negativegoing signal to the grid of V2. Thesame sequence of events takes place,only this time V2 is cutoff. The con-ditions for a free running oscillatorare thus established with its fre-quency dependent upon the timeconstant of the coupling capacitorsand their associated resistors. Actualfree running frequency is set slight-ly below the desired 60 cycles toallow the incoming sync pulse to setthe exact speed.

The method used to apply the syncpulse is unusual and interesting, andwhile it has nothing to do with 110°deflection, it is worthwhile to takenotice of it. A positive sync pulse isrequired at the grid of V1 to triggerit into conduction. This action

HI

DC INPUT

$ I

A

N SS N,

[ I

DC INPUT

B

Fig. 4-As direct current flow increases incoil A, the magnetic field increases untilsaturation is reached. When this happensno further increase in the magnetic fieldis possible. If the magnetic fields due todc are cancelled, all of the core mate-rial is then available for the a -c signal.

speeds up the oscillator to the de-sired frequency. Because the incom-ing sync pulse from the syncseparator is negative going it is firstfed to the grid of V2 where its phaseis reversed and then fed to the gridof V1 through C312 and R314. Thisre coupling network also acts as afilter and removes most of the saw -tooth portion and passes the remain-ing positive going sync pulse.

Thermistor Action

Many things happen during thewarm up period, when a set is first



How RCA builds specialprescription grids...extends 6AF4-A life!

RCA's redesign of the 6AF4-A has resulted in minimized slump, product uniformity,and projected average life of 4,000 hours or more!

Here are some of the materials RCA "prescribes" in manufacturing the new 6AF4-A. Thegrid is plated with Palladium, a rare metal capable of withstanding high temperatures.The use of this grid structure minimizes interelectrode leakage, prevents gridloading, and as a result, provides stable tube performance. The cathode,a nickel alloy, is specially selected to reduce interface resistanceand thus minimizes slump. The use of pins which are silver-platedreduces skin effect at ultra high frequencies and improvestuner performance.

All these features, in addition to dynamic life tests, help to assurelong and dependable performance. No wonder RCA's 6AF4-A is tops!

So, here's the #1 lesson in radio, phonograph, and TV service-when ordering tubes for replacement, specify "RCA Tubes only."

atRADIO CORPORATION OF AMERICAElectron Tube Division Harrison, N. J.


Save Time and Effort with these handy

TUBESERVICING

AIDSWALSCO TEST SOCKET ADAPTERS

Now you can make measurements of voltage,resistance, audio and video from the top of thechassis. Save time and work by testing tubecircuits while in full operation. Made of low -loss phenolic, these tube socket adapters havean insulation resistance of 500,000 megohms(40% RH-24° C). High voltage breakdown be-tween elements exceeds 1700 volts AC -DC.Test tabs on adapters are extended for easyuse with prods or alligator clips.Cat. No. Description Dealer Net1949-07 7 -pin miniature $1.651949-08 8 -pin octal 1.551949-09 9 -pin miniature 1.851949-01 Duo -Decal for CRT 1.95

WALSCO SOCKET PROTECTORS

Prevent excess wear and tear of sockets ontube checkers and other electronic equipment.Walsco socket protectors eliminate the neces-sity of checking and replacing original sockets.Time -saving and easy to use. With silver-plated phosphor bronze contacts and pins forlasting service.Cat. No.194619471948

Description7 -Pin Miniature8 -Pin Octal9 -Pin Miniature

110° BASEADAPTERS

Convert 110° CRT typebase to Duo -Decal basefor rejuvenators, testequipment, tubecheckers, etc.

Cat. No. 1944 (RCA )Dealer Net $1.50

Cat. No.1945 (Sylvania)Dealer Net $1.50

Dealer Net$1.95

1.951.95

110° TUBE PINSTRAIGHTENER

For RCA type 110°picture tubes. Theystraighten bent pinsquickly and easily. Mayalso be used as baseprotector. A handytime -saving piece ofequipment.

Cat. No. 1941Dealer Net $ .51

FREE:

NEW WALSCOUBE GUIDE

Eliminates fumblingwhen inserting 9 and 7pin tubes. Center pin oftube guide aligns tubewith center hole ofsocket and guides tubein easily and quickly.Cat. No. 1942 (7 pin)

Dealer Net $ .42Cat. No. 1943 (9 pin)

Dealer Net $ .42

The latest Walsco catalog listing these andthousands of other tools, chemicals, and service

aids that you can use every day. Get your copy free fromyour Walsco distributor or write direct to Walsco.

ELECTRONICS MFG. CO.A Division of Textron Inc.

West Coast Plant: Los Angeles 18, California

MAIN PLANT: 106 W. GREEN ST., ROCKFORD, ILL., U.S.A.In Canada: Atlas Radio Corporation, Toronto 10, Ontario

(Continued from page 106)turned on, resistors, coils, tubes andeven capacitors undergo changes invalue which may cause more or lesscurrent and voltage values to be de-veloped. If the circuit is stable andwell designed, little or no differencein operation is noticed by the setowner. The use of temperature com-pensated components in oscillators,power supplies and many other elec-tronic devices is not new. Thermis-tors exhibit a negative temperaturecoefficient, that is the resistance de-creases as the temperature increases.It is a ceramic like material andavailable in many different shapes,beads, rods, discs, etc. (For more in-formation on thermistors, see page30 in the February 1958 issue ofElectronic Technician.) In this par-ticular application, both thermistorscompensate for voltage and currentvariations due to warm up and am-bient temperature conditions. Bothvertical size and frequency are thusheld fairly constant. ThermistorR323 is located inside the high volt-age cage, where the rise in tempera-ture is just right to cause propercorrective action. This thermistorcontrols the amount of boost voltagefed to the oscillator section and min-imizes height variations. R320 as-sures proper oscillator action forvarying conditions of temperature,current and voltage.

The autotransformer, new yokedesign and smaller picture tube neckhave all contributed to the higherefficiency requirements of the 110°deflection circuits.

130° Deflection

With the advent of the 130° CRTand possibly even higher deflectionangles, even more efficiency willhave to be obtained from these cir-cuits if additional stages, specialpurpose tubes and increased de-mands for power is to be avoided.

For example, the horizontal sweepcircuit in this 110° receiver is ableto improve efficiency still more byfeeding B+ through the horizontaloutput transformer in such a way asto minimize core saturation. Fig. 4Ashows a typical iron core electro-magnet. As the direct current flowis increased the magnetic field in-creases until saturation occurs.When this happens no further in-crease in the magnetic field is pos-sible even though more current isforced through this coil. In part Bof Fig. 4 another winding is addedto the core. The windings of bothcoils are in the same direction, but


wired so that the magnetic fields op-pose each other. If both windings areequal the total magnetic field will bezero regardless of how much dc flowsthrough the coils.

Fig. 5 is a simplified horizontaloutput circuit and shows how theoutput transformer is wired to takeadvantage of this principal. The ar-rows indicate the direction of B+

Fig. 5-Direct current flow, in opposite direc-tions, through the output transformer elimi-nates magnetic fields due to dc and increasesefficiency. AC flows in the usual mann:r.

and boost voltage flow. The currentis flowing from both ends toward themiddle just as in Fig. 4B. By can-celling out the magnetic field due tothe d -c component, all of the corematerial is available for the desireda -c signal.

So far as the a -c signal is con-cerned the hookup looks like a con-ventional autotransformer with ca-pacitor Cl acting as a connectinglink. C2 prevents de from flowingthrough the yoke. Some manufac-turers have been centerfeeding B+through the vertical yoke windings;others have used varying amounts ofB+ to provide electrical centeringcontrol; and still others have blockedthe de component from getting intothe vertical yoke windings. How-ever, most set makers still pass B+through most or all of the outputtransformers winding in one direc-tion. Whether or not this techniquewill also be used in the verticaloutput transformers, either to reducethe amount of iron and size of trans-former, or to increase efficiency forlarger deflection angles yet to come,remains to be seen.

Illustration CreditsSylvania Electric Products, Inc.

Note the improvement

You can easily makemusic sound richer withCentralabCompentrol®Put Centralab Compentrol in your cus-tomers' radios and TV sets, and presto!Sound satisfaction! That's because thisremarkable control with built-in compen-sating circuits provides perfect tonal bal-ance of the highs and the lows-and doesit automatically at any volume level.Unlike ordinary controls, Compentrolbrings out the full richness of the sound. . . brings hi-fi into any living room.Compentrol is easy to install in any radio,TV, or hi-fi set. You merely replace theexisting control . . . no circuit changesrequired.FREE: A booklet describing in detail howthe Compentrol works and how easy it isto install. Write directly to Centralab foryour copy.

Cen

6 MODELS AVAILABLE-Replace standand volume controls without rebuilding.Fit all hi-fi's, record players, radios,TV, pre-amplifi-ers, amplifiers, tuners,and tape recorders.

B5839

/A DIVISION OF GLOBE -UNION INC,./902J EAST KEEFE AVENUE MILWAUKEE 1, WISCONSIN

IN CANADA: 804 MT. PLEASANT ROAD TORONTO, ONTARIO


... another

MALLORYservice -engineered

product

New Contact DesignMakes Mallory Gold Label

VibratorsBetter than

Ever

Capacitors ControlsVibrators Switches Resistors Filters Power Supplies Rectifiers Mercury and Zinc -Carbon

Batteries

It's real news when the best getsbetter . . and that's just what hashappened to Mallory Gold LabelVibrators. The exclusive buttonlesscontact design that enabled thesevibrators to set the replacementservice standard for long life, quietoperation and constant output hasnow been improved.A unique dual -leaf construction pro-vides two contact areas on the samearm . . . assuring positive startingeven if a tiny fleck of dust shouldlodge on one of the contact areas.This feature makes Mallory GoldLabels more than ever the surest -starting vibrators made.Your Mallory distributor has newGold Label Vibrators in stock now.Order from him today.

MALLORYP.P. R. MALLORY 8 CO. Inc.

P. R. MALLORY & CO. Inc., INDIANAPOLIS 6:INDIANA

i-ALLCIW NEWS LETTER

FANON announces a stereophono line, priced $89.95 to$109.95.

HEATH Pres. Robert Erick-son has moved to BECKMAN IN-STRUMENTS as exec VP.

PICKERING has published a12 -page booklet, "It TakesTwo to Stereo."

OXFORD appoints two reps:Weller-Rahe Co., Cleveland;Southern Sales Co., Angola,Ind.

FAIRCHILD sales managerRobert G. Bach has resignedto set up a rep organizationhandling the line in the NewYork area.

TANNOY has introduced theBelvedere enclosure, 26" x18" x 12", finished on foursides, with 12" dual concen-tric speaker @ $195.

RADIO ENGINEERING has an-nounced a record changerwith automatic record re -stacking, which lifts discsto the top of the spindleafter last play, and startsplaying again. Also, auto-matic interval timer pro-vides silence from 10 to 60minutes. Model R11-1 is$195.25 ; Mode1R10, $242.35.

UNIVERSITY has publisheda new 64 -page "Technilog."This fact -packed loud-speaker manual includes nu-merous charts and tables,and technical discussionsof matching, phasing, typeselection, building specs,etc. Price is $1.

ORRADIO July sales are up89% over last year. Says VPNat Welch, "Ordinarily,following the summer pe-riod, we don't experience anupturn in business beforeSeptember, but this year theupswing started in July. Webelieve this to be positiveindication that businesswill be exceptionally goodthis fall."


PENTRON appoints RAYTHEONInternational Div. as ex-clusive overseas distrib-utor.

BRITISH INDUSTRIES ap-points Ed Cornfield salesmanager for Wharfedalespeakers and Riveredge cab-inets. Cornfield was previ-ously executive secretaryof IHFM.

SONOTONE's new approachwith its 4T ceramic turnovercartridge is the inclusionof two 1 -mil needles, elimi-nating the 3 -mil needle.With sapphires, cost is$4.95; bracket is 500 more.

ELECTRO-VOICE announcesthe Model 20 PZT magneticstereo cartridge with 13 myoutput. Stylus is snap -inreplacement type. Offeredin 4 models with diamond andsapphire styli in turnunderand fixed types, pricesrange from $16.50 to $37.50.The company also reportedholding a 3 -day sales andengineering Electro-Acous-tic Seminar. 25 top distrib-utors attended.

RENEWED FM ACTIVITY. In-stitute of High FidelityMfrs. has completed a surveyof 665 FM stations, 319 re-plying. Complete survey re-port, with state breakdownand multiplex data, indi-cates 54 FM stations affili-ated with AM outlets arebroadcasting FM/AM stereo,165 are not, 94 no answer. 8say they are multiplexingstereo, 51 are multiplexingbackground music, 6 are mul-tiplexing both.

JENSEN INDUSTRIES Pres.Karl Jensen challenges theclaim of British widow MariaKillick that her husband in-vented the sapphire stylus.She remarked, "In America Iunderstand $78 million worthof sapphire styli have beensold. I intend to sue allcompanies there which haveinfringed my patent." Crit-icizing the British courtruling in favor of Killickas preposterous, Jensen re-torts that he has a recordolder than Mrs. Killick thatstarts out: "This record isbeing played by a sapphireneedle."

. . . another

MALLORYservice -engineered

product

watch out forshrinkingcapacitance

insist on

ec

foledeeNede

Ever notice how some capacitorsfail before their time? In just afew weeks, especially in a highripple circuit, they begin todevelop hum.

This is due to loss of capacitance,and it's a common ailment ofcapacitors with plain foil cathodes.You'll never have this troublewith Mallory FP's and popularMallory tubular electrolyticsbecause they have etched cathodeconstruction. It's a standardfeature of Mallory electrolyticsthat insures against "missingmicrofarads."See your local Mallory distributorfor full facts on why etchedcathode is important to you-and to your customers!

Capacitors Controls Vibrators Switches Resistors Filters Power Supplies Rectifiers Mercury and Zinc -Carbon

Batteries

MALLORYP.R.P.R. MALLORY 8. CO. Inc.

P. R. MALLORY & CO. Inc., INDIANAPOLIS 6, INDIANA


ELECTRONIC TECHNICIAN September, 1958 1 1 1

GE NARROW BAND KITSNew conversion kits are now avail-

able to help 2 -way radio users to makethe transition from wide -to -narrowband. The FCC still has Docket 12,295pending on the subject of implementingthe rules. Licensees may want to waituntil rules are finalized before makingconversions. However, the new kits takeinto consideration possible require-ments which may result from FCC ac-tion. General Electric CommunicationProducts Dept., Syracuse, N. Y. (ELEC-TRONIC TECHNICIAN 9-36)

Hewlett-Packard VTVMA logarithmic meter movement pro-

viding greater readability and accuracythan previous scales is designed toeliminate optical confusion and to pro-vide an accuracy which is a constantpercentage of the reading. This wasaccomplished by expanding the lowerportions of the voltage scale and byproviding a linear db scale which spread12 db over the full scale length. The400L has two voltage scales from 0.8 to3.2 and from 2.5 to 1. The 12 db scaleis spread across a scale length of 4.9

Testsand Repairs

PictureTue

4PDS(110° 'Tubes

and Color Tubesles Easier

too, With newbAdapter)40

MakesNew Tube Sa

CATHODEREJUVENATOR

TESTER

New (40 Adapter for110° Tubes and Color Tubes

CRT 400 PROVES REAL MONEY-MAKERThousands of servicemen today make moneyand keep customer good -will by checking andcorrecting b&w picture tube troubles with thefamous B&K CRT 400, right in the home withoutremoving tube from set. Restores emission andbrightness. Repairs inter -element shorts and opencircuits. Checks leakage. Indicates picture qualitycustomer can expect. Life Test checks gas contentand predicts remaining useful life of picture tube.Makes new picture tube replacement sales easier!Model 400 (without adapter) Net, $5995NEW MODEL C40 ADAPTER DOUBLES VALUE OF B&K CRTDesigned for use with all B&K Models 400 and350 CRT's. Makes it easy to test and rejuvenate TVcolor picture tubes and 110° picture tubes. Isolatesand detects difficult color troubles. Tests andrejuvenates each gun of the color picture tubeseparately the same way as a black & white tube.Model C40 Adapter Net, 9955See your B&K distributor, or write for Bulletin API 2-T

Makers of CRT, DYNA-QUIK, DYNA-SCAN and CALIBRATOR

B & K MANUFACTURING CO.3726 N. Southport Ave. Chicago 13, Illinois

inches. Each db has five divisions. The400L measures from 0.3 my to 300 v.,from 10 cps to 4 mc. Accuracy is ± 2%of reading or ± 1% of full scale, which-ever is more accurate, to 500 kc. $325.Hewlett-Packard Co., 275 Page MillRoad, Palo Alto, Calif. (ELECTRONICTECHNICIAN 9-26)

Javex MULTI -SET COUPLERSOne antenna in a good signal area is

all that is required for any multi -setinstallation, including FM, by using thenew MI -50 Multi -TV Isolator. A com-munity system of up to 500 TV's can beoperated by using a booster or signalamplifier at the antenna, and MI -50

isolators at each outlet. It is supplied inminiature as well as in intermediate andfull size NEMA design customized wallplate outlets, complete with plug, andsolderless. Javex Electronics, P. 0. Box646, Redlands, Calif. (ELECTRONICTECHNICIAN 9-22)

Ohmite FILM RESISTORSSeries 77 metal film precision re-

sistors are now smaller, yet offer highermaximum resistance than the previousmodels. At the same time, prices ofthese units have been reduced. Tworadial shapes, a tubular shape and a"flat -side" shape which offers spaceeconomy. A radial lead style is also fur-

nished. Resistance range is 25 to 400Kohms. Tolerance is -±-1%. They may beused at full 1/4 watt rating at 150 C or1/2 watt at 105 C. Low reactance andnoise level. Ohmite Mfg. Co., 3695 How-ard St., Skokie, Ill. (ELECTRONICTECHNICIAN 9-9)


Test Equipment


i-f slugs can be adjusted one at atime. If the shape does not improvewith a particular adjustment theslug should be returned to its orig-inal position, and a different onetried. If, to begin with, the responsecurve is radically distorted, a courseadjustment of the i-fs can be rapid-ly made and then touched up thesecond time around.

To include the tuner's response inthe overall alignment check, thelead from the sweep generator istransferred from the mixer stage tothe antenna. Normally antennamatching is an important considera-tion. In most instances the distortionintroduced by the mismatch at theantenna can be discounted, especial-ly if the waveform remains sub-stantially the same, and if the pic-ture is good. However, it is a simple

VIDEO AUDIO

MARKERMARKER

Fig. 5-Excessive bandwidth and reducedgain. Audio marker badly misplaced.

matter to provide a proper dummyantenna. A radical change in theresponse curve is an indication offront-end trouble.

It is common practice to adjustthe tuner oscillator slugs using anoff -the -air signal. Many technicianspeak the sound take -off coil andaudio i-f's by hairline adjustingtechnique and listening for maxi-mum output. However, this equip-ment setup lends itself very nicelyto precision type alignment. It ispossible to use an off -the -air signaland align the oscillator so that thesound and video carriers accuratelyfall in on the proper part of the re-sponse curve. It is also possible toobserve the response of the audioi-f amplifiers and align the audiodetector circuit if necessary. Sincethis equipment is the same as re-quired for other alignment tech-niques, no additional expendituresare required. If the saving in timeand simplification of procedure en-courages more technicians to usealignment equipment, more techni-cians will have more satisfied cus-tomers.

YOU CAN PROFITABLY

SELL.A AND GUARANTEE

44IZI 1:3WIMF

QUALITYIMPORTS

FAMOUS HITACHI RECEIVING TUBES

It pays to replace now with. EUC guaran-teed HITACHI tubes. You give your cus-tomers top quality and better value. Youprotect your service and your profit.You're safe, too-because HITACHI tubesare world -proved for reliable efficiency,fully meet American standards, and arebeing used in American original equip-ment. Most popular types are availablefrom your EUC Distributor.

PROFIT WITH THESE OTHER EUC QUALITY IMPORTS

Make your replacements more profitably and de-pendably with these EUC quality components:CAPACITORS in Tubular By -Pass, Tubular Elec-trolytic, Miniature Tubular, Miniature Electro-lytic, and Ceramic Disc types; High -efficiencyMINIATURE TRANSISTOR TRANSFORMERS; PolyVariCOD VARIABLE CONDENSERS; Quality -con-trolled CARBON RESISTORS; Exceptionally stableTRANSISTORS; and other widely used units. Allare fully guaranteed to meet American standardsand are available in the most popular ranges.

TRANSISTOR RADIO EARPHONESExceptional quality and value have earned nation-wide acceptance for these small, compact, light-weight earphones. Magnetic type receiver providesremarkably fine reproduction. Plastic and metalcase is designed for comfortable fit. Available in3.2 ohm, 15 ohm, 2000 ohm, and 4000 ohm models.

See Your EUC Distributor rwrite for Catalog No. 558-T

DIVISION OF THE SAMPSON CO.2244 S. WESTERN AVE. CHICAGO 8. ILLINOIS

ELECTRONIC TECHNICIAN September, 1958 1 1 3

FOR A

bri hter

Tpicture

Rely on the tube that has always been speci-fied by leading independent set makers.

67 -0/62A0 -)wag

TONG-SOL°Magic Mirror Aluminized

PICTURE TUBESTUNG-SOL ELECTRIC INC., Newark 4, N. J. Sales Offices: Atlanta,Ga.; Columbus, Ohio; Culver City, Calif.; Dallas, Tex.; Denver, Colo.;Detroit, Mich.; Irvington, N. J.; Melrose Park, Ill.; Newark, N. J.;Seattle, Wash.

Maintaining

2 -Way Mobile Radio

How To Make Money

In This Growing Field.

No mobile -radio system can be better than its main-tenance. The original installation can be of the best, butunless it is properly maintained the operating costs, thetechnical performance, and the conformance with FCCregulations all will degrade as time goes on. Mobile -maintenance work needs to be considerably above thecalibre of the average home -radio service, and by thesame token the rewards should be larger.

All mobile -radio installations must operate accordingto regulations of the Federal Communications Commis-sion. The FCC classifies these installations as the Safetyand Special Radio Services, which include such widelydiversified users as:

Police Depts.Fire Depts.Gas Cos.DoctorsPetroleum Cos.Power Cos.RailroadsAmbulancesHighway Depts.

Garages & WreckersTaxisFishing BoatsAgricultural PackersFarmersLoggersContractorsTrucking Cos.Geologists

REA UtilitiesForestry Depts.Mining Cos.BusesAirlinesConstruction Cos.Private AircraftAuto Clubs,

etc.

The frequencies now used in mobile radio, range allthe way from 1,610 kc to 460 mc, with concentrated bandsat 2.0 to 3.0 mc, 30 to 47 mc, 72 to 76 mc. 152 to 175 mc,and 450 to 460 mc. Besides the above frequencies, mostof the services have allocations in the microwave regionfrom 900 to 3,000 mc. However, at present there is verylittle activity in that part of the spectrum.

Each mobile -radio installation consists of a transmitterand a receiver; at the base station the transmitter usuallyoperates from ac power, and is rated at 30 to 250 watts;the mobile transmitter averages 5 to 30 watts and runson a 6 -volt or 12 -volt storage battery. The receivers aretuned for a single -frequency, are single or double -con-version superheterodynes, use crystal -control on theconversion oscillators, have selectivity of 20 to 40 kc,sensitivity of 1 microvolt or less, and a squelch circuitto quiet the loudspeaker in the absence of a signal. Alladjustments, checks, and repairs on the transmitter whichare made during installation, servicing, or tests must bemade by, or under the direct supervision of a licensedradio operator, either first or second-class, radiotele-phone or radiotelegraph grade. This is a commercialoperator's license, as distinguished from an amateurlicense. The license costs nothing, and is obtained bypassing an examination at one of the FCC offices.

This creates a wonderful opportunity for the wide-awake radio and TV technician. Each one of these mobileoutfits must be installed, then reinstalled each time thevehicle wears out or is replaced. Further, this equipmentworks best with "preventive maintenance," which meansperiodic inspection, alignment, and replacement of weakparts, before they blow. Finally, measurements of fre-


quency, modulation, and power input must be made atleast every 6 months.

Usually, a home -radio and TV technician is calledupon only when some trouble is found in a set. Mobile -service engineers, on the other hand, are continuouslyneeded since the equipment must be kept running, aroundthe clock, 365 days a year. Some engineers take full-time,salaried jobs with the big operators of vehicular fleets;others, and by far the majority, operate as independentsand contract to maintain a number of smaller radiosystems throughout their area.

In general, there are two classes of arrangements be-tween the service engineer and his client: (1) paymentfor service is made on a simple time -plus -material basis,as need for work arises; (2) payment for services ismade on a contract basis.

The most frequently reported arrangement is an annualcontract, between the engineer and a number of mobile -radio users, or licensees. The contract must tell whatwork is covered by the fee, or retainer. Usually it callsfor a periodic check, and correction as indicated, on eachradio unit, at intervals of 30, 60, or 90 days; it includesthe FCC maintenance checks, and usually the FCC paperwork on license applications, construction permits, andrenewals. It does not include installing, moving, or re-installing equipment; nor does it ordinarily include partswhich are furnished extra at regular retail prices.

Test Equipment

If you are already in the TV and radio repair business,chances are you already have the following: Tube Tester,RF Signal Generator, VTVM, VOM, Signal Tracer, Bat-tery Eliminator (both 6 and 12 volt).

In addition, for two-way radio maintenance work youwill need:

1. Dummy RF load-with this you can operate thetransmitter at normal input and output without trans-mitting a signal beyond your shop. (The FCC requiresthat mobile units be measured under load conditionsequivalent to actual operating conditions.) You canmake this dummy load, or you can find several mod-erately priced ones (sometimes called "dummy an-tennas") at most radio -parts distributors.

2. Grid -dip meter-very handy for checking the res-onant frequency of tuned circuits without applyingpower to the equipment. Also convenient for determiningthe approximate output frequency of the various multi-plier and amplifier stages in transmitters, and for check-ing conversion oscillators in receivers.

3. FM modulation meter-this must measure FM de-viation, plus or minus, from center frequency of thetransmitter. FM transmitters in these services operateon frequencies from 25 to 500 mc. Since the FCC regu-lations say the maximum modulation deviation shall notexceed a certain limit, the meter should respond to actualvoice peaks, not just to average or sine -wave modulation.

4. Frequency meter-this instrument must showwhether or not a transmitter frequency is within thetolerance specified by the station license. As noted above,you can have occasion to measure frequencies from aslow as 290 kc up to 460 mc.

5. AM modulation meter-actually, you may not needthis piece of equipment, as the vast majority of trans-mitters in these services use frequency modulation. How-ever, marine, aircraft, and some police transmitters below30 mc do use amplitude modulation.

The two-way radio industry is rapidly growing, anda number of alert and ambitious radio technicians willsee their buiness grow with it. Will you be one of them?-Lampkin Laboratories, Inc., Bradenton, Fla..

righterrter

profiticture

Rely on the tube that has always been afavorite with leading independent servicedealers.

(Am 6462114TONG-SOL®

RECEIVING TUBESTUNG-SOL makes All -Glass Sealed Beam Lamps, Miniature Lamps,Signal Flashers, Picture Tubes, Radio, TV and Special PurposeElectron Tubes and Semiconductor Products.


FOR BLANKET COVERAGE

replacement tv transformersof exact

every time!it's STANCOR

This table of STANCOR'S ex-act replacement flyback cover-age is based on an actual countof the models listed in the latestSTANCOR TV ReplacementGuide. Only exact replacementflybacks are listed. These per-centages do not include fly -backs that require chassis orcircuit alteration. Actually,true coverage is even higherthan these figures indicate sinceSTANCOR covers all of themost heavily produced models.

Manufacturer Stancor EXACTRepl. Flybaeks CO VERA GE

Admiral 9 83%Airline 11 81%General Electric 14 95%

Olympic 4 83%Philco 12 90%RCA 11 91%Silvertone 11 74%Zenith 14 97%

Write now foryour free copy ofthe latest TVTransformer Re-placement Guide,listing over 17,000TV models andchassis.

CHICAGO STANDARD TRANSFORMER CORPORATION3513 ADDISON STREET CHICAGO 18, ILLINOIS

YOUR BEST BUY!

"W" SERIES3 PURPOSE 5-10-15 WATTS

RESISTORSYour jobber has themor can get them for you.

MILWAUKEE RESISTOR CO.700 W Virginia Street Milwaukee 4, Wis.

Atomic Radiation


mr/yr. from color sets. This amountis still very low, and apparentlysafe. Remember, 15,000 mr/yr. is therecommended total limit. However,when added to radiation normallyreceived from other sources, TVX-rays add one more tiny straw tothe proverbial camel's back.

ConclusionPeople who have been exposed to

excessive radiation doses often donot suffer immediate effects, so theyare mistakenly led to believe thatthey have not been injured. How-ever, radiation effects show up manyyears later. Atomic radiation is nota triflng matter.

Fortunately, most of us do nothandle radioactive chemicals, andnormal contact with backgroundradiation is safe. To safeguardagainst harmful long-term effects toourselves and our descendants, itappears desirable to limit medicalfluoroscopes and X-ray photos tothose that are necessary. Newerequipment in competent, properlytrained hands is your best protec-tion.

TV sets give off X-rays, but theseare of such low intensity as not topresent a hazard. Nevertheless, sincenothing is gained by even this mini-mal exposure, it is suggested thattechicians do not keep more picturetubes than necessary operating everyday in very close proximity to theirbodies.

By understanding both the posi-tive and negative potentials ofatomic radiation, and acting accord-ingly, we can face the Electronic-Atomic Age without fear or anxiety.

"I think I have the trouble localized."

116 ELECTRONIC 1ECHNICIAN September, 1958

(Audio NewsletterContinued from page 111)

ARGOS PRODUCTS has an-nounced the TSE-1 8" speakerenclosure @ $16.50.

EUGENE R. KUN has intro-duced a new dc motor, bat-tery -operated, for portablephonos and tape recorders.Features low noise, lowbreakaway torque.

"HI-FI PLAYED HERE" is

promoted by Japanese res-taurants, similar to how weused to merchandise air con-ditioning, reports JackGilbert.

ROBINS INDUSTRIES has in-troduced the TK4-STD acces-sories kit for tape record-ers @ $12. It containssplicer, tape, threader,cleaner, clips, labels andbooklet for editing andmaintenance.

KINGDOM PRODUCTS has in-troduced the 4 -lb. "Fi-Cord" transistorized taperecorder. Speeds are 1-7/8and 7 1/2 ips, response 50 to12,000 cps within 3 db. Bat-teries are rechargeable.Size 9-5/8" x 5 x 2-5/8".

HAVE TROUBLE SLEEPING?GARDNER ELECTRONICS has an-nounced the Sleepatron, a 7 -transistor sleep inducerreproducing the sound offalling rain. "No more needto take harmful and danger-ous sleeping pills anddrugs. Restful sleep cannow be obtained electroni-cally," says the manufac-turer. "$125 for a lifetimeof sound sleep."

CENTER

"This one sells by the yard."

JERROLDannounces The First

ANPLIRED

,t4 .

""``111 ---ILINAholl

Plug -In TV -FM HOME SYSTEM8R11.1,14NT7V-

FLAWLESSIN EVERY

ROOMOF YOUR

NOW

siouforto

6044.

MODELHSK-300

LIST

Now in Complete, Easy -To -Install Kit!Now the world's first fully amplified home systemcomes in a lightweight kit that's a handsomeselling tool with everything you need to bringhi fidelity TV and FM reception to every roomof a home !

Each kit contains a broadband VHF (TV & FM)amplifier, sufficient 300 ohm Twin -Lead, and 5outlets for surface or flush mounting, creating acomplete system for any new or existing home.

No Trimming of WireNecessary .. . NoSoldering! Quick Screw-driver Installation !

HOME SYSTEM COMPONENTS AVAILABLE SEPARATELY. FOR COMPLETE DETAILS

SEE YOUR JERROLD DISTRIBUTOR OR

WRITE DEPT. PD75

ELECTRONICS CORPORATIONThe Jerrold Building, Philadelphia 32, Pa.

Jerrold Electronics Corp., Ltd., Toronto, CanadaExport Representatives, CBS International, New York 22, N.Y.

LOOK TO JERROLD FOR AIDS TO BETTER TELEVIEWING


Hallmark CONSOLENewest in the line of stereophonic

record sound systems is the 2 -speaker,dual -amplifier President, model 715Custom Console. The central controlunit features a 4 -speed stereo recordplayer and dual push-pull amplifierwith separate bass, treble and volumecontrols for each speaker. The speakersare easily positioned in the home to en-sure true stereophonic sound reception.Paramount Enterprises, Inc., 303 Con-cord Ave., New York 54, N. Y. (ELEC-TRONIC TECHNICIAN 9-37)

RCA DRIFT TRANSISTORSThe 2N373 and 2N374 are drift tran-

sistors of the germanium p -n -p alloytype specifically designed for use in en-tertainment -type battery -operated AMreceivers. The 2N373 and 2N374 featurevery low feedback capacitance, stabilityand uniformity of characteristics. The2N273 is intended primarily for 455 kci-f amplifier applications. Its low feed-back capacitance makes possible a use-ful power gain of 34 db without a neu-tralizing network. In circuits wheremaximum power gain is required and

No. 4 of a series of questions for progressive technicians.

Can You Handle This Problem?

A

At what speed do the electronstravel from A to D in this circuit?

1. Very slowly, not more than a fewinches per minute.

2. At the speed of light (186,000 milesper second).

3. At a speed authorized by the FederalCommunications Commission.

4. At a speed slightly slower than thatof the speed of light.

5. At varying speeds between 10,000 and80,000 miles per second.

(Answer Printed Below)The answer to this one may seem obvi-ous. Probably you know your principleswell enough to handle this one easilyenough. But ask yourself honestly, doyou know enough fundamental elec-tronic theory really to capitalize on theopportunities that are waiting for youright now?Letters and reports regularly receivedfrom technicians like yourself continu-

Cleveland Institute of Radio Electronics4900 Euclid Avenue, Dept. T-13, Cleveland 3, Ohio

ally stress two factors, which are thedirect results of training in fundamen-tals:

(1) Increased income potential(2) More interesting work

Replacing tubes and burned -out re-sistors in television sets can get veryboring. The challenge of new electronicdevices in the home as well as in indus-try is a welcome and profitable changeof pace.The answer to our little problem isgiven below. If you want a completesolution, just fill out the coupon andmail to us.

Answer to Problem Above:ainup.0 Jed

sayaul mei o uoty wow JOU 'AIMOIS LIMA IL)

Please send me detailed solution to problem above andinformation on how I may prepare for the increasingopportunities in electronics. There is no obligation.

NAME

ADDRESS

CITY ZONE STATET-13Accredited by The National Home Study Council

a neturalizing network is used, the2N373 can provide a useful power gainof 39 db. The 2N374 is like the 2N373but its characteristics are controlled tomeet the requirements of converter andmixer -oscillator applications in the AMbroadcast band. The 2N374 provides auseful conversion power gain of 40 dbat the center of this band. Radio Corp.of America, Semiconductor Div., Somer-ville, N. J. (ELECTRONIC TECHNI-CIAN 9-24)

Motorola "T -POWER"RADIOPHONE

A new mobile 2 -way radiophone op-erating in the 450-470 mc frequencyband features a transistorized powersupply and an advanced unified chassisdesign. The new unit provides greaterreliability and operational benefits. Theunified chassis design, which combinestransmitter, receiver and power supplyportions on one chassis rather thanthree, plus many other design features,

such as new type final amplifier tubesand a single crystal oven, aid overallequipment reliability. It weighs 34pounds, compared to 74 in former 450-470 mc mobile radiophones. It is pack-aged in a 30% narrower 10 inch hous-ing, enabling both under -dash andtrunk mounting. It provides 18 -wattstransmitter power output and a newhigh of 3 -watts receiver output. Motor-ola Communications & Electronics, Inc.,4501 W. Augusta Blvd., Chicago 51, Ill.(ELECTRONIC TECHNICIAN 9-38)

GE POWER TRANSISTORSLine of 30 -volt, one-half ampere PNP

germanium transistors for use in in-dustrial equipment have been designedfor medium power amplifier and lowfrequency, high current switching ap-plications. The four models, designa-tions 2N524, 2N525, 2N526, and 2N527,have a triangular lead arrangementand are housed in the JETEC TO -5package. The 2N525 and 2N524 are theelectrical equivalents of the 2N43 and2N44 transistors, respectively. 4000 -hourlife test data for typical units showthat beta varies less than 10% and Ico changes less than 20% at a 100° C.storage temperature. Typical alpha cut-off frequency is 2.0, 2.5, 3.0 and 3.3 mc,respectively. General Electric Co., Semi-conductor Products Dept., Syracuse,N. Y. (ELECTRONIC TECHNICIAN9-35)


Association News

CaliforniaRTA Magazine, spokesman for

Radio TV Association of SantaClara Valley, reports that Pres.Richard J. Kelso has appointed afact finding committee to study thesponsorship of an apprenticeshiptraining program. It would providefor 40 hours of on-the-job trainingplus school time. This programwould steer more technicians to-ward independent servicing, ratherthan manufacturer employment.

FloridaRadio -TV Technicians Guild

News states that over 450 servicedealers and technicians paid $2 eachin registration fees during the four -day exhibition and lecture series atthe first annual Southeastern Elec-tronic Service Convention (SESCO)in Miami. Speakers included Com-missioner Robert T. Bartley, FCC;Frank Moch, NATESA; Bob Mid-dleton, RETS; Bud Cook, RCA;Bill Ashby, Cornell-Dubilier; TomBlackwell, Sylvania; George Cross-land, GE; and Bob Andrews, Tung -Sol.

IllinoisIn a policy statement on radio -TV

service by manufacturers, NATESAannounced from Chicago; "We be-lieve no justification exists for thisunwarranted encroachment. . . . Noproof exists that fully qualified serv-ice on an ethical basis is not avail-able in every city and hamlet. . . .

We are prepared to arrange forhighly qualified professional serviceat rates compatible with the area,for any manufacturer who is notnow getting such service."

IndianaThe Hoosier Test Probe, official

organ of the Indianapolis TelevisionTechnicians Association, reflects therising opposition toward free servicewarranties by set makers. "Take the90 -day free service deal. . . . Togive this free service, a certain sumis buried in the list price of the set.Does the customer know that he ispaying for this free service? No! Hethinks he is getting service fornothing, and next to nothing is whathe will be willing to pay to an in-dependent service dealer later on."

MichiganTSA News, voice of

Service Associationthe Televisionof Michigan,

editorializes: "It is the right of anymanufacturer to price his sets withor without service, 90 days or oneyear on parts. However, we servicepeople do object to calling it freeservice . . . also object to offeringthe service to the service industryat such a ridiculously low figurethat it is impossible to break even."

MissouriThe Midwest Electronic Alliance

was formed at a July 19-20 meetingin Toledo, and is incorporated inMissouri. It is the result of efforts

by officers and members of ETAT,Toledo; ITTA and IESA, Indiana;ARTS, Illinois; and TEAM, Mis-souri. Officers are Verne La Plante,president; Robert Sickles, VP; How-ard Wolfson, Secretary -Treasurer.Inquiries about the service associa-tion alliance may be directed to thesecretary at 433 S. Wabash Ave.,Chicago 5, Ill.

OhioARTSD News, voice of the Asso-

ciated Radio -Television ServiceDealers in Columbus, reports prog-

The Capacitor Package that means Quality

1 year service guarantee

When you see this package inthe familiar red and black box,you know it contains "trouble -free" Planet capacitors-me-chanically and electrically testedthroughout manufacture. This

rigid system of quality controlmakes our unconditional one-year guarantee possible. Butmaking Planet capacitors cor-rectly from the start meansreasonable prices too!

PLANET SALES CORPORATION

225 BELLEVILLE AVENUE

BLOOMFIELD, N. J.

Write for Catalog listing specifications on stock items.


increase your know-how. . . increase your income

RIDER BOOKS AND MANUALS

BASIC PULSES by Irving Gottlieb, P.E. Pulses di-rect the high speed operation of all types of com-puters; underlie the functioning of radar systemsfor early warning, recognition, fire control-ingeneral the gathering of information from distantpoints by electromagnetic radiation means. Pulsesguide industrial operations that require split-second timing for mass production-counting,sorting and testing. Virtually every form of elec-tronic timing involves the use of pulses. Thefunctioning of every television system-over theair, or closed circuit-depends on correct pulsefrequencies, duration and shape; in fact the appli-cation of pulses recognizes almost no boundariesin the field of electronics. You can learn all aboutpulses and expand your opportunities in thesefields, quickly and easily with this one volume"picture -book" training course. BASIC PULSESis a thorough, crystal-clear presentation of thenature, measurements and application of pulses-what they are and how they are used. The bookcovers these major areas: what is a pulse; meas-urement of pulses; composition of pulses; energystorage viewpoint of pulses; waveshaping tech-niques; and describes and analyzes all known pulsegenerators including tube and transistorized types.Every equation is made understandable by nu-merical examples. A glossary of pulse terms is pro-vided. Number 216, soft cover. 176 pages $3.50.

PORTABLE AND CLOCK RADIOS, by Ben Cruisesand David Gncssin. You can learn all about port-able and clock radios-their circuitry, their repair,in this modern book. Beginning with typical port-able radio circuits, emphasis is placed on filamentcircuitry and how major problems of current dis-persion are handled. Transistor circuitry is cov-ered. Stress is placed on portable radio powersupplies for battery circuits and battery and AC -DC circuits. Numerous battery testing techniquesexplained. Covers repair, replacement and align-ment plus a detailed discussion of probablemechanical troubles, replacement procedures andshort-cuts. Tips on extending the life of the setare discussed. Clock radios, their circuitry, a widevariety of clock movements, how to adjust themand locate defects also covered. Tips on cleaningand lubricating clock mechanisms. #224. $2.75.

HOME AIR CONDITIONING-Installation IL Repairby J. Derman, F. Makstein, H. Seaman. Thismodern, completely practical text by three expertsin the field of home air conditioning, enables any-one to understand the organization, operation,installation and repair of all types of home airconditioners.Both electrical and mechanical components arefully identified, described and illustrated, permit-ting instant recognition of the parts. Function ofeach part, its contribution to the entire unit isexplained in detail. Troubleshooting and repairtechniques are completely covered plus informa-tion on how to pinpoint specific troubles by theirsymptoms. Typical window & package installationsand smaller commercial installations are discussed.Tells how to select the proper unit. Excellent forall who seek entry into the lucrative air condi-tioning field. #211, $3.50

IV PICTURE TUBE -CHASSIS GUIDE, by Rider LabStaff. This easy -to -use TV tube type chassis guidecovers all picture tube types used in TV receiverproduction from 1946 to February 1957-over 7.000listings. Organized by chassis number, and in somecases, by models so that the technician can imme-diately locate the correct picture tube type simplyby knowing the chassis number, #204, Only $1.35.

NOW AVAILABLE

TV 23Finest TV Service

Information Anywhereonly $21 00

Rider Books are sold by parts dis-tributors and bookstores. Look forthe familiar Rider Bookseller. Itcarries a wealth of electronicknow-how in the many titlescovering every phase of radio,TV, audio and electronics. There'sa Rider Book that will make serv-icing more profitable, increaseyour income. If these books arenot available, order direct: ET -9

JOHN F. RIDER PUBLISHER, INC.

116 West 14th Street. New York l I, N. Y.

ress on -their draft of a licensingordinance being prepared for sub-mission to city officials. Seven partsjobbers were visited, and all ex-pressed support of the proposedlegislation.

PennsylvaniaIn a campaign against captive

service, TSA News reports that theTelevision Service Association ofDelaware Valley and other groupsin Pennsylvania, Delaware and NewJersey adopted the following reso-lution: "Whereas many of the TV,radio and hi-fi set manufacturershave instituted a policy of one yearwarranty on parts and receivingtubes; Be it resolved that the Tele-vision Service Association of Dela-ware Valley will not be obligatedto honor any manufacturers war-ranty after the standard 90 day pe-riod."

The dedication of Settle Hall inPhiladelphia, by the Delaware Val-ley Electronic Service Industry, wasan inspiring occasion for every one.At the conclusion of the dedicationaddress by R. H. Cherrill, presidentof TSA of Delaware Valley, a newSettle Hall plaque and portrait ofCharles Settle was unveiled by Mrs.Settle. In a brief address, Mrs. Settlepaid tribute to the industry forcarrying on the work to which Char-lie Settle had devoted most of hislife. In the presence of Richard Bar-nett, of Barnett Bros.; Al Green, ofAlmo Radio Co.; Henry Lapinski, ofHot Point Appliance Co.; Al Stein-berg, of Albert M. Steinberg & Co.,and Frank Schuslag, of Allied Elec-tric Parts Co., representing Philadel-phia and Delaware Valley headquar-ters; Harry Fallon, of Radio ElectricService Co., addressed the gatheringand paid tribute to Charlie.

TexasThe Texas Electronic Association

held its 6th Annual Clinic and Fairat the Statler-Hilton Hotel in Dal-las, Texas, August 1, 2, and 3, andfeatured Morris L. Finneburgh, Sr.,V.P. of The Finney Company, astheir keynote banquet speaker. Inhis return engagement, Finneburghspoke on "The Future Belongs toThose Who Prepare For It-SecondEdition." He is nationally known asa dramatic and forceful speaker inthe vital field of sales promotion,customer relations and psychology.He is a native born Texan. Estimatedattendance was 1,500 dealers fromTexas, Oklahoma, New Mexico, Ar-kansas and Louisiana.

Mi717676NIN,SENCORE

TRC4

TRANSISTORCHECKER

FOnly

tester

th

that

chekscaradio

power transistors

:NOWCHEKS:*Transistois

I leakage and cur rent gain. In-' cludes newIgain test onpower, transistors.

I * Crystal Diodeschecks forward to reverse

tcurrent ratio on all'diodes.. * Selenium Rectifiers 'I checks forward and re-' verse currents.

IControls ore accurately set for each transistor' by referring to replaceable set-up chart on rear. I

ITest leads or socket provides for fast hook-up.'

v:{ SiMptEOPERATE

I

See your pdrts distributor.

elar.illAri 'V SERVICEINSTRUMENTS CORP. I

171 OFFICIAL RD., ADDISON, ILLCut out this ad now for further information

ask the"Man -on -the -Roof''why he prefers

c6Feevi&

S N - SOCHIMNEY MOUNT

SNAP -IN TYPEWith unique U -Bolt INSTEADOF SCREWS for easy one hand"Spintite" fastening. Hot DipGalvanized - 12 Ft. Straps.two to a set. Same UniqueU -Bolts used on Snap -in WallBrackets. Also Available withStainless Steel Banding.

Write for new Catalog

SOUTH RIVERMETAL PRODUCTS CO., INC.

South River, New Jersey

pioneer &outstanding 4.producer offinest lineof antennamounts


Gonset 2 -WAY RADIONew 2 -way mobile radio features "S"

strip construction. The series featuresthree parallel "strip" chassis which areheld securely and protected by a strongouter housing. All of the several typesof transmitters, receivers and powersupplies are individually mounted onthe same size and type of strip chassis.Units may therefore be changed readilyto facilitate re -arrangement, checking

or leplacument. TiansinittAA:, arc avail-able in three power ranges, 30, 60 and100 watts in frequency ranges of Z5-54mc and 152-174 mc. Receiver strips canbe supplied with "Super -G" band-passfilters for broad, medium, or narrow -band selectivity. Split -Channel opera-tion can be accomplished readily. Link-by-Gonset Div., Young Spring & WireCorp., 801 S. Main St., Burbank, Calif.(ELECTRONIC TECHNICIAN 9-39)

JFD L -C TUNERS

The new tuners combine a variableinductance and a capacitor in a singleversatile unit. The inductor winding,which also acts as the capacitor plates,is metallized on a highly stable glasscylinder. Movement of a piston in thecylinder changes both the inductanceand the capacitance. The nature of re-sulting change in the resonant fre-

quency is determined by the design ofthe unit and the manner in which it isused. Characteristics are: capacitance

'range, 1-17pf; self resonating frequencyrange, 450 to 1,000 mc; loaded tunerswill resonate from 80 to 300 mc accord-ing to type of load. Characteristicsgiven can be varied. JFD ElectronicsCorp., 6101 6th Ave., Brooklyn 4, N. Y.(ELECTRONIC TECHNICIAN 9-40)

Monitoradio RECEIVERSTwo new receivers are reported to be

the only tunable mobile receivers op-erating in the 30-50 mc and 152-174 mcemergency communication bands, modelM-40 is for the 30-50 mc band andmodel M-160 is for the 152-174 mc band.Both sets feature double conversiontuned r -f stages, 2µv sensitivity, andbuilt in squelch adjustable from thefront panel. Monitoradio Div., I.D.E.A.Inc., 7900 Pendleton Pike, Indianapolis26, Ind. (ELECTRONIC TECHNICIAN9-41

GREGG

REPLACE

PRINTED

CIRCUIT

COMPONENTS

IN A FLASH

Gregg's Solder Tip Kit* isa must for printed circuitrepairs! It is invaluable tounsolder several terminalssimultaneously, removingcomponents safely andquickly. Kit has four inter-changeable tips for tubesockets, IF transformers,

SOLDERING

GUNS

electrolytic condensers andtwo sizes for condenserresistor boards. Each tipcontains its own heatingelement which distributesthe proper heat over itsentire surface. Pays for it-self on the first job!

"GREGG ,

MODEL 250A

AMERICA'S FINEST GUN Two second heating - no waiting. Heat

is generated right at the soldering point. Permanent alloy tip does away with

filing and cleaning - just a wipe andit's ready. Outlasts copper tips 5 to 1.

Single barrel construction - reachesinto deep places without damage towiring or components. Rigid tip makesit easy to remove wires and clean ter-minals while hot. Other barrels avail-able in 6", 8", 10" and 12" lengths.

WRITE FOR FREE

BOOKLET ON REPAIRINGGREGG electric sales, co.

PRINTED CIRCUITS 620 essex st., lawrence, mass.Pat. Appl'd for.


SIMPLIFY TEST and

TROUBLE -SHOOTING

PROCEDURESwith

INGSTOKTEST EQUIPMENT

Models EA -1 and VS -5II47*" Kingston Absorption

Analyzers provide elec-trostatic signal tracingand extreme sensitivity.For trouble -shooting anyequipment with wave..

\ ,---, forms. CRT displays0 - %......... wave -form from each

stage.

-..,..0,-- - Model P0-1 KingstonAbsorption Analyzer al-lows conventional oscil-loscopes to be used in

k itz trouble -shooting electro-t statically. Built-in speak -CZ: er for use as an audio

analyzer.

Accessory Probes forminiature, sub -miniatureand shielded tubes. AlsoDirect Probe for usewith VS -5 and EA -I.Transistor Radio Probesimplifies trouble-shooting of transistor-ized radios.

Model BB -1 VariableDC Source, battery -driven for use wherevera pure DC voltage isdesired. Voltage can bevaried and metered.

Probe -Master. Built-incapacitive network al-lows by-passing ofstages, coupling of sig-nals from one stage toanother. Most versatiletesting probe on themarket. Complete withtwo clips and neon bulb.

WRITE TODAY FOR CATALOG

Ind$T0110%ELECTRONIC CORPORATION

MEDFIELD, MASSACHUSETTS, U. S. A.

Standards For

Stereophonic

Disc

Records The following are the findings ofthe Engineering Committee with re-spect to stereophonic disc phono-graph records, which were acceptedby the Board of Directors and ap-proved as RIAA standards on March25, 1958:

1. In stereophonic disc phonographrecords, the two channels shallbe orthogonal modulations of asingle groove.

2. In the 45 °-45 ° system of stereo-phonic disc phonograph record-ing, the two axes of displace-ment modulation are inclined45° to the disc surface.

3. In 45°-45° stereophonic discphonograph records, the right-hand information as viewed bythe listener, shall appear asmodulation of the outer side -wall of the groove.

4. In 45°-45° stereophonic discphonograph records, equal in -phase signals in the two chan-nels shall result in lateralmodulation of the groove.

5. Lateral modulation of the ste-reophonic disc record shall pro-duce equal in -phase acousticalsignals at the loudspeakers.

6. The 45°-45° system is recom-mended as a standard for stere-ophonic disc phonograph rec-ords.

It is further recommended that:1. The desirable tip radius for

reproducing stereophonic discphonograph records be 0.5 mils.

2. The included angle of thegroove be 90°.

3. The bottom radius of thegroove of the finished recordbe 0.2 mils maximum.

The Board also approved forstereophonic disc records the samerecording and reproducing charac-teristics and the same dimensionalstandards as have previously beenadopted for 45 rpm and 331/, rpmrecords as outlined in RIAA Bul-letins El and E2.-Record IndustryAssociation of America, Inc.

Eliminate call backs...use dependable,

industry -preferred...

1

QUALITYComponents

3 WATT SIZE9A6" x 'A"

S WATT SIZE1146' x

AXIAL -LEAD RESISTORS

Vitreous -enameled, power -type,axial -lead units designed to withstandhigh temperatures.

LITTLE DEVIL®'4111iiiiligg)COMPOSITION RESISTORS

Meet all MIL -R -11A requirements.Available in 1/2, 1, and 2 -watt sizes inall standard RETMA values.

BROWN DEVILSRESISTORS

Vitreous -enameled.In 5. 10, and 20- watt sizes.

OM% MOID

TYPE ABPOTENTIOMETERS\. Resistance material

is solid -molded, noise -free.Rated at 2 watts.

FR -7.5 FUSERESISTOR

For easyreplacement in

many televisionreceivers.

11/2" Tinnedwire leads.

WRITE FOR STOCK CATALOG

OHMDEPENDABLE RESTS

OHMITE MANUFACTURING COMPANY3687 Howard St. Skokie, Illinois


New ProductsFor more information, write in ELECTRONIC TECHNI-CIAN'S new product code number on coupon on page 39.

Affiliated SELF-SERVICE TESTER"Atlas," a new self-service tube

tester, features guaranteed non -obsoles-cence. Built into the Atlas is a memorybank. Leads from 40 sockets are con-nected to the bank by a unique systemof plugs and conectors. For a new tubeseries, the Atlas owner will receive asimple diagram instructing him on

whatever new connections are to bemade. The entire procedure can be donein minutes, without soldering or tools.Cabinet will store more than 600 tubes.Tube chart lists 370 of the most populartube types. $129.95. Affiliated TelevisionLabs., Inc., 112-07 Francis Lewis Blvd.,Queens Village, N. Y. (ELECTRONICTECHNICIAN 9-18)

Hickok PORTABLE TESTERTraceometer for testing transistorized

portable and automobile radios includesan easy to learn course in transistorradio servicing. It is actually three in-struments in one: tuned receiver, 200kc to 575 kc for i-f stages, and 550 kcto 160 kc for r -f stages. Audio amplifierand 400 cps output. AM signal genera -

4

tor covers same ranges. Transistortester checks leakage and gain. Loud-speaker is an indicator for signal trac-ing. This Model 810 in portable steelcase. 105-125 v. ac. Hickok ElectricalInstrument Co., 10523 Dupont Ave.,Cleveland 8, Ohio. (ELECTRONICTECHNICIAN 9-10)

Paco WIDEBAND SCOPEModel S-55 5" wideband, dc oscillo-

scope kit is suited for industrial testing,radio and TV service and high fidelity.Vertical channel sensitivity, dc 70 my,in., ac 25 my rms/in.; frequency re-sponse, dc 3 db to 4.5 mc, ac 3 db 1 cpsto 4.5 mc; rise time, better than 0.08 msec.; input 1.5 meg. Horizontal channel

sensitivity, 0.6 v. rms/in.; frequency re-sponse, 3 db from 1 cps to 400 kc. 5 meginput. Linear time base frequencyrange, 10 cps to 100 kc sawtooth; sync,automatic "positive" and "negative" in-ternal, 60 cps. $87.50. Wired probe AS -1,$14.95. PACO Electronic Co., Inc., 70-3184th St., Glendale 27, New York,(ELECTRONIC TECHNICIAN 9-14)

Philco SIGNAL GENERATORAM r -f Generator, Model 7200, with

frequency range of 100 kc-280 mc, fa-cilitates alignment work on all chan-nels. The generator can also be used asa marker at r -f frequencies in TV re-ceivers. Features include high uniformoutput, stable operation and lightweight. It has large vernier scale per-

mitting an accurate adjustment to allfrequencies, high r -f output makingpossible extreme accuracy in checkingsingle stages, and uniform modulationfor checking gain and distortion. PhilcoAccessory Div., "C" and WestmorelandSt., Philadelphia 34, Pa. (ELECTRONICTECHNICIAN 9-13)

Oat44-e". tape recorder P. A. system portable TV set hand tools

FROM YOUR CAR, Boat or Plane!

with

INVERTERSFOR CHANGING YOUR STORAGE

BATTERY CURRENT TO

A.C. HOUSEHOLDELECTRICITY ,

ANYWHERE...in your own CAR

Boat or Plane?

OPERATESPORTABLE TV SETdirectly from your toff

OPERATES TAPE RECORDERS DICTATING

MACHINES PUBLIC ADDRESS

SYSTEMS ELECTRIC SHAVERS

directly from your car!

MAKE YOUR CAR, BOAT OR PLANEA ROLLING OFFICE!"

1=:, OPERATES

fb

RADIOS RECORD PLAYERS MIXMASTERS, ETC.

directly from your cart

mounted out \of sight under \dash or in itrunkcompartment)

UNIVERSAL

INVERTERSEspecially designed to change 6 or 12 voltD.C. to 110 volt A.C. 60 cycles.for...

EXECUTIVES POLICEMEN SALESMEN REPORTERS OUTDOOR MEN FIREMEN

PUBLIC OFFICIALSMODELS 6U-RHG (6 volts) 125 to 150 watts. Shippingweight 27 lbs. List price $89.95

DEALER NET PRICE. $59.971211 -RHO (12 volts) 150 to 175 watts. Shipping weight27 lbs. List price $89.95

DEALER NET PRICE $59.97Write for literature on other Sizes and Modelsof ATR INVERTERS, priced as low as $9.95 list.

SEE YOUR JOBBER OR WRITE FACTORYVNEW MODELS 1/NEW DESIGNS ,/NEW LITERATURE

"A" Battery Eliminator; DC -AC Inverters Auto Radio Vibrator!

AMERICAN TELEVISION IL RADIO CO.

2esestit# Plat:egad Sugee 1931SAINT PAUL 1, MINNESOTA, U. S. A.


Heath TEST OSCILLATORModel TO -1 test oscillator kit pro-

vides test frequencies most often usedin the repair and alignment of superheterodyne broadcast receivers. 262 kc,455 kc, 465 kc, 600 kc and 1400 kc arequickly selected. Two crystal socketsare switch -selected for any frequencyyou may use. R -F output may be un-

modulated, 400 cps modulated, or audioused separately. Output level is ad-justed by continuously variable control.Construction is simplified through useof a pre -assembled and aligned fre-quency selector switch. $16.95. HeathCo., Benton Harbor, M'ch. (ELEC-TRONIC TECHNICIAN 9-15)

G -C SILICONE COMPOUNDA compound called "G -C Transistor

Z5 Silicone Compound" for use in serv-icing transistorized circuits is effectivein transferring heat away from tran-sistors, thus preventing burnouts. If theprotective grease is removed during re-placement of a transistor in a circuit,the resulting inefficient transference of

heat may cause the transistor to burnout. Z5 is applied between transistorsand chassis to dissipate that heat. Z5compound (G -C No. 8101) is availablein handy 1 oz. tubes for $2.25 list. Gen-eral Cement Mfg. Co., (div. Textron),400 S. Wyman St., Rockford, Ill.(ELECTRONIC TECHNICIAN 9-17)

Walsco "FREEZ-MIST"Defective circuit components of an

intermittent nature due to temperaturechange can now be located instantlywith the aid of Freez-Mist. The solu-tion, when sprayed on the circuit, coolsit instantly, thus pinpointing faulty ca-pacitors, resistors, transistors, coldsolder and oxidized junctions due to

temperature variances. It is a time-saver since it allows component checksin operation without removing themfroin the circuit. Packaged in a colorfulaerosol -type spray can, its list price is$3.25. Walsco Electronics Mfg. Co., 100W. Green St., Rockford, Ill. (ELEC-TRONIC TECHNICIAN 9-20)

theIDEAL LAMP

FOR THE

SERVICE BENCH

IN THE SHOP

OR INDUSTRY!

Luxo Lamps assure perfect lighting for assembly and inspec-tion and where exacting tolerances and quality control is of theutmost importance.

LIGHTWEIGHT, PORTABLE AND STURDY!Luxo Lamps direct all the light where you want it. With just

the touch of a finger, you can raise, lower, turn or tilt it to anyangle . . get just the desired focus, direction and intensityof light.

Comfortable to work under, too, because it eliminates reflec-tions and disturbing shadows . . . and provides glare -free il-lumination.

Inspect the Luxo Lamp at your jobber today or send for com-plete catalog showing all sizes and styles available.

U.L. & C.S.A. APPROVED.

LUXO LAMP CORPORATIONSAN FRANCISCO, CAL. TUCKAHOE, N.Y. MONTREAL, QUEBEC

D-6127 $49.95 Net

First to service all 3:1. Transistor and hybrid auto radios2. Transistor portable radios3. Tube auto radiosImproved D-6127 ... better than ever - same low price Dual range - 0-8 volts, 0-16 volts, continuously

variable Up to 221/2 volts available for transistor portable

radio loads 1/10% AC ripple for low current loads- 1/2%

AC ripple up to 5 amperes 10 amperes continuous duty up to 12 volts 20 amperes intermittent service

Send for New Bulletinsgiving data and applications

ELECTRO PRODUCTSLABORATORIES

4501-T Ravenswood, Chicago 40,Canada: Atlas Radio Ltd., Toronto


Made especially for the

RADIO AND ELECTRONIC MARKET

Guarantees your work -FASTER! SURER! NO CALL-BACKS!

LOWEST POSSIBLE PRICES -

PROMPT DELIVERY

SOLD ONLY THROUGH

RADIO PARTS DISTRIBUTORS!

D.,osc sto Dept. MM 558

MULTICORE SALES CORPORATION

"to PORT WASHINGTON, NEW YORK

II

IIIII

I

III

INN IMO Mr WA*INT M "VNT

IMPROVEDSENCORELeakage Checker ILC3

41k

Check these outstand-

ing New FUMES

Now - For thefirst time ...Checks 144 differ-ent tube types -more than anyother "grid circuit" typechecker. Includes UHF and lat-est type tubes.Checks picture tubes without re-moving tube from cabinet orchassis.New Roll Chart prevents obso-lescence - just dial the tubetype and save time. Chart iseasily replaced at no extra cost.Dynamic Filamentchecks including heater to cath-ode leakage & shorts - no needfor a second filament tester.Two spare preheating sockets tocut down testing time.Capacitor checks simplified.

95

DEALER NET

Reale/204fut70494Deep

The LC3 provides all these new improved fea-tures in addition to those employed in earlierleakage or "grid circuit" testers. A must forany TV service technician.

SERVICEINSTRUMENTS CORP.171 Official Rd Addison, Ill.

IIII

I

II

In stockat your

local partsdistributor

Cut out this ad now for further information MIL

B&K PIX-SOUND GENERATORModel 1150 automatic picture and

sound generator makes it easy to op-erate your own closed-circuit TV sys-tem. It transmits pictures from yourown 35mm (2x2) slides, with simul-taneous sound to any number of TV re-ceivers. Uses any of five TV channels(2 to 6) for separate closed-circuit

telecasting or for interjection betweenregular TV station broadcast programs.Can be used as a fixed station or con-veniently transported. Also for com-munity TV or master antenna systemswith closed-circuit channel. $895. B&KMfg. Co., 3726 N. Southport Ave., Chi-cago 13, Ill. (ELECTRONIC TECH-NICIAN 9-16)

Centralab PEC KITA new kit of PEC packaged circuits,

known at the PCK-40 Kit, contains 40units divided among 14 of the most fre-quently use types. This carefully bal-anced inventory will cover 80% of PECpackaged circuit replacement needs.

Each unit is in an individual rigid plas-tic package, arranged for instant identi-fication is a sturdy metal cabinet. Thekit sells for $26.93 dealer net and thecabinet, valued at $4.75, is supplied free.Centralab, 900 East Keefe Ave., Mil-waukee 1, Wis. (ELECTRONIC TECH-NICIAN 9-12)

Ram FLYBACKSTwo replacement flyback transform-

ers are Model X163, which replacesWestinghouse & Airline numbers 493-V004M02, M04, M05, M06, 493V002H02,H04, H05, H06; and X164, which replaces493V004M01, M03, 493V004H01, H03.Ram Electronics Sales Co., Paramus,N. J. (ELECTRONIC TECHNICIAN9-32)

CHECKFIELD OFGREATESTINTEREST

Servicemen!Technicians!

READ THISFREE BOOK

It May Start YouToward More Pay in

RADIO -TVELECTRONICSThousands of men have sent for it.They read it-and now they are welladvanced toward their goal toward abetter job with more pay, plus thesecurity and confidence that comeswith it.Get the details yourself and see whatopportunities, through advanced CREItraining, await you. Mail coupontoday. You can qualify for CREItraining if you have had electroniceducation or experience in elec-tronics.

CAPITOL RADIO ENGINEERING INSTITUTE

ECPD - Accredited Technical InstituteCurricula - Founded 1927Dept. 329-E, 3224 16th St. N.W. Wash. 10, D. C.Please send me your course outline andFree Illustrated Booklet, "Your Future inthe New World of Electronics."

1-3 Radar, Servo and ComputerEngineering Technology

0 Electronic EngineeringTechnology

0 Broadcast (AM, FM, TV)Engineering Technology

0 Television EngineeringTechnology

0 Aeronautical ElectronicEngineering Technology

Name Age

Street

City State

Check: El Home Study 0 Residence School 0 Korean Vet

1

Rogers FLYBACK REPLACEMENTSTwo exact replacement flyback trans-

formers for CBS TV receivers are EFR202, an exact replacement for CBS12001251; and Model EFR 203, an exactreplacement for CBS 12001181. Theseunits are designed for exact connectionby connection replacement in CBSchassis 1621, 3001, 3002, 3003, 3012, 3013,and 3015. Complete with all necessaryparts for rapid installation, in sealedplastic bag. Rogers Electronic Corp.,43-49 Bleecker St., New York 12, N. Y.(ELECTRONIC TECHNICIAN 9-31)

Westinghouse RECEIVING TUBEA new 9 -pin miniature beam power

pentode designed for use as a verticaloutput deflection amplifier in 110° TVsets is now available. The 6/12DT5 hasa controlled plate current character-istic featuring high zero bias plate andscreen voltages of 250. Closely con-trolled for microphonism, the DT5 iscapable of sweeping a 24 -inch 110°cathode ray tube with ample reservepower. Westinghouse, Electronic TubeDiv., Elmira, N. Y. (ELECTRONICTECHNICIAN 9-28)

WRIGHT

WIRE STRANDPERFORMS LIKE A KINGAND IS NON -SNARLING

Wright TV Guy Wire Strandis your guard against irri-tating snarls. Each concen-tric coil measures two feet.

You save money in guy-ing antennas. Greaterflexibility, heavily galva-nized continuous con-nected coils. Prompt

delivery from stocks inWorcester, Chicago,

New Orleans,Dallas, Los An-geles, San Fran-cisco and Port -'and, Ore.

Non -Snarling Pre.Measured WireStrand Sold onlythrough WholesaleDistributors.

G. F. WRIGHT STEEL & WIRE CO.250 Stafford St. Worcester, Miss.

RADIO -TV SERVICEMEN - DEALERS

Here's a DEPENDABLESOURCE of SUPPLY for

RECEIVING TUBESNationally sold, consumer -ac-cepted ZALYTRON Tubes areQUALITY Tubes, priced Lowto help you meet compe.tion! Try them ONCE-you'llbuy them ALWAYS! You be

the judge your first order

and your 100th order shippedpromptly on full refund guar-antee! Write Today for New,

1 -YEAR GUARANTEEand C

Complete Catalog of Tubesomponents. Dept. ET

TUBE CORP.220 West 42nd St..New York 36, N. Y

BE INDEPENDENTRun Your Own TUBE Business

We'll help you start a successful"Do -ft -Yourself" Tube Tester Route.Get your shre of toda's ig Businessin Self-Servaice Tube SyalesB! This mod.em, Sturdy

FREE TUBE TESTERincluded with "Package Deal" orderfor Nationally Sold ZALYTRON QualityBrand Receiving Tubes. For full de-tails, write for Booklet "E"

TUBE CORPORATION220 West 42nd St., H. Y. 36, N. Y.

Ungar SOLDERING TIPSTiplet No. PL 338 brings needle -point

precision wherever subminiature sol-dering is required. For extremely fine,delicate soldering and close hard -to -reach locations, it provides the perfectanswer. It is also useful for cleaningeyelets on printed circuit boards. Heatrange 600° to 800°. Tiplet PL 833 is a 2"

straight chisel tip adaptable for extradeep chassis soldering. It has a Mediameter and is made for use with thenew 4045-47% watt heating unit. Ironclad to provide extra long life. UngarElectric Tools, Inc., 4101 Redwood Ave.,Los Angeles 66, Calif. (ELECTRONICTECHNICIAN 9-19)

Tung -Sol TRANSISTORNew power switch transistors include

Types 2N378, 2N379, 2N380, 2N459, ger-manium power transistors in new allcopper "cold well" package. Featuresare maximum thermal resistance of1.2°C/watt, increased gain and currentratings. New computer transistors in-clude Types 2N578, 2N579, 2N580, 2N581,2N582. Tung -Sol Electric Inc., 95 8thAve., Newark 4, N. J. (ELECTRONICTECHNICIAN 9-25)

Amperex FRAME GRID TUBESTwo new tubes for TV, 6ES8 and

6DJ8, incorporating frame grid con-struction make possible an increase ineffective TV signal reception area. Lownoise is the outstanding feature of thesetubes. Frame grid construction makesis possible to use extremely fine wirefor the grid and achieve the closest ap-proximation now practical to the physi-cists's "ideal" grid. This ideal is an in-finitely thin conducting plane whichoffers no resistance to the passage ofelectrons except that due to its electro-static potential. Unlike conventionalgrids in which the wire supports therods, frame grid wires have only anelectronic function, the mechanical be-ing fulfilled by a self-supporting frameconsisting of two molybdenum center -less ground rods connected by fourspot-welded molybdenum strips. Grid -to -cathode spacing can be reduced, re-sulting in an increase of the gain -bandwidth product, another factorincreasing the efficiency of frame gridstructure. Amperex Electronic Corp.,230 Duffy Ave., Hicksville, N. Y.(ELECTRONIC TECHNICIAN 9-23)

1 2 6 ELECTRONIC TECHNICIAN September, 1958

3 TESTERS IN 1* Tuned Receiver* AM Generator* Transistor Tester

Specifically designed with allnecessary features for completetroubleshooting of transistor radios.Almost all portables made today aretransistorized. With the 810 you canprofit immediately from service in thislarge, new field. The instruction bookincluded contains an easy -to -learncourse in transistor radio servicing.Now, any serviceman can quicklytroubleshoot and profitably repairtransistor radios.TUNED RECEIVER -200 to 500 KC for trouble-shooting IF. 550 to 1600 KC for troubleshootingRF. A cathode follower input probe minimizesloading. Loudspeaker indicator for signal tracing.AM SIGNAL GENERATOR -200 to 575 KC forIF alignment. 550 to 1600 KC for RF alignment.400 cycle audio output for signal injection.TRANSISTOR TESTER-Test circuit for checkingtransistors-leakage and gain.

The 810 will pay for itselfin a short time ... and giveyou many years of accurate,dependable service. '10990NET

Now is the time to...TRADE UP TO A HICKOK

Ask for a demonstration of the new 810from your Authorized Hickok Distributor.

THE HICKOK ELECTRICAL INSTRUMENT CO.10514 Dupont Ave. Cleveland 8, Ohio

Nielsen WIRE CUTTERA wire cutter based on new principles

is ideal for work in crowded electronicchassis. Called "Little Snipper," thecutter features a radial shearing action,implemented through a spring -loadedthumb lever. To use, simply hold LittleSnipper like a pistol; the thumb natural-ly falls on the lever intended for it.Wire to be cut is picked up in the cut-

ting jaw at the end of the barrel, andlight thumb pressure applied. The 10 to1 leverage makes it easy to cut copperwire up to No. 8, or stainless steel upto No. 20. May also be used as pincers.Available in 2 -inch, 4 -inch, and 6 -inch,E. V. Nielsen, Inc., 575 Hope St., Stam-ford, Conn. (ELECTRONIC TECHNI-CIAN 9-21)

Jerrold UHF CONVERTERSUltracon UHF converter Model TCU,

is designed for primary reception areas.Unit features continuous coaxial tuningover entire UHF band, preselectionstage, low -noise mixer, and slide -ruledial coupled to vernier tuning. $22.95.Model FTC is a deluxe UHF converterfor reception in poor signal areas. Itcombines high gain amplification withlow -loss circuitry, and has wiperlesscoax tuner. For local area reception,Model FTC contains a built-in UHFantenna. List is $39.95. Jerrold Elec-tronic Corp., 15 St. & Lehigh Ave., Phil-adelphia 32, Pa. (ELECTRONIC TECH-NICIAN 9-27)

Shure MICROPHONECommunications microphone "Ten -

Four" is tough enough to survive theweight of a load -bearing truck. It isencased in synthetic resin and weighsonly about half as much as the stand-ard, die-cast metal microphone. It willnot chip or crack in normal use andis impervious to grease, acids and saltspray. Ten -Four means "message re-ceived" in the official communicationscode of the Associated Police Commu-nication Officers. Heart of the Ten -Fouris the controlled magnetic cartridge.Complete microphone, including plugand cable, weighs only 8 oz. Shock haz-ard is eliminated. Low thermal conduc-tivity allows the Ten -Four to feel com-fortable, even in extreme hot or coldweather. Shure Brothers, Inc., 222 Hart-rey Ave., Evanston, Ill. (ELECTRONICTECHNICIAN 9-30)

Partners Ray Kirlihart andJoe Kopin of Picture Tube Center,

154L North Western Avenue,Hollywood 27, California.

"We Operate 38 Sets

from One Antenna

without Amplification""Good reception is the most impor-tant factor in selling a TV set, andno matter how good a set is, a poorantenna system can make it lookbad. We started with individual an-tennas . .. later we put in two distri-bution amplifiers and operated six-teen sets from one antenna. Today,with Wizards, we are operatingThirty -Eight sets from one antennawith No Amplification and have thefinest reception we've ever seen.

for: UHF and VHFThe new Electro-Magnetic setcoupler for 300 ohm flat line thatis not limited to 2. 3 or 4 sets

High Signal ResponseLow Insertion LossImpedance AutomaticallyMatchedInstallation Fast & SimpleList Price $1.95For additional information write:

CHARLES ENGINEERING, INC.6053 Melrose, Los Angeles, California


"36MostOftenNeeded

ComponentsAt YOUR

Fingertips!3 pole, 12 position switch individuallyselects one of the "36" componentsfor direct substitution.Contains,* 12-1 watt 10% resistor

from 10 ohms to 5600 ohms* 12-1/2 watt 10% resistors

from 10K ohms to 5.6meaohms

* 10-600 roll !eons Completely isolatedfront 100-mmfd. to Smfd.

* 1-10mfd., 430V Electrolytic* 1-40mfd., 450V Electrolytic* For Shop, lob, or outside service

AVAILABLE AT ALL PARTSDISTRIBUTORS!

INSTRUMENTS CORP.171 OFFICIAL RD., ADDISON, ILL.

Dept. H 36

POPULARSENCORE

PRODUCTS

TronsistorTester

leakageChecker

FilamentTester

VoltageRegulator

Bios Supply

1". ""un" "" ""1SENCORE

BandyR -C

Substitution Unit Ie liokely 36

I

TOP QUALITY PARTSTUBES-GOV'T OR MFG SURPLUS

1U4 . .. 390 6SG7 ... 84$6AC7 .. 89 2AF4a .. 896SL7 . . 88 39/44 .. 11617 . . .. 87 6AK5 .. 796SH7 ... 69 6AS6 .. 896517 ... 85 616 . . . . 69

12AT6 . 4906K7 96Y6 686AG7 . . 88

6AF5 4a . . 98

SELENIUM RECTIFIERS300 MA. Federal Brand 88e each350 MA. Federal Brand 98e. each

15K-41MC

15416R16U17G1-

41MC18820G I -

41MC20U204/R21421R22Q2201123G I-

41MC23Q/R23U24U24G1241124425U25Q-

21MC25R-

41MC26Q/ R27R27Q -

21M C27G1-

41 MC28U2811-

41MC

U.H.F. TUNER STRIPS-$2.39 set2811/R 384,1 5311-2811- 3911 41MC

41MC 39U 53U28Q- 39- 544/R

21MC 41MC 5411294/R .590/R 54Q29U 40U 55Q290- 4011 56Q

21MC 42Q/ R 57R -30Q 42U 41MC30Q- 4361- 57R

21MC 41MC 58Q30G- 43Q 59U

41MC 450 5911-31- 43R 41MC

41MC 46R 59Q-31011

47U464

60Q21 MC

5233U 47Q 60R33Q/R 4811- 61033R- 41MC 610-

41MC 48Q 21MC33Q 4801- 62Q33Q -G1- 41MC 64G1-

41MC 48Q/R 41MC330- 49U 66U

21MC 49R 67U33Q 50Q 674344/R 5011- 69Q34U 41MC 710-3511/R 50G1- 21MC35U 51Q 734-35R 41MG 21MC36Q- 5111- 33R-

21MC 41MC 91MC36R 52Q 74438Q 5361- 74U3811 41MC 774

Minimum o der $5.00. Merchandise shipped within24 hours f receipt of order. 25% deposit re-quired with order. F.O.B. Brooklyn.

FEDERATED TELEVISIONMART, INCORPORATED

513 Rogers Ave.. Dept. S. Brooklyn 25, N. Y.

New ProductsFor more information, write in ELECTRONIC TECHNI-CIAN'S new product code number on coupon on page 39.

BT MULTI -SET TV COUPLERS

Series of 300 ohm TV and "Exact -Match" Couplers feature maximum sig-nal transfer and isolation. A-102 2 -setCoupler feeds two receivers from oneantenna or mixes four antennas intoone line. It delivers 12-20 db isolationand only 7.5 db loss. In weather proof

cases, "Exact -Match" Couplers can bemounted indoors or on a outdoor an-tenna mast with A-100 kit. Kit providesrustproof bolts and assembly for easyinstallation. Blonder -Tongue Labs., 9

Alling St., Newark 2, N. J. (ELEC-TRONIC TECHNICIAN 9-1)

Charles MULTI -SET COUPLERSWizard 300 TV -FM coupler will op-

erate up to 20 or more sets from oneantenna without amplification in nor-mal signal areas. Designed for apart-ments, motels, TV sales rooms, homes,etc. Simple to install. Principal of elec-tro-magnetic coupling is used, with noseparate inductive or capacitive compo-nents. It contains two coupling elements

which make no direct electrical or me-chanical connection with antenna line,thereby reducing insertion loss. $1.95list. Also Wizard 450 for open linespaced 1" or more, $3.30/pair. CharlesEngineering Inc., 6053 Melrose Ave.,Los Angeles 38, Calif. (ELECTRONICTECHNICIAN 9-2)

Channel Master VHF ANTENNASSkyBlazer Model No. 334, an all -

channel VHF antenna designed foreconomy fringe -area installations, usesimpedance compensating inductancecoils, which do not resonate at highband frequencies. This results in a flatresponse pattern on all channels. TheSkyBlazer delivers higr front -to -back

ratios, and high gain on VHF. Full -wave parasitic directors provide extragain boost on channels 7-13. $21.53 list.Although not available in a stackedmodel, it can be stacked by connectingrod 335-3 at $2.22. Channel MasterCorp., Ellenville, N. Y. (ELECTRONICTECHNICIAN 9-3)

Aerovox MY LAR CAPACITOR KITSTwo new mylar tubular capacitor

kits, with humidity resistant ceramiccased units. Each kit contains an assort-ment of only the most popular TypeV84C capacitors widely used by servicetechnicians, and does not contain sel-dom used values. Units are packaged ina free, four -drawer metal cabinet with

divided plastic drawers. Kit AK -100consists of 75 Type V84C capacitorsrated at 600 vdcw in 12 values. KitAK100HS contains 76 units rated at 600vdcw in 14 values. Distributor Div.,Aerovox Corp., New Bedford, Mass.(ELECTRONIC TECHNICIAN 9-5)


Inel Rectifier ADAPTER KITThe SD -500 Kit offers a fast, simpli-

fied means of replacing all existingradio -TV silicon rectifier types. It con-tains an hermetically sealed, pigtaildiode which may be wired in to replaceaxial lead types, or plugged into exist-ing fuse -clip type sockets. It can op-erate at 100°C ambient with resistive,inductive or capacitive load, and can

supply full -rated power under normalconvection cooling. The SD -500 mayalso replace existing selenium rectifiertypes, or if a direct mechanical replace-ment is required, Unistac TV -500 maybe used to replace selenium units withno conversion required. InternationalRectifier Corp., 1521 E. Grand Ave., ElSegundo, Calif. (ELECTRONIC TECH-NICIAN 9-4)

Motorola CABINET REPAIR KITCabinet repair kit is designed for the

use of the service technician as a newservice aid. Intent of the kit is to supplythe materials and knowledge necessaryto perform minor cabinet repairs sim-ply and easily without the knowledgeor know-how of the professional fin-isher. Included are 13 jars of stains,solvents and pigments that can be usedin combination to duplicate exactly anyfinish. Touch-up brushes, steel wooland complete instructions are also in-cluded. Motorola, Inc., 4545 W. AugustaBlvd., Chicago 51, Ill. (ELECTRONICTECHNICIAN 9-34)

ITT SILICON RECTIFIERSLine of silicon rectifiers for home en-

tertainment applications are rated up to500 ma dc output at peak inverse volt-ages up to 500 v. and ambient tempera-tures up to 100°C. They can be suppliedwith a variety of mounting devices.They are ideal as replacements forselenium rectifiers. Also, industrialrectifiers have ratings up to 3 amperes

at 600 v. are usable at ambient tempera-tures up to 150°C. They are reliablecomponents for power supply applica-tions and for use in instruments andother types of industrial electronicequipment. Components Div., of Inter-national Telephone and TelegraphCorp., 100 Kingsland Road, Clifton,N. J. (ELECTRONIC TECHNICIAN9-11)

Workman PIN STRAIGHTENERST -1 pin straightener for 110° picture

tubes having the RCA -type wire pinbase is made of durable black bakelite.It is designed so that it can be used inlimited space. After use, it can be eas-ily and safely removed from the base ofthe picture tube by means of fingerpressure. No twisting or "rocking" isnecessary. The glass button base ofthese 110° tubes is easily fractured andto try and straighten bent pins with apair of pliers is to run the risk of crack-ing the glass. Workman TV Inc., 309Queen Anne Road, Teaneck, N. J.(ELECTRONIC TECHNICIAN 9-29)

SERVICE MEN KNOW THERE IS JUST ONE

HUSHReg. U. S. Pat. Off.

Chemically engineered for tuners andswitching mechanism

Hush comes in a 6 oz. pressure can with sufficient pressureto reach all contacts to wash -away that dirt, leaving cleanand positive contacts, protected with a lasting lubricant film.

Hush also available in 2 oz., $2.25 net8 oz. and 32 oz. containers.

EVER -QUIETReg. U. S. Pat. Off. ,

Since 1949 the Original Volume Controland Contact Restorer

EVER -QUIET is a free -flowing liquid that leaves no powderresidue. Scientifically designed to seep around the shaft andpenetrate the control or potentiometer, cleaning and contactsand leaving a safe protecting film. Harmless to metals, wireor carbon. Will not affect inductance, capacitance or resistance.

2 oz. bottle with handy dispenser(32 oz. size available) 79 net

See your distributor or write to

CHEMICAL ELECTRONIC ENGINEERING, INC. Matawan, New Jersey

NIS DOWN.,

EVER -QUIETCONTROL

ANN

CONTACT RESTORE,.

a.CANSLUBRICATES

Peal TCTSiY _ RADIO ANO

&IONIC CONTACTS

/11FLAMMARLI

TRUE HI-FIfor PUBLIC ADDRESS

VOICE and MUSIC

WT -6 NET $34.50support stand only,

SS -4 NET $12.60

exe4d-ATLASCOAX -PROJECTOR WT -6for wherever HI -Fl is a MUST, indoors or out. . entertainment places: theatres, auditoria. . . industrial music & paging systems . .

outdoors: carnivals, pools, boat clubs . .

home patios, gardens . . permanent orportable installations.

ALL-WEATHER

- install it, forget it! -H IGHEFF IC I EN C Y .. COMPACT ..

True HIGH FIDELITY TWO-WAY system -not just a "compromise" of two hornscoupled to a single diaphragm. The WT -6comprises a weather-proof cone type driver(with 6 -inch throat)coupled to its individualwoofer horn; a separate pressure -type driverloaded to its separate tweeter horn. Thebuilt-in crossover electronic filter supple-ments the electro-mechanical frequency -limiting characteristics of the 2 individualreproducers - providing for smooth fre-quency division as each speaker functionswithin its engineered range of frequencies.Universally adjustable "U" type ruggedsteel mounting . . . finished in high tem-perature baked modern beige enamel.

Power RatingFreq. Resp.ImpedanceDispersion

Dimensions

15 watts continuous140-15.000 cps8 ohms120°Bell opening 15",overall depth 12"

See the WT -6 at your local distributor.Send for complete catalog.

ATLASSOUND CORP.1445-39 St., Brooklyn 18, N. Y.

At/as Radio Ltd., Toronto, Canada


NEW 110°C.R.T. ADAPTERS

For ALL RCA & Sylvania 110° Tubes

G -C RCA 110° 3 AdapterLead To Standard Base

No. 9426... List $2.25

G -C RCA 110° 3' ExtensionLead To 110° Base

No. 9428... List $2.25

G -C Sylvania 110° 3' AdapterLead To Standard Base

No. 9431 List $2.25

G.0 RCA 110° 3' Test LeadTo Octal Base

No. 9427 List $2.50

G -C RCA 110°3' Test AdapterLead To Standard Socket

No. 9429 List $2.50

G -C Sylvania 110° 3' TestLead To Octal Base

No. 9432 List $2.50

G -C Sylvania 110° 3' Eaten- G -C Sylvania 110° 3' Testsion Lead To 110° Base Adapt.lead To Std.Socket

No. 9433...List $2.25 No. 9434... List $2.50WRITE TODAY . .. FREE CATALOG!

GENERAL CEMENT MFG. CO.division of TEXTRON INC.

Western Plant: Los Angeles 18, Calif.Main Plant: ROCKFORD, ILLINOIS, U.S.A.

selling TV parts?for the right replacement

you'll find itfaster in the

ASTERnew1958 edition-world's largestelectronic catalog only *3.50 atyour local parts distributor - nowFree! Write for Panel Lamp Chart.

THE RADIO -ELECTRONIC MASTER60 MADISON AVE., HEMPSTEAD, N. Y.

130

Sencore BATTERY TESTER

Tru-Load battery tester, Model BT -101, is capable of checking all types ofdry and mercury cell batteries under"optimum" load as specified by the bat-tery manufacturers. Mercury cells ofthe hearing aid type can be checkedwithout danger of damage. The BT -101is especially useful in transistor. Corn-

plete with test leads and carrying han-dle. A complete battery chart, listingover 100 different types of batteries bymanufacturers number, is attached.Dealer net is $15.95. Service Instru-ments Corp. (Sencore) 121 OfficialRoad, Addison, Ill. (ELECTRONICTECHNICIAN 9-6)

Kingston ABSORPTIONANALYZER

New absorption analyzer, Model PO -1, is designed to add the electrostaticpick-up and other analyzer featuresto conventional oscilloscopes. Used witha scope in the same manner as a pre-amplifier, the P0-1 makes it possible topick up and trace signals electrostati-cally in any electronic circuit which hasperiodic wave forms between 3 and 240mc. It increases the sensitivity of scopesfrom 10 to 100 times depending on thecircuit. A built-in speaker providesaudible signal tracing. $197.50. KingstonElectronic Corp., Medfield, Mass.(ELECTRONIC TECHNICIAN 9-7)

Acme VOLTAGE STABILIZERA new automatic voltage stabilizer

that will maintain a 118 v. output eventhough the input may vary from 95 to130 v., is designed especially for TV re-ceivers, amplifiers, hi-fi sets and otherequipment, where excessive or lowvoltage often cause performancetroubles. Rated at 200 VA, it can ac-

commodate 24" TV sets. Noiseless andfree from harmonic radiation. Built-inrelay automatically disconnects primarycircuit when TV set is turned off, stop-ping coil magnetism. Acme ElectricCorp., Cuba, N. Y. (ELECTRONICTECHNICIAN 9-8)

Castle Television Tuw Seim/ice

Suppliers of rebuilt TV

FOR THE EXACT TUNER REPLACEMENT USE A CASTLE REBUILT UNIT

Aligned to Original Standards Under Laboratory Conditions.

SAME DAY SERVICEExchange Tuner shipped same day.Any Tuner. for which a rebuiltunit Is out of stock, overhauled& returned within 48 hours inmost cases.

IMPORTANT.Price includes WORN parts only. DOES NOT include tubes: nor partsmissing or damaged by abuse and n gligent handling.Forward defective tuner complete with GOOD tubes and ALL damagedparts; quote make and model. We will ship C.O.D.

1723 W. LUNT AVE., 152 MAIN ST.,CHICAGO 26, ILL., TORONTO 13, ONT.,

U.S.A. CANADA

95 Dealer NetEACH TUNER

CombinationUHF/VHF units. $19.90

90 DAYS WARRANTY

AMbassador 2-7505 OXford 4-5637Tuners to leading manufacturers. technicians & service dealers, coast to toast.


INDEX TO ADVERTISERS

September, 1958

Acro Products 94Aerovox Corp. 6

American Microphone ManufacturingCo. 68

American Television & Radio Corp. 123Amperex Electronic Corp. 93

Amphenol Electronics Corp. 58

Atlas Sound Corp. 129

B & K Manufacturing Co. 112

British Industries Corp. 63, 125Bussmann Manufacturing Co. Cover III

Capitol Radio Engineering Institute 125Castle TV Tuner Service 130

CBS-Hytron 57Centralab Div., Globe -Union, Inc. . 109Channel Master Corp. 10, 11Charles Engineering, Inc. 127Chemical Electronic Engineering, Inc. 129Chicago Standard Transformer Corp. 116Cleveland Institute of Radio

Electronics 118Collaro 46Columbia CD 57Cornell-Dubilier Electric Corp. 22, 23, 24

Delco Radio Div., General Motors . 101

De Ro Electronics 98Deutschmann Corp., Tobe 21

Duotone Co., Inc. 93

EICO 71

Electronic Technician 40Electronic Utilities Co. 113Electro Products Laboratories 124Electro-Voice, Inc. 44, 45Erie Resistor Corp. 95

Fairchild Recording Equipment Corp. 98Fanon Electric Co., Inc 72Federated Television Mart, Inc. . 128Ferrodynamics Corp. 96

Garrard Sales Corp 63General Cement Manufacturing Co. 130General Electric Co., Tube Dept. 8, 9, 20General Electric Co.,

TV Receiver Dept. 13General Electric Co., Hi-Fi Div. . 70Gregg Electric Sales Co. 121Grommes 62

Harman-Kardon 100Heath Co 69Hickok Electrical Instrument Co. . 127

International Resistance Co. . . Cover II

Jensen Manufacturing Co. 74Jerrold Electronics Corp. 117JFD Electronics Corp. 4, 5

Kingston Electronic Corp. 122

Luxo Lamp Corp. 124


Mallory & Co., Inc. P. R. 110, IllMerit Coil and Transformer Corp. . . 132Milwaukee Resistor Co. 116Multicore Sales Corp. 125

Ohmite Manufacturing Co.Oxford Components, Inc.

12295

Philco Corp. 2, 3, 65Pickering & Co., Inc. 97Pilot Radio Corp. 53Planet Sales Corp. 119Precision Apparatus Co., Inc. 104Precision Electronics, Inc. 62

Quam-Nichols Co.

Radiart Corp.

91

24, 25Radio Corp. of America . . 18, 102, 107,

Cover IVRadio Receptor Co., Inc. 106Raytheon Manufacturing Co.Rek-O-Kut Co., Inc.Rider Publisher, Inc., John F.Riemer Co., Inc., DavidRockbar Corp.Rohn Manufacturing Co.Ronette Acoustical Corp.

2642

12096461991

Sampson Co. 113Seco Manufacturing Co. 131Service Instruments Corp. 120, 125, 128Sherwood Electronic Laboratories,

Inc.Shure Brothers, Inc.Sonoramic TapeSouth River Metal Products Co., Inc.Sprague Products Co.

929996

120105

Technical Appliance Corp. 93Tobe Deutschmann 21Trio Manufacturing Co. 12Tung -Sol Electric, Inc. 114, 115

Ungar Electric Tools, Inc. 7United Catalog Publishers 130University Loudspeakers, Inc. 61Utah Radio & Electronic Corp. 51

V -M Corp. 59Volkswagen of America, Inc 17

Walsco Electronics Manufacturing Co. 108Weller Electric Corp. 14Westinghouse Electric Corp. 16Winegard Co. 96, 103Wright Steel & Wire Corp. 126

Zalytron Tube Corp. 126Zenith Radio Corp. 15

While every precaution is taken toinsure accuracy, we cannot guaranteeagainst the possibility of an occasionalchange or omission in the preparation ofthis index.

the Start!

ECO

FAST!ACCURATE!

Test EquipmentSaves time ... makesmore money for you!

WRITE TODAY FOR COMPLETE

SPECI FICATIONS AND FEATURES!

Outstanding Reliability and Performance! Unique, Time -Saving Features!

Low First Cost Makes You Money From

107 TUBE TESTER-Outstanding per-formance and accu-racy- provides 3important tests:amplifier types test-ed for gain by Dy-namic Mutual Conductance method-powertypes tested for cathode current by CathodeEmission method-all types tested for shortsand grid error by Grid Circuit Test devel-oped and patented by Seco. Dynamic Mu-tual Conductance Test pre -wired to elimi-nate elaborate set-up. Cathode EmissionTest done by free point pin -selector method-will not be obsoleted. Completely self-contained in portable carrying case. Fur-niched with handy flip chart for fast tubeset-up data.MODEL 107 $139.50 NET

GCT-8 GRID CIR-CUIT TUBE TESTER-Perfect compan-ion to any tester-checks critical"control grid" con-dition of vacuumtubes fast. accur-

ately. Electron eye tube indicates faults ata glance. As many as eleven simultaneouschecks-automatically.MODEL GCT-8-Kit $19.95 NETMODEL GC7-B--Wired & tested 29.95 NET

. 2 0 8VTVM -"Fool-proof"-many new fea-tures! Easy - to - read41/2" 200 microampmeter mounted on slop-ing panel -7 DC, 7AC, 7 ordinary Ohmranges, plus RETMA(EIA) Ohm scale tocheck standard color -

coded resistance values and tolerance limits.Specially designed "shift -lever" type func-tion switch identifies and automatically con-nects proper probe. With stand, 40" leads,and common lead with clip.MODEL 208 $74.50 NETLeather, felt -lined carrying case $9.95 NET

PS -2 BATTERY ELIMINA-TOR-Compact unittakes place of batterynormally used to operateand service low -poweredtransistorized equipment.Supplies clean, filteredDC - can't be damaged

by a short. Quickly spots faulty batteries bysubstitution. Output continuously variablefrom 0 to 15 V.-ideal for experimenters.Complete with jacks, leads, and clips.MODEL P5-2 $13.95 NETFB-4 FLYBACK CIRCUIT AND INDUCTANCEANALYZER-Quick "yes" or "no" answeron condition of flyback transformer andyoke -100% accuracy! Resonant frequencyand "Q" meter principle used-will not beobsoleted. No disconnecting-no charting-checks complete horizontal coil circuit.Complete with self-contained power supplyand matched 18" leads.MODEL FB-4 $38.95 NETFP -1 FILAMENT CONTINUITY CHECKER AND90 VOLT BIAS SUPPLY PACK-Checks con-tinuity of TV and radio -type tubes-perfect

jobs.MODEL

many bias substitutionMODEL FP -1 $12.95 NETGet the complete story on Seco's exciting lineof test equipment. See your distributor-orwrite for complete information today!

0

SECO MANUFACTURING CO.5015 Penn Avenue So.

Minneapolis, Minn.

131

Acetatebutyrate

tire

MylarInsulating

tape

VinylInsulation

/I Added protection

to assurebetter insulation

Fully magneticCOnoer shielded

Moldedanti -coronahigh voltage

lead

Flybacks

Heavyterminal

board

High gradesteel supports

Secure itsoldered

connections

Polyethyleneinsulation form

High qualitypowderediron cores

Adjustable

mountingbracket

Silicone

Varnish Impregnatedhigh qualityCopper wire

Bakeliteterminal board

Parasiticresistors

5% tolerance

High qualityInsulated

leads

Yokes Position

coilform lock

micacomposition

Ceramiccoil form

Transformers

Utz wirefor high "0"

Drawn aluminumelectrostatic

shield

Color codedleads

Shell corePermeability

tuned and magneticshielded windings

Siliconetreated silver

mica. formaximum

stability dueto humidity

effects

rf-ifTransformers

and Coils

M E 1:Ro I a" COILSand TRANSFORMERS are the

first choice of Independent ServiceDealers and Technicians

FIRST in Quality FIRST in Sales Aids!

S.nr 1.14BETTER

ELECTRONICCOMPONENTS

"COMPARE IT WITH MERIT"MERIT COIL, AND TIR.A.1TSFORNIM1:2, CORP.MERIT PLA_ZA. HOLLYWOOD, FLORIDA

132 (152 pages in this issue including Circuit Digests) ELECTRONIC TECHNICIAN September, 1958

To

VH

FA

NT

.

00

LIL4

LSF

- Mt -F

1-FT

RA

PC

2.T

RA

PTRAP

R27

tOO

K71

CI

AN

T.

18M

AT

CH

ING

TR

AN

S.

1730

12

PI

l0 0

1000

31-0F

RO

NT

L2 5

Ci

C433

St -

RE

AR

VH

F TU

NE

RK

RK

47P/TK

RK

3A/B

CS

.1C31

v 1

229--°'34-3

68.074+

235V. R

-F A

MP

L.

ISLIDLI1

L18

LI9

LI

LI3LI2LII

L/

03

SI.0

L20 II4

FR

ON

Ti_23

L23

C32

L22.22

Rill

MA

W100

L20

51.0R

EA

R 12,!I.

270-C

H10.

TP

IR

9100K

=51-13

13

FR

ON

T in.109.8°7

.

R24

C27

is1.5t

000

TL4

RIO

L46/68K

L45

C17

L440.82

L43'M

mF

.L42

-I

C3322

10

C7

0.34-3 11-

R6

1000H

L27L28

1.29

L30

3

20

RS

I ME

G

120VO

V.RI

IC23

51051

10K10001

114E0P

gru J 103-F

IV

IEW

RE

AR

r -.- 7I

4 10---*+ 252 v.

132

1

a 1.+__i---

6'3V- Y

0211000

_CIO

-82

AV815

51-B000

RE

AR

L36tLS

3 L35L34L33

Rii

1323300

C2

C-28

0.91 Mm

F.

474

-H

C is aC

1810 7.'4'414

3 Tx

SI-A

FR

ON

T

L48L49

LSO

2

V2

GC

C18

68674./,R

o1j

54

41°N 5

S%

2020L54

5LKR1050

270IAM

C1050

.011

*O

051050

1000 .F -IC

20

1's

:3160

7.541

L56

R17IS

V2

6C0.8

0sc.4 MIX

ER

UH

F 1.F

AM

PL

.51-4R

EA

R

R221+

248,4100 K

n.9

tL52

FR

ON

T A

ND

RE

AR

SE

CT

ION

SO

F 51.4 5-C

.D V

IEW

ED

FR

OM

FR

ON

T W

ITH

CO

NT

RO

L SH

AF

TIN

I -F P

OS

ITIO

N

+123-128V

.C

15_02

70304

*5C

16100

C26 -t

1000 I18

CO

NY

.

-2.6I T

RA

NS

.-6.5v.

r- -C

2551

+122V

CID

Z10-160

,I

3

R7

27K122V

113C

3531

1000IC

24C1111... 3

R25

*77

470 I Rg.

R26

4701 470

T3

ST

AG

E T

R.

32V

HF

UH

FI.F

INT

ER

- P

80244

Tai

4 0E-,

PA

RT

OF

510-4j-Jv

Tl

TO

UH

FA

NT

UH

F T

UN

ER

- KR

K 66A

/J

Fr_41

4p2-_B

C813

( ,, 4802-C1

0801C

8030.5

C81211 M

MF

C011

1m

o m.S

F

L502LO

OS

CB

IOV

801L604

6AF

4AC

809C

R 80 I

OS

C.

20.5-3

L808

Jaol1000806

5551052IS

K

(807**IN

SO

ME

UN

ITS

P1301

1000it105c M

111K

C802AC801

C803

L802

L801

6801470 K

2Lsos

UH

FT

UN

ER

-KR

K66A

/T(A

LTE

RN

AT

E C

IRC

UIT

)

1802-8

1803

CR

801 080811482A

250

L

C813

L 810

f0.5

C812

MM

F

811I

1.5

can)1.5

V801

6AF

4AC

809O

SC

.6

2-6

-L-

I

3

*C

100051052

1008060151<

YD

UH

F0 P

ILOT

LIGH

T

A

VH

FC

HA

NN

EL 0

LIGH

T_

PW

3001S

T F

IX. 1-F

L301

GR

ID C

OIL

P104

W133

I A2

°1.trzItc

C 301 1

(BI8 T

F A

.G.0

OV

.

R301

(933Kr.2

1_306

Septem

ber .1958

PW

200I

( 101

V 301

6C F

61S

T. P

IXI -F

AM

PL.

C302

5000

5

F-77,1S

OU

ND

TA

KE

-O

FF

TR

AN

S.

3A

4.5 MC

.N

OV

.-II

0E7

08

letC

2011(2031R 202

4-

39,

.01T

82

.._.t

L__ 9I

R201

0202

47K56

II

L_.,.. -J C

P12301

ELE

CT

RO

NIC

4. mot

TE

CH

NIC

IAN

WE

IC

IRC

UIT

DIG

ES

T

V 201

6AU

6S

OU

ND

F A

MP

L

2

T 202

DR

IVE

RTRANS.

4.5 MC

rA--

1.C20712

1

1

36*WV

C205 C

206 118V

.-°1

12

C20 411.C

215

.00271/680R

2041000

R203

1000

*OV

.

V202

6DT

6S

OU

ND

DE

TA

UD

IO A

MP

L

2

C208.°1 I

42.9V.

R206

560

+2 IS

V

7+

t -5V.

6 R207 I1-

C210. e 720D

1201(1-

10D

"T

RA

NS

.T

R208

C2I1

R209

4701<1047

560K5101-5I M

EG

VO

LC

209

Ia

CONTR.

-R

20515K

.

v2034

3

I+

252V.

+150V

.

10213T

680D

101

F*

C212

.001H

ov.-

1-7

RC

AT

V C

hassis KC

S122A

, B,

C, D

, E, F

, H, J, K

, L,M

, N, P

, R, A

D, A

E

V203

TIO

t6055

--,OU

TP

uT T

R.

AU

DIO

AU

DI

0u+

+,87,

18Lu5

+8.2+

R211

270

..C121.0

I 20 ME

R102

1800T

C 121-8

1 10 MK

+ 252V

.

IN K

CS

itt-AR

103 IS O

MIT

TE

DC

12.2 IS O

MIT

TE

D02I2 IS

.0022C

214 IS .0033

7 3011S

T. R

IXI- F

TR

AN

S43.0 M

C.

106 V.

+II4V

C304

R305

4 470 I 6808302100 K

R307

1303P

RIN

TE

D151(

1501(

K +

114V.

306C

305 1.001

3+

1259.

V302

V303

6036 22°43R

..

60567303

CR

3011305

D. P

M2N

D.

18 MU

- HL 110

250. PIX

I -F T

RA

NS

.3R

D. F

IX.

I -F T

RA

NS

.D

ET

.G

RN

-BLU

Oa

I -F A

MP

L.45.5 M

C.

I -F A

MP

L.44.5 M

C.

YE

LG

RN

15LUY

EL

7

* +228V

.15+

124V.

5w

Ov.

_O.

VC

3I1C

pl l17

+245,

C30 81

'001TR

309I

680- C

306R

312190KI .001

fmI -F

A.G

.C.

1

6I35V

C3I 2

.001 I/1-

OD

R3I0

C3I0

5311L304

1801004.7

470O

N P

RIN

TE

D

C307

C509-

1.0047.00471 0 H

+252V

.X

+150V

.

C31'

PW

400

V401-4

64W8A

VID

EOPL .

-0.49+.

R402

220 l<

f ma

1

5417

-.-1.2

II

R422 R

424 R423I

I82K

820K 68K

1

L,....,...,,

R401 C

4013900

0.1

C 402

1.401.01

MO

MU

+I

88,...8?5- R406

331(

* IN K

RK

7SA

C36 15 S

OM

ME

IN K

OS

Et m

, N, A

D, A

E, -

0103 IS 12M

W, 12301 IS

47K

All resistance value in ohm

s. K =

1000.A

ll capacitance values less than 1in

MF and above 1

in MM

F unless other-w

ise noted.D

irectionof arrow

s atcontrols

indi-cates clockw

ise rotation.A

llvoltages

measured

with

"Volt-

Ohm

yst" and with no signal input. V

olt-ages should hold w

ithin ±20%

with 117

v. a -c supply.

Measured w

ith 1 megohm

, 1/2 watt re-

sistor in series with probe.

Balloons00 etc., show

n on schematic

indicate points of observation of thew

aveforms show

nPW 600

-9.3+.

+ isv

R607

3300

C605

19'33

V 601

6CG

7M

OR

I?. OS

C

*+ 195V

I9

6

7

4

R404

1 ME

G.

R405

22003

+252V

R101.4

3000C

ON

T.

St

RI05

RA

ST

7if,

3300

9

L402L403

4.5 me 300 W

MT

RA

, OR

NO

RN

OR

N

16°+' C

404 R408

276800

ov.R

426330

L404w

ooN

O -21

C405

61131-

0.22W

M

C403

0.47

GF

CK

1G.

too+

150V+

252V

R416

3901<.A

4/.

v401 -B6A

W8A

t5T. S

YN

C.

R4o9 C

406R

41827K

.02710 M

EG

.

R412-irrjr 3

ra2,30 560KJ 330_

4050 141-14

C408

RN

-085330

RN

. .

R414

R4I5

2.2 ME

G.

270 K

79V.

4

R 4It

ISO

K

KO

LO

11'R

106+

150VI

4

200 K2

BR

IGH

TN

ES

ScoN

TR

3

C502 _

6CG

7V

501-4

+6, y.0

SLIT

YP

NU

CT

220O

D

R502* *583 -C

SO

I2700 ,

18k-.033 2

AV

4 , _ , 2 vR

5018

560K 4 R

504, 33K

3

OF

+ 150V

.

R505

82K

PW 500

It 109133015

LGO

26812

I(60, H

01517 FR

EQ

R 99

470C

OIL

C 608

560K

-72

eT

8_4_11 0E

C6101 C

GO

7kt,T

580.01

T.

AV

EC

OL

661156K-W

G

2R

14640 KN

OR

. HoLD

CeN

TR

RI I

i

10 ME

G.

R104

600.6 A10 M

E6.

I -10R S

WE

EP

OU

TP

uT+

WM

.

C504

.0056

125076.8M

EG

.

V501-13

6CG

7V

ER

T.

OS

C.

R506

18 K-76V

.C

SO

G.0047

125091.2M

EG

2...-

31

R110

I.5 ME

G-

VE

RT

. HO

LDC

ON

TR

.

+252V

-2IV

1 MI°

10-1607

>R

6I2109

NO

R. D

RIV

ET

C609

-1E-0

660

An E

ditorial Service of E

LEC

TR

ON

IC T

EC

HN

ICIA

N, IN

C. * 480 Lexington A

ve., New

York 17, N

.Y.

6 +164V

.

7

3

C 1120.1

2

csos'51° I ooss.022 v.

7)3098

IL]

R 07

S M

EG

.H

EIG

HT

o NT

R

v5026C

Z5

R508 C

507 (5126200

.01.027

VE

OR

L,Ty.P

S,W

yP--11..4

-LR

R55(1123

Alfrilr

9 +23"I C

51318K

-23v3-6+

.024015+

..r.C

oSi029 R

252i K

°1

0C .51151

i 4R15014

4,v5 0 1

-

8108470 K

3900 0K4

2

R 112

1.5 mE

G.

VE

RT

. LINC

ON

TR

3

I

R114.IS

O

TIO

*2V

ER

TIC

AL

OU

TP

UT

TR

AN

S.

r- --1B

LUI

,YE

L-_1

C120-5

RI32

20 MF

. /220

+252 V

.R

I13680 I<

R128

3300C

ilS.04.7

vios21C

E P

4K

INE

SC

OP

E

R122

C116

22 K10047

a7

OV3+

252V.

.8101, JloSfoloo ott

6;1O

CR

1,E44) C

LOC

KO

NLY

MO

TO

R

.5103A

UT

O -T

IME

DO

R M

AN

UA

LO

N -O

FF

SLL1

11g/ 12147100 K

1 -s -A44- T

103C

108C

139H

. vT

RA

NS

0.1.o6a 1

4 + 1811/

0.1

C 110

R116

0.27 I100

F101

0.3 AM

P+

252.V.

RH

868 K

+14,200V

.R

1211000

V 102

R 120 163G

T/1B

3GT

0.39H

.V.

RE

CT

.V

104

5U4G

BL.V

. RE

CT

.

C117

C118

3903901-

+5 B

OO

ST

L

C113-

_C130

0.11107

.0391.5 M

U -H

5istrs

-C114

'270

DE

FLE

CT

ION

YO

KE

V103

1

C112302

6AU

46TA

lioD

AM

PE

R18

8y

,C

i31

_22-

VE

RT

. CO

ILS 51.4K

8°L103

1104 18

5

RI24 R

133 RI2S

ISO

3.5150

CO

LD1

YE

L

PI02

PIN

VIE

W

WW

-114,.

RI23

700

5102R

EA

RV

IEW

More D

ataon

Reverse S

ide

4

7104

UR

N- R

ED

.1

150.187'

1

RE

D .11

6R24 V

EL

.260V.

VE

L

c100120,4-14

F02

10

1.108

*CU

' J103 -F

RE

AR

VIE

W

5104T

NR

S.1-

SW

.

+252V

+150V

.5101

RI26

OW

-OP

ES

W4700

CI21-4

C/2I-C

C107

100 MF

IM

FI1470 iisv. "A

,S

UP

PLY

Electronic T

echnician

CIR

CU

IT442D

IGE

ST

ELE

CT

RO

NIC

J. 4

.,.%

TE

CH

NIC

IAN

444

CIR

CU

IT D

IGE

ST

fli

Tra

nsis

tor

Rad

io P

750A

0o

0

2 I 1

6

Ele

ctro

nic

Tec

hnic

ian

CIR

CU

IT44

3D

IGE

ST

GE

NE

RA

L E

LEC

TR

IC(C

anad

a)

Tra

nsis

tor

Rad

io P

750A

Sep

tem

ber

195

8

a

xM

I

8

4.0

II

-

-,NTYTEN

-

ri

DI

-8

vo

0.22

aim

,:Ill

+4I

0.11

310

0T

RI

L.LS

L I

FM

,F' F

TR

AP

TR

AP

c.,

TR

AP

-.

5

5C

4

RE

AD

RE

AR

33

VH

F T

UN

ER

FO

R K

IIK

46P

KR

K46

T, K

RK

72A

OR

KR

K72

B

VH

F T

UN

ER

UN

IT -

1K

RK

77A

KK

K 7

8AK

RK

79A

/C/H

,KR

K B

OA

,K

RK

81C

( K

RK

4G

P/T

, KR

K 7

2A/B

)

CS

-C31

220

ro.3

a,3

650.

7AR

F A

MP

L

liOv

10

I ME

Gy

2B-

220

C7

-13

,0.

543

1J'

iRN

IEG

C21

I27

0010

00C23

-10

00

0 10

511

ME

G.

18,

P10

50-0

CIO 0. D

c

SI-

C

PIN

VIE

W

R6

vzT

C10

50-1

L 2

T

6608

6507

ALL

26

L79

130

RIO

2109

100K

100K

51-9

,Tr

FR

ON

T,.0

5 39no

_.L4

1

Si

RE

AR

sr`

CIO

bR20

?100

0

c20

00l0

00

00 V

NF

.1.

CL'

ILrg

1612 CIA

saoo

OM

ITT

ED

ON

;t C

OK

RK

DO

R .8

1C

$0 O

MIT

TE

D O

NLS

4T

21Z

2,78

7,A

c, 8

0A.

1.5

MU v2

6C0.

1305

CM

IRE

R

L9 LAT

III).

L46

L4 LA,

L43 LA

E

3101

/R10

1BM

AW

SW

ITC

H8

VO

LUM

E,

CO

NT

RO

L

VH

FF

INE

TU

NIN

G

VH

FC

MA

N N

E L

SE

LEC

TO

R

UH

FT

UN

ING

RIO

IAC

ON

TR

AS

TC

ON

TR

OL

V2

SC

O8

OS

C/M

IXE

RJe

Ts-

/

VH

F T

UN

ER

( A

LL M

OD

ELS

)

VI

SB

07A

R -

F A

MP

.

V8O

I6A

F4A

UH

F O

SC

R14

6H

OW

HO

LDC

ON

TR

OL

R10

6B

RIG

HT

NE

SS

CO

NT

RO

L

R11

0V

ER

T. H

OLD

CO

NT

RO

L

RC

A7V

Cha

ssis

KC

SI2

2A, B

,C

, D, E

, F, H

, J, K

, L,

M, N

, P, R

, AD

, AE

Ele

ctro

nic

Tec

hnic

ian

CIR

CU

IT D

IGE

ST

442

AN

T

F10

1F

US

E

CH

ASS

IS R

EA

R V

IEW

L

C10

2I -

FLI

NK

PW

600

1P

RIN

TE

D W

IRIN

GH

OR

IZ O

SC

AS

SE

MB

LYI

6CG

T(v

601

NO

R. O

SC

.B

CO

NT

RO

LE

601

\--ic

SIN

E W

AV

EC

OIL

oI J

DE

NO

TE

S K

EY

wY

(O

PE

N P

INT

LO

CT

ION

FoR

MIN

IAT

UR

E T

UB

ES

)

T 1

01

AU

010

OU

TP

UT

TR

AN

SF

OR

ME

R

L301

1ST

PI%

I -F

GR

ID C

OIL

PW

300

PR

INT

ED

WIR

ING

PIC

TU

RE

i-F

AS

SE

MB

LY

V30

1G

CE

'Sly

<70

2***

\V

303

SC

S6

SC

B6

' PI%

1F

2501

,1X

I -F

3"`°

PI%

I -F

AM

PT

301

4.1\

......

,....W

/T

302

4,...

......

.....,

P.,

7303

1ST

PIG

2ND

PIK

3RD

PI%

I -F

TR

AN

SI -

F T

RA

NS

.i-F

TR

AN

S.

___

_ _

J

C10

9N

OR

.D

RIV

E

.FV

103

\64

U4G

TA

j

DA

MP

ER

/

0WIDTH

L302

47.2

5 M

CT

RA

P

V10

210

30T

/1E

1367

11

11V

RE

CT

./

1

KIN

ES

CO

PE

SO

CK

ET

v401

6Aw

BA

VID

EO

AM

PL

& Ir

SY

NC

.

PW

400

PR

INT

ED

WIR

ING

VID

EO

B 1

ST

SY

NC

.A

SS

EM

BLY

-CLI

ON

FIL

TE

RC

HO

KE

) /

Pw

200

PR

INT

ED

WIR

ING

-I

SO

UN

D A

SS

EM

BLY

V20

360

35A

UD

IOO

UT

PU

T

tisA

nr.T

erC

aTT

RA

NS

.

V20

260

T6

SO

UN

D D

E T

AU

DIO

I72

02q5

DR

IVE

R1

TR

AN

S

SP

AI

V20

1S

AU

SS

OU

ND

AM

P I

-FI

/._, '

.---

-Tf

I 1

I1

-I

SO

UN

D,,,

,I

7201

I TA

KE

-O

FF

L--

--T

RA

NS

.

Cs

/-)

,'',..

e...,

,,,,./

RIO

TR

II2 T

.<4.

HE

IGH

TV

ER

T L

IN./

.1-'°

/1 S

T--

''''--

T-e

--

-/

T10

2

I'S\

VE

RT

OU

TP

UT

SC

G7

/)T

RA

NS

/V

501

SY

NC

OU

TP

UT

B V

ER

T. O

SC

....

..._.

.,

PW

500

PR

INT

ED

WIR

ING

VE

RT

8 S

YN

C. O

UT

PU

TA

SS

EM

BLY

(0702*

.\6C

25V

ER

TIC

AL

OU

TP

UT

-.1

\

T10

4P

OW

ER

TR

AN

SF

OR

ME

R

R27 OO

K M

AT

CH

ING

IBT

RA

NS

.

51.0

FR

ON

T

51-C

LT

FR

ON

T 1

25L2

4LO

TC

3212

2

C19 10

1148

LSO

LSI

CID

480

FIN

DT

ON

ING

OM

EM

IND

ITS

T. 1

2IN

.18

IT

RY

ef 1

.C

45 i

Wo.

Ca.

m.)

. seL

ecT

oR S

w. S

I*C

36 IS

68

mA

IF IN

eeF

RO

NT

HID

RE

AR

SE

CT

ION

S V

IEW

ED

KR

K 7

2AF

RO

M F

RO

NT

AN

D 5

NO

W0

IN C

NN

.011

L

L,..

.,,,,,

,..

TR

AN

S.

CZ

Sox

v1

1

RT

1[35

27K

e 11

000

71+

121Y

.

C14

0.34

R25

347

0v.

?:

1152

Ra

1000

470

R10

0V.

P -

P1

NO

RM

AL

.N

TR

AS

T

022

Vp- 45

V.

P -

P

75V

.P

-P

203

V

P -

P

190

V.

P -

P

Mor

e D

ata

on R

ever

se S

ide

An

Edi

toria

l Ser

vice

of E

LEC

TR

ON

IC T

EC

HN

ICIA

N, I

NC

. * 4

80 L

exin

gton

Ave

., N

ew Y

ork

17, N

.Y.

192

VP

-P

1380

V.

P-

P

435

V.

P -

P

135

V.

P -

P

240

V.

P -P

130

VP

-P

\0 o

al HO

ER

T1-110

R3

IS

LISCu

.5-3/414 1.0

1-00M

IXE

RT

ES

T R

EC

OP

Y

V2

we

MIT

ER

-OS

[

1.'T

I2

(ITO

Wit

4WV

ELE

CT

RO

NIC

J. ,2T

EC

HN

ICIA

NLIA

}L}C

IRC

UIT

DIG

ES

T

MO

TO

RO

LAT

V C

hassis PT

S546,Y

Model 21 R

IB, B

R, G

Y; Y

21P1B

, BR

, GY

R/ 410

NO

TE

S:VO

LTA

GE

ME

AS

UR

EM

EN

TS

1.T

aken from point indicated to chassis w

ith a VT

VM

. -HO

B.

2.Line voltage m

aintained at 120V A

C.

3.V

oltages indicated by an asterisk will vary w

ith associatedcontrol settings.

4.T

aken with contrast control at m

inimum

and all othercontrols in norm

al operating position with no signal input.

5.T

uner on channel 13 or channel of least noise with

antenna terminals shorted.

WA

VE

FO

RM

ME

AS

UR

EM

EN

TS

1.T

aken from point indicated to chassis w

ith a wide -band

oscilloscope.2.

Oscilloscope synced near sw

eep -rate indicated.3.

Taken w

ith strong signal; contrast control at maxim

um;

all other controls in normal operating position.

MO

NO

PO

LE

BE

ZE

L

AN

T IS

OLA

TIO

NR

ES

PLA

CE

ME

NT

NW

B.

T501 C

ON

N

r't 'V

6V

I)n6

011V

OV

IV

1V

IIt

30114V

W[IT

61-

34

13

IIIS

4E

54 p

54

5V P

P M

AX

IMU

M

Ls

A

IC'. U

to1

L181

1191

L20

121A

0

143.3

110.(a.

RI

1102A

3816III V

IDE

O II

Ill If

SC

RE

EN

...7,R

EC

P1

V1

3826

?ND

VID

EO

IF

RIO

/IT

VID

EO

3RD

VIT

RO

IFT

ES

T (W

EP

T

TO

TE

ST

RE

CE

PT

Septem

ber 1958

WI

VI3

3CO

R

AU

DIO

IF

0.2

111

1_ _J

I"' :11:1

7301tt

316

3016

AU

DIO

DE

T

SO

UN

D

Bl-B

CIE

I':L.

_

4713

1I

2

11.3 CN

N1'1./

R)M

.'InC

31101

EV

E C

OIN

rl7'42

V5

IBA

380 VID

EO

IFT

I® C

ON

Nfour vie,

EM

I

010(0 Da

TE

ST

RE

CE

PT

LIM

0C

I21 (74.

016

015

SA

CS

AU

DIO

OU

T

Tat

elllq

I20v,, PP

Ye,

04

1803 V78

101 380/1

1ST

CLIP

PE

R

SY

NC

3

=B

.

0315 470

1,1/;94

owl-4

N.

112,6[41/N

D C

LIPP

ER

.CA

0_5010_47

C 502

IF AIX

SE

RV

ICE

TM

RE

CE

DE

IN P

P

HO

RIZ

SW

EE

P a H

.V.

(CU

T

HO

R1Z

050

OW

E

051

1600 PP

VIO

71E06

.171/ ouT

VII

14ALT

IGIA

DA

MP

ER

1501

8511

_

VIE

3A3/144.0I

HV

Rat

R520 22%

'P

OW

ER

SU

PP

LY

vil21041.4

P IM

RE

TU

BE

rT

T -110 T

UN

ER

\I

An E


LEC

TR

ON

IC T

EC

HN

ICIA

N, IN

C.* 480 Lexington A

ve., New

York 17, N

.Y.

100I

VY

132-6C67

SO

RT

ER

R

060611.015

VE

RT

SW

EE

P

0601 220

CS

IOH

.D2

V16

9E5

OR

7E36

VE

RT

OU

T

8613 330W

IV

_I1

1.6TV

PP

YO

KE

'

JL

3.514,v PP

1103

NO

R 12

021 3081Iln

161106V

ER

T LIN

1

More D

ata on Reverse S

ide

P

VE

RT

DR

YO

KE

31110Till.

Electronic T

echnician

CIR

CU

IT444D

IGE

ST

In This

Issu

e (N

o. 7

3)C

ircui

t Dig

est N

o.

AD

MIR

AL

439

TV

Cha

ssis

208

6C, T

; 20U

B6C

, TM

odel

s C

H21

H32

, 33,

34,

41,

43,

44

CH

21U

H32

, 33,

34,

41,

43,

44

LH21

H22

, 23,

24,

32,

35

LH21

UH

22, 2

3, 2

4, 3

2, 3

5T

H21

H22

, 23;

TH

21U

H22

, 23

GE

NE

RA

L E

LEC

TR

IC (

Can

ada)

..

443

Tra

nsis

tor

Rad

io P

750A

MO

NT

GO

ME

RY

WA

RD

..

..

441

Hi F

i AM

-F

M R

adio

Pho

noM

odel

GE

N 2

645A

, B, C

; GE

N 2

646A

, B, C

Ser

ial N

o. 7

5X

MO

TO

RO

LA44

4T

V C

hass

is P

TS

546,

YM

odel

21P

1B, B

R, G

Y; Y

21P

1B, B

R, G

Y

ELE

CT

RO

NIC

TE

CH

NIC

IAN

CIR

CU

IT D

IGE

ST

SP

AC

KA

RD

-BE

LL44

0T

V C

hass

is 9

8D4

Mod

els

21D

C9,

10;

24D

C5

RC

A44

2T

V C

hass

is K

CS

122A

, B, C

, D, E

, F, H

,K

, L, M

, N, P

, R, A

D, A

EM

odel

s 21

-T-9

132-

5-7

&U

;21

-T-9

152-

5-6-

7 &

U;

21-T

-921

5-6-

7 &

U;

21-T

-922

5-6-

7 &

U;

21-T

-923

5-6-

7-8

&U

;21

-T-9

255-

6-7-

8 &

U;

21-T

-931

5-6-

7-8

&U

;21

-T-9

355-

6-7

&U

;21

-T-9

396-

7-9

&U

;21

-1-9

415-

7 &

U

Sep

tem

ber

195

8

BE

ZE

L

NN

CABINET

REMOVAL.

ST

EP

8 N

TW

O S

CR

EW

S `

ON

E O

N E

AC

H S

IDE

TO

RE

MO

VE

TH

E C

AB

INE

T

Follo

w th

e di

sman

tling

ste

ps s

how

n.U

pon

com

plet

ion

ofth

ese

step

s,po

sitio

n th

e re

ceiv

er w

ith th

e pi

ctur

esc

reen

dow

n us

ing

a pr

otec

tive

pad

to-

-el

imin

ate

scra

tchi

ng o

ft h

e sc

r ee

n. T

hen

lift t

he

TV

Cha

ssis

PT

S54

6, Y

Mod

el 2

1P1B

, BR

, GY

;Y

21P

1B, B

R, G

Y

ST

EP

5

KN

OB

S

MO

TO

RO

LAT

V C

hass

is P

TS

S46

,Y

Ele

ctro

nic

Tec

hnic

ian

CIR

CU

IT D

IGE

ST

444

ST

EP

9

cabi

net (

wra

p -a

roun

d) u

pt-

(2/ B

UM

PE

RS

and

off

of th

e ch

assi

s an

d be

zel.

ST

EP

4

WE

DG

E

CLA

MP

S

Mor

e D

ata

on R

ever

se S

ide

ST

EP

10

CA

BIN

ET

To

repl

ace

cabi

net w

rap

-aro

und,

fol

low

the

dism

antli

ngst

eps

inre

vers

e or

der.

NO

TE

: Do

not t

ight

en g

roun

ding

rod

or

othe

ras

sem

bly

part

sto

the

exte

ntof

dam

age

to th

e fi

berg

lass

cabi

net.

ST

EP

2

RT

A00

5143

2-8

SC

RE

WS

Mor

e D

ata

on R

ever

se S

ide

w -J V-

0 zcc

DIA

L L

IGH

T, N

EO

NB

UL

B N

E 4

-51

* 65

K 7

4683

5

UH

F T

UN

ER

UH

FM

OD

ELS

ON

LY

1ST

IF S

CR

EE

N3R

D IF

TE

ST

RE

CE

PT

TE

ST R

EC

EPT

off

1ST

IFSC

RE

EN

,oe

VID

EO

DE

T.

TPO

INT

VID

EPL

OU

GD

-EIN

XT

AL

*4

TE

ST R

EC

EPT

K74

7 3

8u

ST

AR

T R

ES

TR

ING

ING

WIT

H L

AR

GE

UH

F P

ULL

EY

IN M

AX

CO

UN

TE

RC

LO

CK

WIS

E P

OSI

TIO

N (

AS

VIE

WE

D F

RO

M F

RO

NT

OF

TU

NE

R).

4-1/

2 T

UR

NS op

cro*

-O

N P

ULL

EY

*'41

40?"

-4#

CO

RD

CLA

MP

410°

1-2-1/2 TURNS

UHF TUNER DRIVE STRINGING.

FIL P

OIN

T6

AU

DIO

IF

314

465

1.3/

4 A

MP

8+

FU

SE

129YTA

SLO

-BLO

LC

TY

PE

VID

EO

AM

P65

K74

6971

*

PLU

G-I

NS

ILIC

ON

I RE

CT

IFIE

R48

0743

273

OR

EO

UI V

BLU

FO

CU

S L

EA

DT

O F

OC

US

AD

JUS

T

2011

10 W

AU

DIO

DE

T ,T

UB

ES

EN

TR

Y

BUS

AG

C N

OIS

E G

AT

Ea

1ST

CLI

PP

ER

9EF6/TEY6vvvr

2ND

CLI

PP

tRV

ER

TO

UT

PUT

a V

ER

OS

C

27

45

B+

+ G

ND

BO

OT

STR

AP

0_1

_-

_At

AC

SW

ITC

H*

i im.R

-FO

cus

AD

J

6C GT

HORIZ OSC

DE

FL

YO

KE

RE

CE

PT

HO

RIZ

MO

TO

RO

LAT

V C

hass

is P

TS

546,

Y

Ele

ctro

nic

Tec

hnic

ian

CIR

CU

IT D

IGE

ST

444

11-1

/2T

UR

NS

2-1/

2T

UR

NS

SP

KR

CO

NN

A05

AU

DIO

OU

TP

UT

3

9AU4 CITA

8

21EX6

IOR

IZA

M

3A3/

144A

01

HO

RIZ

'RA

SE D

ET

OSC

b1I

-)E

488

7426

98C

OIL

I*

MO

TO

RO

LA

PA

RT

NO

.

IAA

PO

WE

RIN

TE

RLO

CK

00

VE

RT

SIZ

EV

ER

T L

IN

IF A

GC

HO

RIZ

AF

CH

OR

IZ O

SC

CO

ILN

D0

B+

+H

OR

IZ H

OLD

OP

HO

RIZ

SIZ

E

FOC

US

AD

JUST

ME

NT

:P

LUG

PIC

TU

RE

TU

BE

BLU

E

LEA

D T

O B

++

, BO

OT

ST

RA

P O

R G

RO

UN

D F

OR

BE

ST

FO

CU

S.

PLU

GS

LO

CA

TE

D A

BO

VE

VE

RT

ICA

L S

IZE

CO

NT

RO

L.

8,2

TUBE LOCATION, FUSE GUIDE,

FOCUS INFORMATION & FILAMENT WIRING.

VO

CI,

O(5

5t:+

7 -

818

21)1

1 In ll8

TT

-11

0Y r

oxxx

8C11

811A

TIC

It

Cop

yrig

ht 1

958

by E

LEC

TR

ON

IC T

EC

HN

ICIA

N, I

NC

.48

0 Le

xing

ton

Ave

., N

ew Y

ork

17, N

.Y.

An

Edi

toria

l Ser

vice

of E

LEC

TR

ON

IC T

EC

HN

ICIA

N, I

NC

. * 4

80 L

exin

gton

Ave

., N

ew Y

ork

17, N

.Y.

00

oX

=

41.25 MC

MA

RK

ER

(NA

Y N

OT

BE

VIS

IBLE

)A

T LE

AS

T 90%

42.014CM

AR

KE

R

40%

-4 5 MC

AP

PR

OX

. 3.6NC

43.5NC

MA

RK

ER

A

47.25MC

MA

RK

ER

45.75 MC

iCA

WE

R

50% T

O 60%

AS

O M

C

MA

RK

ER

30%

C128

30c1-

VH

F T

UN

ER

V102

V101

Ideal Overall

IF R

esponse Curve.

L5,291_ _ _

JI

03231000

820V

202

F

*26 WIR

E P

US

T5O

triiL_

GR

EE

N

1040CREEN

5V3

RE

CT

IFIE

RV

501

IR

ED

IRE

D- T

EL.

RE

D

IC

324820

IC

,325820

I--- C326

I

820

eM

ON

TE

L.

15840TE

L.

401D

M503

TU

NIN

GLIG

HT

#47

PR

INT

ED

WIR

ING

BO

AR

D 47185-2

1-1/26AW

8A6D

T6

SO

UN

D IF

AM

PS

OU

ND

DE

T.

v 304E3

4.510V

201

Isr

r1509

0

8221581

R202

1001

C203

,

1000(

IIII

L2014 ,0204

II -825%

L2018 I

C202

I

-

4.51

L.._5%

C205

01111

6800

- -1(1-006

18206- .00470F

5601R

204

8.21L

Septem

ber 1958

R205

5604

C201

I 10001'

r01'

0210

.01 MF

4.51C

J..19/M

1r

I208

1

8203

ri,r, II L202

Ir

TsI*1

r

TO

BO

OS

T JC

T.

1420i0464 I 0433

1208

5600

TV

/HO

MO

52011

R209

564

101141101 TH

OM

8911411f 411 ON

110209C

ON

INO

IS /IN

CIT

ES

,To 11 IIF

-J

I t /SO

Y

1001C

IOC

IFS

E IO

TA

!/ON

- Of

/NO

041/1100 SE

TIM

IC

ELE

CT

RO

NIC

TE

CH

NIC

IAN439

CIR

CU

IT D

IGE

ST

CO

MP

ON

EN

TS

1/411191001110

336

C213

.0111f

6AV

64216

Ir

SO

UN

D A

MP

.140

0215 V202

.021Fy

C2i6-

1121r50

3 NE

C

VO

LUM

E

AN

D 5501

8213

I NE

C

ON

10/15/01- 01 00410.

4223684

8222390

cm 1.1 N

EC

5%

.047NC0218

.01 MF

R214

2701

300

I82176I N

EC

TR

EB

LE

NO

P

R279 O

r

150

11216

4701

I

6

.-

0220

z01 MF

I1.414

AD

MIR

AL

TV

Chassis 20B

6C,T

2OU

B6C

,T

SLO

ES

OU

ND

OU

TP

UT

RE

D D

OT

TE

RM

INA

L

265n

RE

D7

150Y

IG

221460 1114M

mi

3504-7

/2,4Y

6AQ

5AS

OU

ND

OU

TP

UT

V203

8220 .,.C

22ID330

.. 2ON

F2I1

T504

,.--

=in'

3-13i'41.25-

MC

.

0501

L302111

42 3MC

66161S

T IF

V 301

7508

-119130141K

L3031302

C305

.W

W

2%'I.-120

C505

3-1341.05 M

C.

/1109 I901' 9N

090

NO

TE

:

I' VO

LTA

CE

SA

T T

HE

SE

PO

INT

SD

EP

EN

D O

N P

OS

ITIO

NO

f R401

PI 3

-44 TO

-404P

IN 6

92VT

O1184

14081506

A5

7 301

ISR303

650645.1

17N

C

4206505470

114092.2 N

EC

66162N

D IF

v302 1058

/SOY

T

MIN

1301

221

41.51101658

T302

6

6CB

63R

D If

V 303

1118

0312__560--

1112

I: 2° AV

330

/SO

Y1311

i13011.39

1.18

it

C3I0 I

6311i

4306

1 220It

-0307420

I

R3

10022

2204

°

C321

I.22 MF

0313820

=_

r --4 S

MC

R201

1.3

L_-__"C

31511 4.7

lilIII

C3417L-1

ioock20,

-1-4,

i.__,,,7

i,,

4215410

1' 211

IN87

11306V

IDE

O

II-- f1Fis

Cm

301;L304

16

R313

410

-4--3.56

VE

RT

.

BO

TT

OM

TO

P

43.511042.0116-N

-3.54H

OW

1/2 6AW

8AV

IDE

O A

MP

V 304 A

//Or

9

0315-

/019

100;

R330/

476

.3-

..._C329TNT

r1_- -

6R.38311

0

:fur

-41$1316: 200

5%

03191.005117

)A

TLI

1000C

ON

TR

AS

T

0C

225wIF

FI

3504

6 518

123

1--1I°KR

322L308

L _ _

319

32 K

132033121

R323

391IN

132 4

5.6K

4325:158 :

IIT

201

150N

OR

!

21 DE

P4A

US

ED

IN M

OD

ELS

:

TH

21 022, T

421423 AN

D11121424.

C32I

)1

7

22103°V

11iV

II Iv305

2

J1384

VE

RT

.

8328

R402

I

*ISO

R502

C503 I.

60003 M

F

TI

350V

11401100T

-vL 501

K.0

:==

S2016

0502AC

50 B

IL"1050I: ±350

_A

M501 M

502

HT

VO

LTS

60 CY

CLE

AC

ON

O

C501

.047 Mf

85012701

5501M

ID.0111212

10 ME

G

R401

1004A

CC84101804

04403'N

OV

476

4404

3.94

R405

108,111

C403-

.011IF

R407

.rv,"/N

EC

5%

NOISE

,5

1.6404#

V401

.0047IF

-6

NO

Y

1001'

994'

a0/401R

415*1201

R406

4.1*R

4I1-N

EC

3906

R412

566 I

4416

44I9 , 1008S

UP

ER

RA

NC

EF

IND

ER

Dl

30

VE

RT

.

50 V

60111.I

11101i

1111111111111111111

T--

30410112.

1109

111

11117

5.64IN

3405R

4183,

476 Lt 350

2701S

YN

CS

EP

.

GA

TE

D A

CC

0406

84134.1M

EC

0408.00111F

-N

W

II

5- 06,

VE

RT

. -'

1/26C

G7

VE

RT

. OS

C.

v4024

C4I3

.0011fR

420842I

44214

IS'

.002211E

IC410

C41I

-,00411.01 MF

NE

634

1019

ViE

6RT

. 717.8421

2206

Oy

R42

220

104141.047 M

F

10%1424

2001W

ER

T. H

OLD

1159

R423

56K

14254101

C

HE

RI.O

UT

PU

T

6DB

5C

OR

N #011

17006

v403no,

3-6

.001 MF

2 KV

14311469

C4I6

11

.3 MF

14261.50E

0

VE

RT

HE

IGH

T

OY

11426

-2.2 NE

C

t 100N

OP

2-7C

4118

8429560

YERT

LIM

10 Olf

3504

C221C

50110

R420 5",

AR

K

0C4171

341

290A

50350V

2n

YE

C419

47M

I11432

1111

13114334103111

1/2 6CG

7S

YN

C IN

V1008

v4028,11149

6;R

IR

04415 IR

8445040

2.1 NE

C2.2K

My

14463.31

92709 INO

M P

ITO

0

93B5-4

HO

PI/ S

YN

C D

ISC

O.

CR

401

1450 rM

f

10%1001I

0429

.00110

1451100,

R452

BE

VE

L

164

HO

RIO

.

1401H

OR

IZ

LOC

K

MX

4101

4-1( 00034(1114fC

43I7

R453

ID4 M

C-S

4S2

RO

RIE

.'

MF

11,81

6CG

7110011 O

SC

v4041519

R457

.0040

12R1451821

4101

/160690112.

6CD

6GA

MA

I/ OU

TP

UT

M405

4 in100 5

R463

0437.047 11F

11452

12R31R

461

-f-6704--

HO

ME

.9-

420n

HO

RIZ

35aT

OT

AL

7402D

EF

LEC

TIO

N Y

OK

E

1201

CO

WC

T 10 R

OW

4 .9 NC

a/CH

EW

9/109/015 MS

T 10001

nAB

.022 MIi 100, _F

tC

420

mf

laI

10v

6V

ER

T.

aI

F4401

PIN

91111O

H B

LAC

K- - - -

C322

114-61.110 - R329,3

047I

3914

1504

I!

14202RE

D D

OT

....--T

ER

MIN

AL

001

RE

D D

OT

TE

RM

INA

L

US

EC

IN M

OD

ELS

:

CH

21 432.

CH

21 033A

ND

CH

21II 34.

R467

163 CT

N.V

. RE

CT

IFIE

Rv 407

51O

n.

I4a.

2ni

14036A

U4C

IAD

AM

PE

R

XO

ST

1051

C440

1109

V406

I 04433

C412

120230

10% 214

On

!IVR

465

10 110.5

049.,8466

.041.`4101

IKV

.027MF

1.666,10%

C439

=7.047

M402

LUC

My

5

Int5

C24304I

21410%

4000611.01

NO

W .

FU

RP

A504

0401/ON

SE

E 1.491100N

04181701E

ME

AS

111/10

11501

200150

4P

HO

MO

5201C

RO

O D

OT

TE

RM

INA

L

/

RE

D D

OT

TE

RM

INA

L

RE

D 001

TE

RN

INA

L

101R

ED

DO

T

TE

RM

INA

L

1.1 204M

ID R

AN

CE

M203

WO

OF

E6

PA

205

MID

RA

NC

E

208R

ID R

AB

E

EA

206

WO

Of E

S

14207100F

ER

M209

NIO

RA

KE

US

ED

MO

DE

LS:

CH

11141. 04211143,C1421H

44,LH

11122. L1121423. LH211124,

L1121432 AN

D 1.11211135.

Electronic T

echnician

CIR

CU

ITA39

DIG

ES

T IV

An E


LEC

TR

ON

IC T

EC

HN

ICIA

N, IN

C.

480 Lexington Ave., N

ew Y

ork 17, N.Y

.M

ore Data on R

everse Side

VH

F T

UN

ER

94E

160-

2

5

1.4

804

19A

TI1

INC

HE

S

CH

AS

SIS

TO

CH

AS

SIS

UH

F

AN

TE

NN

A

E3

UH

FB

+JU

MP

ER

..

L106 3 M

101

L141

L142

A_.

----

CO

ILV

IEW

TU

NE

RS

ET

ON

CH

AIO

TE

42

L107

10

L101

3

10

11L1

2

11

13

C.1

061

11g%

I 6B

C8

-- T

HE

RE

W.

UH

F1

T IF

PR

E A

MP

VI O

t/if

/6

CIO

/

2.1

10%

^136

-`L

143

CIT

E91

0310

1:10

12

8113

8.2

A31

1 ICAO

1.5

-3.0

110Y

lf.T

Y2

5601

CH

I01

12to

9104

33R

IOS

8206

0109

12.2

II

L I

I 9 L137

LI33

C0

LI32

CI2

2

27,1

050

139

RII2

LI23

21

o L1

10

R10

1I0

00 CII4 41

7

non

LI44 10 000

CI1

6.5

610

%

9108

101

9110 ME

C

L I 3

LI 1

6

-e

AC

CE

SS

IBLE

AR

ON

fRO

II O

F C

AB

INE

T.

CI2

1 1001

-7-t

:A

0300

6.16

.1

R30

035 IC

402

I IN

FM

102

FIN

E

TU

NIN

G

3.9K

IU

HF

TU

NE

R 9

4 D

162-

1-L

80=

-Rao

,C

809;

1

k-4

6801

1ST

UH

F L

INE

2110

UH

F L

INE

-1-

L802

CR

801

L803

M B

021-

1118

2A

I"1

18I

6AF

4Ar

8802

- -

UH

F O

SC

.0

NO

V 9

V80

1

C80

21-

100

±C

803

-7

1000

111

35

RU

N

3

L804

Ci÷

:140

CN

A "

/GE

S0

Sta

r, 0

1 pr

oduc

tion

201/

867

and

2011

856.

AD

MIR

AL

TV

Cha

ssis

208

6C,T

2OU

B6C

,T

Ele

ctro

nic

Tec

hnic

ian

CIR

CU

IT D

IGE

ST

439

2-6

coos

al t; I

C80

9C I

I

OS

C. L

INE

- -

- -

C80

6C

807

0808

15_

_

4

LEO

S5.

611

7-.5

-3.0

V2y

1103

2680

5

4

HE

AT

ER

CIR

CU

IT F

US

ER

EP

LAC

E F

US

E W

IRE

WIT

H#

26 G

AU

GE

BA

RE

CO

PP

ER

AN

NE

ALE

D W

IRE

-1"

LO

NG

6.3V

LE

AD

FR

OM

XF

MR

Hea

ter

Circ

uit F

use

Loca

tion.

Mor

e D

ata

on R

ever

se S

ide

KN

OB

S

"VR504

°MY

2.24

,3V

%W

Cur

I

R50

595

0610

0041

00vw

I.A

4fr

4W

C40

1

1.22

83

RS

OT

8200

39

E'

VH

F C

HA

NN

EL

AD

JUS

TM

EN

T A

CC

ES

SIB

LET

HR

OU

GH

HO

LE IN

TU

NE

R.

Fro

nt V

iew

of E

scut

cheo

n,T

unin

g K

nobs

Rem

oved

.

Vie

w S

how

ing

Dis

asse

mbl

y of

Fro

nt E

scut

cheo

nan

d A

ssoc

iate

d P

arts

on

2086

C, 2

0B6T

, 2O

UB

6Can

d 2O

UB

6T C

hass

is.

RE

TA

ININ

G:"

ST

UD

,' /./

/T

OP

TR

IM S

TR

IP/R

ET

AIN

ING

ST

UD

HO

LES

mss

poT

OP

TR

IM S

TR

IPK

NO

BS

(se7

;-ar

)

PR

OP

6R P

OS

ITIO

NIN

GO

F H

AN

DS

FO

R/ R

EM

OV

ING

BO

TT

OM

TR

IM S

TR

IP

BO

TT

OM

TR

IM S

TR

IFI

DO

C:r

E7O

rG

LAS

S,

RE

TA

ININ

G P

LAT

ER

ET

AI

1/0/

6 P

LAT

E 7

, '17

(BO

TT

OM

)(

SP

RIN

GS

``'%

?kss

,

6'

TO

P F

LAN

GE

TR

IM S

TR

IPE

XT

EN

SIO

N S

LOT

S

RE

TA

ININ

G P

LAT

ES

CR

EW

S

PR

OJE

CT

ION

S

5-1

S-7

OS

C S

LUG

S V -

2I5-

2

V-1

6

FO

CU

S

T-3 V

-18

INT

LK,

T-5

RE

MO

TE

CO

NT

RO

LC

AB

LE S

KIS L_

f;

3 BA

CA

-P

24.0

/VT

M4,

247

HE

IGH

T

VT

LIN

5-8

5-9

V -

I0

CN

TS

T

ICS

5

PIC

TU

RE

FID

ELI

TY

5-10

5-11

TO

NE

JH

Z H

OLD

AG

CA

NI 0

62/v

4

5-13 5-

12 "

5-3

V-1

---

5-4 2

5-15

S-5

V-9

V-3

V-1

3V

-14

HZ

DR

IVE

V-1

7

VT

HO

LD

V-1

2

V-1

1

V-4

SP

KR

SK

T

T-1

54Ii

C)

Tun

er 1

0593

0

,54.

070.

8 .4

016-

2iP

S25

.9/7

0/4

1 18

24/2

055

/F/6

.4,1

1/2.

166-

3?0,

679

5/?,

on.4

80.4

,7,1

,-04

rar

jakE

r

5.4,

70a

.560

55

6066

I

.96

020`

T0

ec2,

2114

/,66

.9'

E C

OO

5-4

0

ITE

M N

O4/

2504

4/A

ttr6g

6,

1A

.007

Et

R.,

TE

5r3

15 6

/581

14

HE

A7-

24?

.5-

1.57

AD

JUS

T:

6/A

; 7-2

7et1

//Y44

27

.4*-

TR

/Ff.

81.

11,2

47 M

/71

9F

INE

TV

A/N

&/0

AN

TE

NN

A.

//52

.0/2

5 A

0/05

r/2

8,52

TA

P4

/100

25.

/5"s

ou/V

T/M

a C

42.4

.444

/V2,

/4O

SC

. SLG

IC A

DJU

ST

/3-

.9.2

609

/6A

CG

A-5

1T

O A

ihrE

RG

ifY0

C/I

30 N

PO

C /3

e5L1

±1)

6/75

/N,5

7 ,9/9

C/3

-S

oo, 2.

5514

9

of

TUNING

z..z

2L6

fNSO

AC ON-O'T

,zsc

ay_4

42(.

..coo

rzso

i.

0/4

0/7

11-

6.3

8.4

HE

AT

ER

chec

rwr

L 0

6504

0831

533.

3,52

.50.

4- 9

FR

ON

Tre

,a0/

vr 4

./A1

-E4?

PA

CK

AR

D-B

ELL

TV

Cha

ssis

98D

4

Ele

ctro

nic

Tec

hnic

ian

CIR

CU

IT D

IGE

ST

440

CW

,B

AC

KLL

4C,II

VA

FE

R

1

6604

0

(MA

LE)

7764

Co

7/4

:4. 6

6 04

/(1

-1.4

05)

Rem

ote

Con

trol

RM

-201

851/

4-

C77

? 60

s-.4

,

tri=

liee-

rloT

e

CH

AN

NE

L /3

P05

/r/O

N../

426

Fur

444

65 5

8001

(N01

247'

2 4,

1N.4

4o 0

22-

-L1

1)-

5114

,TB

ET

A/H

ER

$1..1

f/N6

GR

OO

VE

-D

E T

A/L

.:I'

rEX

IST

/NJ

2-4'

7922

0)2

Fio

,r/c

ov

5107

/2:1

9 A

LLO

5nN

GT

e/A

/E,e

/V07

2-5,

7: -

ME

D B

Y S

TA

ND

AR

D C

O/L

CO

PA

RT

NO

71

- N

IA -

86-

DE

TE

N T

5 F

OR

/2 C

-.4e

4NN

EL

53.

- T

OR

QU

E: k

W"'

/20

/N O

Z4

-774

/7A

:' P

AT

CA

1i4A

.0 B

ELL

PA

RT

-N

O, /

55L

/E. L

ET

TE

Rf

FiFW

:5 /L

., /Y

RR

Or O

N P

AR

T.

.1--

A7A

VE

-71/

1VIN

G J

A/E

EF

',

43 M

C /8

/1V

0/V

CH

AN

NE

L z.

-

2/./C

ON

CH

AN

NE

L /3

6- 0

3C /L

L. 9

7 -

OR

/AV

EC

r/O

NO

N A

NT

CH

AN

NE

L S

HA

LLN

OT

BE

LE -

S3

TH

AN

757

0 V

OLT

1

0A

//7 -

H F

l/VE

---

TC

/N/N

G A

DJU

ST

ED

FO

R L

ON

E -

ST

//V

./EC

T/O

N

Mor

e D

ata

on O

ppos

ite P

age

An

Edi

toria

l Ser

vice

of E

LEC

TR

ON

IC T

EC

HN

ICIA

N, I

NC

. * 4

80 L

exin

gton

Ave

., N

ew Y

ork

17, N

.Y.

k / /24X7

Tr1

kWh-- T

UN

ER

'>

57- 50UN

D /b. -

I103-930

4I

r `,r') V

2/ Ics /5- j_

i117%

NPO

--I

1.406C

-66I1

4.5/1.C.

68N4

71

45:00 NC

IL

_4.8.C

.1..+

-- 5/jI- -

1- -*- - - -_i_ /-,

11

IC/

Tar

,,,i.

-÷--

4zsatl Z sz

V2

6AU

6eN

D S

OU

ND

IF

Septem

ber 1958

V3A

/68N8

SO

UN

D D

E -7:

ELE

CT

RO

NIC

TE

CH

NIC

IAN440

CIR

CU

ITD

IGE

STV

35 z 6BN

815T

AU

DIO

Y4 61/66T

AU

DIO

04/77?

.4166005%71V

.2771,

C7/

.0/600i/

20 ./

575L2

//S y. 4.50

R3

C68

/0K

c7147

-A

PO

II15413,

T2°"'

G4

/92'''`A

0C

6_(00K

//PO5%

/059./77

77 /1-A"

LS flP,i

P5081

/00K/O

K

R6/PO

C/0

.4,*"

C9

/90/0%

AR8

3300

156TI I

311

-9.6 v_T

o-6c

Z..C

/3

PA

CK

AR

D - B

ELL

TV

Chassis 98D

4M

odels 21DC

9, 10; 24DC

5

200V0//

i 0/2/200

OK

C/L

i.

7/

-0.sv

ices.-eeN

lv

ts 47.2571CC

V/V

W =

C26

/0K

VS

6.5 Z6

15TI.F/27 V

0./ VC

20-2.24300

L6 30J

39.75/V

C56

C27

IR82

3300'/20

V6 65Z

62N

DIF

V

F30/00

264 e

532C

53

C3/

R.5

24-70A

-

I/98 2 6A,184

io%l/// A

2 6A/V

8D

ELA

YA

.G.C

.

R520

R3:3

22/7390K

/0%/0%

7

St VT

1250 1/7-

.e29vV

v`3300

V/2/4

26.5W5'

SY

NC

. SE

R

5/0.50/fC

4/25/94

/20

V7 68Z

6..5R

D

2

0.98-/.0/4".0

.932100V

P3/.4/5/9

AG

C

er

2/20 V

83456

V//5 Z

6,4N8

SY

NC

. AM

/'

C40

5*, 1

5/245.75/1.0.

9

L/0

-26 v

220 V.

C52470/K

w

Res

24. rr V/08 /60X

822A

-

C72

P55

.003368K

600V/07..

"Pe62.2/7

/0%

L/E

7F'7.- 05C.

-4(89..- 73 68/C.0022

/4.5w400i/

5

/0%_402

C74

470

R55

R5

4762701/0%

49/276C

75.0476.00v

/96' 73M

890877 e.

VniF'7,4/0,0 331' /0 %

1053070

7

a

C54

/OK

ta

650 HZ

R'93

4.7oV

.P 92.033

8,.r5/1

600Y2

1/E/6/17"

C76

.93-V/50/2/0%

V/6 6675

VE

RT

. OLI T

P

6004/1-77A

=94

oo/0.

T040.

More D

ata on Opposite P

age

-/7

.eee/. 5/7

cs-e267

/BO

O **7-

-93V0

R60

102

T3

7o V

079.018 -/000v

/0%

I C56

/500/7633300

6'

/265/001(

V.

0576.7

R3

C39

IK20 V.

0411

/80R

36

/AT

R/4

/8

1R/3

4.WA

./5T

ON

ESO

O1C

/8

/00V

C/9

.ore400VR

ib4V

.6

1020./

VR

/7 6002201'

275e.022-1.- 0047 '

600,,a6

er,/7:77067.0,75/./0

CW

,PY/Y

EZ

5.4ZE

C7A

PO

N /1072R

FRO

NT

454CA

'

J/8464,18A

1/884T

H /F

DE

TE

CT

OR

1/2 V.

415.30r/415/4.L

'/.3L

/27

/00Is

C4.5

t L/40,

CR

3745

1/210A

4/0.94

51;/v/.0

R.3.9

R38

560

V94 z 64,78/1V

/OC

O417/1-Z

.r

55 7,

II

133100

1

L046

A'

"a.0TR

047

L/61;1.

TO

A'

Z.

ezoz6cre

A.4/

,eo0V

/DE

O D

ore:87

rL17 I

r---r~"'

- ithL___I

6

/e7,.M

YC

330

P/XFID

ITY

rk

0999 4:_ 20,4/70...350ie

6.2

/50O

26 HZ

22 HZ

/5112

1//25 2 6.6N6

AFC

C 5-8

5K.468

90 HZ

1/13 6067H

ZO

SC:...,-

230 v.R

7/18./f.72

/50K0-64

'Opt

6.'004

/01:.60

r/ 0 r

'--2- 6/

Al.C

../46

gf,5-1.-,880 r/0-

-_,...7leef7

9/ 060L

/9 -n N

AV

5/6

/50 NZ

30.8K

C63

HO

R/Z

IOW

S/E.25

/00KR

705%

R75

6800

R30

/004'

1//81/2AX

4/11/.

IRre

33K

Retct

843-/00

RIP

-4/8/F4639007"/

R49

62K

V/9

2/CE

P4

24 -Al -/P

4

0506000RS

O2206

1

S

3000FO

CU

S .4.,v-/0/6/ 5%

/25/R

8/3y

S22/4

VA

L 6 C

Z26

6,4V

/5 /63/-7/0/F

/Z.O

UT

4' H.V

/PE

C-

068./

200i/

iC66

C67

/OK

--IDA

'

2-69./000%

.979 .96,/2Ktoil

6R

az

v2.2 53;

//v

R33

//4070a6

030 6000.0/rf

ZZ

O/20

6

220

2002.5231V

,

W7 6414

PAM

PER

5

L 2/

ION

V/8 5V

3Z

.le PE

-Cr

,C

9982:9 9_C63.4

P/00----M

0/9CD

-/002#D

470

1

350"350W

Z91

R96

3/9oe97

W792-L

/A4

0/4".

/00/ICD

+ c2Z

1.93506/

69e5/.02-14/A

L/E

-POR

A4

/5 6/1/EN

P9( TO

RK

VO

LT

A 6 E

6 JAY

E' 5R

FRE

08/4r/VC

y (VT

OT

He)

6

7-4

6.37;3

775C

95

C94

60ay

0Z

OO047o

re")

C36

V7

R/02

,I31(

0

R/0/

27

L.6800,

7w.

Cel7

42001./

0/V 50422 3873

To .re.otice P//orN

175729.)

Model 21D

C9

Electronic

Technician

CIR

CU

ITD

IGE

ST440

An E


LEC

TR

ON

IC T

EC

HN

ICIA

N, IN

C. 7"T

480 Lexington Ave., N

ew Y

ork 17, N.Y

.

ELE

CT

RO

NIC

TE

CH

NIC

IAN

441

CIR

CU

IT D

IGE

ST

r

Sep

tem

ber

195

8

GE

N 2

645A

, B, C

MA

HO

GA

NY

GE

N 2

646A

,B,C

FR

UIT

WO

OD

FR

OM

Au0

10O

UT

PU

T

TI

r

C24

C25

100

50w

un,

him

FD

020

L 1

0

cv.1

_2,

MO

NT

GO

ME

RY

WA

RD

Hi F

i AM

-F

M R

adio

Pho

noM

odel

GE

N 2

645A

, B, C

; GE

N 2

646A

, B, C

Ser

ial N

o. 7

5X CI

01 ME

D

FM

INP

UT

'ME

G

V I

6C96

`01

km"

-mp-

C2

CS

SO

W4F

D

L2C

6

R3

470A

V2

-A1/

2 12

AT

7

I -7

MM

FD

Cl

04 21 ME

G

V2

-BR

22(/

2125

17en

s,

R21

ISK

LII

iC26

INF

OL1

2

01LO

OP

INF

O

L

VI0

-A

1/2

I2A

u7*

C52

C39

0547

0M

F0

FIL

AM

F

R 3

9A

R40

A68

KC

3700

1M

FD

47K

BA

SS

R64

ON

TR

OL

I5K

C38

TW

EB

CO

NT

01

R42

MF

D15

K

I ME

GR

ai

vio-

B2

2AU

7 I I

R43

1/2

ME

G C40

M5000

R44

3 3K

YE

L

05a

VI6

RE

D5U

4 G

B

25A R

ED

S

723i

RE

D

GR

N

0.5n

.G

RN

&Y

EL

0 A G

RN

.

TO

AM

PLI

FIE

R

TU

BE

S -

6 3v

TO

RE

CH

AS

SIS

0.5.

86

3 V

LT. G

RN

TO

SW

ITC

H O

NT

RE

BLE

CO

NT

RO

L

Ele

ctro

nic

Tec

hnic

ian

CIR

CU

IT54

1D

IGE

ST

R54

!eon

L13

L

C41 01 mF

D

C30

01 'RF

D

V7

6866

120.

0R

30

R29

.6,

4700

RE

CO

ILr I

IIL1

4

--tI. 11 1

1 1

031

c

ixtTC56

I

EC

C31 35

1-,

FD T

VII

-A

L.

05 IS

V3

68A

6

L4

I °E"

I

'au-

%2:

L__

CB .0

1

I. M

ED

CIO

rL5

R7 3.30

L 0JI2

m00

- 1M

FD

74 6866

- ,

RS

15

L

R95 92

A92

6,

L6

MF

_aoc

lfel

I

CI4 I0

LIS

-1 X*

-T

4-

R23

3.31

4

R33

10K

C33 05

10F

D

)SU

PP

LY

ZM

FD

L

V5

6856

7

RI2

A

J62

8 ci

wA

MMF

L8r L

110'

1:11

(

CIS

!-;

ayo

rt,i

1_1

1

T 1

---

3K

I

L4

_.,I

RIO

6111

1.

1.01

g 0

'..^.

..--.

-a ii

g kayo

V6

GA

LS

RI4

R24 1.5K

.

24".

.,,,S

W°1

1AM

2FIA

SW

1 AR

4o3

PH

ON

O

0 T

AP

E

I AM

dAM

sw I

JEM

AU

DIO

;1, P

0000

INP

UT

4TAPE

034

4706

336

R25

686

A

`1J,

ME

D

V9

6E5

R36

IME

G

FM R

35M

EG

VII

-BV

12

1/2

)2A

U7

1/2

)2A

U7

EL8

4

R45

A47

K

R46

I ME

G

6.8

KR

47A

R4

47K

R49

t220

K

C42 05

R50

47K

-...T

OR

FS

UP

PLY

C43 05

MF

D.

R5I

470K

R52

loon

.

R53

4 47

0K

OR

AN

GE

0 03

V13

EL8

4 R57

180.

6

ri

27K

15K

R55

TM

60F

D

A

R56

40 MF

D

8

C45

TM

FD

C 5

3

40 ME

D

C46 .01

MF

D

V14

EL8

4O

RA

NG

E

R58

470K

C47

R59

1805

1--A

, A

R60

470K

01 ME

D

C48

SO

ILM

FD

v15

RE

D aY

EL 82

A8

ARED 82

7 fn csi

EL8

4

T2

2

SP

.1

BLU

E

BLU

EN

OT

ES

E*

TH

IS T

UB

E IS

ON

AM

-F

M T

UN

ER

CH

AS

SIS

C31

1_05 M

FD

0A

M

swI

FIL

6V0

0

VO

LTA

GE

CH

AR

T

RI6

RI6

6.8K

+La

w 2

MF

D01

9-

C36

6 O

K

017

1500

5

115

C35

01

IWO

NO

TE

X T

ES

T P

OIN

TIF

PA

RT

OF

OS

CIL

L C

OIL

SW

ITC

H C

PI F

M -

R26

2.2

ME

G

R27

ME

G

ITI*

TU

NE

PIN

IPI

P 2

PIP

.1PI

N 4

PIN

5PI

N I

fPI

N 7

PIN

.PI

N

VI

6C06

-.6

00

6. S

AC

1110

3711

070

0

142

12A

77H

207

4 m

cA

MC

125

-1.2

50

V3

1111

560

00

6. S

AC

110

10

13

VA

6115

60

00

6.31

0.1

10 3

0 1

. 25

VS

6115

I0

00

6. S

AC

*100

100

1.3

5V

SS

AC

S77

56.

310

0 1

.25

aV

761

116

00

0&

SA

C.1

65+

HO

1.3

5

a70

68E

6-6

.00

06.

SA

C+

ZO

O10

00

716E

30

1115

0/S

AC

044

3AC

0V

IOI2

AU

770

0.2

*.S

AC

4.3A

C 0

50

4I

JA

C0

VII

12A

1.17

.70

0.1

.36S

AC

6.34

C08

310

75

/SA

C

071

101

.114

/680

5M

C0

.10

&JA

C6.

3AC

MC

260

MC

265

071

301

.04

/680

5M

C0

.10

6.3A

C6.

3AC

MC

260

MC

265

o71

4E

L114

/680

5M

C0

.10

6.3A

C6.

3AC

NC

360

MC

MS

0V

ISE

LSA

/ 60

05N

C0

10

6. lA

C6.

3AC

SC

.210

MC

265

071

6S

UA

-811

042

030

BO

AC

0M

AC

0+

3115

Mea

sure

d in

FM

-A

FC

Pos

ition

0 M

easu

red

in P

hono

Pos

ition

Mea

sure

d in

AM

Pos

ition

All

Mea

sure

men

ts m

ode

with

V.T

.V.M

.A

ll M

easu

rem

ents

with

no

sign

al.

C 0T

UN

ING

GA

NG

FU

LLY

OP

EN

ED

2 T

UR

NS

DIA

L C

OR

D S

TR

ING

ING

An

Edi

toria

l Ser

vice

of E

LEC

TR

ON

IC T

EC

HN

ICIA

N, I

NC

.48

0 Le

xing

ton

Ave

., N

ew Y

ork

17, N

.Y.

BUSS FUSES help you avoidadjustments and call-backs.

Faulty fuses can cause troublefor you and your customers byWing to protect - or by blowingneedlessly . . . but, with BUSS fusesyou can be sure of dependable pro-tection under all service conditions.

Every BUSS fuse you sell or in-stall is tested in a sensitive elec-tronic device. Any fuse not correctlycalibrated, properly constructed andright in all physical dimensions isautomatically rejected.

That's why BUSS fuses providemaximum protection against dam-age due to electrical faults. Usersare safeguarded against unneces-sary repair bills, - and yourreputation for quality and serviceis Protected.

Equally important, BUSS fuseseliminate needless blows that irri-tate users and require adjustmentsor call-backs on the part of salesand service organizations.

Protect yourself against faultyfuses causing trouble by relying onBUSS fuses. To meet service needs,there is a complete line of BUSSfuses available.

For more information on the com-plete line of BUSS and FUSETRONSmall Dimension Fuses and Fuse-holders . . . Write for bulletin SFB.Bussmann Mfg. Division McGraw -Edison Co. University at Jefferson,St. Louis 7, Mo.

BUSS fuses are made to protect-not to blow, needlessly TRUSTWORTHY MANES INIILICTRICAt ROTSQTIOH

BUSS

BUSS MAKES A COM-PLETE LINE OF FUSESFOR HOME, FARM, COM-MERCIAL. ELECTRONIC.AUTOMOTIVE AND IN-DUSTRIAL USE.

958

...for the CA-6AU4-GTA

A "diagnosis" of the RCA-6AU4-GTA shows why it gives topperformance for extended hours of operation.

Tube life is increased through improved heat dissipation, achieved withan increased bulb area, new plate shape, and the use of special"clad" plate material. Early -hour failure is minimized by elaborateprecautions against internal contamination during production.Borderline tubes are eliminated through emission testsat extremely low heater voltage, and by aging and life testsat increased plate dissipation. The result is a tube with anunusual ability to resist plate -to -cathode arcing andinternal breakdowns.RCA-6AU4-GTA-preferred for TV damper circuits byoriginal equipment designers-is a tube you can rely upon forreplacement purposes. Do the same as all experienced TVtechnicians do, always ask your RCA Tube Distributorfor RCA tubes!

(iliel RADIO CORPORATION OF AMERICAalk Electron Tube Division

®Harrison, N. J.

r --

Speed Up and Simplify YourColor -TV Servicing With

R:A's New PICT -O -GUIDEIt's chock -full -of practical informa-tior and illustrations --just what youneed for profitable color -TV servicing.

A-ailable through your RCA TubeDistributor or send check or

money order for $4.50 payableto Radio Corporation of Amer-ica, to RCA Commercial Engi-

neering, 415 South 5th St.,Harrison, New Jersey.

TECH N I - World Radio History

Documents

Transcript of TECH N I - World Radio History