Rider-1938-DEF.pdf - World Radio History

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DETROLA PAGE 8-1

DETROLA RADIO CORP.

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John F. Rider, Publisher


2 DETROLA

MODEL 117B Schematic,Sockot

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ON-OFF SWITCH SELECTOR

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DETROLA PAGE 8-3

STATION SELECTOR BAND SELECTOR VOLUME CONTROL

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4 DETROLA

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DN:THOI.A PAGE 8-5

DETROLA RADIO CORP.

I. F. Alignment The I.F. frequency of this receiver is 456 K.C.

For realignment, use the following procedure. It is necessary to use an accurately calibrated signal

generator. Couple the signal generator to the grid of the 6A7 tube with a tenth microfarad condenser in series with the "high" lead of the signal generator. Connect the ground side of the signal generator to the chassis. Set the signal generator to 456 K.C. Be sure the wave switch of the set is in the broadcast position and the volume control set at maximum. Attenuate the signal generator so that the signal is just audible in the speaker. If an output meter is used, it should be connected across the voice coil terminals of the speaker. Use % volt as standard output.

Adjust the 2nd I.F. transformer first. Each screw should be adjusted for maximum output. After number two I.F. has been adjusted, number one I.F. should be adjusted .for maximum output. After both transformers have been adjusted, it is necessary to recheck No. 2 transformer and then recheck No. 1.

See TUBE LAYOUT for location of I.F. and R.F. trimmers and padder.

R. F. Alignment

MODELS 136,149,149E Schematic, Socket

Trimmers,Alignment

volume control to maximum. Turn the station selector to the highest frequency (as far as it will go) .

Set the signal generator to 1720 K.C. Adjust the oscillator trimmer until the signal is heard. After the oscillator has been set at 1720 K.C., turn the station selector to 1400 K.C. Set the signal generator to 1400 K.C. When the signal is heard, adjust the first detector trimmer for maximum output.

When the set has been adjusted at 1400 K.C., turn the station selector dial to 600 K.C. Set the signal generator to 600 K.C. When the signal is heard, adjust the padder condenser by rocking the selector back and forth. While adjusting the padder screw, it is necessary to move the selector so that the signal may be kept in tune while adjusting the padder screw. This procedure should be followed until maximum output is obtained.

The foregoing procedure should be repeated. That is, the set is to be rechecked at 1720, 1400 and 600 K.C.

When aligning the R.F., use the same output standard as was used on the I.F. alignment.

Short Wave Alignment Turn the band selector switch of the set to short

To align the broadcast band, proceed as follows: wave. Set the signal generator to 6000 K.C. Connect First, connect the ground side of the signal gen- a 400 ohm resistor in series with the .00025 condenser.

erator to the chassis. Connect the high side of the Tune the set until the signal is heard. If two signals signal generator with a .00025 condenser, in series, are heard, always align to the highest frequency heard to the antenna lead of the set. Make sure the band on the receiver. Adjust the small trimmer on the switch of the set is in the broadcast position. Set the antenna coil for maximum output.

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6 DETROLA

MODEL 137 Schematic, Socket

Parte DETROLA RADIO CORP.

Cl, C2 .005 - 600 v.

C3 180 mmf. trimmer

C4, C5, C6, C7, 1 - 10 mmf. trimmer

C8 350 mmf. padder

C9 .02 - 600

C10 1150 mmf. mica

C11,C12.05-200

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IF 456 KC

MODEL 13'

No.3335

PARTS LIST - MODEL 137

C17, C18, C19, C20 R4, R5, R6 1 meg. 1/3 w. 100 - 125 trimmer

C21 50 mmf. mica

C22 250 mmf. mica

C23, C24 .01 - 600 v.

C25 16 mfd. 150 v.

C26 24 mfd. 150 v.

C27, C28 variable air

R1, R2, 50M 1/3 w.

R3 20M 1/3 w.

STATION SELECTOR BAND SELECTOR VOLUME CONTROL

ANTENNA

POWER CORDD

R7 500M volume control and switch

R8 500M 1/3 w.

R9 200M 1/3 w.

RIO 300M 1/3 w.

R11 20 ohms. 1/2 w.

R12 100 ohms. 1/3 w.

Tubes required are: 1-6A7 Oscillator -Translator 1-6D6 Intermediate Frequency Amplifier 1- 75 Detector -Automatic Volume Control

First Audio 1- 43 Power Output 1-25Z5 Rectifier 1-BK-42-D Voltage Regulator

NO GROUND IS NECESSARY-Under no con- dition should a ground wire be attached to this receiver.



DETROL,A PAGE 8-7

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BROADCAST T

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DETROLA RADIO CORP. OSe- rRANS.

6A7

INTERMEDIATE FREQUENCY 456 K.C.

PARTS LIST - MODEL 140

Cl .005 600 y. C2 180 mmf. trimmer C3, C4, C5, C6, C7,

1 to 10 mmf. trimmer C8 3 to 35 mmf. trimmer C9, C-10 350 mmf. air

variable C11 50 mmf. mica C12, C13, .05-200 v. C14 .2 200 C29 C15, C16 120 mmf. C30

trimmer C17, C18 .003 600 v. C31

C19 250 mmf. mica C32

C20 C21 C22, C25 C26 C27

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C23, C24 .1 200 v. .2200 v. .02 600 v. 16 mfd. 150 v. wet

electrolytic 24 mfd. 150 v. wet

electrolytic 3 to 35 mmf. trimmer 220 to 550 mmf.

padder 1330 mmf. padder 3850 mmf. padder

Tubes required are:

1-6A7 Oscillator -Translator 1-6D6 Intermediate Frequency Amplifier 1- 76 Detector -Automatic Volume Control 1-6C6 First Audio 1- 43 Power Output 1-25Z5 Rectifier

NO GROUND IS NECESSARY-Under no con- dition should a ground wire be attached to this receiver.

R1, R2 50M ohms R3 20M ohms R4 200 ohms R5, R6, R7, R8 I megohm R9 250M ohms R10 500M ohms R11 300M ohms R12, R13 35 ohms R14 100 ohms line cord R15 10M ohms R16 45 ohms center tapped R17 2 megohms tone control R18 500M ohms vol. control

STATION BAND SELECTOR

SELECTOR SWITCH

TONE VOLUME CONTROL

CONTROL ON OFF SWITCH

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DETROLA PAGE 8-

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DETROLA PAGE 8-11

MODEL 146

MODEL 158A MODEL 162

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12 DETROLA

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14 DETROLA

MODEL 150 Schenatic,Socket Notes

DETROLA RADIO CORP.

Tubes required are: 1- 75 1- 76

Detector A. V. C. Audio Amplifier Phase Inverter

1-6A7 Oscillator Translator 2- 43 Output 1-6D6 I. F. Amplifier 1-25Z5 Rectifier

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DETROLA PAGE 8-15

OSC - TggNS 6A7 1

Oil MICA

00M

1200 50M

606

02

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DETROLA RADIO CORP.

I mt

MA

1 6G5 ;-

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IF 456KC

SOMMF

Part No. Req. Description

3873 I Transformer-Power 3356 I Transformer -1st I.F. 3465-2 I Transformer -2nd I.F. 3874 1 Coil-Antenna 3875 1 Coil-Oscillator 3876 1 Condenser-Variable 3877 1 Condenser-Dry Elec.

388 1 Speaker

4147 Schematic Diagram 4148 Tube Sticker

530 2 Bulbs-Pilot Light 2163 I Drive Cable

2908 1 Spring-Drive Cable

2597 1 Condenser-Trimmer 1286 2 Condenser-Mica .00025 3 1 90 1 Condenser-Mica .001

3066 I Switch-Band 3883 1 Control-Tone-Switch 3361 1 Control-Volume and Switch

SOOM Of ZOr

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Part No.

624

602

2730

603

631

636

3893

3402

4145

3889

3890

3891

565

568

576

572

581

2695

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41 4-1

Tubes required are:

1-6A7 Oscillator -Translator 1-6D6 I. F. Amplifier 1- 75 Detector-A.V.C., 1- 41 Output

' 1- 84 Rectifier 1-6G5 Tuning Eye

Req. Description

1 Resistor-%W-1 Meg.

I Resistor-%W-250M 1 Resistor-%W-200M

Resistor-%W-100M I Resistor-%W-50M 1 Resistor-%W-40M I Resistor-%W-350 oms

1 Resistor -1W- 4 0 ohms Flexohm

1 Indicator

1 Gasket-Glass 1 Glass

1 Pointer

1 Condenser-Paper .01-200V 1 Condenser-Paper .01-400V 1 Condenser-Paper .02-400V 1 Condenser-Paper .1-200V 1 Condenser-Paper.005-600V 1 Condenser-Paper.003-600V

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16 DETROLA

MODEL 155X Schematio,Parte DETROLA RADIO CORP.

Ca I6MC

Cs I6MC

Ce IBIMC

C9 e 600 KC

Tubes required are: 1-6K7 Radio frequency amplifier 1-6A7 Oscillator-translator 1-6K7 Intermediate frequency amplifier 1-6H6 Detector-automatic volume control 1-6C5 First audio amplifier

r

L

Tubes 1 6G5 Cathode ray tuning tube (on models

equipped with "eye" tuning indicator) 1-76 Driver 1-76 Driver -phase inverter 2-42 Power output 1-80 Rectifier

O A

6K7 RFAmp.

C12 T

Foreign ',Broadcast Police

C3 6000 KC

Cs 1500 KC.

Cs 6000 KC

Cr 1500 KC.

Cis IBIO KC

C 9 6250 KC

IF PEAK 456 KC Symbol Part No.

Cl C2.3,4 C5,6.7 C8.9.10 C11,21,34 C12,14 C13 C15.24 C16 C17 C18 C19 C20,22 C25,28 C26 C27 C29 C30 C31.33.36 C32 C35 C37,38 C39 C40 C41 C42 C43 R1,5,15,20,26 R2.3.13 R4,14,16,21 R6 R7 R8.17

3814 3822 3822 3822

572 580 575

2780 568

2694 2741 2560

2385 2695

824 576

1286 2600

563 579

3138 3113 3136 3112 3111 3135

603 631 615

2693 3799 2568

6A7 Osc Trans.

IC13 C14

80 Rect

escription

9-400 mmf Variable 2-35 triple trimmer 2-35 triple trimmer 2-35 triple trimmer .1-200 V. .05 200 V. .1 400 V. 50 mmf mica .01 400 V. .005 5% tolerance 1330 mmf 5% tolerance 350 mmf variable padder IF Trimmers .02 200 V. .003 600 V. .002 600 V. .02 400 V. 250 mmf mica .02 600 V. .05 400 V. .25 200 V. .001 800 V. 16 MF regulating 20 MF 25 V. 16 MF 450 V. 16 MF 500 V. .003 800 V. 100 M 1/3 W. 50 M 1/3 W. 500 M 1/3 W. 2 meg 1/3 W. 2 meg tone control 300 M 1/3 W.

--1 6146 bet AVC.

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Symbol Part No. Description

R9.23 RIO R11.12 R18 R19 R22 R24 R25 R27 R28 R29 R30 R31 R32

617 3800

624 2688 2731 2421 3805 3805 3809 3806 3808 3807 3870 3801 3796 3797 3798 2981 3838 2898 3815 3943 3817 3825 3826 3198 3199 3831 3832 3802 3818 3819

0--

20 M 1/3 W. 3 meg volume control 1 meg 1/3 W. 60 M 1/3 W. 10% 500 M 1/3 W. 10% 1 M 1/3 W. 7 M 3.5 W. 8 M 1.5 W. 100 ohms 2 W. 10% 120 ohms 1.5 W. 10% 50 ohms .75 W. 10% 35 ohms .5 W. 10% 15 ohms .5 W. 10% 2 M Variable Power transformer No. 1 IF transformer No. 2 IF transformer Tuning tube cable 12" Speaker Tuning tube clamp RF coil Oscillator coil Antenna coil Planetary drive Drive belt Idler pulley Idler spring Minute pointer Tuning pointer On -off switch RF and Antenna switch Oscillator switch



DETROLA PAGE 8-17



18 DETROLA

MODEL 163 Sohematic Parte

r

DETROLA RADIO CORP.

Tubes Tubes required are:

1-6K7G Radio frequency Amplifier 1-6A7 Oscillator-Translator 2-6K7G Intermediate frequency Amplifiers I-6H6G Detector-AVC-Bias control 1-6G5 Cathode ray tuning tube (on models

equipped with "eye" tuning indicator)

1-76 First Audio Amplifier 1-76 Phase Inverter 2-76 Drivers 4-42 Power Oútput 1 5Z3 Rectifier

o A

Cz16MC ls1

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Cu

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0 C. 1500 KC

C. 6000 KC

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Ce18.1MC a0 0 Cio1610KC Co 62 º0 CC

CN 600 KC 0

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R12

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Symbol Part No. Description

Cl 3814 C2,3,4 3822 C5,6,7 3822 C8,9,10 .3822 C11,23 572 C12,14,46 580 C13 575 C15,25 2780 C16 2694 C17 2741 C18 2560 C19,24 568 C20,21,22 C26 563 C27 2695 C28.33 576 C29 824 C30 4072 C31 1286 C32,34,35,36 2600 C37,38 3138 C39,42 4071 C40 3079 C41 4062 C43 3112 C44 3111 C45 3135 R1,4,8,16,19,22,24 603 R2,3 631 R5,6,34 2421 R7,23 615 R9 2693 R10 3799 RI1 3800

40,8

9-400 mmf variable 2-35 triple trimmer 2-35 triple trimmer 2-35 triple trimmer .1 200V. .05 200V. .1 400V. 50 mmf mica .005 5% tolerance 1330 mmf 5% tolerance 350 mmf variable padder .01 400V. IF trimmers .05 400V. .003 600V. .02 200V. .002 600V. .03 200V. 250 mmf mica .02 600V. .001 800V. 20 MF 35 WV. 8 MF 150V. 30 MF 275V. Reg. 16 MF 450V. 16 MF 500V. .003 800V. 100 M 1/3 W. 50 M 1/3 W. 1 M 1/3 W. 500 M 1/3 W. 2 meg 1/3 W. 2 meg tone control 3 meg volume control

o

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R12,20,25 R13,33 R14 R15,21 R17 RI 8 R26 R27 R28 R29 R30 R31 R32 R35

Part No. Description

2568 617 624 614

2731 2880 4068 3808 4069 3801

639 3805 3805 4070 4058 4061 4060 3968 2981 4082 4079 2898 3815 3943 3817 3825 3826 3198 3199 3831 3832 3802 3818 3819

R

Rzl

300 M 1/3 W. 20 M 1/3 W. 1 meg 1/3 W. 5 M 1/3 W. 500 M 10% 1/3 W. 100 M 10% 1/3 W. 300 ohm 10% 3 W. flex. 50 ohm 10% 3/4 W. flex. 200 ohm 10% 2 W. flex. 2 M variable 750 ohm 1/3 W. 8 M 1.5 W. 7 M 3.5 W. 100 ohm 10% 3 W. flex Power transformer No. 1 IF transformer No. 2 IF transformer No. 3 IF transformer Tuning tube cable 12" Dynamic speaker 12" P.M. speaker Tuning tube clamp RF coil Oscillator coil Antenna coil Planetary drive Drive belt Idler pulley Idler spring Minute pointer Tuning pointer On -off switch RF and antenna switch Oscillator switch



DETROLA PAGE 8-19

DETROLA RADIO CORP.

Bn CON TR0. SWITCH DN OFF SM,TCM

ANT CANA SPEKER LEADS

POWER CORD / / Knq

OSC- TRANS 647 1

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SPEAKER LEADS

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MODEL 162-A

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MODEL 159 MODEL 162A MODEL 168 MODEL 172 Schematics Sockets

POWER CORD

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MODEL 166 Schematic , Socket Trimmere,Alignºnent,Parte

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I)ETROLA PAGE 8-21

Cu9 600KC Di

I)I+,'l'ROI.A RA1)IO CORP.

Tubes required are: 1-6D6 Radio Frequency Amplifier 1-6A7 Oscillator -translator 2-6D6 Intermediate Frequency Amplifiers I-76 Automatic Bias Control 1-75 Detector AVC-First Audio Amplifier r

Tubes

MODEL 16 5 Schematic ,Parts Trimmers

1-76 Driver-Phase Inverter 2-42 Power Output 1-80 Rectifier 1-6G5 Cathode Ray Tuning Tube (on models

equipped with "eye" tuning indicator)

606 6A7

A D G

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I. T

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Police

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n C4 1500 KC

C6 G000 KC

Cs 16MC n 0 0 Ct 1500 KC

Ca 18.1 MC 1® 0 0 CIo 1810 CC C431 Cs 6250 NC

I C 16.

Czo ca. 606 cu . . .. ..9

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R I R29 Rte

Symbol Part No. Description Symbol

Cl 3814 9-400 mmf variable R11,12 C2,3,4 3822 2-35 triple trimmer R13,14.22 C5,6,7 3822 2-35 triple trimmer R17 C8,9, l 0 3822 2-35 triple trimmer R18 C11,21,34 572 .1-200 V. R19 C12,14.23 580 .05-200 V. R20 Cl3 575 .1-400 V. R24 C15.24 2780 50 mmf mica R25 C16.35 568 .01-400 V. R27 C17 2694 .005 5% tolerance R28 C18 2741 1330 mmf 5% tolerance R29 C19 2560 350 mmf variable padder R30 C20,22.44. IF Trimmer R31 C25 4072 .03-200 V. R32 C26 2695 .003-600 V. C27 824 .002-600 V. C28,29 576 .02-400 V. C30 1286 250 mmf mica C31.33 2600 .02-600 V. C32.36 563 .05-400 V. C37.38 3138 .001-800 V. C39 3113 16 MF regulating C40 3136 20 MF 25 V. C41 3112 16 MF 450 V. C42 3111 16 MF 500 V. C43 3135 .003-800 V. R1.5,15,26 603 100 M 1/3 W. R2,3 631 50 M 1/3 W. R4.16,21 615 500 M 1/3 W. R6 2693 2 meg 1/3 W. R7 3799 2 meg tone control R8 258 300 M 1/3 W. R9.23 6.17 20 M 1/3 W. RIO 3800 3 meg volume control

Part No. Description

624 1 meg 1/3 W. 2421 1 M 1/3 W. 2880 100 M 1/3 W. 10%

614 5 M 1/3 W. 2731 500 M 1/3 W. 10%

598 200 M 1/3 W. 3805 7 M 3.5 W. 3805 8 M 1.5 W. 3809 100 ohms 2 W. 10% 3806 120 ohms 1.5 W. 10% 4111 85 ohms 1.0 W. 10% 2106 3 meg 1/3 W. 3870 15 ohms .5 W. 10% 3801 2 M variable 3796 Power transformer 4061 No. 1 IF transformer 4060 No. 2 IF transformer 3968 No. 3 IF transformer 2981 Tuning tube cable 3838 12" Speaker 2898 Tuning tube clamp 3815 RF coil 3943 Oscillator coil 3817 Antenná coil 3826 Drive belt 3198 Idler pulley 3199 Idler spring 3831 Minute pointer 4113 Tuning pointer 3802 On -off switch 3818 3819 3825

RF and Antenna switch Oscillator switch Planetary dive



22 I)N.TROI.A

MODEL 165 Socket

Alignment

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ANTENNAr GROUND TERMINALS

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I)ETI OI,A IZAI)IO CORP.

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Ant. Cods

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TRAMS.

SENSITIVITY CONTROL CZ POWER CORD

3rd. IF Trans

SPEAKER SOCKET '

Tubes must be in proper position and connected as shown.

ALINEMENT PROCEDURE

Warning! This information is to be used by a Competent Service

Man only and not by an untrained person.

Connect a high impedance AC voltmeter across the loudspeaker terminals. Volume control should be

set a few degrees back of maximum volume position. Use a weak signal from the generator, strong signals tend to cause improper adjustments.

Be sure that the fidelity control is NOT in the HIGH FIDELITY position. It will not be possible to properly aline the receiver unless this control is turned part way toward its "bass'' position.

IF. Connect the generator ground to receiver chassis. Using .1 mfd condenser in series with high side of generator, apply 456 kc signal to grid of 6D6 second IF amplifier and aline transformer No. 3. Repeat for transformer No. 2, applying signal to grid of 6D6 first IF amplifier. Repeat for transformer No. 1,

applying signal to grid of 6A7 translator. (See above diagram for location of tubes and transformers.) RF. (See circuit diagram for location of trimmers.) Using a 200 mmf. condenser in series with the

high side of the generator, turn band selector switch all the way to the left, tuning condenser to minimum capacity, feed 1810 kc. signal to antenna terminal and adjust broadcast oscillator trimmer for top frequency. Set generator frequency at some point around 1500-1600 kc., and adjust broadcast antenna and RF trimmers. Set generator for 600 kc., tune receiver to signal and adjust the padder. The tuning condenser should be

rocked back and forth through the signal while varying the padder in order to assure perfect alinement.

A 400 ohm resistor must be used in series with the generator as a "dummy" antenna for proper aline-

ment of the two short wave bands. Set the band selector switch in the center position, adjust the oscillator

top frequency for 6250 kc., then aline the antenna and RF trimmers at about 6000 kc. With the band

selector in the extreme right position, adjust the top frequency of the high frequency to 18.100 kc., and

aline the antenna and RF trimmers at about 16,000 kc. In order to make sure that the top end of the last

band is set properly, it is best to screw the oscillator trimmer down tight, then unscrew to the second peak.

The antenna and RF trimmers should be screwed down tight, then unscrewed to the first peak. This pro-

cedure must be followed in order that the oscillator and RI' circuits will be set in the correct relation to each

other, otherwise a "dead'' spot at a lower frequency will result, and the dial calibration will not be correct.

Usually, it is best to rock the tuning condenser back and forth slightly while making these adjustments at

high frequencies.



DETROLA PAGE 8-23

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DEWALD PAGE 8-1

DEWALD RADIO

SERVICE NOTES

MODEL 200 ELFDTROCALL.

Failure to Function:

A. B. C.

Defective tube (loose screen grid Cap.) Open resistor line cord. Defective filter condenser: -

If unit does not operate and voltages check 0.3., suggest adding 8 mfd. 200 V oondenser in parallel with filter in unit. If unit operates, replace filter condenser.

D. Defective "Talk -Listen" switch: -

Remove set from cabinet - loosen set screws and remove lever arm - open retainer washer on s'aft - remove rotor of switch - clean contants with Carbone -

bond rotor arma to increase tension - assemble switch making certain lever arm is in original position.

E. Open 1700 ohm resistor or discolored:

Replace both resistor and seven prong tube (seven prong tube has developed internal short).

F. Reverse Line plug if connected to Direct Current.

Failure of Pilot Light:

A. B. C. D.

Pilot lamp burned out or making poor contact. Defective tube or open line cord. Pilot lamp socket opened, shorted, or grounded. Open 25 ohm wire wound resistor.

EXOess Hun:

A. Defective 6 prong tube. B. Defective Filter Condenser: -

To check -- connect 8 mid. 200 volt condenser in parallel with filter in unit. If hum ceases, replace filter condenser.

Weak Response:

A. Check second section of filter cond. B. Check speaker adjustment. C. Check tubes.

Speaker Rattles or Poor Quality:

This may be remedied by adjusting screw as indicated, also check for loose pilot lamp or bracket.

GREW -n/LY CNeaeesr M.wsNET)

If Unit "A" rattles when speaking into Unit "B" recheck adjustments on both speakers as it. nay be either the microphone unit or speaker.

If voice is audible through "ñ" when sneaking into "B" but not vice-versa, then .A's" unit is defective.

ufllfo ,9,oeon oUoo

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MODELS 200,202M Electrocall

Connections, Data

If units howl or squeal due to close proximity, insert 10,000 ohn resistor in series with one side of the cable, as illustrated.

Voltages - taken with 1000 ohm per Volt meter:

Across 1700 ohm resistor 12 to 16 Volta Across 3500 ohm resistor fr to 1 Volt Across B plus to B minus 125 to 150 Volts.

DO NOT SHORTEN LINE CORD UNDER ANY CONDITIONS.

Connect conventional extension cord, should it be necessary to extend length of line cord furnished with units.

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2 DEWALD MODELS 200A,202A,202M,203A Schematio,Inetallation,Notee DEWALD RADIO

GENERAL INSTRUCTIONS

202-M MASTER UNIT

This device is of a multiple system type, designed to operate on 25-60 cycles A.C. or D.C. 110-220 volts.

The master station may select and hold cwo way conversation with any one remote station and yet may not be overheard by any other station. Any remote station may also call the master and not be overheard by other stations.

INSTALLATION:

After locating the units the cables should be run in the most convenient manner. These cables carry no power, but care should be taken that they do not

come in contact with electrical cr telephone lines. It is also advisable not to run them parallel. (If they have to be run parallel, keep them as far sport as possible.)

TO OPERATE:

Snap middle switch to "ON" position and wait from ten to twenty seconds for tubes to heat. 'Phen operating instrument from direct supply line, it nay be necessary to reverse the current plug at

the calling stations if instrument at other and of line fails to respond and vice versa.

CALLING SIGNAL:

Turn Station Selector Switch to station desired, press "Call Listen" lever down and pull out.

Af

6C6 i =1202

MFD

TO TALK:

Press "Talk -Listen" switcn down. This switch must be held down all the while when talking. Each instrument is normally in a position to receive calls regardless of whether the switch is turned on or off. It is only necessary to turn on the instrument When calling.

TO RECEIVE CALLS;

To signal master station from individual outlying station, most convenient practice is to adapt a call system corresponding with the numerals on the master terminal board. That is, if the outlying station is attached to #5 on terminal board, then this station should depress the "Talk -Listen" key five times, When desiring to converse through the master unit.

It is advisable to set station selector switch to neutral position, which is indicated by the small arrow head between station numerals, when master instrument is not in use.

When operating Electrocall, the user should talk about an arm's length away from the grill and in an ordinary conversational tone. Talking loudly into the grill will result in greater amplifica- tion at the receiving end.

Both units must be turned "ON" when holding two way conversation. When continuous service is desired, it is necessary to keep all units turned "ON"

The tubes used for the Electrocall are especially designed for this system and can only be obtained directly from the manufacturer or through any Electrocall distributor, These tubes carry our regular ninety day guarantee.

.0/ MFO

.001 MFO

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CIRCUIT DIAGRAM -

MODELS - 200A- 202A- 203A

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DEWALD PAGE 8-3

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DEWALD PAGE 8-5

DEW ALI) ßAllIO

BACK Of DASHBOARD

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MODEL 527 Schematic Socket,Chas si s Installation, Notes

FIRE BOARD LOCAT/NG STOP -NUT

MOUNT/NO WASHER

OUNT/NGNUT

MOUNT/NG STUD METHOD OF MOUNTING MODEL Nª 527

UNDER THE DASHBOARD OF CAR DOTTED LINE OF RECEIVER ON DASH SHOWS OTHER LOCATIONS THAN CENTER

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6 DEWALD

MODMS 528,528LW MODLLi 1200 Schematica

T.,

ti li

6D6- RF

AM'

r

MDDEL 52 8-5 28 Lwl In Model 528 L.w. Ll.C1,12 & C2 are in circuit.

In Model 528 Ll. LE, Cl, k CO are omitted.

Di WALL) RADIO

6C6 -Der. 2SL6G-our-PuT

H)

".(

odo,

5

S/K12A9 6C'6 6D6 2S16G

Rect. 25Z5

.0/

4SOn `.CL i 9tieetartr r-- oT

MtSSF

/e5- /:TV AC -RC IO- dON

I/dMfi3 OAMf)<WARf 3A£f/FdFO

^.0 COI BRATE

Connect external Oscilletor'e hot leed to reel antenne of receiver.

Cannent oscillator cold leed in serle, ith u } or .1 '?D condenser

to receiver ahaeeis. Set oscillator at 7500nC and peak Variable Con-

denser trimmers for Maximum signal with condenser set approximately where 1500 oame. in on focale.

Os C - 6A 7- TRArs. - xr

. 05 /'lF

7,-J0/J1.

ti

1

Ig I ---'-'

6D6 -IF .0o005 -

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f-AMMMHIIt OUT- PUT 75

d 25L66

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s

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r /0,00

MODE L 1200

IF PEAK 456 KC.

76Arr 6.47 76A1í' 6D6 7S 2.266

D-200 D1500 r lTecr

25Z5 25Z5

S 450n Fisto

T/d

®D35

Te /0S- /2JV AC-Oi 40-detL (AveC.es O N twX

SArt/,7CO

D-7í0 CO t-nLIOr Tr: -

Set service oenli 'tor to e_h6 R.C. nd tonnent "not" lead to grid of 607 tubs. Orornd stator of front

Ioecillator) section of variable co dancer. Turn vol-

umeontrol for Rsoiean output end eak intermediate fequency trimmer, for mainate gain. Turn wave bud ewiteh knot tocard rigtt. Adjust service oae111ator end receiver to 7 negscleles an0 peak veriaale eon -

denser trtamere for nexlrum gain. turn . e bard

switch toward left ami adjust oecilistor (service) and receiver to 1500 R.C. Peak both trimmers under- esth ntseele for maxi^um gain. Thon adjust sereins reins oscillator std receiver to 600 F.C. and "rock" the variable ondenser end adjust the gadder (near front of chseeie

on top)at the eams time for maximum gain.



I)1+,1V'Al.l) l'AGE 8-7

r ; ; 02

ose- r?Nns, 6,47

AVL.

I.F. PEAK 456 KC.

LONG WAVE

OPERATION

00/7

,

,

ti e

15er

, 4f , , ;

I)r,WALD RADIO

.

:

MODELS 529,529LW MODELS 629, 629L1P, 703, 70 3L Scher.)atics, 4ligrunent

/F 2,2s. Oer 6D6 Ave -75- x?S HF

AMC.

soy

N

eery

2ME¢.

/00n 200..x-

í ,.

.SP//R. F/ELO 2000JL

fic s

Bf -,Yec/

These receivers are dual wave euperheterodynee with automatic volume control. The 529 covers the following ranges: 1650-550 R.C. and 7-2.4 M.C. The 529 -LW cover. the following ranges: 1650-550 K.C. and 340.150 R.C.

The Model 529 -LW has a long -wave band in place of the 3h.Wave band. Follow same instructions for tuning se for the Sh.Ways. band operation.

LIST PRICES OF REPLACEMENT PARTS.

1440 Power Transformer 1423A let dual I.P. 1424A 2nd "

1438 Ant, coil 1439 Ose. coil 2369 2 Gang var. cond. 2372 Electrolytic cond. 8779 Pilot socket \ / lnios-6A7- osc

, ; 4f; ;12 ; :1%

Mae

: .

o . .

$2.50 3382 comb. bias resistor .35 1.25 7212 Speaker 4.00 1;25 8660 Comb, vol. control 1.00 .70 8662 knob. .10 .65 6041 Scale 1.10

2.00 9823 Pointer .10 1.10 9818 Shaft .10 .10 9799 Drum .05

606-','"

.

. í . . i N

§ //0-/20V..9.0 6012

7

MDDEL-529 529 LW.

TO CALIBRATE: Set service oscillator to 456 R.C. and connect "ROT" lead to grid of 6A7 tube. Ground stator of front

(oscillator) section of variable condenser. Turn volume control for maximum output and peak intermediate frequency trimmers for maximum gain. Turn wave band switch knob toward left. Adjust service oscillator and receiver to 7 megacycles and peak variable condenser trimmers for maximum gain. Turn wave band switch toward right aryl adjust eerviee oscillator and receiver to 1500 L. C. Peak the trimmer next to the variable condenser and the one underneath chassis for maximum gain. Then adjust service oscillator and receiver to 600 P.S. and "rock"the variable condenser and adjust the padder (near front of chieei at the same time for maximum gain.

óét 75 ÁF

.05

02 45011-

F/EL D

JM /0/Y 2002

PeC rt5/MA2A4

I.F. PEAK 456 KC. 7s 6A7 606 25L6G

//OV-.4C.-Qc. KSY.

LIST PRICKS OW PEPLACFlxFNT PARTS

1438 Antenna coil 1439 Oscillator Coil 1423A Dual tuned I.P. 1424A 2nd det. coil

2525

4 .70 8662 knobs $ .10 .65 8627A Wave Band Switch .35 1,25 8660 Comb. volume control 1.00 1.25 6041 Scale 1.10

2369 Variable condenser 2.00 9823 vointer .10 2376 Comb. electrolytic 1.00 9818 Shaft .10 7222 Speaker 4.00 9799 Drum .05

These receivers are dual wave superheterodynea with the automatic volume control feature. The frequency ranges are as follow.:

Motels 629 and 703 - 1650-550 R.C. and 7-2.4 N.C. Models 629 -LW and 703 -LW - 1650-550 R.C. and 340-150 R.C.

®BALL.IST q -_f RES. TUBE

.O5

II->

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p 1665 :

i 6 EYE

U.sev A+' Maaet raw 7LiìLW Ona r

MODELS 629-629 LW 703-703 L.W.

Models 629 and 629 -LW: 1-6A7, 1-6D6, 1-75, 1-25L6, 1-2525, and 1 -M -49-B.

Models 703 and 703 -LW: 1-6A7, 1-6D6, 1-75, 1-25L6, 1-2525, 1 -M -42-B, and 1-605

TO CALIBRATE: Set service oscillator to 456 R.C. and connect "ROT" lead to grid of 6A7 tube. Ground stator of front

(oscillator) section of variable condenser. Turn volume control for maximum output and peak intermediate frequency trimmer. for maximum gain. Turn wave band switch knob toward left. Adjust service oscillator and receiver to 7 megacycles and peak variable condenser trimmers for maximum gain. Turn wave band switch toward right and adjust oscillator (service) and receiver to 1600 R.C. Peak both trimmers underneath chassis for maximum gain. Then adjust service oscillator end receiver to 600 R.C. and "rock" the variable condenser and adjust he padder (near front of chassie) at the same tite for maximum gain.



8 DEWALD

\17.

MODELS 6 3 3, 6 3 3 L V P, 6 3 3 S

MODELS 635,635L7T Schematics,Alignment

OSC-TRAK3 6A7

(Model 633S is same as Model 633 but without SW Band.

The yodel 635 has the following ranges: TO CALIBRATE:

550-1700 R.C. {550-175 meters) 1700-4800 K.C. (175-62 meters) 5.7-16 M.P. (18-52 meters)

The Model 635LW has the following additional range: 330-150 K.C. (900-2000 meter!)

Police Pend is omitted in Long Wave receiver. 606 -/ F

.01

.01

2523-Ree

I.)r.WAI.I) RADI n MODa, 633,633LW,633S º Npoe'r

6D6-/F Ayc-60715- 9.F

-5- --1

I.F. PEAK 456 KC.

/6\ q50 -d. T FIELD

6076 6.47

.05 T

n07 -PUT 2365

>s/MAZDA

M -49-B1

NOTE:

OSC- Red

-rein/56A7

456 K.L. WAVE TRAP

LM2

50M nANW

L

I.F. PEAK 456 KC.

2ME0.

/10-1201.1 A.C. 40-60Cócmes

Set Se Ground Volume for ms

to1500

FiAs

-In

rvice Oscillator to 456 R.C. end correct "HOT" lend to grid of 607, stator of rear (oscillator) section of variable condenser. Turn

Control for maximum output end peak intermediate frequency trimmers

ximum gain. Remove Variable Condenser short. Adjust service oscllletor end receiver

K.C. end peak variable condenser trimmers for aaximum vain.. e 7S/ Ave 42-ourpuT

I. F. ALICNMFNT: Intermediate frequency peeved nt 454 F.C. rn nect. test oecIlletor to grid

of 647 and chsee]e. Short circuit etetor of front section of variable

condenser during thus operation. Then peak I.P. trimmer. for maximum elgnal.

R. r. ALLOeVSTT: Remove ehort from stator of variable condenser. Turn Wave Bend Switch

to Broadcast. Connect test oscillator to antenna end e*eeele. net

test oscillator and radio dial to 1500 R.C. end peak teo trimmers underneath chess is.

(toward rear) for maximum signal. Set teat oscillator at 600 R.C. eri adluet redder

Orden (nut side) in front o chassie for maximum slang]. wring thus' on.retion, the

veriatle codenger must be rocked. Reedtust 1500 v.r.

1,

e

M

4

MODELS 635-635 L.W.

200 33 7,5

POLTC5 root )Urn ,Ice we d Switch to Polie. Bend. Set test oecilletor end odio

TCk sMm*: dial to 4000 X.C. end peak too trim -ere on soil on top of cheeste. net

test oscille orand radio to 1700 C.C. and adjust nailer (screw side)

for maximum etgrel. The aria le cordenger mat be reeked during the operation. Sr

poceiver hew long waves leste. of po'ice band, e libretti . me truing condenser es on

llee Pend, but set osaiilator and receiver at 300 R.C. for alignment.

Senat nave AL10MM21T:

of by short redder.

Turn 'sane à d .witch to abort sea! Set teat oscillator en! radio dial

to 15 Megecy les and peak trimmer. on bottom of chassis (toward front) for mexlenoa 'anal. Low frequency setting Is an tometicel`y Lebec care

se coils which e e carefully matched for this setting by a fixed calibrated



DEWALD PAGE 8-9

ö

I.F. PEAK 456 KC.

MODEL- 7 0 700 LW

.01

\0.e0taVa

DEWALD RADIO

reANs-,,4' o3c

ON GONF WAVC RFC!/PZ-eS TAW ,SfaoER/J .0001111

.004

.

1f

MODELS 700,700LW ::iODF72 700A, 700A-LW Sch©matics,Alignment

.93_vvrPUT

/,tlK-AC-QC. 40404.4

I/6 C.,Ckdf 400z

telni` Ili

75

f/ELO

647 606 15

1. I

//lea ^AAA,

25 -ZS

J 665

'46 'Pt6

L 11-C

/.F..ItLirG.NME/NT- A/kTf:.,yEp/..7E F ̀me,E,.rY e...reo /y5- 4J-6-zee.CONNIC>7Tt> G?JC/LL I70.G T. y.!/O Cif OA74Ae0 C/Y.ftt4..S,YO.!>`<et'({/J

/Ti/7/t Of / CON7SfG7/ON OFY/1.l,AOLE CONOENjER OPL.C17/g N,

fAGN/1ET pE/10 7e .*e VJ t,Xf. f<Mo/L«Efyc,//INS

iIL.

Tt B.w

O¡QoRA90C..s7-aAiLit-CTO.f4«,,7-0tf- TAK7-0:4-K4/No A10 T /sao/reAvoiC {/eC7,7rjyVyEt Fqe/fatX/MUM&"7" 717OCiL,A6G ,9/A70/<J>/.iprOI O/O./ER

CANOEN1E.t /NFONTfCY./Lts/iFae .13(47,44.F7/s .44(0" 1.4r, /S00 e "tiL/B/tOAL/0YFF/> /TOW {y4/i! /py.VQJtyCNTt/GEBAHw /No AINO.ILTvov.Y.C

N0 i9R F.eR1.7O^.jSFK,et..V7-E LO/lREd. 70M97iCAGLyAaUs7E0pY/n%/I O C.X/QeNO "eoOEe. /fPECE/slYrt/ylJLaviW.ises>E.rni< Ar<

AtNOLtKVRIE C /2J ON tFOoN Be.T .SE7 OJ47/L/A70.í Attar (/ORT W.fI/EA!/6<Y/IENT T e.

A .500 WB V.W/7/TY.C, C`NR

AGW/9BNYEM

-

EvNf7>. TJ7vC /AN o/P op<ºG T /S/NetWrc9<vtECAoivo

Wrset .einve.es Nc.n.CALs[s,.s Îe.M.r.SiiLN,AZLe.SE77/N` A5.47OMsrt-.k 1-TtOB.So.t AREClCLyF r

SE772:4eÇBrA F,YEO C.o«o...v Eo PAOOE.e 23Z 66 our T/{ANS- 03C

611.7

I.F. PEAK 456 KC.

ti

SM -%/SIVSISANNI.os

8 sffpt 600

T. P. CTICleu77^: Tot.rmed/ete free-enef risked et 456 X. C. Connect teat oscillator to grid of 60.7 and cheerio,. Short circuit stator of front eetien of verl.h`e condeneer during this operation. Then peak I.P. trimmere for maximum .í0u1.

It. P. sLT0ev!wrt Remove short from ateter of vorisbls conden.er. Turn rave Band Switch to Brosdoot. Connect teat oscillator to antenna and ch.s.ls. Set test oacilletòr and radio dial to

1500 r.C. and peat' two primers underneath Chain., (toward rear) for maxima. (lineal. Set test oscillator at 600 R.C. Sol edryet adder con - denier (nut eidel In front of chase!. for maximum stare]. Suring this operation, th- variable condenr.r Suet be rocked. Readjust 1500 E. C.

/F- 6D6/

LO

Ar6 /NA!

ZBOOn. FE<o

7.5" 66S 606 647 zed

/A}/eYAv.{ C. Ot fa-oOCYrJ

'"16,4Jstoa,

P01.ICR 36115 Turn ;nee Band Setter( So Potlee Band. Set test co stsoinewe t cillator end radio dial to 400 R.C. sod peek two Leiaere on coil on top of cheest.. Set teat e cllletor and radio to 1700 R.C. end ad3)uet pod.er (soren side, for maximum .100.1. The variable eondsn.er Aret be reeked during the operation. If receiver ha long in.taad of police band. calibrate e trimming condenser as of Police Bond, but set oscillator and receiver .t 300 F.C. for alignment.

$3.66.2 .2612 Turn Rave band ewitsh to short wave. Set Net o. ALTSw r: eilleter end radio dial to 10 Megacycle. and peak

trimmers on bottom of ch...is (toward front) for maximum signal. Lem frequency Setting in eutomatieelly taken ner of =teed short wave coils chick are earefully for this lotting by a fixed calibrated padd.r.

MN ;48. E YE

MODEL S 700A

700A LW



10 DEWALD

4.1l.111.1»

1 T 111Z

deli

1g6 ooww

tail :i iiihi LIST PRICES OF REYLACEVENT PARTS

1431A Power Transformer $ 3.00 3407 Volume Control 1.10

1432A A Choke .30 5077B Antenna Cable .85

5094 Combination A Cable .50

1433 B Choke .95 7194 Speaker 5.50

1486 Antenna Coil .90 3608 Vibrator 5.00

1308D 1st Detector Coil .95 8399 Fuse Retainer .20

1309A Dual I.F. Transformer 1.50 8400 15 Ampere Fuse .05

1310 2nd Detector Coil 1.30 8777 Knob .20

1454 Oscillator Coil .75 8792 Remote Control 5.75

2317 3 Gang Variable Condenser 4.50 9850 Cable and Sheath 1.50

2362 Dual 8 ElActrolytic Condenser... 2.05 9517 Mounting Stud .05

2390 Spark Plate Condenser (Chassis). .25 7/16 Hexagon Nut . 05

2391 Spark Plate Condenser (Can) .25 Pilot Lamps .10

3390A Tone Control .80



DICTOGRAPH PAGE 8-1

ir)

k/00000000000 Moog,

MODELS 91134,91134A DIC'I'OGRAPH PRODUCTS CO., INC. Scheaatic,Parts

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2 DICTOGRAPH

»MODELS 91134,91134A MODELS 91168,91175 DICTOGRAPH PRODUCTS CO" INC. Alignment

This receiver is equipped with an automatic overload control which necessitates

setting the manual volume control of the receiver to its maximum position to

insure accuracy in alignment. To control the signal output of the receiver it

will be necessary to use the attenuator control of the signal generator.

Connect the low potential side of the signal generator to the metal chassis

through a .1 mfd. (400 volt) condenser for the following adjustments.

(a) - Remove (carbon type tential lead tubular 400

Socket,Trimmere

ADJUSTMENT OF I.E. CONDENSERS

the control grid lead of the 6A7 tube and insert a 50,000 ohm

1/3 watt) resistor in series with same. Then connect the high po -

of the signal generator through a .001 mfd. condenser (paper

volt type), directly to the control grid of the 6A7 tube.

(b) - Turn the rotor plates of the ganged variable condenser where no broadcast

station carrier is heard (approximately 1000 KC). If this is not possible

connect a .1 mfd. condenser (paper tubular) from the oscillator stator section

(see sketch) of the ganged variable condenser to chassis.

(c) - Place an output meter (copper oxide type) across the

with the speaker control switch in a clockwise position so

signal output can be noted.

(d) - Place the signal generator in operation, adjust the carrier frequency to

456 KC and regulate the attenuator control of the signal generator so that

the output signal is low enough to insure accuracy in adjusting the I.F.

condenser.

mystic ear terminals

that variations in

(e) - Adjust trimmers T-1, T-2 and T-3 (see alignment layout) to resonance as

indicated by the greatest swing on the output meter.

ADJUSTMENT OF THE GANGED VARIABLE CONDENSERS

(a) - Remove 6A7 tube and

of the receiv

a 200 mmfd. c

the signal generator connection from

replace the control grid lead. Then

er to the high potential lead of the

ondenser (mica type).

the control grid of the

connect the antenna wire

signal generator through

(b) - Set the dial pointer directly at the last long line

side of the dial with the ganged variable condenser fully

rotate the receiver dial to 1,500 KC.

at the right hand meshed. Then

(c) - Adjust the carrier frequency of the signal generator to 1,500 KC and,

starting with trimmer T-4 and then T-5. adjust each for maximum signal output.

,11 MYSTIC EAR TERMINALS

ALIGNMENT LAYOUT

T-1 (456 KC)

T-3(4056 KC)

1" I. F.

Tra ns.

T-2 (456 KC)

r

T-5 1500 KC)

T-4 1500 KC)



DICTOGRAPH PAGE 8-3

L W N

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MODELS 91168,91175 I)IC'I'OGRAPH PRODUCTS CO., INC. Schematic,Parts

regle,

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ELEC. ACM'. PAGE 8-1

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MODEL A1832 Amplifier ELECTRO-ACOITS'l'IC PRODUCTS CO. Schematio,Voltage

111'

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2 ELEC. ACOU. MODEL A1832 Amplifier MODEL A2023 AmplifierELECTRO-ACOUSTIC PRODUCTS CO. Chassis Layouts

O T2 O 330209

J

SPK

0"0 000

/82567 O 0 O 0

182524,

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m cv á-o

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CHASSIS LAYOUT - MODEL 1832

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ELEC. ACOT . PAGE 8-3

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Schematic,Voltagea ò

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4 ELEC. ACOU.

MODEL A2232 Amplifier Schsmatic,Voltage ELECTRO -ACOUS'T'IC. PRODUCTS CO.

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ELEC. ACOU. PAGE 8-5

MODEL A2232 Amplifier ELECTRO -ACOUSTIC PRODUCTS MODEL A3041 Amplifier

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2 EMERSON

MODELS AD1O8,AD110 AD125 EMERSON RADIO & PHONO. CORP.

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EMERSON PAGE 8-3


BATTERY CABLE COMING FROM ORARAIS

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TEETH OF CLIPS MIST BITE FIRMLY INTO BATTERY TERMINALS FOR PROPER OPERATION

PLUS 0A POSITK TERMINAL ON BATTERY

BATTERY CONNECTIONS

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4 EMERSON

MODELS P117,P135 Chassis P Voltage,Alignment Notes, Parts

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In receivers bearing serial numbers below 1,258,237: a. C17 was a .001 mf, 600 volt tubular condenser. b. R11 and C18 were connected from the plate of the 41 tube to B plus as shown by

the dotted lines on the schematic aiagram.

In receivers bearing serial numbers below 1,333,800: a. The second detector and first audio amplifier was a type 75. b. R9 was a 310 ohm %Z watt wire -wound resistor, part number 3RR-276. c. R10 was a 23 ohm 1/2 watt wire -wound resistor, part number 3RR-266.



10 EMERSON

MODELS AC130,AC149,AC168 Chassie AC EMERSON RADIO & PHONO. CORP. Alignment, Note a ,Parte

GENERAL NOTES

1. The wave -trap in the receiver has been adjusted for maximum signal rejection at 466 kc. If, however, persistent interference is experienced from some particular telegraphic station, readjust the wave -trap trimmer until the response from the interfering station is at a minimum.

2. The receiver should never be turned on with the 41 tube out of its socket since the rapid rise in rectifier voltage would damage the electrolytic condensers.

3. The two i -f transformers are held to the chassis by snap -on fasteners. To remove an i -f unsolder all the leads under the chassis, pinch together the prongs of the snap -on fastener and lift the i -f can from the chassis.

4. The color coding of the leads of the i -f transformers, is as follows: Grid -green Plate -blue Grid return -black H plus -red

6. The color coding of the power transformer leads is as follows: Primary -two green leads 6.3 v. sec -two heavy blue leads High voltage sec. -two black leads 5 v. sec. -two heavy red leads High voltage sec. center tap -yellow

6. With s few exceptions, the color coding of the general wiring is as follows: Plate -blue A.v.c. and cathode -white or yellow B plus -red Grid -green Screen -brown Filament and ground -black

7. An efficient antenna system is necessary to enable a full realization of the merits of the receiver. For reduction of noise and achievement of high efficiency on all frequency ranges the Emerson All -Wave High -Fidelity Antenna, Model W-78, and the Emerson All -Wave Antenna System, Model W-89, are recommended. Instructions for the installation of these antennas are supplied with each kit.

In congested areas where the installation of a large antenna is not desirable we recommend the nee of the Emerson Flexible Mast Antenna, Model W-82. Instructions for the installation of this compact and efficient antenna are supplied with each kit.

ADJUSTMENTS An oscillator with frequencies of 456 and 1400 kc is required.

An output meter should be used across the voice coil or output transformer for observing maximum response.

Always use as weak a test signal as possible when aligning the receiver.

Location of Coils and Trimmer Adjustments

The two i -f transformers are located on top of the chassis deck. The first i -f transformer is the one directly behind the variable condenser. The trimmers for the two i -f transformers are available through holes in the tops of the cans.

The trimmers for the antenna and oscillator coils are located on the variable condenser. The trimmer on the front section is for the antenna coil.

The 466 kc wave -trap is mounted on the front chassis wall beneath the variable condenser. The trimmer for the 456

kc wave -trap is mounted on the coil and is accessible from the bottom of the cheesier

l -f and Wave -Trap Alignment Rotate the wave -band switch to the broadcast (clockwise) position. Set the variable condenser at the minimum

capacity position and feed 456 kc, through a 0.02 mf paper condenser, to the grid cap of the 6A7 tube (do not remove the grid clip from the tube). Adjust the four i -f trimmers for maximum response. Feed 466 kc to the antenna through a standard dummy antenna (a .0002 mf condenser may be used as a substitute) and adjust the wave -trap trimmer for minimum response. (See General Notes.) R -f Alignment

With the wave -band switch in the broadcast position, clockwise, set the dial pointer at 140. Feed 1400 kc through e

standard dummy antenna (a .0002 mf condenser may be used as a substitute) to the antenna lead and adjust first the oscillator trimmer (on rear section of variable condenser) then the antenna trimmer (on front section of variable con-

denser) for maximum response. The police band is self -tracking and does not require any adjustment.

REPLACEMENT PARTS LIST

*Item Pct No. DESCRIPTION

LMPdoa Et/min o of Auy I.. 19217

(e u o ubie choose orotn hodQ) PRICE

Ll MMT-149A 456 kc wave -trap $ .60 8 Ti SRT384 Two -band antenna coil .

T2 SRT-819A Two -band oscillator coil -8o

T8 3RT-820B 456 kc first i -f transformer. 1.10

T4 3RT-32113 456 kc second i -f transformer 1.10

T5 3BT322A Power transformer 3.30

Rl KR -53U 50,000 ohm 'V watt carbon resistor .16 R2 3LR-265U 40,000 ohm %= watt carbon resistor .16 e R3 HR -2U 2 megohm % watt carbon resistor .16 -D R4 3FR-265B Volume control with switch -260,000 ohms 1.00 E

R6 3RR-274U 5 megohm %4 watt carbon resistor .16 c £ 00 R6 KR -56 260,0 ohm "% watt carbon resistor .16 .

R7 KR -56U 600,000 ohm /4 watt carbon resistor .16 t te

R8 3RR-276U 10 megohm % watt carbon resistor .16 .o 3

R9 4CR-321 290 ohm %z watt wire -wound resistor .16 R10 4CR-820 35 ohm 1/2 watt wire -wound resistor .16 R11 LR -65U 10,000 ohm %a watt carbon resistor .16

fG1 Trimmer, part of 466 kc wave -trap assembly. IC2, C5 Trimmer, part of variable condenser.

CS, C4 4CC-350A Two -gang variable condenser 2.60

tC6, C7 Trimmer, part of first i -f transformer. tC8, C9 Trimmer, part of second i -f transformer.

C10 AAC-114 0.001 mf mica condenser .20 C11, C18 CI8 BC -12 0.06 mf, 200 volt tubular condenser .20 C12 AAC-106A 0.00005 mf mica condenser .20 C14 IC -47A 0.0005 mf mica condenser 20 C16, C17 HC -34 0.006 mf, 600 volt tubular condenser .20 C16 KC -68 0.01 mf, 400 volt tubular condenser .20 C19, C20 3RC318A Dual 6 mf, 300 volt dry electrolytic condenser 1.00

8RS-231 Wave -band switch .85 4CS-269 61/2" dynamic speaker 4.76 XL -9 Pilot light, 6.3 volt, .26 amp., Mazda No. 48 .20 4LZ-582 Dial face

.70 e t. t. 3CZ-886 Drive belt for dial assembly 6 8CZ-337B Drive shaft and pulley for dial assembly .10 o a

SCZ-839 Idler pulley for dial assembly .06 a 8CZ-340 Idler spring for dial assembly .05 0 8 3CZ-841 Condenser shaft pulley .10 ' S 4MZ-688 Dial pointer .25 3FZ351 Escutcheon with crystal (for Models AC -130 and AC -168) 1.05 8FZ-398A Dial crystal (for Model AC -149) .50 8FZ399 Clip for dial crystal (for Model AC -149) .01

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EMERSON PAGE 8-11

MODELS AJ130,AJ137, EMERSON RADIO & PHONO. CORP. Chassis AJ AJ149

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12 EMERSON

MODELS AJ130,AJ137,AJ149 Chassis AJ EMERSON RADIO & PIIONO. CORP. Alignment,Notes

1.

Type i% volt "A"

4b1 volt "B"

MODELS AJ-130, AJ-137, and AJ-149 CHASSIS MODEL AJ

Current drain "A" battery-.42 amps. "B" battery-.016 amps. with no signal

Frequency range 640 to 1730 kc.

GENERAL NOTES

The battery complement should be as follows:

Portable (Small Eveready

No. Req. Part No. 2 7111 3 762 (plug-in type)

Batteries) Burgess Part No.

4FA 5308 (plug-in type)

Ray -o -vac Part No.

6 Railroad 5303 (plug-in type)

Home (Heavy Duty Batteries) 3 volt "A" 1 X-125 20F2 P9403

45 volt "B" 3 385 (plug-in type) 22308 (plug-in type) P9303 (plug-in type) The batteries indicated above for portable use are chosen for size so that the entire complement can be housed

by the portable cabinet. In general, it will be found that the "B" batteries will last somewhat longer than the "A" batteries.

2. The receiver is designed for an "A" supply of 2 to 3 volts. If a 2 volt storage battery is used, its positive terminal should be connected to the terminal marked "2" on the metal clad ballast resistor. If a 2%2 volt air -cell battery is used, it should be connected to the terminal marked "2.5". A 3 volt supply should be connected to the terminal marked ,63

3. The i -f transformers are of the snap -on type. To remove, unsolder all leads under the chassis, pinch together the prongs of the snap -on fastener and lift out.

4. The color coding of the i -f transformer leads is as follows: Grid-green Plate-blue Grid return-black B plus-red

5. An efficient antenna system is necessary to enable a full realization of the merits of the receiver. For reduction of noise and achievement of high efficiency on all frequency ranges the Emerson All -Wave High=Fidelity Antenna, Model W-78, and the Emerson All -Wave Antenna System, Model W-89, are recommended. Instructions for the installation of these antennas are supplied with each kit.

ADJUSTMENTS

An oscillator with frequencies of 456 and 1600 kc should be used. An output meter should be used across the voice coil or output transformer for observing maximum response. If the circuit is at all disturbed, the receivers must be realigned. The set's oscillator is higher in frequency than the signal, so images should be observed on the low frequency side

of the signals. Always choose the minimum capacity peak on the oscillator trimmer and the maximum capacity peak on the an-

tenna trimmer. The last motion in adjusting trimmers should always be a tightening one, not a loosening one. Never leave a trimmer with the outside plate so loose that there is no tension on the screw. Either bend the plate

up or remove the screw entirely. Always use as weak a test signal as possible during alignment.


The two i -f transformers are located on top of the chassis deck. The first i -f is the one directly behind the variable condenser. The four trimmers, two for each transformer, are accessible through holes in the tops of the cans.

The antenna and oscillator trimmers are located on the right hand side of the variable condenser. The rear trimmer is the oscillator trimmer.

On portable model AJ-137, the 466 kc wave -trap is located below the chassis deck, directly underneath the variable condenser. Its trimmer is accessible through a hole in the bottom plate.

Alignment Procedure

1. Rotate the variable condenser to the minimum capacity position.

2. Feed 456 kc to the grid cap of the 106 tube.

3. Adjust the four i -f trimmers, repeating for maximum response.

4. If the receiver is portable model AJ-137, feed 456 kc to the antenna through a standard dummy antenna .0002 mf mica condenser may be substituted) and adjust the wave -trap trimmer for minimum response.

5. Set dial pointer to 1600 and feed 1600 kc to the antenna lead through a standard broadcast dummy antenna .0002 mf mica condenser may be used as a substitute).

6. Adjust the oscillator trimmer (on rear section of variable condenser) for maximum response.

7. Adjust the r -f trimmer (on front section of variable condenser) for maximum response.

(a

(a



EMERSON l'AGE 8-13

MODELS AL130,AL132 AL149,AL168

Chassis AL

YC3 Gem vaRTER

6A7

RI

C13 Cl2

T4

SWITCH SHOWN iN BROADCAST POSITION NO I POLICE

NO 2 BROADCAST I.F. PEAKED AT 458 KC

6 TUBE AC DC RECEIVER

CHASSIS MODEL AL

RI

.."C12 C13

EMERSON RADIO & l'IIONO. CORP.

F2

IF 606

AC OR DC LINE

POSITION CI4

VIEW LOOKING AT PINS OF BALLAST TUBE RI2, WHICH HAS AN OVERALL VOLTAGE DROP OF 49V. AT .3 AMP. VOLTAGE DROP ACROSS PILOT LIGHT IS 4 VOLTS

T3

2iVO OET Aye -157,9F

6Q7

ñLrtT, SFIELÓ R

25Z5 * i T

I 4SO OHMS 7C23 C24

RI2 V 25Z5 25L6 806 847 807

PILOT LIGHT

HEATERS

C3 6A7- Cd N. 6D6-/F T3 6Q7 2.vD DE7

IF PEAKED AT 456 KC

6 TUBE AC OC RECEIVER

CHASSIS MODEL ALLAA

SNITCH SHOWN POSITION NO.1

NO.2

C26

IN LONG WAVE POSITION BROADCAST LONG WAVE

C

AC ,NRE DC

A'tCT. 25Z5

27 CM

VIEW LOOKING AT PINS OF BALLAST TUBE RI2 WHICH HAS AN OVERALL VOLTAGE DROP OF 49V, AT 3 AMP VOLLAGE DROP ACROSS PILOT LIGHT IS 4 VOLTS

R12

SPEAKER FIELD

450 OHMS

=C23

MODELS ALLW130,ALLW132, ALLW149,ALLW168

Chassis ALLW Sc henati c -s ,Vol tage

OUTPUT 25L6

4' O Ñ z

MODELS AL- 130, AL- 132,

AL- I 49, AL- I 68

C20

Y 25Z5 25L6 606 6A7 607

PILOT e / LIGHT

VOLTAGE ANALYSIS Readings should be taken with a 1000 ohms -per -volt meter.

(chassis) with the volume control turned on full and no signal. cycles, a.c.

Voltage Voltage Voltage Voltage

Tube Plate Screen 6A7 100 50 6D6 100 100 6,27 43 0 25L6 92 100

at 25Z5 cathode -130 volts across speaker field -28 volts. drop across ballast tube (pins Nos. 3, 7)-49 volts. drop across pilot light section (pins Nos. 8 and 7)-4 volts.

HEATERS

25L6-GurpoT

OUT PUT TRANSFORMER ON SPEAKER

Voltages listed below are from point indicated to ground Line voltage for these readings was 117.6 volts, 60

Cathode 2.3 3.5 1.2 6.5

Osc. Plate Fil. 100 6.3

6.3 6.3

25.0

Úx xc LO

Ñ o

MODELS ALLW- 130, ALLW-132, ALLW-149, ALLW-168



14 EMERSON

MODELS AL130,AL132 MODELS ALLW130,ALLW132 AL149,AL168 EMERSON RADIO & PHONO. CORP. ALLW149,ALLW168

Chassis AL Alignment,Parts,Notes

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©John F. Eider, Publisher


EMERSON PAGE 8-15

Below acri Above Serial 1266501 Schematice,Voltages

L

CS

e C7

p 1.Ce o wF


C oNVtejst 6A7

C6 - 2

C97

SHORTING SECTION ON BACK OF WAFER

2

C4

:o3

C3

RIB

R2

T3

IF 606

1 C19

CIS

OI@

C23

C20

T4

emo 2 á Ç 1C22

2 N Dr -r. Ave- /sr AF

75

R7 4r

CIT

C18

T2

N.Igzr AIME CII

03 0

01

WAVE BAND SWITCH SHOWN IN SHORT WAVE POSITION. POSITION NO.I SHORT WAVE

NO.2 BROADCAST NO.3 LONG WAVE

IF PEAKED AT 456 KC 5 TUBE AC OC RECEIVER

TO AC OR OC LINE

R3

R6

C24

.r

PILOT LIGHTS

C p

C25

517

RS C28

C27

C2

R12

C28

R20

R13

MODEL AA131 Chassis AA

CUTPT 43

C42

SPEAKER FIELD C38 3000 OHMS

R 22

C40

2525

TC4I

R16

1,013e0

R21 C39

R23

200 OHMS

L3

C33 T TC37

VIEW LOOKING AT PINS OF TUBE. OVERALL VOLTAGE DROP ACROSS BALLAST TUBE 49 V. AT .3AMP.

KEY 2525 43 6De 6A7 75

The tube complement for receivers bearing serial numbers below 1,266,501 is as follows: 1-6A7 pentagrid oscillator -modulator 1-6D6 first i -f amplifier 1-75 diode detector, a.v.c., audio amplifier 1-43 pentode power output 1-25Z5 dual half -wave rectifier 1-3CR-241 ballast tube.

C oNVERTER-6 A7 TI

LI

L2 IRI

SHORTING SECTION ON BACK OF WAFER

\ I 2 O O

O

O ,t O

0 %." 0 O

3 2

T3 rF-6D6 u e C-1-7-76----- 21a

GC 9

C24

FOR RECEIVERS BEARING WAVE BAND SWITCH SHOWN SERIAL NUMBERS ABOVE IN SHORT WAVE POSITION 1,266,501 KEY POSITION NO.I SHORT WAVE

NO.2 BROADCAST SCHEMATIC DIAGRAM NO.2 PILOTLIGHT 4VOLTS DROP ACROSS N0.3 LONG WAVE PILOT LIGHT

Readings should be taken with a 1000 ohms -per -volt meter. Voltages l'sted below are from point indicated to ground (chassis) with the volume control turned on full and no signal. Line voltage for these readings was 117.5 volts, 60 cycles, a.c.

The following are voltages for receivers bearing serial numbers below 1,266,501: Tube Plate Screen Cathode Osc. Plate Fil.

57

OUTPUT TRANSOM SPEAKER

TC31

SCHEMATICDiAGRAM NO I

FOR RECEIVERS BEARING SERIAL NUMBERS BELOW 1,266, 501

The tube complement for receivers bearing serial numbers above 1,266,501 is as follows: 1-6A7 pentagrid oscillator -modulator 1-6D6 first i -f amplifier 1-6Q7 diode detector, a.v.c., audio amplifier 1-25L6 beam power output 1-25Z5 dual half -wave rectifier 1-2UR-224 ballast tube.

WoPEr-6Q7- ,JT RF. C28 AVc T' 122

5 TUBE AC DC RECEIVER

O AC OR DC

LINE

25Z5 -REGT

=C32 RIS VIEW LOOKING AT PINS OF TUBE.

' OVERALL VOLTAGE DROP ACROSS BALLAST TUBE RIS 49VOLTS AT .3AMPS.

25Z5 25L6 6D6 647 607G

C 9 OUTPUT OUTPUT

25L6 TRANSFORMER ON SPEAKER

450

-. SPEAKER

C339.6, FIELD w C34

=C31

6A7 96 35 0.6 6.3 6D6 . 96 78 2 6.3 75 35 - 0 6.3 43 85 96 0 24

Voltage across speaker field -125 Voltage across filter choke -11.1 The bias for the 75 and 43 is developed across resistors

R22 and R23 (see schematic diagram). The voltage across R22 is 11 volts and the voltage across R23 is 1 volt.

The voltage drop across the ballast resistor (R16-see schematic) is 49 volts between pins 3 and 7.

6A7 . 100 42 1.6 6D6 ... 100 100 3.6 6Q7 36 - 0.8 25L6 95 100 6.7

Voltage across speaker field -27.5 The voltage drop across the ballast resistor (R15-see

schematic) is 49 volts between pins 3 and 7.

The following are voltages for receivers bearing serial numbers above 1,266,501: Tube Plate Screen Cathode Osc. Plate

75 Fil. 6.3 6.3 6.3

24



16 EMERSON MODEL AA131 Chassis AA Below and Above Serial 1266501 Alignment, Note s,Par to

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MODELS M134,M136 M138 ,M139 11140,1e142 M146

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EMERSON PAGE 8-23

Below and Above Set.895962 Schematics, EMERSON RADIO & PHONO. CORP.

MCDII. L143 Chassis L

C

456 K.0

TRAP

C

PLUGGED INTO FEMALE RECEPTACLE

ON MOTOR BOARD

SWITCH SHOWN IN BROADCAST

POSITION

POSITION NO .I - BROADCAST POSITION NO.2-SHORT WAVE

I.F. PEAKED AT 456 K.C.

GonveRTER 6A7

XECT. 80

1

1

iF

Ti 6D6 T4

SPEAKER FIELD

i 06b68 29 1050 OHMS C2B TC27

EL PILOT LIGHT

6¡¡(B^5 7(4^1y¡

1 1_ 1 1_

HEATERCIRCUIT

SCHEMATIC DIAGRAM NO.1

2nD OFT ere -/Sr,}F

85

GREEN

TONE CONTROL Ov TPOT

C25 -SWITCH

C22 41

R9

RED .1- WHITE

+-BLACK

OUTPUT TRANSFORMER ON SPEAKER

TRANSFORMER FIELD

SPEAKER PLUG LOOKING AT PINS. SEE ENCIRCLED NUMBERS ON SCHEMATIC

FOR CONNECTIONS GROUND

1 TO CHASSIS

SHIELD

THREE POLEDOUBLE THROW SWITCH. SHOWN IN PHONO.POSITI

MAGNETIC PICKUP

MOTOR

FEMALE RECEPTACLE

WIRING AND APPARATUS ON MOTOR BOARD

TO A C

LINE

TI

456

TRAP` KC\

LI

PLUGGED INTO FEMALE RECEPTACLE

ON MOTOR BOARD

SWITCH SHOWN IN BROADCAST

POSITION

POSITION NO.I-BROADCAST POSITION NO 2 -SHORT WAVE

CoNVERTLR IF 6A7 T5 6D6 T4 75

2No D.ET Ave -/S 1CAF

TONE CONTROL

oorPM7- C25 /4" SWITCH

C22 41

OUTPUT TRANSFORMER ON SPEAKER

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RED. BROWN AT PINS. SEE ENCIRCLED

SPEAKER FIELD NUMBERS ON SCHEMATIC (-t1 FOR CONNECTIONS ® I I *GROUND OHMS

H BLUE+ I TO CHASSIS 11050 OHMS 29 =C28 Z. C27 r-1 SHIELD

1 i---1 H II-___ _

yyy TWO POLE DOUBLE THROW SWITCH 1 0 1 0 1. SHOWN IN PHONO . POSITION. - 6A7

/`7//5, `4/1, T` I

11 ( t MAGNETIC

pp _ I PICKUP

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I 1 `MOTOR PILOT LIGHT TO A C.

LINE 1

RECEPTACLE FEMALE

I F PEAKED AT 456 K C WIRING AND APPARATUS f SCHEMATIC DIAGRAM NO.2

ON MOTOR BOARD



24 EMERSON

MCDEL L143 Chassis L EMERSON RADIO & PHONO. CORP. Below and Above #895962 Alignment,Voltage,Parts Notes,Changes

Combination Phonograph and Five -Tube, A.C., Dual -Wave Superheterodyne

MODEL L143 Ch..Y Model L

Voltage rating 106 to 126 volt., ac Current drain 0.6 ampo. for receiver.

tFrequency

range 540 to 1750 ke, 2200 to 7500 ke.

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EMERSON PAGE 8-25

u

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Voltage rating Power consumption Frequency ranges

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EMERSON PAGE 8-27

EMERSON RADIO & PIIONO. CORP.

TRANSFORMER FIELD

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28 EMERSON

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EMERSON PAGE 8-29

Schematic, Triu,mers,Phono Data

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MODELS R152,R153 R156,R158 EMERSON RADIO & PHONO. CORP.

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EMERSON PAGE 8-35

MODEL AIi162 Chassis AH Schematic, Changes Parts

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36 EMERSON

MODEL AH162 Chassis AH Voltage ,Alignment Notes


VOLTAGE ANALYSIS Readings should be taken with a 1000 ohms -per -volt meter. Voltages listed below are from point indicated to ground

(chassis) with the volume control turned on full and no signal. Line voltage for these readings was 117.5 volts, 60

cycles, a.c. Tube Plate Screen Cathode Ose. Plate Fil. 6A7 100 55 2.0 77 6.3 6D6 100 100 3.3 - 6.3 6Q7G 38 - 1.0 - 6.3 25L6 96 103 6.7 - 26.0

Voltage at 25Z5 cathode -130 volts. Voltage across speaker field -28 volts. Voltage drop across ballast tube (pins Nos. 3, 7)-49 volts. Voltage drop across each pilot light section (pins Nos. 2, 8 and Nos. 8, 7)-4 volts

1. Íf replacements are made or the wiring disturbed in the r -f portion of the circuit, the receiver should be carefully re -aligned.

2. One side of the power line is directly grounded to the chassis base. Under no circumstances, therefore, should a ground wire be permitted to come in contact with any metal part of the receiver.

3. The filament dropping resistor (R13 on schematic) is in a.special metal tube at the rear of the chassis. This tube will become quite hot under normal operating conditions. For voltage drop specifications, see below.

4. When operating the receiver on d.c. it may be necessary to reverse the line plug to obtain the correct polarity. 5. The color coding of the i -f transformer leads is as follows:

Grid-green Plate-blue Grid return-black B plus-red

6. An efficient antenna system is necessary to enable a full realization of the merits of the receiver. For reduction of noise and achievement of high efficiency on all frequency ranges the Emerson All -Wave High -Fidelity Antenna, Model W-78, and tiffe Emerson All -Wave Antenna System, Model W-89, are recommended. Instructions for the installation of these antennas are supplied with each kit.

In congested areas where the installation of a large antenna is not desirable we recommend the use of the Emerson Flexible Mast Antenna, Model W-82. Instructions for the installation of this compact and efficient antenna are supplied with each kit.


An oscillator with frequencies of 456, 600, 1600 and 6,000 kc should be used. An output meter should be used across the voice coil or output transformer for observing maximum response. If the circuit is at all disturbed, both the broadcast and short-wave bands must be realigned. The set's oscillator is higher in frequency than the signal, so images should be observed on the low frequency side

of the signals. Always choose the minimum capacity peak on oscillator trimmers and maximum capacity peaks on antenna trim-

mers. The last motion in adjusting trimmers should always be a tightening one, not a loosening one. Never leave a trimmer with the outside plate so loose that there is no tension on the screw. Either bend the plate

up or remove the screw entirely. Always use as weak a test signal as possible during alignment. Use a standard dummy antenna for aligning either of the bands. A .0002 mf condenser may be used for the broad-

cast band dummy antenna and a 400 ohm non -inductive resistor for the short-wave dummy antenna.


The two i -f transformers are located on top of the chassis deck. The second i -f is the one directly behind the variable condenser. The four trimmers, two for each transformer, are accessible through holes in the tops of the cans.

The adjustable padding condenser for the broadcast band is mounted underneath the chassis (in the corner near the 6A7 tube) with the screw adjustment accessible through a hole in the top of the chassis.

The antenna coils for the broadcast and short-wave bands and the 456 kc wave trap are wound on one form and mounted underneath the chassis deck directly behind the adjustable padding condenser. The trimmers for these coils are accessible through holes in the top of the chassis. The trimmer nearest the front of the chassis is the short-wave antenna trimmer. The central trimmer is the broadcast antenna trimmer. The trimmer nearest the rear of the chassis is

the 456 kc wave trap. The oscillator coils for the broadcast and short-wave bands are wound on one form and mounted underneath the

chassis deck near the variable condenser. The trimmers for these coils are accessible through holes in the top of the chassis. The trimmer nearest the front of the chassis is for the short-wave oscillator coil and the trimmer farthest from the front is for the broadcast oscillator coil.

l -f and Wave -trap Alignment Rotate the wave -band switch to the broadcast (clockwise) position. Set the variable condenser at the minimum

capacity position and feed 456 kc, through a 0.02 mf paper condenser, to the grid cap of the 6A7 tube (do not remove the grid clip from the tube). Adjust the four i -f trimmers for maximum response. Feed 456 kc to the antenna through a standard dummy antenna and adjust the wave -trap trimmer for minimum response. (See General Notes.)

Short -Wave Alignment (Alignment of the short-wave band should precede broadcast alignment)

Rotate the wave -band switch to the short-wave (counter -clockwise) position, and set the dial pointer exactly at t> megacycles. Feed 6,000 kc to the antenna and adjust the short-wave oscillator trimmer for maximum response, and then adjust the short-wave antenna trimmer for maximum response. Be very careful to choose the minimum capacity peak on the oscillator trimmer.

Broadcast Alignment Rotate the wave -band switch to the broadcast position (clockwise) and set the dial pointer at 60. Feed 600 kc through

a standard dummy antenna. Adjust the broadcast series padding condenser for maximum response. Move pointer to 160,

feed 1600 kc and adjust the broadcast oscillator trimmer for maximum response and then adjust the broadcast antenna trimmer for maximum response. Return pointer to 60, feed 600 kc and readjust the series padding condenser rocking the variable condenser for maximum response.



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MODEL AE163 Chassie AE Voltage,Alignment Notes

EMERSO\ RADIO & PILO\O. CORP.

GENERAL NOTES

1. If replacements are made or the wiring distributed in the r -f section of the circuit, the receiver should be carefully re -aligned.

2. One side of the power line is directly grounded to the chassis base. Under no circumstances, therefore, should a

ground wire be permitted to come in contact with any metal part of the receiver.

3. The filament dropping resistor (R12-see schematic) is in a special metal tube at back of the chassis. This tube will, therefore, become quite hot under normal operating conditions. For voltage drop see below.

4. When operating the receiver on d.c. it may be necessary to reverse the line plug for correct polarity.


Tube Data

The tube complement is as follows: 1-6A7 pentagrid oscillator -modulator. 1-6D6 first i -f amplifier. 1-6Q7G diode detector, audio amplifier, automatic volume control. 1-25L6 pentode power output. 1-25Z5 dual half -wave rectifier. 1-3CR-241 ballast tube.

VOLTAGE ANALYSIS

Readings should be taken with a 1000 ohms -per -volt meter. Voltages listed below are from point indicated to ground

(chassis) with the volume control turned on full and no signal. Line voltage for these readings was 117.5 volts, 60

cycles, a.c. Tube Plate Screen Osc. Plate Cathode Fil. 6A7 100 50 100 2.4 6.3

6D6 100 100 - 3.8 6.3

6Q7G 45 - 1.1 6.3

25L6 96 100 6.4 26.0

Voltage across speaker field -30 volts. Overall voltage drop across ballast tube, (See R12, schematic) -49 volts at .3 amps. Voltage drop across the pilot light section of ballast tube -4 volts, a.c.

ADJUSTMENTS

An oscillator with frequencies of 456 kc and 1500 kc should be used.

An output meter should be used across the voice coil or output transformer for observing maximum response.

Always use as weak a test signal as possible.

Location of I -f Transformers and Trimmers

The first i -f transformer, part number 4ET-350, is in an oblong coil can located on the top of the chassis directly behind the 6A7 tube. The two trimmers for this i -f are accessible through holes in the top of the coil can.

The second i -f transformer, part number 4ET-351 is in an oblong coil can located on top of the chassis directly behind the speaker. The two trimmers for this i -f are accessible through holes in the top of the coil can.

The oscillator and antenna trimmers are located on the variable condenser. The oscillator trimmer is on the rear section of the variable condenser and the antenna trimmer is on the front section of the variable condenser.

Alignment Procedure

1. Rotate the variable condenser to the minimum capacity position.

2. Feed 456 kc to the grid cap of the 6A7 tube, through a .02 mf paper condenser.

3. Adjust the i -f trimmers, repeating for maximum response.

4. Set the dial pointer to 1500 and feed 1500 kc to the antenna lead through a standard dummy antenna. (A .0001

mf mica condenser may be used as a substitute.)

5. Adjust the oscillator trimmer (on rear section of variable condenser) for maximum response.

6. Adjust the antenna trimmer (on front section of variable condenser) for maximum response.



EMERSON PAGE 8-39

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MODEL AL164 Chassis AL Notes,Alignment


Model AL -I64 CHASSIS MODEL AL

Voltage rating 105 to 125 volts a.c. or d.c.

Power consumption 43 watts for receiver and 26 watts for motor

Frequency range 540 to 1580 kc (See paragraph 11 in General Notes below).

GENERAL NOTES 1. If replacements are made or the wiring disturbed in the r -f portion of the circuit, the receiver should be carefully

re -aligned. 2. One side of the power line is directly grounded to the chassis base. Under no circumstances, therefore, should a

ground wire be permitted to come in contact with any metal part of the receiver. 3. The filament dropping resistor (R12 on schematic) is in a special metal tube at the rear of the chassis. This tube

will become quite hot under normal operating conditions. For voltage drop specifications, see below.

4. When operating the receiver on d.c. it may be necessary to reverse the line plug to obtain the correct polarity. 5. The two i -f transformers are held to the chassis by snap -on fasteners. To remove an i -f, unsolder its leads under

the chassis, pinch together the prongs of the snap -on fastener and lift the i -f can from the chassis. 6. The color coding of the i -f transformer leads is as follows:

Grid-green Plate-blue Grid return-black B plus-red

7. The receiver is shipped with an attached antenna wire. In some locations near powerful local stations the addition of a very large antenna may be detrimental to reception, because of the resulting interference. The Emerson Flexible Mast Antenna, Model W-82, has been especially designed for Emerson receivers, featuring compactness and porta- bility while at the same time retaining a high efficiency from the standpoint of performance. Since it functions as an outside antenna the Flexible Mast will substantially improve the receiver performance. Where the Flexible Mast is installed permanently, it is urgently recommended that the receiver antenna wire be cut. Leave just enough of this wire to reach from the receiver to the window strip connector. Instructions for the installation of this compact and efficient outside antenna are supplied with each kit.


9. The phonograph motor has been adjusted at the factory, to turn at a speed of 78 r.p.m. The speed may be checked by counting the turns per minute or by using a stroboscope disc and a neon light (the stroboscope method will only work when the neon bulb is lighted from a 60 cycle a.c. supply).

10. An a.c.-d.c. switch is provided to switch the motor for a.c. or d.c. power supply. It is important that this switch be in the proper position for the power supply available.

11. The receiver in this combination is designed to cover two frequency ranges, but since it is represented as a single band receiver only, the short-wave band, although available, may be ignored.

ADJUSTMENTS

An oscinator with frequencies of 456, 600 and 1400 kc should be used. An output meter should be used across the voice coil or output transformer for observing

The set's oscillator is higher in frequency than the signal, so images should be observed on

of the signals. The last motion in adjusting trimmers should always be a tightening one, not a loosening o

Never leave a trimmer with the outside plate so loose that there is no tension on the screw. up or remove the screw entirely.

Always use as weak a test signal as possible during alignment. Use a .0001 mf mica condenser as a dummy antenna during alignment.

maximum response. the low frequency side

ne. Either bend the plate


The two i -f transformers are in oblong coil cans located on top of the chassis deck. The first i -f transformer is the

one behind the variable condenser. The trimmers for these transformers are accessible through holes in the tops of the

cans. The 456 kc wave -trap is mounted on the right side of the front chassis wall. Its trimmer is accessible at the bottom

of the chassis. The antenna coils for the broadcast and police bands are wound on one form and are mounted underneath the chas-

sis deck below the variable condenser. The oscillator coils for the broadcast and police bands are wound on one form and are mounted on the rear wall

of the chassis deck near the variable condenser. The trimmers for the broadcast antenna and oscillator coils are located on the variable condenser. The trimmer on

the front section is for the antenna coil.

I -f Transformer and Wave -Trap Alignment

Turn the switch clockwise to the broadcast position and rotate the variable condenser to the minimum capacity position. Feed 456 kc to the grid cap of the 6A7 tube and adjust the four i -f trimmers for maximum response. Feed 456 kc to the antenna and adjust the wave -trap trimmer for minimum response.

R -f Alignment With the wave -band switch in the broadcast position, clockwise, set the dial pointer at 140. Feed 1400 kc through a

.0001 mf condenser to the antenna lead and adjust first the oscillator trimmer on rear section of variable condenser) then the antenna trimmer (on front section of variable condenser) for maximum response. The police band is self - tracking and does not require any adjustment.



EMERSON PAGE 8-41 MODELS AT170,AT172

AT181 Chassis AT

O

fl J

The tube complement is as follows: á ` Q U î

1-6A7, pentagrid oscillator -modulator. U El 1-6D6, i -f amplifier. 1-76. diode detector and a.v.c. Voltage rating 105-125 volts, 60

(behind second i -f transformer). Power consumption 55 watts 1-76, audio amplifier. Frequency ranges ... .. 540 to 1730 kc 1-41, pentode power output. PRODUCTION CHANGES 1-80, full -wave rectifier.

Model AR -174 receivers differ from the schematic diagram as follows: a. C27 is a 12 mf, 450 volt dry electrolytic condenser, part no. MC -314. b. C28 is a 24 mf, 400 volt dry electrolytic condenser, part no. 3ZC-341. c. A .25 mf, 200 volt condenser is connected from the screen -grid of the 6D6 i -f amplifier to ground. In receivers bearing serial numbers below 1,200,100:

a. Cl and C2 was a two -gang variable condenser, part no. 4HC-343B and the dial face used with this condenser was part no. 4RZ-580.

EMERSON RADIO & PHONO. CORP, MODELS AR171,AR173

AR174,AR176 AR180,AR185

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42 EMERSON

MODECIS AT170,AT172 Chassis AT

AT181 EMERSON RADIO & PHONO. CORPAutomatic Dial Detail!

BUTTON PIN

NOTCH IN THIN METAL DISC

FIGURE 2

FOR ADJUSTED

MUST ALWAYSC

tebTTED CIRO É

FLOATING VANE' i i

IIII BUTTON READY FOR CHASSIS AR - SEE INDEX FOR SCHEMATIC ADJUSTMENT

Models AT -170, AT -172 and AT -181

CIRCULAR HOUSING

BUTTON PIN

DIRECT IO ROTATED

FACE NUT THIN METAL DISC

BUTTON UNUSED

AUTOMATIC DIAL MECHANISM

nN,1 I mil

I

e PORTION OF STOP VANE VISIBLE BETWEEN CABINET OPENING AND CIRCULAR

OUSING

//LOGE OF CIRCULAI OPENING IN CABINET

THREADED SCREW OF OF RE ITTE E%

IOR FACE Ui FRONTNT PLATE F M i OIT IES

THESE

EDGE OF CIRCI".AR HOUSING

POSITION OF NOTCH FOR UNUSED LONG PN BUTTON

R DIRECTION ROTATED

FIGURE 5

SHOWING TIP OF PIN HITTING VANE FROM EITHER SIDE WHEN STATION IS TUNED IN

V NE

NE

BUTTON

WITH BLANK SPACE NEAR BOTTOM

WITH BLANK SPACE AT LEFT

ARROWS INDICATE DIRECTION. DIAL IS TO BE TURNED FOR ANY

PARTICULAR BUTTON

FIGURE I

FIGURE 3

LARGE NOTCH

UNUSED HOLE NOTICE ITS POSITION WITH RELATION TO ROLES SHOWN IN LINE ABOVE IT BLANK SPACE ON BAKELITE FRONT PLATE MUST COVER THIS UNUSED HOLE

FRONT OF DIAL WITH METAL DISC REMOVED

TIP OF PIN NOTE: TIP OF PIN IS IN LINE WITH LARGE NOTCH

REAR VIEW OF BAKELITE' FRONT PLATE

FIGURE 7

ADJUST BUTTON SO THAT TIP OF PIN IS IN CENTER OF VANE

BUTTON TO BE ADJUSTED

NOTCH IN BUTTON

NOTCH IN THIN METAL DISC

FIGURE 6

DETAILS OF BUTTONS

S BUTTONN CELLU CARLOAD TTAB N LBUTTONN -TIO FIGURE 4

JOINING LINE OF CABINET VENEERS



EMERSON PAGE 8-43 MODELS AT170,AT172

EMERSON RADIO & PHONO. CORP. AT181 Chassis AT Automatic Dial Notes

AUTOMATIC DIAL Models AT -170, AT -172 CHASSIS AR - SEE INDEX FOR SCHEMATIC

Automatic Dial Tuning

Insert theline plug into the electric outlet. Turn the receiver on by rotating the volume control knob clockwise until the switch is heard to click. Wait about a minute for the tubes to warm up.

Be sure the wave -band switch is in the broadcast position, clockwise.

(Complete information relative to the pre-setting of the Auto- matic Dial appears on pages 5 to 7 inclusive in this booklet.)

Tuning with the Automatic Dial is very similar to dialing a telephone except that only one turn of the dial is necessary. Merely push in the button bearing the call letters of the desired station, and, keep- ing the button pressed in firmly, rotate the dial until it stops with the button near the top. The button may then be released. This procedure automatically tunes in the desired station.

The illustrations, Fig. 1, indicate the proper rotation of the dial for a particular button. Note that the button must always stop near the top of the disc. If the button for the desired station is already at the top, rotate the dial in either direction about a quarter turn and then push the button in and rotate the dial back again until it stops with this button near the top. Broadcast Reception

Broadcast stations may be tuned in the regular manner by means of the station selector knob on the front of the cabinet

STATION PRE-SETTING OF AUTOMATIC DIAL

The bakelite front plate for the dial will be found in the knob envelope. This plate is to be assembled after following the procedure described below. Eight cards of station call letter tabs for the buttons are in a separate envelope packed with the receiver.

The illustrations at the right, Fig. 2 and Fig. 3, show the major parts of the automatic dial. Ten buttons are supplied with each dial. Note that there are eleven button holes in the circular housing. One of these button holes is not to be used. (See Fig. 3). Each of the buttons may be set for a particular station. The stations chosen should be the popular local broadcast stations. The dial cannot be used for automatic tuning of short-wave stations. Each button is adjustable in that it can be rotated in its hole in the housing. This rotation is the means of adjustment for any particular station.

First turn the receiver on. The adjustments should be made with the receiver warmed up. Of the possible ten selected local stations choose five of the more desirable and determine their frequencies. Station frequencies will usually be found listed in newspapers. The station with the lowest frequency of the first five chosen should be adjusted first. Compare the frequency of this station with the frequency markings on the tab inserts in the buttons. The station frequency will be between the frequency limits marked on one of the buttons and that button should be adiusted for that particular station.

The following procedure should be observed in adjusting the buttons: 1. Do not remove the thin metal disc which holds

the buttons in the housing until this entire procedure is completely finished. Merely loosen the face nut slightly and rotate the disc until its semi -circular notch falls below the first button to be adjusted. See Fig. 2. (When rotating this disc it is necessary to successively hold each button in place with a finger as the notch in the disc moves past these buttons.) Tighten the face nut again to prevent the disc from falling off. Take out this button and remove the celluloid cap and tab insert by prying with a sharp instrument at the large notch on the side of the button. Tune in the desired station by means of the selector knob on the front of the cabinet.

and AT -181

3. The large notch on the side of the button will indicate the position of the stop pin on the back of the button, see Fig. 4. The tip portion of the stop pin in this drawing is the part that stops against the floating vane. This tip portion in stop- ping against the vane is the action that locates the station once the button is adjusted, see Fig. 5. The vane is visible between the edge of the button housing and the edge of the hole in the cabinet, see Fig. 3.

4. With the station tuned in and without moving the circular housing partially insert the button, lining up the tip portion of the stop pin by eye with the center of the floating vane, and then push the button in, engaging the teeth. See Fig. 6. The center joint of the veneer on the cabinet may be used to assist in this lining up since the joint is approximately at the center of the floating vane. Hold the button in and rotate the thin metal disc a small fraction of a turn, just enough so that it holds the button in place. It is important that when the stop pin is lined up it is either horizontal or pointing at some angle away from the hub of the housing. This precaution may be observed by locating the large notch of the button (which is in line with the tip of the stop pin) outside the dotted circle

through the buttons as shown in Fig. 3. 5. To check if the button has been properly adjusted rotate the entire

housing first in clockwise direction so that the button stop pin is clear of the floating vane. Push the button all the way in with a finger and rotate the housing so that the pin travels toward and stops against the floating vane. The desired station should then be heard. Repeat this procedure on the counter -clockwise side of the vane. The station should again be heard.

6. If the station tunes in perfectly on each side of the vane no further adjustment is necessary. If it does not tune in perfectly, further adjustment should be made by carefully pulling out the button and rotating it one notch in the housing in the direction which will bring in the station more accurately. Check the tuning again by following the procedure outlined in paragraph No. 5. Find the station call letters for this button on one of the cards supplied. Remove the tab from the card and insert in the button by pressing in firmly. Replace the clear celluloid cap over the call letter tab, snapping it firmly in place.

7. Adjust four buttons for the other four selected stations following the procedure outlined above. In adjusting these buttons care should be taken, when rotating the thin metal disc, to keep the other

buttons from falling 8. The remaining buttons, five in number, may be adjusted for any

other local stations easily obtainable, or left in reserve for future settings.

9. After the buttons are all adjusted the thin metal disc should be re moved carefully by unscrewing the face nut and replaced by the bakelite front plate. Be very careful in removing the thin metal disc that the tuttons do not spring out from the housing.

The cabinet should he tilted or placed mi its back, when placing the bakelite plate on the dial, to make sure that the buttons do not fall out. Check carefully the drawings in Fig. 3 and Fig. 7 for aligning the bak elite front plate with the circular housing. The plate must fit in easily and snugly. Care should be taken not to damage the locating pins on the back of the front plate. The following additional precautions must be observed when adjust ing the buttons:

The long pin buttons, when adjusted, should have the long length of the pin nearly horizontal. If these long pins, after the button is adjusted,, interefere with any other part of the mechanism when the housing is rotated the buttons cannot be used in these holes.

If no special use is found for the two long pin buttons it is preferable to insert these in unused holes with the pins pointing directly toward the hub of the housing.

When loosening the thin metal disc be sure the face nut is unscrewed only enough to allow the disc to turn. During adjustments check this nut frequently to make sure it is in no danger of falling off. It cannot be emphasized too strongly that the utmost care must be taken to prevent this metal disc or the bakelite front plate from falling off and allowing the adjusted buttons to spring out from the housing. When making adjustments, rotate the thin metal disc very carefully to be sure that the adjusted buttons do not fall out of the housing past the notch in the disc.

After replacing the thin metal disc with the bakelite plate, the disc should not be discarded but should be reserved for future use in resett ing buttons or in the event the receiver is reshipped. The receiver should never be transported with the bakelite plate assembled. Note:-Two of the ten buttons supplied with the dial have long pins. in rare cases

a particular station cannot be reached with a short pin button. The two long pin buttons are available for this purpose.



44 EMERSON

1,10DEL S AR171,AR173 AR174,AR176 EMERSON RADIO AR180,AR185

Chassis AR Alignment,Notes,Parts

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EMERSON PAGE 8-45

.944. OUTPUT

TRANSFORMER ON SPEAKER

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46 EMERSON

1/10D MS AF171,AF173,AF176 AF179,AF180,AF185 EMERSON RADIO & PHONO. CORP.

Chassis AF Alignment,Sotes ADJUSTMENTS

An oscillator with frequencies of 456, 600, 1600 and 15,000 kc should be used. An output meter should be used across the voice coil or output transformer for observing maximum response. If the circuit is at all disturbed, both the broadcast and short-wave bands must be realigned. The set's oscillator is higher in frequency than the signal, so images should be observed on the low frequency side

of the signals. Always choose the minimum capacity peak on oscillator trimmers and maximum capacity peaks on antenna trim-

mers. The last motion in adjusting trimmers should always be a tightening one, not a loosening one. Never leave a trimmer with the outside plate so loose that there is no tension on the screw. Either bend the plate




The three i -f transformers are in oblong coil cans located on top of the chassis deck. The first i -f transformer, part number 4ET-350B, is located to the left of the variable condenser. The second i -f transformer, part number 4ET-350B, is located behind the variable condenser. The third i -f transformer, part number 4FT-382, is located to the right of the variable condenser. The trimmers,

two for each transformer, are accessible through holes in the top of the cans. The broadcast series padder is located underneath the chassis (in the corner near the 106 tube). The screw adjust-

ment is accessible through a hole in the top of the chassis. The antenna coil for the two bands is wound on one coil form and mounted underneath the chassis to the right of

the variable condenser. The trimmers are accessible through holes in the top of the chassis. The trimmer nearest the front of the chassis is for the short-wave antenna coil.

The r -f interstage coils for the two bands are wound on one form and mounted underneath the chassis to the left of the first i -f transformer. The trimmers are accessible through holes in the top of the chassis. The trimmer nearest the front of the chassis is for the short-wave interstage coil.

The oscillator coils for the two bands are wound on one coil form and mounted underneath thé chassis to the left of the variable condenser. The trimmers are accessible through holes in the top of the chassis. The trimmer nearest the front of the chassis is for the short-wave oscillator coil.

l -f Alignment Rotate the wave -band switch to the broadcast (clockwise) position. Set the variable condenser at the minimum

capacity position and feed 456 kc through a 0.02 mf paper condenser, to the grid cap of the 106 tube (do not remove the grid clip from the tube). Adjust the six i -f trimmers for maximum response.

Short -Wave Alignment (Short-wave alignment should precede broadcast alignment.)

Set the wave -band switch at the short-wave (counter -clockwise) position. Move pointer to 15, feed 15,000 kc to antenna (using a 400 ohm dummy antenna) and adjust the short-wave oscillator for maximum response. If two peaks are obtained choose minimum capacity peak. Then adjust the interstage and antenna trimmers for maximum response. If two peaks are obtained choose the maximum capacity peak.

Broadcast Alignment With the wave -band switch at the broadcast (clockwise) position, set the pointer at 600, feed 600 kc through the

antenna (using a standard dummy antenna), and adjust the broadcast series padder for maximum response. Move pointer to 1600, feed 1600 kc to the antenna and adjust the oscillator trimmer for maximum response, then adjust inter - stage and antenna trimmers. Reset the pointer to 600, feed 600 kc to antenna and rock the variable condenser (rotate the condenser back and forth through a small arc) while resetting the oscillator padder for maximum response. Return to 1600 and check alignment. If readjustment is necessary, return to 600 and repeat entire procedure.

1. The battery complement should be as follows: Battery Manufacturer

Eveready Burgess Ray -o -vac Type No. Required Part No. Part No. Part No.

3 volt "A" 1 X-125 or A-600 20F2 P9403 46 volt "B" 3 ' 385 (plug-in type) 22308 (plug-in type) P9303 (plug-in type)

2. The receiver is designed for an "A" supply of 2 to 3 volts. A 2 volt storage battery may be used, in which case the 1E1 (ballast) tube, in the chassis becomes unnecessary and may be eliminated as follows:

If it is definitely known that a 2 volt storage battery will always be used it is permissable and advisable to short-circuit the two heavy prongs on the 1E1 tube by connecting them with a short piece of bare wire. Be sure that the two small prongs on the tube are free of this bare wire.


4. Note that all leads in the battery cable are color coded. The two "A" leads are tagged with small metal markers giving the polarity. The battery cable is equipped with three plugs for "B" battery connections. These plugs are all alike and may be inserted in any order in the sockets of the three "B" batteries. The color coding of the battery cable is as follows:

Red B plus 135 Brown B plus 67.6 Blue B neg. Yellow A plus 3 Black A neg.

5. If replacements are made in the r -f section of the circuit, the receiver should be carefully re -aligned.

6. Be very careful not to remove any of the tubes from their sockets with the power switch turned on, as the rapid rise in filament voltage will damage the remainder of the tubes.



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50 EMERSON

MODEL AS179 Chassis AS Alignment,Notes,Voltage

EMERSON RADIO & PIIONO. CORP.

ADJUSTMENTS An oscillator with frequencies of 456, 600, 1600 and 15,000 kc should be used. An output meter should be used across the voice coil or output transformer for observing maximum response. If the circuit is at all disturbed, both the broadcast and short-wave bands must be realigned. Never leave a trimmer with the outside plate so loose that there is no tension on the screw. Either bend the plate




The first i -f transformer, part number 4ET-350C, is located on top of the chassis to the left of the variable condenser. The second i -f transformer, part number 4ET-350A is located on top of the chassis behind the variable condenser. The third i -f transformer, part number 4FT-382B, is located on top of the chassis to the right of the variable

condenser. The trimmer condensers, two for each transformer, are accessible through holes in the top of the cans. The adjustable padding condenser for the broadcast band is mounted underneath the chassis (in the corner near the

6D8G tube) with the screw adjustment accessible through a hole in the front of the chassis. The antenna coils for the broadcast and short-wave bands and the 456 kc wave -trap are wound on one form and

mounted underneath the chassis deck directly behind the adjustable padding condenser. The trimmers for these coils are accessible through holes in the top of the chassis. The trimmer nearest the front of the chassis is the broadcast antenna trimmer. The central trimmer is the short-wave antenna trimmer. The 'trimmer nearest the rear of the chassis is the 456 kc wave -trap.

The oscillator coils for the broadcast and short-wave bands are wound on one form and mounted underneath the chassis deck near the variable condenser. The trimmers for these coils are accessible through holes in the top of the chassis. The trimmer nearest the front of the chassis is for the short-wave oscillator coil and the trimmer farthest from the front is for the broadcast oscillator coil.

l -f and Wave -trap Alignment Rotate the wave -band switch to the broadcast (clockwise) position. Set the variable condenser at the minimum

capacity position and feed 456 kc through a 0.02 mf paper condenser to the grid cap of the 6D8G tube (do not remove the grid clip from the tube). Adjust the six i -f trimmers for maximum response. Feed 456 kc to the antenna through a

standard dummy antenna and adjust the wave -trap trimmer for minimum response. (See General Notes.)

Broadcast Alignment Rotate the wave -band switch to the broadcast position (clockwise) and set the dial pointer at 600. Feed 600 kc through

a standard dummy antenna. Adjust the broadcast series padding condenser for maximum response. Move pointer to 1600,

feed 1600 kc and adjust the broadcast oscillator trimmer for maximum response and then adjust the broadcast antenna

trimmer for maximum response. Return pointer to 600, feed 600 kc and readjust the series padding condenser, rocking

the variable condenser for maximum response. The set's oscillator is higher in frequency than the signal on the broadcast band, so images should be observed on

the low -frequency side of the signals.

Short -Wave Alignment Rotate the wave -band switch to the short-wave (counter -clockwise) position, and set the dial pointer exactly at 15

megacycles. Feed 15,000 kc to the antenna through a 400 ohm non -inductive resistor and adjust the short-wave oscillat-

or trimmer for maximum response, and then adjust the short-wave antenna trimmer for maximum response. Be very

careful to choose the maximum capacity peak on the oscillator trimmer. The set's oscillator is lower in frequency than the signal (on the short-wave band only), so images should be ob-

served on the high frequency side of the signal.

1. The large, oblong metal box behind the speaker contains the power pack. The function of this power pack is to con- vert the 6 volt direct current from the storage battery into 150 volt direct current. The vibrator used is of the syn- chronous type.

2. The wave -trap in the receiver has been adjusted for maximum signal rejection at 456 kc. If, however, persistent in-

terference is experienced from some particular telegraphic station, readjust the wave -trap trimmer until the response from the interfering station is at a minimum.

3. Particular care should be taken in connecting the battery to the receiver. The heavy battery cable emerging from the rear of the receiver terminates in two separate leads with clips attached. Note that the clip at the end of the red

rubber covered lead is marked with a plus sign (+). This clip should be attached to the positive terminal of the six - Volt storage battery. The other clip, on the braid covered lead should be attached to the negative terminal of the storage battery. It is important to observe the proper polarity in connecting the battery. Reversed connections with the receiver turned on will result in serious damage to the receiver.

4. Make certain that all battery connections make good contact, otherwise the receiver may be noisy. The positive terminal of an unmarked battery may be distinguished by a deposit of green corrosion, which usually collects on this terminal. On most batteries the positive terminal is larger than the negative terminal.

5. The color coding of the leads of the i -f transformers is as follows: Grid-green Plate-blue Grid return-black B plus-red

6. With few exceptions the color coding of the general wiring is as follows: Plate-blue Cathode-white or yellow B plus-red Grid-green Screen-brown Filament and ground-black

7. The color coding of the leads of the power pack is as follows: A plus-blue B plus-red Common neg.-shield

The receiver may be quickly and easily adapted for operation from a 32 volt power supply. A complete kit, Model

W-95, containing the additional parts required for this conversion may be purchased through Emerson dealers. Com-

plete instructions for attaching these additional parts are supplied with each kit.

Readings should be taken with a 1,000 ohms -per -volt meter. Voltages listed below are from point indicated to chassis

with volume control turned on full and no signal. Battery voltage for these readings was 6.1 volts. Tube Plate Screen Cathode Ose. Plate

6D8G ooc.-mod. 6S7G 1st i -f 6S7G 2nd i -f 6Q7G 2nd detector 41 output

150 60 4 120 150 60 4 - VOLTAGE 150 95

60 - 4 1.4 - - ANALYSIS

145 160 10.5

© John F. Rider, Publisher


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FADA RADIO & ELECTRIC CO MODEL 211(Late) Alignment,Changea Socket, Trimmers

_( LA °=`" ` SOCKET The Schematic of the EARLY model on 1111111111111M»"" page 7-3 is the same as the latest

a . model with the exception,Ref.No.54 ma was.00093 Mf, changed to .0007 MF, (sol me" ---I MICA , the latter value shunted by

+++ 6G5 Ref .No. 89, Padding Condenser of 110 rz e. ü to 250 MMF.

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ALIGNMENT TABLE

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GENERATOR CON. TO

ADJUST TRIMMER

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CG of IF T15,T14

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MODEL 242 Schematic



10 FADA

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FADA RADIO & ELECTRIC CO.

ALIGNMF,NT TABLE

MODEL 242 MODEL 246 Alignment Socket,Trimmers

WAVE BAND

DIAL FREQUENCY

GENERATOR FREQUENCY

IMAGE FREQUENCY

DUMMY ANTENNA

GENERATOR CONNECTED

TO

ADJUST TRIMvIER

B.C. 1000 KC 456 KC ___ .001 mfd. 50,000 ohms

Control grid of 1A4 tube

T -8,T-7

B.C. 1000 KC 456 KC -__ .001 mfd. 50,000 ohms

Control grid of 106 tube

T -6,T-5

S.W. 4.5 MC 4.5 MC 3.6 MC 400 ohm resistor

Yellow antenna lead

T -3,T-1

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Yellow antenna lead

Check Sensitivity

B.C. 1500 KC 1500 KC ___ 200 mmfd. condenser

Yellow antenna lead

T -4,T-2

B.C. 600 RC 600 KC ___ 200 mmfd. condenser

Yellow antenna lead

T-9*

*To insure perfect alignment it is necessary to "rock" the ganged variable condenser in order to follow the maximum signal output.

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12 FADA

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SPEAKER D.C. RESISTANCE VALUES PART NO -FIELD COIL-AUDIO TRAMS. PRI -AUDIO TRANS. SEC.-V.C.

105.27 - 1500 *(cCLo) -- 650 ohms 105.37 -Â1500 * - 400 ohms

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FAI)A RAI)IO & l',l.h,C'l'RIC CO

1'AllA PAGN. 8-17

MODELS 267,267SD,267SG 267SF Motoset

Schematic Voltage



18 FADA

MODELS 267,267SD 267SG,267SF Loto set

Socket, Trimtne r s

Al i gnment ,Parts

PRICES SUBJECT TO CHANGE WITHOUT NOTICE


SEPARATE SPEAKERS: Model 267 MOTOSET is also available for

use with separate speakers instead of the standard 61/2 inch speaker

supplied with the standard set. These combinations are available

as follows:

MODEL 267 SD is a two unit receiver in which the speaker is an

8 inch dynamic in a large housing of its own. This housing mounts

on the bulkhead by a single large bolt, and plugs into the recept-

acle provided for this purpose on the side of the case, near the

front. MODEL 267 SG is a two uni+ receiver similar to 267 SF, with

header speaker for installation in 1936 General Motor Cars.

Dial Frequency

1,000 KC

1,500 KC

600 KC

ALIGNMENT TABLE Generator Frequency

175 KC

1,500 KC

600 KC

Dummy Generator Adjust

Antenna Connected To Trimmer

.001 mid. Control grid T-1, T-2

50,000 ohms of 6A7 tube T-3

200 mmfd. Antenna lead T-4, T-6,

condenser socket T-8

200 mmfd. Antenna lead T-55

condenser socket T-8

MODEL 267 SF is a two unit speaker for installation behind the

the same receiver header panel in 1936-37 Ford Cars

as above, but a separate radio employing

unit

*To insure perfect alignment, it is necessary to "rock" the ganged variable

condenser in order to follow the maximum signal output.

PARTS PRICE LIST

PART

NO. 10.3 Capacitor - tubular - (.006 mfd. - 400 Volts)

10.4 Capacitor - tubular - (.01 mfd. - 200 Volts)


10.7 Capacitor - tubular - (.05 mfd. - 400 Volts) - -

10.10 Capacitor - tubular - (.01 mfd. - 4Q0 Volts) _ -


10.22 Capacitor - generator - (.5 mfd. - 120 I mfd.ot)400 V.)

10.32 Capacitor - block 25 (.5 mfd. 200 V., .25 mfd. 200 V.)

- tubular - (.004 mfd. - 400 Volts)

- tubular - (.004 mfd. - 1,600 Volts)

- mica - (.00025 mfd. - 10%)

- mica - (.00024 mfd. - 5%) - mica - (.00026 mfd. - 5%)

.25 - mica - (.0002 mfd. - 10%)

r - mica - (.00076 mfd. - 3%) .25

- electrolytic (Dual 8 mfd. 350 W.V.) 1.55

- variable gang 4.10

- padder .30 carbon - (50,000 ohms 1/3W 10%) .20

carbon - (250,000 ohms 1/3 W 10%) .20

carbon - (250,000) ohms 1/3 W 20%) .20

carbon - (1,000,000 ohms 1/3 W 20%) .20

carbon - (500,000 ohms 1/3 W 20%) .20

carbon - (100,000 ohms 1/3 W 20%) .20

distributor suppressor - (15,000 ohms) .35

carbon - (30,000 ohms 1 W 10%) .25

carbon - (20,000 ohms 1/3 W 10%) .20

- carbon - (20 ohms 1/3 W 10`/) .20

carbon - (600 ohms 1/3 W 10'/) .20

- carbon - (30,000 ohms 1/3 W 20%) .20

- carbon - (650 ohms 1/3 W 10%)._ .20

DESCRIPTION

10.33 Capacitor 10.34 Capacitor 15.1 Capacitor 15.33 Capacitor 15.52 Capacitor 15.54 Capacitor 15.70 Capacito 20.59 Capacito 25.63 Capacito 25.100 Capacito 30.3 Resistor -

30.4 Resistor -

30.20 Resistor -

30.22 Resistor -

30.23 Resistor -

30.24 Resistor -

30.27 Resistor -

30.56 Resistor -

30.58 Resistor -

30.81 Resistor 30.82 Resistor -

30.83 Resistor 30.87 Resistor 35.36 35.37 35.38 35.39 35.40 35.41 35.42

Coil - antenna Coil R. F.

Coil - oscillator Spark filter choke R. F. Choke Coil R. F. Choke Coil 1st I. F. Transformer

LIST PART

PRICE NO.

T-3(455,4 '41D IC`1F TRANS/

T-2 (S¿NC )

ALIGNMENT LAYOUT

PARTS PRICE LIST

DESCRIPTION

NOT A BATTERY CONNECTOR

VOLUME

CONTROL

T -s (6o0 I(C )

STATION SELECTOI

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ANTENNA

LIST

PRICE

.20 35.43 2nd I. F. Transformer 1.50 .50 .50 .75

3.50 1.30 .85

1.05 55.14 Tone control - (100,000 ohm) 65 65.2 Socket - (6A7)

20 65.4 Socket - (75) 25 65.17 Socket - (78) 25 65.18 Socket - (41 )

.25 65.19 Socket - (84)

.25 65.46 Socket - (vibrator) 65.61 Socket - (external speaker) 75.119 Remote control cable - (station selector) 75.120 Remote control cable - (volume control) 75.122 Volume control unit - (with switch) 75.123 Tuning control unit 80.11 Tube shield - (two sections) 80.13 Tube shield base 80.14 Tube shield' retaining ring 80.16 Tube shield cap 90.2 Cup washer 90.3 Rubber grommet - (Dia. 11/16" Hole 13/32") 90.15 Antenna cable 90.18 Mounting bolt - (5/16" - 18 Thd. x 31/2" L) .04

90.31 Pilot light - (6 volt) 90.54 Grid cap 90.63 Vibrator 90.107 Washer - (7/8" x 1/16" x 11/32" Hole) 90.108 Lockwasher - (11/16" O. D. x 3/32")

110 90.110 Hex nut - (5/16" - 18 Thd.) 1.15 90.153 Speaker cable .75 90.160 Grounding clips - (per doz.) -25 90.159 Vibrator grounding cup .50 90.235 Fuse - 15 Amp. ...

-25 105.68 Speaker - (Model 267) 1.30 140.14 Knob - (tone control)

.20 35.50 "A" Choke .20 35.51 R. F. Choke .

'20 40.IC Choke coil - filter (330 ohm) -

'20 40.56 Power transformer

.40 40.57 Output transformer 50.31 Volume control - (I meg.)

.15

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FADA PAGE 8-19

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FAIR. -MORSE PAGE 8-1

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2 FAIR -MORSE

I.OD a5 S 5C, GA

Alignment,Voltage FAIRBANKS, MORSE & CO. Resistance

ALIGNMENT The models 5C and 6A are AC operated, superheterodyne chassis low range AC voltmeter, preferably about 0-15 volts. It should be con -

with automatic volume control. These receivers operate on three bands nected from the plate of the 6F6G tube to ground with a .1 mfd. con-

-broadcast, police -amateur, and short wave, Figure 4. The 6A has the denser in series with one of the leads. When the hand tends to go off

tuning eye, Figures 3 and 4; the 5C does not. Otherwise, the two chassis scale, reduce the input from the signal generator and keep the volume

are identical. control at maximum. If too strong a signal is fed to the retetver and the

Alignment procedure is given below in chart form, Figures 1 and 2. volume control is used to keep the output meter hand on scale, the

Make adjustments in the order given. The output meter may be any A. V. C. will operate and inaccurate alignment will result.

Ne. Connect

Generator To

Signal Generator Frequency

Dummy Range Switch

Dial Setting Stage

Trimmer No.

AFC Switch

Peak For

Special Instructions

1 6A8G Grid 456 KC .1 mfd. Condenser

Broadcast 530 KC 2nd IF 1 Max.




Broadcast 530 KC 1st IF 3 Max.


Broadcast 530 KC 1st IF 4 Ma..

5 Antenna 456 KC 400 ohm Resistor

Broadcast 530 KC Wave Trap

5 Min. Raise input un til signal is heard.

6 Antenna 5.4 MC 400 ohm Resistor

Police Amateur

5.4 MC Police Osc.

6 Max.


Police Amateur

5.4 MC Police Det.

7 Max.


Police Amateur

1.8 MC Police Osc.

8 Maz. *While rocking - Repeat 6, 7 and 8 until no

change is noted.

9 Antenna 1500 KC 200 mmfd. Condenser

Broadcast 1500 KC B. C. Osc.

9 Max.

10 Antenna 1500 KC 200 mmfd. Condenser

Broadcast 1500 KC B. C. Det.

10 Max.

Il Antenna 600 KC 200 mmfd. Condenser


11 Max. While rocking , - Repeat 9, 10 and 11 until no change is noted.

12 Antenna 18 MC 400 ohm Resistor

Short Wave

18 MC S. W. Osc.

12 Max.


Short Wave

18 MC S. W. Det.

13 Maz.


Short Wave

6 MC Check calibra - tlon at 6 MC- Padder is fixed.

FIGURE 2

ALIGNMENT CHART

OHMS VOLTS 6A8G VOLTS OHMS OHMS VOLTS 6F6G VOLTS OHMS OHMS VOLTS 6K7G VOLTS OHMS

255 150M INF. 106 2.15 210 INF. 210 18.2 35M INF. - .10

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-.05 NOT USED ON

MODEL 5C 500M

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255 0 0 0 .5 6.3 Ac 0 0 0 0 ---i' INF.

'CONNECTED TO TARGET THRU 1 MEGOHM RESISTOR 30 VOLT SCALE o3 VOLT SCALE

VOLTAGE AND RESISTANCE ANALYSIS CHART

JJohn F. Rider, Publisher



FAIRBANKS. MORSE & CO.

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'John F. Rider, Publisher


4 FAIR. -MORSE

MODEL 5D

Alignment, Socket FAIRBANKS, MORSE & CO. Trii,uners

The model 5D is a battery operated superhetrodyne with with a .1 mfd. condenser in series with one of the leads. Set the

automatic volume control. It receives signals on three bands- volume at maximum during the alignment and as the meter'

broadcast, police -amateur, and short wave. hand tends to go off scale, decrease the output from the signal

Alignment procedure is given below in chart form, figures generator. If too strong a signal is fed to the receiver and the

1 and 2. Make adjustments in the order given. The output meter volume control is used to keep the output meter hand on scale,

may be any low range AC voltmeter, preferably about 0-15 volts. the AVC will operate and inaccurate alignment will result.

It should be connected across the two plates of the 1j6G tube

BAND TONE VOLUME CONTROL SW ITCH CONTROL & SWITCH o --Yee. TUNING

O i F 7

III l'H4G BROADCASTo SHORT NAVE

TO%3 O>e I I -O POLICE T'

BROADCAST

I!!1OSCILLATOR OSCILLATOR TRIMMERS PAODERS

C7G 8 IJ6G TRI MMERS ON FRONT OF CHASSIS

BROADCASTS O I D5G NAVE

SHORT NAVE ©©©0 TRAP 12 -e... POLICE 5

ANTENNA- BLUE 1

BATTERY, TO GROUND -BLACK CABLE SPEAKER

6

ANTENNA TRIMMERS

TRIMMERS ON SIDE OF CHASSIS Figure 4

TOP, FRONT AND END VIEWS OF THE 5D CHASSIS SHOWING LOCATION OF TRIMMERS, CONTROLS AND COMPONENT PARTS

No. Connect

Generator To


Dummy Range Switch

Dial SettingNo. Stage Trimmer AFC Switch

Peak For


I 6A8G Grid 456 KC .1 mfd. Condenser

Broadcast 530 KC 2nd IF i

1 Max.

6A8G Grid 456 KC .1 mfd. Condenser


T 6A8G Grid 456 KC .1 mfd. Condenser


4 6A8G Grid 456 KC 1 mfd. Condenser


5 Antenna 456 KC" 400 ohm Resistor

Broadcast 530 KC Wave Trap

5 Min. Raise input un - til signal is

heard. 6 Antenna 5.4 MC 400 ohm

Resistor Police Amateur

5.4 MC Police Osc.

6 Max.


Police Amateur

5.4 MC Police Det.

7 Max.


Police Amateur

1.8 MC Police Osc.

8 'Max. While rocking - Repeat 6, 7 and 8 until no

change is noted. 9 Antenna 1500 KC 200 mmf.

Condenser Broadcast 1500 KC B. C.

Osc. 9 Max.

10 Antenna 1500 KC 200 mmf. Condenser

Broadcast 1500 KC B. C. Det.

I0 Max.

11 Antenna 600 KC 200 mmf. Condenser


11 Mao. "While rocking - Repeat 9, 10 and 11 until no change is noted.


Short Wave

18 MC S. W. Osc.

12 Max.


Short Wave

18 MC S. W. Det.

13 Max.

14 Antenna

-

6 MC 400 ohm Resistor

Short Wave

6 MC S.W. Pad.

' Check calibra -

tion at 6 MC- Padder is fixed.

Figure 5

ALIGNMENT PROCEDURE CHART




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6 FAIR. -MORSE

MODEL 6C Alignment,Voltage Resistance


The model 6C is a six -volt battery operated superhetrodyne with automatic volume control and tuning eye. It receives signals on three bands-broadcast, police -amateur, and short wave.

Alignment procedure is given below in chart form, figures 1 and 2. Make adjustments in the order given. The output meter may be any low range AC voltmeter, preferably about 0-15 volts. It should be connected across the two plates of the

1 J6G tube with a .1 mfd. condenser in series with one of the leads. Set the volume at maximum during the alignment and as the meter hand tends to go off scale, decrease the output from the signal generator. If too strong a signal is fed to the receiver and the volume control is used to keep the output meter hand on scale, the AVC will operate and inaccurate alignment will result.

Figure 1

TOP VIEW, FRONT VIEW AND END VIEW OF THE CHASSIS SHOWING THE LOCATION OF TRIMMERS, CONTROLS TUBES AND COMPONENT PARTS

Ne. Connect

Generator To


Dummy Range Switch

Dial Setting

Stage Trimmer No.

AFC Switch

Peak For


2

3

6A8G Grid

6A8G Grid

6A8G Grid

456 KC

456 KC

456 KC

.1 mfd. Broadcast Condenser .1 mfd. Broadcast Condenser .1 mfd. Condenser

Broadcast

530 KC

530 KC

530 KC

2nd IF 1

2nd IF 2

1st IF 3

Max.

Max.

Max.

4

5

6A8G Grid

Antenna

456 KC

456 KC

.1 mfd. Condenser 400 ohm Resistor

Broadcast

Broadcast

530 KC

530 KC

1st IF 4

Wave Trap

5

Max.

Min. Raise input until signal is heard.

6

7

8

Antenna

Antenna

Antenna

5.4 MC

5.4 MC

1.8 MC

400 ohm Police Resistor Amateur 400 ohm Resistor 400 ohm Resistor

Police Amateur Police Amateur

5.4 MC

5.4 MC

1.8 MC

Police Osc. Police Det.

6

7

Police 8 Osc.

Max.

Max.

Max. While rocking. Repeat 6, 7 and 8 until no change is noted.

9

IO

11

Antenna

Antenna

Antenna

1500 KC

1500 KC

600 KC

200 mmf. Condenser 200 mmf. Condenser

Broadcast

Broadcast

200 mmf. Broadcast Condenser

1500 KC

1500 KC

600 KC

B. C. Osc. B. C. Det.

9

10

B. C. 11

Osc.

Max.

Max.

Max. While rocking. Repeat 9, 10 and 11 until no change is noted.


Short Wave

13

14

Antenna

Antenna

18 MC

6 MC

400 ohm Short Resistor Wave 400 ohm Resistor

Short Wave

18 MC

18 MC

6 MC

S. W. 12 Osc.

Max.

S. W. 13 Dec.

Max.

Check calibration at 6 MC. Padder is fixed.

Figure 2


OHMS VOLTS 608G VOLTS OHMS OHMS VOLTS/ 15 VOLTS OHMS OHMS VOLTS 617G VOLTS OHMS

INF. 83 -.624 41M 83 INF. 450M -.15 .15. 450M

i ' 85 INF. 0O O INF. 125 O

O 125MEG 9 Q- .05' 1MEG INF. 58 O

O O 0ili .3 " 35014 0 0 1' f^

re 6.3 1.5 .

INF. 127 1.25 450 0 0 6.3 1.5 rJ

1.31 135 1.5 2.2 4.1 2.5 0 0 " 0 0

a

OHM VOLTS 6L5G VOLTS OHMS OHMS %OLT 6N5 VOLTS OHMS OHMS VOLTS 1J69 VOLTS OHMS

0 130M 1MEG 0 126 INF. 240 0 0 260

INF. 225 O V @ o

0 INF. 136

O 136 INF.

© O o fJ O0 CH CH

1.5 6.3 0 0

- 0\./ C

4.2 1100 1.5 6.3 0 0

*3 VOLT SCALE e CONNECTED TO TARGET (T) THRU 1 MEGOHM. RESISTOR IN SOCKET

Figure 5

VOLTAGE AND RESISTANCE ANALYSIS CHART




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8 FAIR. -MORSE

MOD EL 8A

Ali gnme nt ,Vol tage Resistance, Socket Trimmers

RANGE 3W TCH

TUNING

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6L7G

--POWER CORD


SWITCH & TONE CONTROL

VOLUME CONTROL

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10 FAIR. -MORSE

MODEL 9A Socket,Trinners FAIRBANKS, MORSE & Co. Alignment, Voltage Resistance

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X AUTOMATIC DIAL ADJUSTMENT sAn AS GIVEN FOR e THE L'OD13.. 12A (see index) ALIGNMENT NOTES

Ñ OF I OUL 12A ALSO APTLY TO THIS MODEL


No. Connect

Generator To


Dummy Antenna

Range Switch

Dial Setting Stage

Trimmer No.

AFC Switch

Peak For

Special instructions

I 6L7G Grid 456 KC I Mid. Condenser

Broadcast 550 KC Disc. I Out Max.

2 6L7G Grid 456 KC .I Mid. Condenser

Broadcast 550 KC Disc 2 Out Max.

3 6L7G Grid 456 KC .1 Mfd. Condenser

Broadcast 550 KC Disc. 16 Out Man.

4 617G Grid _456 KC .1 Mfd. Condenser

Broadest 550 KC 1st IF 3 Out Max.

5 6L7GGrid 456 KC .1 Mid Condenser

Broadcast 550 KC 1st IF 4 Out Man.

6 Antenna 1500 KC 200 Mmi. Condenser

Broadcast 1500 KC B.C. Osc.

5 Out Man.

7 Antenna 1500 KC 200 Mmf. Condenser

Broadcast 1500 KC B.C. R.F.

6 Out Max.


Broadcast 1500 KC B.C. Ant.

7 Our Max.

WM 9 Antenna 600 KC 200 Mml.

Condenser Broadest 600 KC B.C.

Pad. 8 Ont Max.

k rocking. Repeat 6, 7, 8,

d 9 until no change s. noted.

10 Antenna 1500 KC 200 Mmf_ Condenser

Broadcast 1500 KC Disc. I In Max.

11 Antenna 5.4 MC 400 Ohm Ranima

Police Amateur

5.4 MC Police Dec

9 Out Max.

12 Antenna 5.4 MC 400 Ohm Resistor

Police Amateur

5.4 MC Police R.F.

10 Out Max.


Police Amateur

5.4 MC Police Ant.

11 Out Max.


Police Amateur

1.8 MC Police Pad.

Out Check calibre -

Lion ut 1.8 MC. Padder is fixed.

15 Antenna 18 MC 400 Ohm Resistor

Short Went

18 MC S.W. Oso.

13 Out Max.


Short Wave

18 MC S.W. R.F.

14 Out Max.


Short Wave

18 MC S.W. Ant.

15 Out Max.


Short Wave

6.0 MC S.W. Pad.

Out Max. Check calibra - Iton at 6.0 MC. Padder is fixed.




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MODEL 12A Schematic

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12 FAIR. -MORSE

MODEL 12A FAIRBANKS, MORSE & CO. Socket, Trimmers Voltage,Resiatance,Data

The Model 12A is an AC operated superheterodyne with automatic POWER SPEAKER volume control, signa -lite band indication, dial - automatic and automatic

frequency control.rwaItand receives signals on four bands broadcast, police -.i14ú amateur, short wave ultra -short wave. OtE0,060,G0 O

Alignment procedure is given in the following pages in chart form. Make adjustments in the order given. The output meter may be any 6LTGo RI

, G tac

low range AC voltmeter, preferably about 0-15 volts. It should be connected across the plates of the 6L6G tubes with a .1 mfd. condenser in110 0 series with one of the leads. The volume control should be set atal maximum during the alignment, and as the meter hand tends to go off scale,the output fromf the signalgenerator should be decreased. If too

6L6G GCSG 6L6G I I 6C5G

strong a signal is fed tootheereceiver and the volume control is used to keep the hand on scale, the A.V.C. will operate and inaccurate align- ,,' ment will result. ó 6KTG 6KTG (}

When aligning the police and short wave bands, care must be taken to see that the trimmers frequency

©'a I awi

are set on the proper and not on the image. The signal from the oscillator bearing with the incoming signal 6QTG in the mixer tube produces two 456 kilocycle heterodynes, one equal to the oscllator frequency minus the frequency of the incoming signal and the other equal to the incoming signal minus the oscillator. The former is the one to which the RF and antenna trimirfers must be tuned if the receiver is to work correctly over the entire band. The image falls 912 AUTOMATIC kilocycles below the fundamental signal, so at 18 megacycles the signal TUNING CONTROL should be heard at 18 minus .912 or 17.1 megacycles approximately.

After setting the oscillator trimmer, increase the input from the signal

TUNING

VOL. CONTROL &SWITCH

- TONE

CONTROL

r- SWITCH

- RANGE

generator and make sure that the image comes in at the proper point. When one signal can be heard at the frequency ro which the I generator is set and one at about one megacycle below it the alignment is ready

be finished. 4

to Go back to the fundamental frequency and start peaking the RF trimmer, rocking the tuning condenser slightly at the same time: 'W/hen a peak has been reached, compare the strength of the fundamental signal and the image. If the image is the stronger, the RF trimmer is at the wrong peak. Find the other peak and again compare the two signals. It will porbablv be necessary to increase the generator input greatly in order even to hear the image when the right peak has been found.

0 O (J ..¿

d

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d

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O C) - O f

orz

OHMS VOLTS 687G VOLT OHMS OHMS VOLT 6L7G VOLT OHMS OHMS VOLTS 6J7G VOLTS OHMS

MOWr a 42,500 5700 100 250 5,700 100 01

3.T 320 5j00

10,000

100

232.Qç .35

13,500 192

- 4.8

10,511 235 0 IMF, 0 0 IMF, Vr70 0 IMF.

0 6.3 Hi C AD 1Y o o

0 0 6.3 0 0 6. 3 AC tom L 0 0

250 o 0 3.7 320 0 0 5.2 500 0 0 4.8*

OHMS VOLTS 6C5G en OHMS OHMS re 6K7G VOLTS OHMS OHMS VOLTS 6K7G VOLTS OHMS

OSC 1ST IF 2ND IF

.05 1,500 5,700 100 PO 8.3 2,901 5,700 ¢ 3.2 1,500

s1 200 O(O ©V

10,500 232 0¡ ©f 0 IMF. 10,500 232 O

©4[G)l 0 7.50 1 6.3 ©v p 0 0

0 6.3 pp 8.3 0 0 0 0 O 6.3 0

1 0 0 0 0 0 2,900 0 0 3.2 1,500

OHMS VOLTS 6H6G VOLTS OHMS OHMS VOLTS 6C5G VOLTS OHMS OHMS VOLTS 607G VOLTS OHMS

as -.13

PHASE IN VERTER

190M 0 500M 0 0

.a -.13

1

O O O

230M

O Or-) 0 500M 0

- O O C° 230M 13,000 108

©© © 190M 0

110 6.3 r'© 0 500M

0 6.3 AC 0 0 0 6.3

AC 0 0 1y 0 0

0 0 0 0 4.8 E25 0 0 1.15 4,500

OHMS VOLTS VOLTS OHMS OHMS VOLTS 6L6G VOLTS OHMS OHMS VOLTS 584G VOLTS OHMS

10,511 215 0 190M 10,500 215

4'

0. 190M 55 AC

n AC 58 13,011 395 O 13,000 395 O

O O

Q 0 6.3 Ojpy 0 0 0

O

a' © 0 QI Ac 6.3 0 13,500 405 v

0 0 18.7 205 0 0 18.7 225 405 13,100

.3 VOLT SCALE VOLTAGE AND RESISTANCE ANALYSIS CHART "30 VOLT SCALE





THE AUTOMATIC DIAL Since the Model 12AC6 is to be delivered to the customer with the

dial set up for the locality in which he lives, it is important that the serviceman be thoroughly familiar with the proper set-up procedure so that he can perform the operation accurately and in a small amount of time.

It would be practically impossible to design a mechanical tuning device for a receiver as selective as the 12A which would automatically tune stations to the exact point of resonance every time without the operator's having to watch some sort of resonance indicator. For that reason automatic frequency control (true AFC tuning) has been incor- porated into this model. The automatic frequency control makes up for the slight mechanical tolerances necessary in a device such as the automatic dial by shifting the oscillator to the exact frequency of the station to which the dial is tuned. It will be noted that stations can be "pulled" into resonance with the dial as much as 10 kilocycles away from the point where they would come in with the automatic tuning switch in the "out" position, and for that reason accurate setting of the dial might seem unimportant. It must be remembered, however, that the sensitivity of the receiver is best at the point where the stations come in without A.F.C. and that A.F.C. shifts only the oscillator frequency, not the RF and detector stages. Therefore, accurate setting of the dial is impºt'tant if good reception is to be obtained on all the stations.

First, throw the automatic tuning switch to the "OUT" position. Then, by means of the outer tuning knob, tune in a station to which a button is to be assigned. Now, place a finger on the button nearest the "click" point (the mid -point at the bottom) and move it over to the "click" point until the dial locks. Care must be taken at this point that it depressing the button without its pyralin coveting the metal plunger in the center is not pushed to a point where the dial will not lock. If this difficulty is experienced, try depressing the button with the nail of the forefinger against its outer edge.

After the dial has clicked into place and seems to be locking properly,

MODEL 9A,12Á Automatic Dial Notes MODEL 12A Alignment

release the button taking care not to move the dial. Now, with a pencil or screw driver held in the left hand push the metal plunger at the center of the button in as far as it will go. With the right hand retune the station carefully and then release the metal plunger. It may not. come all the way out at first and a slight back and forth motion of the vernier knob may be necessary before it snaps out to its original position. Be sure that he plunger is back into place before the station tab is placed in the button.

To check the setting before putting in the station tab, rotate the dial until the button which was just set is somewhere near the top of the dial. Throw the automatic tuning switch to the "IN" position and use the button to tune in the station just as is described under "Automatic Tuning" in the Operating Instructions. Observe the same precautions as were mentioned before in regard to the metal plunger or the setting will have to be made all over again. With the station still tuned in, throw the automatic tuning switch to the "OUT" position and note the amount of detuning which occurs. If the station is detuned more than 3 or 4 kilocycles or to a point where the side bands are just barely audible, there is a closer setting possible and the button should be reset. When the dial seems to be tuning in the station properly, put in the proper station tab and place one of the pyralin discs over it. The tab should be placed so as to read right side up when the button is at the "click" point. This gives a uniform appearance to the dial when the buttons have all been set. In case any of the buttons are not used, put in one of the blank tabs supplied and a pyralin disc.

Set the remainder of the buttons in exactly the same manner, making sure each time that the switch is in the "OUT" position before an adjustment is started.

When the dial setting has been completed, replace the sheets of station tabs in their envelope and put the envelope, together with the one containing the pyralin discs, into the back of the cabinet beside the chassis so that they will be available later should the customer desire to have the dial set for other stations.


No. Connect

To


r ntenna

Range Switch

Dial Setting Sage Trimmer

No. AFC

Switch Peak For


6L7G Grid 456 KC Mfd. Condenser

Broad Cost 550 KC 1 Out Max. See foot note below.


Broadcast 550 KC Disc. 2 Out Man. +See foot note below.

3 617G Grid 456 KC .1 Mfd. oadeneer

Broadwet 550 KC Disc. 18 Out Mis. esse foot note belay.


Broadcast 550 KC 2nd IF 3 Out Max.

5 6L7GGrid 456 KC .1 Mfd. Condenser

Broadcast 550 KC 2nd IF 4 Out Ma.

6 617G Grid 456 KC .1 Mfd. Condenser

Broadcast 550 KC 1t IP 5 Out Max.


Broadcast 550 KC 1st IF 6 Out Max.


Broadcast 1500 ICC Osc.

Out Ma.


Broadcast 1500 KC B.C. R.P.

e Out Max_


Broadcast 1500 KC B. Ant.

9 Our Max.


Broadcast 600 KC B.0 Pad.

IO Out Max. *While rocking.

Repeat 8, 9, 10, and 11 until no change le noted.


Police Amateur

5.4 MC Palia O.c.

11 Out Max.


Police Amateur

5.4 MC Polio R.F.

12 Out Mas.

14 Antenne 5.4 MC 400 Ohm Resistor

Police Amateur

5.4 MC Polite Ant.

13 Out Max.


Police Amateur

1.8 MC Palia Pad.

Out Check calibrs then et 1.8 MC. .Paddel ie fùed.

16 Antenna 18 MC 400 Ohm Raietor

Short Wave

18 MC S.W. Ou.

Out Motz


Short Wave

18MC S.W. R.F.

16 Out Max.


Short Wave

18 MC S.W. Ant.

17 Oat Max.


Short Wave

6 MC S.W. Pad.

Out CSeck calibration at 6.0 MC Padder is fiad.


Ultra S.W.

60 MC Out "See foot nate below.


Ultra S.W.

30 MC Out **See foot tua below.

...No adjustment is required on this band. If signal is not received on or near dial setting, check the oscillator tube, switch contact., the feed padding coodeseer and the coils. To check the setting of the discriminator, tune in a fairly weak oration near 1000 kilocycles with the automatic tuning switch in the "our, position. Peak the station carefully and tbsnthrow the witch to the "IN" position. If throwing the switch detunea the station, nyeak it carefully using trimmer number I8. A further check may be made by tuning to either side of the station with the switch out until only the side bands are audible and then throwing the sweets in. The atstion should come into resonance es the switch ie thrown in. Failure to do ea indicates that the adjustment just described has not been careful enough and that it should be made over again.



14 FAIR. -MORSE

MODEL 12C6 Chassis 120 Socket,Trimmers Voltage,Resistance

LONG WAVE BROADCAST

POLICE SHORT-WAVE

SW

SHORT WAVE

POLIC BROADCAST OSC. TRIMMERS


OMIS VOLTS 667 TUTE VOLTS 04040

511 105 3 300

6011 246 'J ' T

0 :we

.2 6.3 64 '3 O 0 0

O

0 0 --Y 3 300 r 01M3 VOLTS 611 TUBE VOLTSI OMIS

SOI 106 3.5 300

6.4 245 O U 0 , IE6

.2 6.3 OI O 0 0

0 0 3.5 300

01MS VOLTS 6C5 TUBE VOLT OMMS

.0 50014

J {UM 265 1.).,

.2 6.3 O O

Y 0 0

0 0 - 18 10

OMIS¿, OLTS SMa TUBE VOLTS 0015

45 A.C.

i/ A.G. 45

6011 420 J -0

0 0 420 6011

O s

O0i !e

ri

6

6L

GROUND ANTENNA

I. F. TRIMMER CONDENSERS

SPEAKER CABLE

A. G. CORD LONG WAVE POL ICE BROADCAST

USC. PADDERS

1::::11:31 IL7 TUSE

11111

WI 5011

6014

5011

2«E

S00

01MS V 51.4 TUBE O.TS

300

01115

0

4

aM

FIGURE 4

01045 VOLTS 6J7 TUSE VOLTS OMS

6SM

7061

o

04115

1000

25014

.2

o

0005

240 0

155 0 2.5

0 ` O 6.3

VOLTS 6116 TUSE VOLTS

10

o

111

VOLTS 616 TUBE VOLTS

50.

.2

.5

0040

3000

o

1000

01105

601

.2

0

000$

245

355

6.3 O i 0

0 17.5

OLTS 6E5 TURC VOLTS

750

0

200

04140

21E6

.2

0 O O_ 245

2.5 -U' O 0

6.3 ` c o

611

FIGURE 6 VOLTAGE AND RESISTANCE TABLE

The voltage and resistance charts in this manual give detailed information regarding the resistance from various points to various other points in the chassis. The measured voltage from the various tube socket contacts to ground is also given. When these charts are

followed faithfully, littledifficulty should be experienced in finding almost any fault that may develop.




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16 FAIR. -MORSE

MODEL 12C6 Chassis 120 Alignment


THE OSCILLATOR CIRCUIT The oscillator circuit is unconventional in that the tickler colts

are In the cathode circuit of the 6J7 oscillator tube, this Is done to

obtain sufficient band coverage with the additional capacity of the 6LT

tube Injector grid across the tune circuits and also to accommodate the

receiver to operation up to 70 megacycles. One tickler serves for Both

the Broadcast 'and Police -Amateur bands and the second tickler serves

the 'short wave band, being switched in and out by the range switch.

The tuned circuit coil for the Ultra Short Wave band consists of

three pieces of heavy bus wire. The cathode taps into this circuit and

causes oscillation at the high frequency end of the band. In addition,

on this band,a small coil which is Inductively coupled to the bus wire

coil Is switched into the plate circuit and causes the tube to oscillate

at the low frequency end of the band.

On the other bands, the plate of the oscillator tube is by-passed

to ground through the padding condensers of the oscillator tunedcircults

and assists the oscillator at the low frequency end of each band. The

patent on this circuit was Issued to MacNabb.

INTERMEDIATE FREQUENCY ALIGNMENT With the range switch on the broadcast position,the fidelity switch

on 'Sharp' (clockwise) and the gang condenser closed(maximum capacity),

supply a 456 kilocycle signal stage by stage,to the Intermediate fre-

quency amplifier beginning with the grid of the second intermediate

frequency tube. To accomplish this, a .1 Mfd. condenser should be con-

nected between the signal generator supply lead and the second intermedi-

ate frequency tube.

The trimmers of the third intermediate frequency transformer should

be adjusted for maximum output with minimum input from the signal gener-

ator. Then the signal generator lead should be moved to the first in-

termediate frequency tube and the trimmers of the second intermediate

transformer should be adjusted. The next step is to supply the signal

to the grid of the first detector tube and adjust the trimmers of the

first intermediate frequency transformer. This method of procedure is

essential because of the extreme selectivity of the receiver. After

each stage has been allgned,it Is weil to go back over all adjustments

to make sure they are accurate.

The next step in the Intermediate frequency alignment Is to supply

a very strong (about 1000 microvolt) signal to the grid of the first

detector tube through the .1 Mfd. condenser. CAUTION: Before the sig-

nal Is applied to the receiver, the volume control should be retarded

to zero. After the signal Is applied to the receiver,the volume con-

trol should be advanced slowly and carefully until a suitable indica-

tion appears on the output meter. The fidelity switch should be turnedto the high fidelity or Third

Dimension position. Symetrical double humps should appear, one on each

side of where the sharp resonance point appeared on the Sharp' posi-

tion (see Figure 5) when the signal generator is tuned approximately

8 kilocycles on each side of the resonance point. The two humps must

be of equal amplitude. If this is not the case, the trimmers of the

third Intermediate frequency transformer must be adjusted until a con-

dition of equal amplitude Is obtained. This may be found to be a very

difficult adjustment unless an oscillograph is used.

A B

FIGURE 5

USE OF THE OSCILLOGRAPH A signal generator with a sweep circuit must be employed in making

this check. The output of the signal generator should be fed to the

grid of the first detector tube in the receiver. The grid clip must be

removed from the tube,but,since the first detector is one of the A.S.C.

controlled tubes,it Is necessary to complete the grid circuit. To ac-

complish this, connect a large resistor (about 50,000 or 100,000 ohms)

between the grid clip and the grid cap of the tube. The low side of

the signal generator should be connected to the chassis ground.

The 'vertical' binding posts of the osciliograph should be connec-

ted to the audio output of the second detector. The high side connec-

tion from the 'vertical' plates should be made to the point of juncture

between resistors 58 and 59. The low side connection may be made to

ground. Thus, the audio voltage Is applied to the 'vertical' plates

of the oscillograph.

With the receiver operating an the 'Sharp' position,the intermedi-

ate frequency amplifier resonance curve will appear on the screen.When

the receiver is switched to the 3RD DIMENSION' position, symetrical

double humps, approaching a wide flat top resonance curve, should ap-

pear in place of the Sharp' resonance curve (see Figure 5). Each

side of the curve should be of equal amplitude. If this Is not the

case, the trimmers of the third intermediate frequency transformer

should be adjusted until the proper curve Is obtained. The adjustment

of one trimmer, in addition to effecting its own side of the curve,

will reflect in the other side and,far this reason, great care must be

exercised In making these adjustments.

RADIO FREQUENCY ALIGNMENT

The parallel or high frequency trimmer condensers for each coil

are housed In the tame can with the col l,with the exception of the oscillator trimmers these are air dielectric condensers and are mounted

on the chassis. These trimmers are used for aligning the high frequency end of each band. The location of the various trimmers is shown on

Figure 4. It Is essential that the bands be aligned in the order they

appear in the following instructions. In other words, the police band

alignment must be completed before the broadcast band alignment is

started because of the interlocking effectof the padding condensers on

these bands.

Adjustable series padding condensers are used for tracking the oscillator at the low frequency end of each band. The padding condensers may be adjusted from the top of the chassis,through the holes indicated In Figure 4, Since a fixed mica padding condenser Is employed on the Short wave band,no adjustment is necessary. While making padding condenser adjustments, the gang condenser should be rotated back and forth across the signal to Insure adjustment to the peak of greatest Intensity.

POLICE BAND With the band selector switch on the police position and the fidel-

ity switch on the "Sharp' posltion,supply a 5 megacycle signal from the

signal generator to the antenna of the receiver,using a 400 ohm carbon

resistor in series with the signal generator lead. Tune the receiverto

5 megacycles and then adjust the oscillator,radio frequencyand antenna

stage police band trimmers for maximum output with minimum input from

the signal generator. WARNING: Care must be exercised to avoid align-

ing the receiver to the image frequency as outlined under Short wave

Band'.

Supply a 1.8 megacycle signal to the receiver and tune the receiv-

er to 1.8 megacycles. Adjust the police band oscillator padding conden-

ser (see Figure 4.), for the signal of greatest intensity, rocking the

gang condenser back and forth across the signal while making adjustment.

Check at 5 megacycles and then at 1.8 megacycles to correct for any

frequency change.

BROADCAST BAND

With the band selector switch on the broadcast position, supply a

1500 kilocycle signal from the signal generator to the receiver, using

a standard dummy antenna or a200 Mmfd. condenser in series between the

signal generator and the antenna post of the receiver to serve as the

dummy antenna. Wake certain that the fidelity switch is on the Sharp"

Position.

Tune the receiver to 1500 kilocycles and adjust the radio fre-

quency, antenna and oscillator stage broadcast band trimmers for maxi-

mum output with minimum input from the signal generator.

Supply a 600 kilocycle signal to the receiver through the same connections. Tune the receiver to 600 kilocycles. Adjust the broadcast band oscillator padding condenser (see Figure 4), for the peak of greatest intensity while rocking the tuning condenser back and forth across the signal. Recheck at 1500 kilocycles and then at 600 kilo-

cycles and make any frequency corrections that appear necessary.

LONG WAVE BAND With the band selector switch on the long wave position, supply

a 350 kilocycle signal from the signal generator to the antenna of the receiver using a standard dummy antenna or a 200 Mnfd, condenser in

series with the lead. Make sure the fidelity switch is on the Sharp'

position. Tune the receiver to 350 kilocycles and adjust the oscilla-

tor, radio frequency and antenna stage trimmer condensers for maximum output with minimum Input from the signal generator.

NOTE - The Long Wave oscillator trimmer is accessable through a hole In the chassis bottom shield plate.

Supply a 175 kilocycle signal to the receiver through the same

connectioni used in the previous adjustment. Tune the receiver to 175

kilocycles, Adjust the long wave oscillator padding condenser for the

peak of greatest intensity while rocking the tuning condenser back and

forth across the signal. Readjust at 350 kilocycles and tnen at 175

kilocycles as many times es may be necessary to obtain satisfactory

tracking.

SHORT WAVE BAND

Turn the band selector switch to the short wave position. Supply

an 18 megacycle signal from the signal generator through a 400 ohm

carbon resistor (dummy antenna) to the antenna post of the receiver.

Tune the receiver to 18 megacycles on the dial. Adjust the short wave

band oscillator trimmer condenser for maximum output with minimum Input

from the signal generator, then adjust the short wave band antenna and

Radio Frequency stage trimer condensers for maximum output at the

same time rocking thetuning condenser back and forth across the signal

to insure the peak of. greatest Intensity. The 6 megacycle signal should

be received near 6 megacycles on the dial. if the signal is not re-

ceived check the oscillator tube switch connections, the fixed padding condenser and the coils. No adjustment is required at this point.

Check the calibration and, if necessary, readjust all three stages.

WARNING: The Image signal should be received at approximately 17 mega-

cycles after the above adjustments have been made. If It cannot be

located, the oscillator has probably been aligned to the image frequency

and the oscillator trimmer must be backed out until the proper signal

comes in at 18 megacycles and the somewhat weaker Image Is received at

approximately 17 megacycles. If this readjustment is necessary, it

will also be necessary to again align all three trimmers for maximum

output.

ULTRA SHORT WAVE BAND

No adjustment is required on this band. If signals are not pro-

perly received check the oscillator tube, switch contacts, fixed con-

denser and the coils.

POWER TRANSFORMERS Lead Color voltage

Black 115 volts Primary

Green 6 3 volt Filament

Yellow 5 0 volt Filament

Red High voltage Sec.

Red & White High voltage C.T.

COLOR CODES L F. TRANSFORMERS

FIRST SECOND Plate Blue

Gridlus (Top). f . . Green

Grid Return `A.y.C.) Black -White Switch Lead Brown -White Switch Lead (Sharp) Brown Switch Lead (3rd,Dim) Black

Plate Blue lus Red

Grid (Top). f

Green Grid Return `Ground) Black -White Switch Lead Brown -White Switch Lead (Sharp) Brown Switch Lead (3rd Dim) Black

THIRD Plate Blue 'B' Plus Red Grid Green Grid Return Black -White




of at least 135 ampere hours

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F AIRRANïiS, MORSE CO. MODELS 42CIB,42T0B Chassis 42 Sc1ìe atic,Notes

The model 42 chassis employs a type 106 pentagrid converter. The incoming signal is supplied to this tube through a preselector coil arrangement. This tube serves the dual function of first detector and oscillator. A type 1B4 is employed as the intermediate frequency amplifier. This tube and the two intermediate frequency transformers are responsible for most of the selectivity and gain in the receiver. A type 1 B4 tube performs the dual function of detector and fi rst audio amplifier. The output of the second type 1B4 tube is resistance coupled to a type 33 tube in the power output stage. A storage battery having a capacity

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18 FAIR. -MORSE

MCD .JS 42CIB,42T0B Chassis 42 Socket, Trin mers, Notes Alignment,Batt.Conn.

BATTERIES This receiver has been designed to operate equally well on an Air

Cell A' Battery or a Two Volt Storage Battery as the A' supply,

A three volt dry battery may be used with the receiver but the

life of such a battery Is usually not as long as that of the other types.

AIR CELL "A" BATTERY

If the receiver Is to be operated on an air cell battery only one

section of the resistance link" clrc It should be connected (See X'

Figure 3). The remaining two leads from le positive (+) A' lead should

be taped or otherwise insulated so they will not come in contact with

any of the other battery terminals.

TWO VOLT STORAGE "A" BATTERY

If the receiver Is to be operated on a Two Volt Storage 'A' Battery,

"A'none

of the connectionssareatoe be made asuit shown s

to under."I"used. of Figure

Positive The u

t

used leads should be taped so they will not come In contact with toe

ether battery terminals.

THREE VOLT "A"BATTERY

If the receiver Is to be operated on a Three Volt 'A' Battery the

'resistance link' circuit should be connected as shown under 'Z' of Fig-

ure 3. The unused leads should be taped so they will not come in con-

tact with any of the battery terminals.

When the Three Volt 'A' Battery becomes so low or weak that the re-

ceiver will no longer operate satisfactorily, the connections may then

be changed to conform with X' under Figure 3, thus obtaining a little

more operating time fro* the battery.

When the Three Volt 'A' Battery again becomes s0 low that the re-

ceiver will not operate satisfactorily, the connections may once more

be changed, to conform with 'Y' of Figure 3, thus again obtaining more

operating time from the battery.

NOTE - These changes must not be made until the battery becomes so low

that the receiver does not operate properly, and then the change must

be made one step et a time as described above otherwise the tubes In

the receiver may be damaged.

"B" BATTERIES Three 45 volt 'B' batteries, with standard plug receptacles, are

required with the receiver. Good quality, HEAVY DUTY batteries ere roc -

commended.

"C" BATTERIES 16{ volts of "C" battery are required on the receiver. This volt-

age may be obtained from a standard 22* volt battery, with a standarc

plug receptacle, with a 16* volt top.

BATTERY CABLE CONNECTIONS "A" BATTERY

The Black battery lead is to be connected to 'A' minus (-). The

Red battery lead is to be connected to A' plus (+), See Figure 3.

"B" AND "C" BATTERIES

Four Standard Battery Plugs will be found on the battery cable,

three of these are identical to each other and are to be plugged into

the Standard Receptacles on the three 'B' batteries. The remaining plug,

the one with the different terminal arrangement, should be plugged Into

the 'C" battery.

1VARN I N - DO NOT ALLOW THE 'A" BATTERY LEADS TO COME IN CONTACT WITH ANT

áF TO B BATTERY TERMINALS. IF THIS HAPPENS, THE TUBES, RECEIVER AND

BATTERIES MAY BE SERIOUSLY DAMAGED.

SUGGESTED SERVICE PROCEDURE If the receiver does not operate properly, first test ell batteries

and then test all tubes in a reliable tube tester or, better still, re-

place the tubes In the receiver, one by one, with tubes known to be good.

Rost difficulties will be found In or centered around defective tubes,

or batteries. If, after replacing any defective tubes or batteries,

the receiver Is still Inoperative, reao,e the chassis from the cabinet

and conduct a careful resistance analysis using the resistance values

shown on the schematic diagram as a guide. This will usually reveal

the source of the difficulty.

ALIGNMENT PROCEDURE To insure obtaining the performance the model 42 chassis Is capable

of delivering, It is essential that It be aligned perfectly. For this

reason, It's urged that the following instructions be studied carefully before any alignment adjustments are attempted.

Proper adjusteent of the various tuned circuits will be possible only throuth the use of an accurate and reliable signal generator em-

ployed in conjunction with an output meter, which may be connected from plate to ground on the output tube. A fixed condenser (.1 Rfd.) should

be connected in series with the output meter.

NOTE -All adjustments should be made with the volume control 'full on',

Any desired variation In signal strength should be obtained by adjusting the output of the signal generator.

INTERMEDIATE FREQUENCY 1.- Turn the gang condenser to noxious capacity (fully meshed).

2.- Set the dial pointer at 530 kilocycles and then tighten the sat

screw.

3.- Supply e 456 kilocycle signal .from the signal generator to the

grid of the type 106 first detector tube through a .1 Mfd. con-

denser connected In series with the signal generator lead.

4.- Adjust the radio frequency trimmer ("B'.Figure 1) for maximum out-

put with minimum Input from the signal generator.


4,- Adjust the four trisrors of the two intermediate frequency transformers (see Figure 1) for panino. output with minimum Input from the service oscillator,

RADIO FREQUENCY ALIGNMENT The parallel or high frequency trimmer condensers for each stage

laceted on the gang condenser (see Figure 1)

1.- Tune the receiver to 1500 kilocycles.

2.- Supply a1500 kilocycle signal from the signal generator to the an-

tenna lead of the receiver through a standard dummy antenna or a

200 Nafd. (.0002 Mfd,) condenser, connected In series with the signal generator lead.

3.- Adjust the oscillator stage trimmer condenser ('A" Figer. 1) for maxima output with minimu. leput from the signal generator.

FIRST L F. TRANSFORMER

Plate "B" Plus Grid Return Grid (Top)

Blue Red Black Green

COLOR CODES SECOND

L F. TRANSFORMER

STANDARD RMA

Plate "B' Plus Diode Return Diodes

RESISTOR AND CONDENSER COLOR CODE 0 Black 1 Brown 2 Red 3 Orange 4 Yellow

5 Green 6 Blue 7 Purple B Grey 9 White

POWER TRANSFORMERS Lead Cofer Voltage

Black Breen Yellow Red Red and White

SECOND I. F.

TRIMMERS

FIGURE 1

TOP VIEW

DIAGRAM X

BROWN D 7APE

TWO VOLT STORAGE "A" BATTERY

TAPE,

DIAGRAM Y

115V, Primary 6.30. Filament 5.0Y. Filament Nigh Voltage Sec. Nigh voltage C.T.

OSC. TRIMMER"A"

R. F. TRIMMER'S"

Blue Red Black Green

SPEAKER CABLE

ATT ERY CABL E

FIRST I. F.

TRIMMERS

E TAPE BATTERY UNUSED ENDS

THREE VOLT DRY "A" BATTERY

DIAGRAM Z

FIGURE 3 BATTERY CABLE CONNECTIONS



l'AIR.-3IORSE PAGE 8-19

t9

MODELS 43CIB,43TIB FAIRBANKS, MORSE & CO. Chassis 43

Schenatic,Notes The model 43 chassis employs a type 106 pentagrid converter. The

incoming signal is supplied to this tube through a preselector coil arrangement. This tube serves the dual function of first detector and oscillator. A type 1B4 tube is employed as the intermediate frequency amplifier. This tube and the two intermediate frequency transformers are responsible for most of the selectivity and gain in the receiver. A type 1B4 tube performs the dual function of detector and first audio amplifier. The output of the second type 1B4 tubeis resistance coupled to a type 1F4 tube in the power output stage.

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20 FAIR. -MORSE

MODELS 43CIB, 43i.LL Chassis 43

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,...- C O 0-4_V C 1 0 7 O O L O m 0 V o W V 1. 0 >>4_ u W H N r Y q4. O O !- >m y 4- 4. O m C-- O O C L f+ O L O O a an Z< 4_

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Alignment,`loltage Socket, Trir.::er s

Resistance

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MODII., 57T0 Chassis 57 Schenatic,Voltage Resistance

4- 4- 4- 4- 4- 4- 4- 4- ,- 4- E E E E E EEEEE O O O O O N O O o 0 0

1 I ) ) 1

) r r ) )

.- N M `tt N (\.1 N Chi

\O tD N O LO O O N C

I t 1 1 1

I I I I I

LC) tG N N M M M

a /7 V "0 .a 4- 4- 4- 4- 4- 1:) .D .0 E EEEE 4- 4- 4- 4- 4-

E E E EE O e- M O ln O O 0 0 0 o e-

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r ) r ) r

r ) r 1 r

co m Cr) "it ui N N Cr) Cr) M

V1 E N V) V) E z E E E

. 0 O t L L O CI) Q O O

E Z 0 0 0 0 0 O o C.") e- tn LO tn

) i ) II -tr to m ó r- e-- e- - CV

VI VI V) N tN E EEEE L .0 L L O O O O O

ó ONUS VOL T3 6A8G TUBE VOLTS OMS. ONTS VOLTS 6F 50 TOOL VOLTS OHMS OHMS VOLTS 5Y3 TUBE VOLTS OUTS

INF. 106 --- ,5 2311 INF. 218 -51UFE; 1900 -95

INF. 218 - OD OO

100 ,,,o.INF. 208 -- O9 AL O -95 1900 O

- O 0 O

6.3 0 0

,

6.3 .5 INF. 222 `O O " --- ` 0 ©

0 0 - 6,2 300 0 0 0 0 0 0 222 INF, 1

OHMS VOIT

FIGURE 5 500.1 .15

VOLTAGE AND 50011 T6

RESISTANCE TABLE 0

0

0

607G TUBE OLTS OHMS ONNS VOLTS 6576 TUBE VOLTS ONUS

-.17 6.3

5n Ill

.5

1'íE6

10 FO

106

213

0

G

2.5

6,3

2.5

300

300



22 FAIR. -MORSE

MODEL 57T0 Alignment,Trimmers Socket,Notes


COLOR CODES

FIRST SECOND I. F. TRANSFORMER I. F. TRANSFORMER Plate. . . Blue "B" Plus . . Red Grid Return. . . . Black Grid (Top) . . Green

L 1 not 4-4. M

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Chassis 57

RESISTOR AND CONDENSER COLOR CODE 0 Black 2 Red 4 Yellow 6 Blue 8 Grey

1 Brown 3 Orange 5 Greer. T Purple G White

RESISTORS Plate Blue "B" Plus Red The BODY COLOR represents the FIRST FIGURE of the resistance value Diode Return. Black The END COLOR represents the SECOND FIGURE of the resistance velue Diodes Green The DOT COLOR represents the NUMBER OF CIPHERS following the First

two figures

0 1 1 a< 1 wC0- V120V le 1

O M C 0 U G O r G- 0 0 0 4- U w U- -aii ÑO 'C COC me- rC utrl q

L ó0ió C r ....L.-0 N 0000 N --OG ..-4.. a To 0 < w 010 o L 0 0 4- C

100 La-GLO c CO -0 > U00 C q O 01-4-0.0 O O L o Ñ 0,0 <00 00;F- - uLOr o

V L 1- 0 r w0 ßO Ñ- - C'C a el- g r 0 E

00 0 -- C 0 > Ñ L a- 000 > - M L o.r - ; 3pwLr0r- w cÓ;i - C.OLOUC 0 4-E

m U Ir. ó ú L m L L r m w o> LOO r L r C ry w - L q0 0- uno

in 0 0C

4- N - o00 Or U r 0 i -01-000e0 0 0 0 0 w C C eau C u> --,e a C e.. ---TO O 0 .E g- 0 C

M CV 0-O Lw 00 00Ña0 < 4- 0-.--m 0 SOLL u O Le -rqe oqrmwL; Z T O C -000E i- g L o a O f1CO -[1LE .- C LLL a Z Zee TM q O Ñ 0 O - f-1 OL Cr E a>O> r CO .MO W O - MOO C> ÿ CLmGM OC C>0 'C L C g O -4- r E.y 0 L L LO 0G Og 0- L. -M

E O 0- L L L r ,-1-004+,04... w C O O q r G Eúe LMO 04 O L-r o 0- 0 0.0C 0 0 Q O G 0 O G - O w L 0 OTO Cr -Cor u;- CAM- ,ma Cum o- w 00 c

-O OOw'CL ÿ0 qm .r OO ,y _4- CLO- 0 ...coo-.., W 0 O r a O C O L 0 O r P O T O

w0 Mw 0. -ZU U OT- 000, Owe wGr C 4'LrMMÑ;-L C i- >- 0 N O- COMP 0 0 C q q4- me -CM ;r O -L ÓUL q C O -r r C em rOMCLGN- O-a>-CaM.- C $ V-c g0 - 00 ì -OG q q 00=40 0 aG I Y

-CO T4- ,00.....E. q L so 0-0 00C r0.-00MO-- O -c -a gc 0 -GOC-n-- w M 0 0 ñ O L c c O> N C- V; rwu w>0L 0

Nmi-e00-00 .. r N 0-q OO -1r4q rOCw OC o 4 4-0 O C O rUrO o1-oC0 O- ÓPO

C CGO -C a úOa L G r 0 01-00 4- V O -r E M eV, w ErOL N cam 050 - O C- C 4 M w - >O M O O C. L 0 -0.000 =--; M L.-

RP CPO -O O- LO0Ci1 <c. rcorÑOLu r 00P4- MU - me -CU GrC OB --u0 -q 0c Zw. r0- -wOCMrGar r 0 0 LV c V C T.0 C c._ 4-rNCw mm -.e0.00. 0 r a- g o- a -w 0- L N r N

m Ñ 0 1L

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C - LL"c cCC Tc L0aOOC- MM Ç0 OE wOm CLOai1Ñ u mc 000 0 4 0

M r -r CO L. -p0 CV O- O O Y O C ~ 0 w L U e g O L .O Ó0r PC1,EP

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YOG OLL. yy 0og4-O-P r O o [_ OC - MwOCO W.0.- - O W g> LL L- C C M L 10 q; 00 ,

C F-ou O- 0-OÑ Y ONO

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01-0 L 04- 01, 1 1 1 .000 ¡ 0 'C O C O 'C Y E r r L > - a- 0 C 0 000 M 0 O - w C Ci1 0 O Om

OC L4- 0 .--0C o, -..o 0 0 2. r

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OC COmi. q -w VO C L M O O 0 q C O O g 0 0 O w w w O r r0 0r .00 ajúN Wm t OfG

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Cr C

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u 0 =Le: L 4-4- T L- L OO LE O - u O g L L 0 0 C 0- me U VT u u -4- 0 ->0 w C - c= O q C L r 0 g w U C- Y 00 :li P CL

0E 0 we CC ; ro 000

0 L 0 0 u q ei- m: O Ó r .0 00 a 0 0 0 0 L .O 0 0

U .- O 0- c L LT U O U Vim ; o u c ,00 T c 1- o 00,

0 0 r0.0 PCº u U r -LU O G N- Le U g- C T 00 A O u 0 -r 0 00 L O 01100, -L - L T O C - O L Ea C 0 0 -0 f1 Ñ u G c at.-. 0 0 E 4 -E 00«-Y0 J1 M1 r 0

O 4 - +1w 0000C 4 1 - 0 U O .-.10 O O L w C q OM 00 L 4 U O 0 OC4- OG CO C 0 Et. s 000E O 00 .- C u.4- 0 r. 0OC 00 L an= LwN . 1W 0 L DOO -.- G E r 1 w 0 0 r 4- r ,1 L L 0.0 c qq 0 4-x ¿ 00 wGNN 0C ^V

000. 0E O O V E'C q u 4-

ee se: CO 0 a C q a4N0 - C aL - OCO 00 _ ? C> OC - MO O ÑC OLLOL 0O v.0q. <a F r <0,00 U- a r; 4- 4,, .1.. E

1 1 1 I 1 I O 1 I. 1

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- ,nnnn.

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1111 11 {

1111 1111 1111

tDll d r t TII

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MODEL S 58T1,58T2 Chassis 58

Schematic Vol tage Resi stance

y N N N E E E E E t t t r .CoO 00 O O

X O E 0 o eoo

(12 te - e- .to ón

N N N N y ry t t t 1 1 E E L E E W it 1 1 1 r.Crtr 00000 tti ti CO m v1

E z z z m o 0 0

F1 000 0 '^ tn ill "it N tn V! y N N N N

á =r= ; ; ; ; ; 00000 or- Nr) XXXI tntntntntn o to o In C9 r) e- Ill Al

11111 1 1 1 1 1

O.-NC7e nI` e .t ̀ d' e

V-0 vvv'o1, . -0ß"C1ß É É-0 4-4-4-4-4- 4- 4- 4- 4- 4- 4- 4- 4- E E E E E EEEEE óóEEE

t.12 'et co 00 N ONto00

CO-.-O.-N 00 O OONOO Q;

co co

^ 1 1 I 1 t 1 111111111 w l t l l l 1 1 1 1 1 1 1 t 1 1

Cn e- N r) 'et t11 4.13II .-C0 01 0.- N Cr) it to j e- e- e- e- N N N N N N

. W ii,121 + ,:, -c, ,:,ßMI V V '0 -0 Fj Z 4- 4- 4- 4- 4- 4- 4- 4- 4- 4-

EÉ@EEÉÉEE O ÉO Ó O e- V OOIANto 0000 NO 0 004.00

N %0 e- C0 e- CO

111111

i i i i i ii i i i

C7 `eh to 1.0 r e- CO 01 O e -

OHMS VOLTS 608G TUBE VOLTS OHMS OHMS VOLTS 6F6G TUBE VOLTS OHMS OHMS VOLTS 5Y3 TUBE VOLTS OHMS

INF. 100 -11 4011 INF. 248 -,3 I MEG 1800 -100 --, INF. 242 155 INF.

INF, 235 , O 0 O

0 100 1800

0 0 OW ` ©© 'pes

A4 0

6.3 1 MEG.

,5 o 0

O A.G 6,3 ,5 IIJF, 248 o ` ©©

` 0

0 0 3.6 300 0 0 0 0 0 0 248 INF. -

FIGURE 5 OHMS OLTS 6070 TUBE OLTS OHMS 'OHMS VOLTS 6K 7G TUBE VOLTS OHMS

500

VOLTAGE AND F.

RESISTANCE TABLE.

90 o- -.1 6,3

50011

.5

INF,

INF,

0

100

245 0

2.2

6.3

2.2

300

MEG

.5

300



24 FAIR. -MORSE

MODELS 58T1, 58T2

Chassis 58 Alignment , Trin.er s Socket, Notes


INTERMEDIATE FREQUENCY ALIGNMENT 1.- Turn the gang conderser to maximum capacity (full meshed).

With the Range Switch on the Broadcast position.

2.- Supply a 456 kilocycle signal from the signal generator to the grid

of the first detector tube (6A8G) through a .1 Mfd. condenser connected in series with the signal generator lead.

3.- Adjust the four trimmers of the two intermediate frequency transformers (see Figure 1) for maximum output with minimum input from the service oscillator.

RADIO FREQUENCY ALIGNMENT The parallel or high frequency trimmer condensers for each coil are

housed in the same shield can with the coil. These trimmers are used for aligning the high frequency end of each band, The location of the

various trimmers is shown in Figure 1,

The oscillator, adjustable, series padding condensers are used for

tracking the oscillator at the low frequency end of each band. The pad-

ding condenser may be adjusted from the top of the chassis through the

holes Indicated in Figure 1. Since a fixed mica padding condenser is

employed on the short wave band, no adjustment Is necessary. While mak-

ing padding condenser adjustments, the gang condenser should be rotated

back and forth across the signal to Insure adjustment to the peak of

greatest Intensity.

DIAL ADJUSTMENT Before making any radio frequency alignment adjustments, close the

variable tuning condenser (maximum capacity), loosen the screw that se-

cures the dial pointer place the pointer In a horizontal position (gang

condenser still closed and then tighten the screw.

NOTE - The three bands must be aligned in the following order: First,

police; second, broadcast; third, short wave.

POLICE BAND 1.- Turn the band selector switch to the police band (center) position.

2.- Tune the receiver to 6 megacycles.

3.- Supply e 6 megacycle signal from the signal generator to the an-

tenna lead of the receiver through a 400 ohm carbon resistor (dummy

antenna), connected in series with the signal generator lead.

4.- Adjust the police band oscillator trimmer condenser (Figure 1)for

maximum output with minimum input from the signal generator, then

adjust the police band antenna stage trimmer for maximum output, et the same time rocking the tuning condenser back and forth across

the signal to Insure the peek of greatest Intensity.

5.- Tune the receiver to 2.4 megacycles.

6.- Supply a 2.4 megacycle signal to the receiver through the same

connections used on the previous adjustment.

7.- Adjust the police band oscillator padding condenser (topof chassis

see Figure 1) for maximum output with minimum Inputfrom the signal

generator, at the same time rocking the tuning condenser back and

forth across the signal to insure the peak of greatest intensity.

8.- Check at 6 megacycles and then et 2.4 megacycles and make any ad-

justments that are necessary to obtain satisfactory calibration.

BROADCAST BAND 1.- Turn the band selector switch to the broadcast (counter -clockwise)

position.


3.- Supply e 1500 kilocycle signal from the signal generator to the

antenna lead of the receiver through a standard dummy antenna or

a 200 Mefd. (.0002 Mfd.) condenser, connected In serles with the

signal generator lead.

4.- Adjust the broadcast band oscillator trimmer condenser (Figure 1)

for maximum output with minimum input from the signal generator.

Then adjust the broadcast band antenna stage trimmer for maximum

output.


6.- Supply a 600 kilocycle signal to the antenna of the receiver

through the same connections as previously used.

7.- Adjust the broadcast band oscillator padding condenser (top of

chassis, see Figure 1) for maximum output with minimum Input from

the signal generator,at the same time rocking the tuning condens-

er back and forth across the signal to Insure the peak of great-

est intensity.

8.- Check at 1500 kilocycles and then at 600 kilocycles. Make any ad-


9.- Supply a 456 kilocycle signal to the antenna of the receiver

through the dummy antenna with the gang condenser at 600 kilo-

cycles.

10.- Adjust the wave trap trimmer 'A' (see Figure 1) for minimum out-

put.

SHORT WAVE BAND

1.- Turn the band selector switch to the short wave (clockwise) posi-

tion.


3.- Supply a 20 megacycle signal from the signal generator to the an-

tenna lead of the receiver through a 400 ohm carbon resistor (dummy

antenna), connected In series with the signal generator lead.

4,- Adjust the short wave band oscillator trimmer condenser (Figure 1)

for maximum output with minimum Input from the signal generator.

Then adjust the short wave band antenna stage trimmer for maximum

output, at the same time rocking the tuning condenser back and

forth across the signal to Insure the pzak of greatest Intensity.

5.- The Bmegacycle signal should be received near 8 megacycles on the

dial. If this is not the case, check the oscillator tube, switch

connections, the fixed padding condenser and the coils. Ho adjust-

ment Is necessary at this point.

WARNING - The image signal should be received at approximately 19 mega-

cycles on the dial. If not, the oscillator has been aligned to the image

frequency and the oscillator trimmer condenser must be backed out until

the correct signal is received at 20 megacycles and thelmage at approxi-

mately 19 megacycles. if readjustment is found necessary, the antenna

stage trimmer should also be checked again.

ANTENNA AND GROUND CONNECTIONS The BLUE wire on the receiver Is to be connected to the antenna.

The BLACK wire on the receiver Is to be connected to the ground. When

e FAIRBANKS -WORSE ANTENNA is used, the BLUE wire from the receiver Is

to be connected to the red wire on the antenna set coupler and the BLACK

wire from the receiver Is to be connected to the black wire on the an-

tenna set coupler and to a good ground.

The most suitable antenna for use in large cities or congested

radio districts,where Interference is a serious problem, is the doublet.

In small centers of population, where interference is not serious, a

single wire antenna having a total length offro 75 to 100 feet, erect-

ed as high as possible, with a good Insulator at Bach end, will prove

satisfactory. The lead-in should go to the receiver by the most direct

route and should be kept away, as far as possible, from obstructions.

Such an antenna will have less directional properties and less tendency

to pick up power line interference than a low antenna with a long hori-

zontal lead.

BROADCAST POLICE

SHORT-WAVE TRIMMERS

WAVE TRAP TRIMMER'A. BROADCAST OSC. PADDERs POLICE

eo7O - ered

Sß_3 e 2NDI.F TRIMMERS

COLOR CODES

FIRST I. F. TRANSFORMER

A A G. CORD 1 ST I F

TRIMMERS

ANTENNA -BLUE

GROUND -BLACK

SECOND I. F. TRANSFORMER

Plate Blue Plate Blue 'B' Plus Red "B' Plus Red

Grid Return Black Diode Return. . . .Black Grid (Top) Green Diodes Green


1 Brown 3 Orange 5 Green 7 Purple 9 White

POWER TRANSFORMER

Lead Color

Black Green Yellow Red

Voltage

115 Volt Primary 6.3 Volt Filament 5.0 volt Filament High Voltage Sec. High Voltage C.T.

Red & White

RESISTORS The BODY COLOR represents the FIRST FIGURE of the resistance value

The END COLOR represents the SECOND FIGURE of the resistance value

The DOT COLOR represents the NUMBER OF CIPHERS following the First

two figures

MICA CONDENSERS (Capacity In Micro-Microfarads)

The FIRST DOT on the condenser represents the FIRST FIGURE of the capa-

city The SECOND DOT on the condenser represents the SECOND FIGURE of the capa-

city The THIRD DOT on the condenser represents the NUMBER OF CIPHERS follow-

ing the first two figures. The colors on the condensers should be read from left to right with the

condenser In an upright position.

©John Fe Rider, Publisher



W

N Q

h'AIRBANKS, NTORSh. & CO. LDDEL 68T6 Chassis 68 Schematic

COLOR CODES FIRST SECOND

I. F. TRANSFORMER I. F. TRANSFORMER Plate Blue Plate Blue B Plus Red "B" Plus Red Grid Return Black Diode Return Black Grid (Top) Green Diodes Green

It.

\ 4Q 1 135- 1"OD 9N1,17f)Q -HOD 3D10/e

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1 1 1 1 1 1 1 1 1 1 1

"Kt LL)tD1"-00tTOr-



PAGE rt-'L(i FAIR.-AIORSr.

MODEL 68T6 Chassis 68

Socket,Trinners Alignment r O t AL m } r Ul

L mt 3 . .1-..1-. Y O C -

u0 u 0

3 av 0

m I N- m 4- 4-. A u m C- O 4 m V L C E a J 4 m O N t C v Jrm n vmr r q V N

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FAIRBANKS. JTORSI+, & CO.

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Upper Voltage Readings A. C.

FAIRBANhS, MORSE & CO.

04145 V0115 606 V01.1500145 01.05NOU5 43 001301145 OHMS 0013S 2525 vOLTs 04445

290019G

2700

la/

08

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17.5

17.5

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2700106

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65

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96

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MODEL 68T6 Chassis 68

Model 69T7 Chassis 69

Vol tage, Resistance

Lower Voltage Readings

D. C.

FIGURE 5 VOLTAGE AND RESISTANCE TABLE MODEL 68

011145 VOLTS 606 VOLTS OHMS 01045 VOLTS 43 VOLTS OHMS OHMS VOLTS 25Z5 40175 0.115

2500

2500

450

9]

95 9s

7.0

0 0

5.9

5

9.8

25`450

5000

500

300

1500

3000

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%:

87

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0 p

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1.S

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2500

590

450

95

95

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95

5 15''' 5

2500

590

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G

a 0 © r, C

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OHMS VOLTS 6A7 WLT50005 OHMS VOLTS 76 601:13014M5 OHMS V005 165L4 VOL15 OHMS

2500

9900

2500

450

95

9]

294c LG

ó

_L75

I.75 2D5© 30"- 19.5

6,g

50M

ISO230M

450 450

7e0 5.1-3 0. -15

0 0

4

jpC -9 450 590 .J5

»'c 53

SOc

490

450 CI%.c

l;, L

( ©

FIGURE 5 VOLTAGE AND RESISTANCE TABLE

MODEL 69

NOTE - The upper voltage readings shown indicate the voltage from each respective prong to ground with the receiver connected to an A.C. (Alter- nating Current) power line.

The lower voltage readings were taken with the receiver connected to a

D.C. (Direct Current) power line.

These Voltage readings may vary with the fluctuation in line voltage.



28 FAIR. -MORSE

Li0DEL 69T7 Chassis 69 Schematic, Socket Trinners,Alignment

`6000660'

LD N

N Lo

FAIRl3ANhS, MORSE & CO.

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MODELS 72C2,72C3,72T3 Chassis 72 Schematic, Voltage Resistance

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30 FAIR.-AMORSE

MODELS 7202,72C3,72T3 Chassis 72 FAIRBANKS, MORSE & CO.

INTERMEDIATE FREQUENCY ALIGNMENT SHORT WAVE BAND

Ali glue nt, Socket Tri>rallers,Data

1.- Turn the gang condenser to maximum capacity (fully meshed). With

the range switch on the broadcast position. 1.- Turn the band selector switch to the short wave (clockwise) posi-

tion.

2.- Supply a 456 kilocycle signal from the signal generator to the

grid of the first detector tube (688G) through a .1 Mfd.condenser

connected In series with the signal generator lead.

3.- Adlust the four trimmers of the two intermediate frequency transformers (see Figure 1) for maximum output with minimum Input from

the service oscillator.

RADIO FREQUENCY ALIGNMENT The parallel or high frequency trimmer condensers for each coil

are housed in the same shield can with the coil except the oscillator

trimmers, these are air dielectric condensers and are mounted on the

chassis. These trimmers are used for aligning the high frequency end

of each band. The location of the various trimmers is shown In Figure 1.

The oscillator, adjustable series padding condensers are used for

tracking the oscillator at the low frequency end of each band. The padding condensers may be adjusted from the top of the chassis through the

holes indicated In Figure 1. Since a fixed mica padding condenser is

employed on the short wave band, no adjustment is necessary. While mak-

ing padding condenser adjustments, the gang condenser should be rotated

back and forth across the signal to Insure adjustment to the peak of

greatest intensity.


variable tuning condenser (maximum capacity), loosen the screw that se-

cures the dial pointer, place the pointer in a horizontal position (gang

condenser still closed) and then tighten the screw.

POLICE BAND

1.- Turn the band selector switch to the police band (center)posltlon.


3.- Supply a 6 megacycle signal from the signal generator to the antenna lead of the receiver through a 400 ohm carbon resistor (dummy antenna), connected in series with the signal generator lead.

4.- Adjust the police band oscillator trimmer condenser (Figure 1)fer

maximum output with minimum Input from the signal generator, then

adjust the police band radio frequency and antenna stage trimmers

for maximum output.


6.- Supply a 2.5 megacycle signal to the receiver through the same

connections used on the previous adjustment.

7.- Adjust the police band oscillator padding condenser (top of chas-

sis, see Figure 1) for maximum output with minimum Input from the

signal generator, at the same time rocking the tuning condenser

back and forth across the signal to Insure the peak of greatest

Intensity.

8.- Check at 6 megacycles and then at 2.5 megacycles and make any ad-


BROADCAST BAND

1.- Turn the band selector switch to the broadcast (counter -clockwise)

position.


3.- Supply a 1500 kilocycle signal from the signal generator to the

antenna lead of the receiver through a standard dummy antenna or

a 200 1Yfd. (.0002 Mfd.) condenser, connected in series with the

signal generator lead.

Adjust the broadcast band oscillator trimmer condenser (Figure 1)

for maximum output with minimum input from the signal generator.

Then adjust the broadcast band radio frequency and antenna stage

trimmers for maximum output.


6.- Supply e 600 kilocycle signal to the antenna of the recelrer

through the same connections as previously used.

T.- Adjust the broadcast band oscillator padding condenser (top of the

chassis, see Figure 1) for masieum output with minimum Input from

the signal generator, at the same time rocking the tuning conden-

ser back and forth across the signal to Insure the peak of greatest

Intensity.

8.- Check et 1500 kilocycles end then at 600 kilocycles. Make any ad-

juatments that are necessary to obtain satisfactory calibration.


3.- Supply a 20 megacycle signal from the signal generator to the an-

tenna lead of the receiver through a 400 ohm carbon resistor (dum-

my antenna), connected in series with the signal generator lead.

4.- Adjust the short wave band oscillator trimmer condenser (Figure 1)

for maximum output with minleam Input from the signal generator.

Then adjust the short wave band antenna and radio frequency stage

trimmers for maximum output, at the same time rocking the tuning

condenser back and forth across the signal to Insure the peak of

greatest intensity.

5.- The 8 megacycle signal should be received near 8 megacycles on the

dial. If this is not the case check the oscillator tube, switch

connections, the fixed padding condenser and the coils. No adjust-

ment is required at this point.

WARNING

The Imago signal should be received at approximately 19 megacycles

on the dial. If not, the oscillator has been aligned to the image fre-

quency and the oscillator trimmer condenser must be backed out until the

correct signal Is received at 20 megacycles and the Image at approximate-

ly 19 megacycles. If read)estment Is found necessary, the antenna end

radio frequency stage trimmers should also be checked again.

67G .1 eLe 1ST I.F. TRIMMERS

2 ND I. F

TRIMMERS

BROADCAST R OLICE

SHORT-WAVE TRIMMERS

ip eOA

TOLIC[

COLOR CODES

FIRST I. F. TRANSFORMER

SY3 PEAKER CABLE

A.C. CORD

eAa

OSC. TRIMMERS SHORT-WAVE

BROADCAST POLICE

GROUND -BLACK ANTE NNA-BLUE

SECOND I. F. TRANSFORMER

Plate Blue Plate Blue

"B" Plus Red "8" Plus Red

Grid Return Black Diode Return. . . .Black

Grid (Top) Green Diodes Green

STANDARD RMA


1 Brown 3 Orange 5 Green 7 Purple 9 White

RESISTORS The BODY COLOR represents the FIRST FIGURE of the resistance value

The END COLOR represents the SECOND FIGURE of the resistance value

The DOT COLOR represents the NUMBER OF CIPHERS following the First

two figures

MICA CONDENSERS (Capacity in Micro-Microfarads)

The FIRST DOT on the condenser represents the FIRST FIGURE of the capa-

city The SECOND DOT on the condenser represents the SECOND FIGURE of the capa-

city The THIRD DOT on the condenser represents the NUMBER OF CIPHERS follow-

ing the first two figures. The colors on the condensers should be read from left to right with the

condenser In an upright position.

POWER TRANSFORMER

Lead Color

Black 115 Volt Primary

Green 6.3 Volt Filament

Yellow 5.0 volt Filament

Red High voltage Sec.

Red 8 White High Voltage C.T.

Voltage




OHMS FAIRßANKS. MORSF. & CO.

300M

O

500M

750M

0

VOLTS

150

2

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500M 750M

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MODELS 73C3B, 73T3B C has si s 73 Sc hem. tic,Voltage Resistance

VOLTS VOLTS OHMS o

I 0 0

250 200M 3.5

70

ISO

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32 FAIH.-MOHSE

MODELS 73C3B,73T3B Chassis 73

Socket, TriLlaers

Alignment, Data

TRIMMERS 2D 1 E

157 IF

re tie

BROADCAST

POLICE

SHORT-WAVE

TRIMMERS

FAIRBANKS, MORSE &, CO.

V7,7 I

BATRLETERY CA

SPEAKER CABLE

OSC TRIMMERS SNORT -WAVE

BROADCAST

_POLICE GROUND -BLACK ANTENNA -BLUE

POLICE OSC. PADDERS BROADCAST

FIGURE 3 TOP VIEW OF THE MODEL 73 CHASSIS

INTERMEDIATE FREQUENCY ALIGNMENT 1.- Turn the gang condenser to maximum capacity (fully meshed). Set

the band selector switch on the broadcast position. Supply a 456 kilocycle signal from the signal generator to the grid of the first detector tube (6AT) through a .1 Mfd. condenser connected In serles with the signal generator lead.

Adjust the four trimmers of the two intermediate frequency transformers (see Figure 3) for maximum output with minimum Input from the service oscillator.

RADIO FREQUENCY ALIGNMENT The parallel or high frequency trimmer condensers for each colt are housed In the same shield can with the coil except the oscillator trimmers, these are air dielectric condensers and aremounted on the chassis. These trimmers are used for aligning the high frequency end of each band. The location of the various trimmers Is shown in Figure 3.

The oscillator, adjustable, series padding condensers are used for tracking the oscillator at the low frequency end of each band. The padding condensers may be adjusted from the top of the chassis through the holes Indicated In Figure 3. Since a fixed mica padding condenser is employed on the short wave band, no adjustment is necessary. While making padding condenser adjustments, the gang condenser should be rotated back and forth across the signal to Insure adjustment to the peak of greatest Intensity.


variable tuning condenser (maximum capacity), loosen the screw that se- cures the dial pointer place the pointer in a horizontal position (gang condenser still closed and then tighten the screw.

POLICE BAND

1.- Turn the band selector switch to the police band (center) position.



4.- Adjust the police band oscillator trimmer condenser (Figure 3) for maximum output with minimum Input from the signal generator, then adjust the police band radio frequency and antenna stage trimmers for maximum output.


6.- Supply a 2.5 megacycle signal to the receiver through the same connections used on the previous adjustment.

T.- Adjust the police band oscillator padding condenser (topof chassis, see Figure 3) for maximum output with minimum input from the signal generator, at the same time rocking the tuning condenser back and forth across the signal to Insure the peak of greatest intensity.

8.- Check at 6 megacycles end then at 2.5 megacycles and make any adjustments that are necessary to obtain satisfactory calibration.

BROADCAST BAND 1.- Turn the band selector switch to the broadcast (counter -clockwise)

position. FIRST .2.- Tune the receiver to 1500 kilocycles.

I. F. TRANSFORMER 3.- Supply a 1500 kilocycle signal from the signal generator to the Plate Blue

antenna lead of the receiver through a standard dummy antenna or or Plus Red a 200 Maid. (.0002 Mfd.) condenser, connected in series with the Grid Return Black signal generator lead. Grid (Top) Green

4.- Adjust the broadcast band oscillator trimmer condenser (Figure 3) for maximum output with minimum Input from the signal generator. Then adjust the broadcast band radio frequency and antenna stage trimmers for maximum output.


6,- Supply e 600 kilocycle signal to the antenna of the receiver through the same connections as previously used.

7.- Adjust the broadcast band oscillator padding condenser (top of chassis, see Figure 3) for maximum output with minimum Input from the signal generator, at the same time rocking the tuning condenser back and forth across the signal to Insure the peak of greatest intensity.

8.- Check at 1500 kilocycles and then at 600 kilocycles. Make any adjustments that are necessary to obtain satisfactory calibration.

SHORT WAVE BAND 1.- Turn the band selector switch to the short wave (clockwise) posi-

tion.



4.- Adjust the short wave band oscillator trimmer condenser (Figure 3) for maximum output with minimum Input from the signal generator. Then adjust the short wave band antenna and radio frequency stage trimmers for maximum output, at the same time rocking the tuning condenser back end forth across the signal to Insure the peak of greatest Intensity.

5.- The /3 megacycle signal should be received near 8 megacycles on the dial. If this Is not the case check the oscillator tube, switch connections, and fixed padding condenser and the coils. No adjustment is required at this point.

WARNING The Image signal should be received at approximately 19 megacycles

on the dial. If not, the oscillator hat been aligned to the Image frequency and the oscillator trimmer condenser must be backed out until thé correct signal Is received at 20megacycles and the image at approximately 19 megacycles. If readjustment is found necessary, the antenna and radio frequency stage trimmers should also be checked again.

SUGGESTED SERVICE PROCEDURE If the receiver does not operate properly, test all tubes in a re-

liable tube tester or, better still, replace the tubes in the receiver, one by one, with tubes known to be good. Care must be exercised to see that the switch is turned off before any tubes are removed from the receiver, since some of them are two volt tubes, while others are six volt tubes their filaments being connected in a series parallel arrangement. If, after replacing any defective tubes, the receiver Is still Inopera- tive, remove the chassis from the cabinet and conduct a careful resistance and voltage analysis.

The voltage and resistance charts in this manual give detailed In- formation regarding the resistance from various points to various other points in the chassis. The measured voltage from the various tube socket contacts to ground Is also given. When these charts are followed faithfully, little difficulty should be experienced in finding almost any fault that may develop.

NOTE - All adjustments should bemade with the volume control "full on". Any desired variation Insigne' strength should be obtained by adjusting the output of the signal generator.

FUSE in case of difficulty, the fuse located in a metal cartridge near

the end of the positive (red) battery lead should be checked. A 15 ampere fuso, FAIRBANKS -MORSE part number 5605, should be used for replacement purposes.

BATTERY A storage battery having a capacity of at least 135 ampere hours

should be used with the receiver. The storage battery should be located as far from the chassis of the receiver as the battery cables will per- mit. Attach the long, red lead from the receiver to the positive (+) side of the storage battery. Attach the long, black lead from the receiver to the negative (-) side of the battery.

POWER TRANSFORMERS Lead Color Voltage

Black 115V. Primary Green 6.30. Filament yellow 5.0V. Filament Red High Voltage Sec. Red and White High voltage C.T.

COLOR CODES SECOND

I. F. TRANSFORMER Plate Blue "B" Plus Red Diode Return Black Diodes Green




Schematic,Voltage Resi stan e

MODELS 91C4,9105,91T4 FAIRBANKS, MORSE & CO. Chassis 91

RESISTORS CONDENSERS 40. -- 41. -- 42.--

300 M ohms 50 M ohms 500 M ohms

55. -- 56. -- 57.--

1 megohm 1 megohm 3 M ohms

43.-- 500 ohms 58.-- 500 M ohms 44.-- 50 M ohms 59.-- 50 M ohms 45.-- 50 M ohms 60.-- 500 M ohms 46.-- 2 M ohms 61.-- 250 M ohms 47.-- 10 M ohms 62.-- 500 M ohms 48.-- 1 megohm 63.-- 250 M ohms 49.-- 2 M ohms 64.-- 10 M ohms 50.-- 300 ohms 65.-- 2 megohms 51.-- 50 M ohms 66.-- 400 M ohms 52.-- 500 M ohms 67.-- 40 M ohms 53.-- 500 ohms 68.-- 5 M ohms

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MODELS 91C4,9105,91T4 Chassis 91 Socket, Trimmers Alignment, Data


NOTE -Ail adjustments should be made with the volume control "full on". Any desired variation in signal strength should be obtained by adjusting the output of the signal generator.

TRIMER, SL SECOND I.L Ply,

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FIGURE 4 TOP VIEW OF THE MODEL 91 CHASSIS

INTERMEDIATE FREQUENCY ALIGNMENT 1.- TuryN the gang condenser to maximum capacity (fully meshed). Band

switch on broadcast position.

2.- Supply a 456 kilocycle signal from the signal generator to the grid of the first detector tube through a 1 Mfd. condenser connected in series with the signal generator lead

T. - Adjust the police band oscillator padding condenser (top of chassis, see Figure 4) for maximum output with minimum Input from the signal generator, at the same time rocking the tuning condenser back and forth across the signal to Insure the peak of greatest intensity.

8.- Check at 5.4 megacycles and then at 1.8 megacycles and make any adjustments that are necessary to obtain satisfactory calibration.

SHORT WAVE BAND 1.-

5. -

Turn the band selector switch to the shortwave (clockwise) position.

Tune the receiver to 18 megacycles.

Supply an 18 megacycle signal from the signal generator to the antenna lead of the receiver through a 400 ohm carbon resistor (dummy antenna), connected in series with the signal generator lead.

Adjust the short wave band oscillator trimmer condenser (in Figure 4) for maximum output with minimum input from the signal generator. Then adjust the short wave band antenna and radio frequency stage trimmers for maximum output, at the same time rocking the tuning condenser back and forth across the signal to insure the peak of greatest intensity.

The 6 megacycle signal should be received near 6 megacycles on the dial. If the signal is not received check the oscillator tube, switch connections, the fixed padding condenser and the coils. No adjustment is required at this point.

6.- Check and, If necessary, readjust all three stages for maximum output with minimum input from the signal generator.

WARNING 3,- Adjust the four trimmers of the two intermediate frequency trans- The Image signal should be received at approximately 17 megacycles lºs formers (see Figure 4) for maximum output with minimum input from

the service oscillator. on the dial. If not, the oscillator has been aligned to the image frequency and the oscillator trimmer condenser must be backed out until the

RADIO FREQUENCY ALIGNMENT correct signal is received at 18 megacycles and the Image at approximately 17 megacycles. If readjustment is found necessary, the antenna

The para t lei or high frequency trimmer condensers for each coil are and radio frequency stage trimmers should also be checked again. housed in the same shield can with the coil, with the exception of the oscillator trimmers, these are air dielectric condensers and are mounted ULTRA SHORT WAVE BAND on the chassis. These trimmers are used for aligning the high frequency end of each band. The location of the various trimmers is shown in Fig- No adjustment Is required on this band. If signals are not pro- ure 4. perly received check the oscillator tube, switch contacts, the fixed

The oscillator, adjustable, series padding condensers are used for padding condenser, and the coils.

tracking the oscillator at the low frequency end of each band. The padding condensers may be adjusted from the top of the chassis through the holes Indicated in Figure 4. Since a fixed mica padding condenser is employed on the short wave band no adjustment Is necessary. While making padding condenser adjustments, the gang condenser should be rotated back and forth across the signal to Insure adjustment to the peak of FIRST SECOND greatest intensity.

BROADCAST BAND 1.- Turn the band selector switch to the broadcast (clockwise) position.


3.- Supply a 1500 kilocycle signal from the signal generator tothe antenna lead of the receiver through a standard dummy antenna or a 200 Mmfd. (.0002 Mfd.) condenser, connected in series with the signal generator lead.

4.- Adjust the broadcast band oscillator trimmer condenser (Figure 4) for maximum output with minimum Input from the signal generator. Then adjust the broadcast band radio frequency and antenna stage trimmers for maximum output.


Supply a 600 kilocycle signal to the antenna of the receiver through the same connections as previously used.

Adjust the broadcast band oscillator padding condenser (top of chassis, see Figure 4) for maximum output with minimum input from the signal generator, at the sane time rocking the tuning condenser back and forth across the signal to insure the peak of greatest intensity.

8.- Check at 1500 kilocycles and then at 600 kilocycles. Make any adjustments that are necessary to obtain satisfactory calibration.

POLICE BAND 1.- Turn the band selector switch to the police band (center) position.


3.- Supply a 5.4 megacycle signal from the signal generator to the antenna lead of the receiver through a 400 ohm carbon resistor (dummy antenna), connected in series with the signal generator lead.

4.- Adjust the police band oscillator trimmer condenser (Figure 4) for maximum output with minimum input from the signal generator, then adjust the police band radio frequency and antenna stage trimmers for maximum output.


6.- Supply a 1.8 megacycle signal to the receiver through the same connections used on the previous adjustment.

COLOR CODES

L F. TRANSFORMER I. F. TRANSFORMER Plate Blue Plate Blue 'B" Plus Red "B" Plus Red Grid Return Black Diode Return. . .Black Grid (T00) Green Diodos Green

STANDARD RMA

RESISTOR AND CONDENSER COLOR CODE 0 Black 2 Red 4 Yellow 6 Blue 8 Grey 1 Brown 3 Orange 5 Green 7 Purple 9 White

RESISTORS The BODY COLOR represents the FIRST FIGURE of the resistance value The END COLOR represents the SECOND FIGURE of the resistance value The DOT COLOR represents the NUMBER OF CIPHERS following the First two figures

MICA CONDENSERS (Capacity in Micro-Microfarads)

The FIRST DOT on the condenser represents the FIRST FIGURE of the capacity

The SECOND DOT on the condenser represents the SECOND FIGURE of the capacity

The THIRD DOT on the condenser represents the NUMBER OF CIPHERS following the first two figures.

The colors on the condensers should be read from left to right with the condenser In an upright position.

POWER TRANSFORMER Lead Color Voltage

Black 115 Volt Primary Green 6.3 Volt Filament Yellow 5.0 Volt Filament Red High Voltage Sec. Red a. White High Voltage C.T.



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FREED PAGE 8-1

MODEL FE -33 3 TUBE A.0-D.C. T.R.E RECEIVER

B.C. BAND -550-1600 K.C.

FFEEO MANUFACTURING CO-. INC. NEW YORK, N.Y., U S A.

OCTOBER 1936. PRINTED IN U S.A

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