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PAGE 2-2 GEN. MOTORS

MODEL Day -Fan A-5005 A-5020

Chassis GENERAL MOTORS RADIO CORP.

DAY-FAN MODEL A-5005 MODEL A-5020

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Illus. No.

Part Number Description Illus.

No. Part

Number Description

1 26758 Screw 18 26568 Mounting Bracket 2 138164 Lock Washer 19 1201604 Resistor, 500,000 Ohms 3 14609 No. 1 R. F. Coil 20 21678 Screw 4 14650 Antenna Coil 21 138475 Shake -proof Washer 5 14556 Choke Coils 22 25591 Nut 6 14603 No. 2, 3, 4 R. F. Coils 23 1200473 Condenser, .1-.1-.1 Mfd. 7 14766 Trimmer Drive Pulley & Pin 24 14597 Output Transformer 7 26682 Belt 25 1200167 Voltage Divider 8 14351 Knob 26 14594 Speaker Plug Receptacle 9 26679 Trimmer Shaft 27 24981 Strap

10 14591 Selector Bracket Assem. 28 26562 Spring 11 26175 Selector Shaft 29 24901 Spacer 12 14664 Knob -Tuning Condenser 30 1200195 Fuse Block Assem. 13 14 15 16

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17 1201610 Resistor, 25,000 Ohms 34 14566 Terminal Strip Assem. 17 14686 No. 4 Condenser 35 14624 Local and Distance Resistor.



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MODEL 216, 217 219, 250

(S -1A, S -1B) Sohematio

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MODEL 216,317 219,250

(s-1,\, s -1B) GENERAL MOTORS RADIO CORP, Voltaffe -Data

MODEL 216, 217, 219, 250 SUPERHETERODYNE RECEIVERS.

ANTENNA AND GROUND CONNECTIONS

On Models 216, 217 and 219 a special antenna is installed in the cabinet and

an antenna and ground terminal strip with three clips is located, on the bottom of

the speaker baffle board.

If an outside antenna and ground are used, connect the antenna lead-in wire to the clip -marked "A" and the ground wire to the clip marked "G". The jumper wire

provided should connect clips marked t'G" and "X".

If the local reception special antenna in the cabinet is used, connect the

special antenna iced to the clip marked "A". The jumper should connect clips mark-

ed "G" as d "X".

Ir the power line is to be used as en antenna, simply connect clips "A" and

r f the jum er If pAA4hle connect a ground wire to clip marked "G". b X y m s ean o p

CONDENSERS Voltage Divider

NO. CAPACITY N0. CAPACITY LEAD COLOR

Cl .00001 Mfd. C7A .25 Green

C2 .0005 Mfd. C7B .25 Green Brown 15,000 Ohms C3 .002 Mfd. C7C .1 Brown

C4 .01 Mfd. C7D .25 Terminal

C5 .1-.l Mfd. C7E .006 Red

C6 .1 Mfd. C7F .25 Green C7G .03 Blue C7H .03 White -White Red 25,000 Ohms

C8 4-4 Mfd. (Electrolytic)

C9 8 Mfd. (Electrolytic) pentode Bias Condensers C7A to C7H, inclusive, are included in the

Be -Pass Condenser Pack. T?ESISTOIS

N0. BODY SID SPOT RESISTANCE WATTS Green 52,000 Ohms

Rl Yellow Green Red 4,500 I R2 Red Green Orange 28,000

R3 Xellow Black Orange 40,000 -i

Red 200,000 Ohms

ill Drown Black Yellow 100,000 it

R5 Green Black Yellow 500,000 2 R6 In Metal Cover 400

Type Position Control Screen Pentode Normal

of of Fil. Plate Grid Grid Cathode Screen Plate

Tube Tube Volts Volts Volts Volts Volts' Volts M.A.

224 1st Det. 2.1 225 2.0 85 7 -- 1

235 1st I.F. 2.1 225 3.3 79 5 -- 14

235 2nd I.F. 2.1 225 3.3 75 5 -- 13,

227 Oscillator 2.15 75 0 -- 0 -- 5

227 2nd Det. 2.15 125 15.0 -- 15 -- 1

247 A. F. 2.15 210 1.0 -- -- 200 3.5

280 Rect. 4.5 300 -- -- -- -- 25-25

Line Volts 110. Volume Control on Full.



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MODEL 251 (S-2A,S-2B) Sohernatio

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MODEL 251 (S-2A,S-2B) Voltage -Data GENERAL MOTORS RADIO CORP.

MODEL 251 SUPERHETERODYNE (CHASSIS MODELS S2A & S23)

Type Position Control Screen Pentode Normal Rated

of of Fil. Plate Grid Grid Cathode Screen Plate Fil.

Tube Tube Volts Volts* Volta Volts Volts# Volts MA Volts

224 1st Det. 2.1 255 1.9 77 6.0 1.0 2.20

235 1st I.F. 2.1 200 .3 100 95.0 Mi 1.6 2.20

235 2nd I.F. 2.1 200 .3 100 95.0 M 1.6 2.20

227 2nd Det. 2.15 145 .0 Y 15.0 .5 2.25

227 Osc. 2.15 75 .0 0 7.0 2.25

227 A.V.C. 2.15 60 .0 M 0 .0 2.30

247 A.F. 2.15 235 1.0 215 30.0 2.30

280 Rect. 4.5 200 -- 30-30 4070

Line Volts 110

* Use 600 Volt Scale.

Volume on Full

# Measured from Cathode to Heater.

Pentode Bias

Black Spot

Brown Body

133,500 Ohms

23,000 Ohms

21,500 Ohms

Voltage Divider

Soli

Br

Body

4,800 Ohms

,600 0hmr

6,900 Ohms

. Capacity

CIA .1 I+tfd.1 By -Pass Cond.

C1B 1.0 Mfd.) Pack No. 1

C2A .03 Mfd. C2B .1 Mrd. C2C .006 Mfd. Br -Pass Cond.

C2D .25 Mfd. Pack No. 2

C2E 1.0 Mfd. C2F .25 Vtd. C2G .1 Mfd C3 .00001 Mid. C4 .00025 Mfd. C5 .00075 Mfd. C6 .002 Mfd. C7 .01 Mfd. C8 1.0 Mfd. C9 4.0 Mfd. C10 8.0 Mfd.

(Electrolyt4 (Electrolyt.

No.

111

R2 R3 R4 R5 R6 R7 R8

Body

Orange Yellow Red Yellow Brown Red Green Red

End

Black Green Green Black Black Green Black Black

Resistors

Spot

Brown Red Orange Orange Yellow Yellow Yellow Green

The dial light bulb is a Mazda No. 41,

Resistance Watts

300

4,500 25,000 40,000

100,000 250,000 500,000 2 Megohms

rated at e volts.



v

v of

GENERAL MOTORS RADIO CORP. Chassie Modele S3A, S3B, S4A.S4B

2 DC I IF 2 IF 0 0 0 27 35 35

A.V.0 I DET 0 0 '27 '2/A

C ' AF RF RECT e30 0 0 '35 '80 'ß OSC

o PILOT 2.5 V 27

FRONT

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S -3-A 110 VoltS, 60 Cycle. S -3-B 110 VoltS, 25 Cycles

108 WATT=

MODEL 252,253,254, 255,256,257, 258

(S -3A, S -3B) Schematic



MODEL 252,253,254, 255;256,257; 258 GENERAL MOTORS RADIO CORP. S -3B)

Voltage -Data

MODELS 252, 253, 254, 255, 256, 257, 258 SUPERHET. RECEIVERS. (CHASSIS MODELS S3A & S3B)

type Position of of Fil.

Tube Tube Volts

Plate

Volts

Control

Grid Volts

227 Oscilla» 2.1 65 .3

t or

235 R. F. 2.1 230

224 1st Det. 2.1 230

235 1st I.F. 2.1 230

235 2nd I.F. 2.1 230 5.0

237 2nd Dot. 2.2 205 23.0

227 A.V.C. 2.2 25 2.5

245 A.F. 2.2 230 20.0

245 A.F. 2.2 230 20.0 280 Rectifier 4.5 330

Line Volts. 110

Screen Grid Cathode

Volts Volts

Ma» 7

.5 77 2.5

5.0 65 5

.5 77 3

60 10 ».. 23

. 30 ..r 10»

w gm»

Volume Control on Full

Normal Plate Grid M.A. Change

5 0

6

1

5

s

1

0 0

30 35

30 35

30-30

3.5

,3 3.5

3.5

4.0

No.

Cl

C2

C3

C4 C5

C6 C7

08

CONDEN SERS

CAPACITY

1.0 - 1.0 m .1 - .1 - .1 Mfd.

.5 - .5 - .5 - .1 - .1 - .l btfd

5 Mmfd. .0007 Mfd. .00075 Mfd. .002 Mfd. .02 Mfd. .5 Mfd.

8.0 Mfd. (Electrolytic)

Black, Yellow Spot

Black, Yellow Spot

Brown, Yellow Spot

245

Bias Resistor

100,000 Ohms

100,000 Ohms

110,000 Ohms

NO.

Rl 11.2

R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13

BODY

Brown Lavender

Green Blue Brown Brown Yellow Brown Orange Green Red

RESISTORS

END SPOT

Green Green

Solid Lavender Black Black Black Gray Black Brown Black Black Black

Solid Orange

The dial light bulb i : a Mazda

Brown Brown

Orange Red Orahge Orange Orange Yellow Yellow Yellow Green

No. 41

RESISTANCE

150 750

1250 50,000 6,000

10,000 18,000 40,000 110,000 300,000 500,000 2 Me gohms

14,550

rated at 2'--,

WATTS

1

1

3

volts.




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The single i -f trimmer is

adjusted by means of a screw which is reached thru a hcle in the back of the chassis, be.lovr the i -f trans.

p,

MODEL 220 (S-l0A,S-10B) Schematic

F z o

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Black to GPD.

Red to

Ant. #1

Trans.

1st Det. Tube

OscillatoF Tube

MODEL 220 (S-10A,S-1OB) Trimmer Notas


PEAKING THE I.F. STAGES

CONNECTIONS

(1) Connect the test osoillator to the control grid of the first detector

tube, with a fixed .002 Mfd. condenser connected in series between the test oscillator and the grid terminal of the tube. The grid cap and lead must be left in place on the tube. Connect the GND terminals of both the test oscillator and the receiver to a common ground.

NOTE: DO NOT CONNECT TO THE GRID OF ANY OTHER TUBE BECAUSE

IT WILL CHANGE THE BIAS VOLTAGE OF THE SET.

If the test oscillator has a dummy antenna whioh cannot be disconnected, connect a 1 megohm resistor between the test oscillator output terminal

and ground. (2) Remove the 227 oscillator and the 227 A.V.C. tuba and plug the dummy

oscillator and A.V.C. tubes in their sockets.

TRACKING PROCEDURE

(1) Feed a signal of exactly 1400 K.C. into the chassis from the test

oscillator. (2) Screw all parallel trimmers down tight and then adjust the oscillator

parallel trimmer condenser to obtain a maximum output. (3) Adjust the remaining parallel trimmer condensers to obtain maximum

output. NOTE: Modela S10A or SlOB chassis do mot employ an oscillator

series condenser. It is not necessary to make the tracking adjustment at 580 K.C.

2nd.I.F.Trimmer Z.F_iTube 2nd I2et.Tube`%

l

Power :;z^plif:.er

A.7.0. J.0.

Tun-,

0-Jc i l.la to r

l'rallel Trimmer


MAJESTIC PAGE 2-1

OUTPUT TRANSFORMER

SPEAKER TER MINA -s

1d

FER MINA L;TRIP

GRIGSBY GRUNOW CO.

INPUT TRANSFORMER I ST. AUDIO SELECTIVITY CONTROL

DETECTOR BY - PASS

AUD 0 S)CY.ETS

N

TUNING DIAL

J

VOLUMETRÖL

R.F. PLATE BY - PASS ANTENNA

COIL TRIMMER CUP

MODEL 70-B Chassis

I R.E.FFILAMENT BYPASS GRID GROUND LEAK

GRID LEAK

TERMINAL STRIP TO POWER UNIT

SHORT AERIAL

LONG .0003 AERIAL CONDENSER

Model 70-B Chassis

A.F. BIAS DET.C.T. R F.BIAS RF,C.1.

!A

4

Bottom View of Terminal Board in 70-B Chassis, Showing Resistors Employed

5 VOLTS I) POWER 154 VOLTS

A.F. 2% VOLTS

DET.

154 VOLTS R.F.

B 96 - - B + 260 VOLTS

1000 -OHM RESIST -

5 VOLTS POWER

5 VOLTS POWER

154 VOLTS A. F.

156 VOLTS A. F.

2% VOLTS DET. - 254 VOLTS DET. - 1 % VOLTS R. F

154 VOLTS R. F. - B + 260

B + 96 VOLTS - B + 50 VOLTS

B-

.002 BY-PASS CONDENSER

GRID CONDENSER

GRID LEAK

Cable for 70-B Chassis, Showing Resistors, Grid Condenser

and Leak, and Voltages at Terminals.


PAGE 2-2 MAJESTIC

MODEL 180 Chassis

s

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a

eluss vNlwar3

> '>

113V01O4SNVtl1 1N3WVlI1

31OV1d3O3a a3MOl 01.

SNVS N3SN30NO3


MAJESTIC PAGE 2-3

SELECTIVITY

P r.° v1LS A ,1)

R.F.SOCKETS G-27

YODEL 90 MODEL 100 Chassis

VOLUME

DETECTOR SOCKET

DE-.PLATE CHOKE

BY-PASS CON D I.MF.

35,000 OHM L GREEN - 1,800 OHM

BLUE TERMINAL

BOARD 1.60HMC.T.

-- CAB LE TO POWER UNIT

r ßY --PASS .CONO. BdLA'y(SINu --C -h.55 ANTEN NA - '

5 MF. t,(_4D. ,5 F. AND CifiOLVD S-RID L- R,F.I.HCAE

Poyi[iín of Parts, ard V:ir ¡reg cF Model 9{ Re:.tiíver.

t9'! -PASS CON C7._..5 M F

R.F.SOCKET5 G-27

Model 100

Pd%:CDiO PYICIN¿}_i.E.ì_ i"t!NING

Y' -PASS Ctx+D MF. CO 'D

'tC:t : BY A^t FNN 1= r-faj (>0? -4 D. 5 MF _._A GRC ,:ND P

G-45 SOCKETS

SPEAKER TERMINALS

.001 MF.

.00005 MF. TRIMMER ANTENNA COIL

RAOIOPHONO.SWITCH BY-PASS COND.

I. M F

35.000 OHM GREEN

1,800 OHM BLUE

TERMINAL BOARD

1.6 OHM G.T. . CABLE TO POWER UNIT

AUTO TRANSFORMER

G-45 SOCKETS

r"--1 SPEAKER TERMINALS

.001 MF.

R. F. CH04E


PAGE 2-4 MAJESTIC

MODEL 15 Schematic Below Serial 65149

GRIGSBY - GRUNOW CO. rb apO of 34qq"

WC

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ini ó2

0 ói

C1

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Z-, 14 i

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Model 15 Chassis Employed in Havenwood, Ellswood and Sherwood Models


MAJESTIC PAGE 2-5

G-24 1ST DET.

OSCILLATOR

VOLUME CONTROL GRIGSBY - GRUNOW CO. d ON AND OFF SWITCH ACOUSTIC CONTROL

11,500 n STATION SELECTOR & STATIC MODIFIER

2ND R.F. COIL TUNING COND..

10,000,,

700-1100 M M.F. D

OSCILLATOR TRACKING CONDENSER

700-1100 M. M.F. D

0.1' M.F.D. BY PASS COND

25,000,,

0.6 M.F.D. SCREEN

BY PASS COND.

0.1 M.F.D. BY PASS COND.

40,000,,

0.5

.0005 M.F.D. PLATE

BY PASS COND.

200,000,,

I-

20

100,000 ,. G -24S I 30 000,, 2ND DET.

ANT STAGE TUNING CONO.

It

300,000,, LOCAL -DISTANCE SWITCH

á P P O N

Table of Voltages to Ground

MODEL 15 Chassis Views

2ND R.F. COIL

0.25 M.F.D. BY PASS COND

MEG, OHM RESISTOR

8 M.F.D. EACH

OSC. STAGE TUNING COND.

Bottom View Model 15 Chassis

05CALLATDE Tg4CKING OSCILLATOR CONO. ON SIDE of BASE COIL

r 1st I. F. ASSEMBLY.

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PAGE 2-6 MAJESTIC

MODEL, 15,15-B Sohematio Above Serial 65150

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Model 15B Chassis Employed in Fyfewood Model


MAJESTIC PAGE 2-7

ALIGNING CONDENSERS

ANTENNA COIL

700--1100 M.M.F. D OSCILLATOR TRACKING CONDENSER

0.5 N.F.D.

0.0009 M.F.D.

0.1 M.F.O. CONOS.

2000 RESISTOR

05 M.F.D.

MEG..

300.000 ..

ACOUSTIC CONTROL VOLUME CONTROL

& STATIC MODIFIER & ON AND OFF SWITCH

STATION SELECTOR

POWER TRANSFORMER ONO. ANT

Top View Model 15B Chassis

VOLUME CONTROL d ON AND OFF SWITCH

11.500

100.000 .. RES STOB

DTATICN SELECTOR

1

A.C. LINE COND. 01 M.F.D. EACH

.0005 M.F.D. ANT STAGE DETECTOR SV TUN!.NG PASS COND CONO

Bottom View Model 15B Chassis

F. ALIGNING CONDENSERS

ACOUSTIC CONTROL A STATIC MODIFIER

50.000

MODEL 15-B Chassis Views

OSCILLATOR COIL

1,11 F. ASSEMBL2

SHIELD

2nd I F.

ASSEMBLY

.03 M.F.D. JOSE CONTROL

2N0 O.F CGII

8 M.F.D. EACH

OSC STAGE COND


PAGE 2-8 MAJESTIC

MODEL 25 Schematic

GRIGSBY - GRUNOW CO.

Model 25 Chassis Employed in Brentwood, Cheltenwood and Brucewood Models


FILTER COND 8 M.F.D. EACH

R.F. STAGE TUNING COND

FILTER CHOKE

VOLUME CONTROL a ON AND OFF SWITCH

65*1 STATION SELECTOR

OSC. STAGE TUNING COND.

8-518 ONty

ACOUSTIC CONTROL a STATIC MODIFIER

86.000 .

G27 OSCILLATOR

DETECTOR PLATE BY

PASS COND. .001 M.F.D.

50M.M.F.D.

SIZE G51 I.F.

AMPLIFIER

PLATE CHOKE

MAJESTIC PAGE 2 9

MODEL 25 Chassis Views Voltage

G27 2ND DET.

BY PASS COND. WITH .25M.F.D.5 M.F.D .1M.F.D.3M.F.D.03 M.F.O

100 000

DETECTOR A F CHOKE

PLATE CHOKE

G51 I.F. AMPLIFIER

15,000 .. WATT SIZE

PUSH PULL INPUT TRANS.

Bottom View Model 25 Chassis

Table of Voltata to Ground Model 25


PAGE 2-10 MAJESTIC

MODEL 25-B 251,253,254

Scher.iatio GRIGSBY - GRUNOW CO.

MAJESTIC MODEL 25B CHASSIS

RECEIVER MODELS CHELTENWOOD (251)- BRENTWOOD (253) BRUCEWOOD (254)

SCHEMATIC DIAGRAM OF MAJESTIC SCREEN GRID SUPERHETERODYNE AUTOMATIC KRUME CONTROL RECEIVER-MODEL 25-B CHASSIS -1/5 q..a23O1 TS 25 AND 50 -GO c,-cLes

POYVER REQD - /2O YMATT s

GIP? - ONCKc4TOR

Lier GN.

7

PEAK FREQUENCY 175 KC

T

-27-5 Oe*ec7oR

h

14-'f Zsdi . n.t.

aqñ P'pr CG

ra. .ez. ósieyPD0.06.r

5óe, r Gaon 7I'r G+0 <bit G -i)

SMqKlR

The audio system is tuned to give full bass response as !ow as forty cycles, also an image rejector circuit is used in

the Fie -selector to reduce image response.

Power Supply System

The power supply system on the Model 25B Chassis consists of a power transformer, G80 rectifier, filter choke

inm.dl 'pesky field 3 mfd paper condenser and rwn R m.fd rlrrrrnlynr condensers.

Color Code for Model 25-B Power Transtormer Start of Primary Yellow Center Tap No. 1 Heater ...Red Finish of Primary Yellow Finish of No. I Heater .Black

Start of Anode.. ... . Red Start of No. 2 Heater Yellow

Center Tap (Anode) .. Black Finish of No. 2 Heater. Yellow

Finish of Anode.... Red Start 5 v. Fil. .. . .. Black

Start of No. 1 Heater Black Finish 5 v. Fil... _-_ Black

MODEL 26-B Line 115 Volts Vol. C ntr Max.

CIRCUIT FIL. PLAT E F.to GkliD. CAT H. CURRENT S.G.VOLTS S.G.CURRENT

G -51-S R.F.Amp. 2.5 260 3 4.2 90 1.2

G -51-S 1st Det. 2.5 260 7 1.3 90 .4

G-27 Ono. 2.5 9C 3 3.5

G -51-S I.F. 2.5 260 5. 90 1.6 G -27-S 2nd Det. 2.5 135 16 ... 14.

G -27-S 2nd Det. 2.5 135 16 .... 14. f G-47 Power 2.5 250 16 .... 30 250 7.2

G-47 Power 2.5 250 16 ¡ .... 30. 250 7.2

G-80 Reot. 5. .... 400 .... 120 Total


MAJESTIC PAGE 2-11

1. G47 Pentode Audio Amp- lifier Tubes

2. Power Trennformer 3. Tone Control 4. Aligning Condensers 5. Oscillator Coil


MODEL 25-B 251,253,254

Chassis Views

Top View of Model 25B Chassis 6. Tuning Control 10. G.27.S Second Detector 15. G.51.S R. F. Amplifier Tube' 7. R. F. Coil Tubes 16. Ground Port 8. G27 Oscillator Tube 11, 2nd 1. F. Transformer 17. Amens Coil 9. Volume Control and Line

12. G-51 I. F. Amplifier Tube 18. Local- 'Distance Switch 13. First 1. F. Transformer 19. Antenna Post

On -08 Switch 14. G.3IS 1st Detector Tube 20. C.80 Rectifier Tube

Bottom View of Model 25B Chassis 1. 8 mid. Cond. (2) 8. .03 mid. Local -Dis. 15. 15.000 Ohm ResistoNus 26. 'Can A" Cond. As- . 32. .00005 mid. Mica 2 3 mid. and .15 mid. tance Cond. (Cartridge) 16. Push -Pull Input Choke sembly Cond.

.Cond. 9. Local -Distance Switch 17. 160 Ohm Resistor % 27. mid. Mica 33. .1 mid. Cond. 3. R. F. Stage Tue:ng

Cond. 4. G-47 P.P. Audio Sock-

et. 5. Filter Choke

10. 11. 12.

13.

100,000 Ohm Resistors. .1 mid. Cond.(cart:iye) G.51.5 First Det. Socket "Can C" Coed. Ar

18. 19. 20. 21. 22.

R. F. Choke G -51S I. F. Amplifier Det. Plate A. F. Choke 100,000 Ohm Resistor% 250,000 Ohm Reistor%

28.

29.

.00015 Cond. Volume Control and Line Switch .006 Mid. Mica Cond.

i4.

35.

Oscillator Stage Tun. ing Cond. Oscillator Tracking Coed.

6. G-80 Rectióer,Sodtet eembly 23. 500.000 Ohm Reistot% 30. 0.27.5 2nd Det. Sock - 36. Tone Control 7. Ant. Stage Tuning 14. G -51S R. F. Amplifier 24. 800 Ohm Resistor a era 37. .03 mid. Tone Control

Cond. Socket 25. 20.000 Ohm Reistor 3111 31. 627 Oscillator Socket Cond.


PAGE 2-12 MAJESTIC

MODEL 35 351,353

Schematic GRIGSBY - GRUNOW CO.

MODEL 35 CHASSIS

RECEIVER MODELS ABBEYWOOD (353) and COLLINGWOOD (351)

SCHEMATIC DIAGRAM OF MAJESTIC SCREEN GRID SUPERHETERODYNE AUTOMATIC VOLUME

CONTROL RECE/VER. M,ODEL_M CRASS/S-COLLINGWOOD MODEL l- //5 AND 230 VOLTS, 25-50 AND 50-60 CYCLES POWER READ.-/50 WATTS.

Fn..* C/eN>r

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PEAK IrREQUENCI 175 IC ,/

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Radio -Phonograph Switch Both the COLLINGWOOD and ABBEYWOOD Models have a radio -phonograph switch which is lo-

cated below the central control or station selector. This switch is turned to the right for radio operation and to the left for phonograph operation. There are pick-up terminals on the Model 35 chases employed in both these sets, although the COLLINGWOOD Model is not a combination receiver. There shadd always be a jumper across the pickup terminals when the pickup is not attached.

Power Supply System The power supply system of the Model 35 chassis consists of a power transformer, G-sO rectifier, a filter

choke which is tuned to hum frequency, a 4 mfd. paper condenser, and two 8 mfd. electrolytic condensers. The

condenser employed across the filter choke is a .15 mfd. for sixty cyde operation, and a .35 mfd. for twenty-five

cyde operation. The output from this filter section passes through the fields of both dynamic speakers wisich act

as additional chokes to the filter circuit.

Mfaa.,oIR\ n

F/G. /2/ Nra'U 1 v-arrt , >ar

//-e.0/

'MODEL 35 Line 115 Volts

TUBE CIRCUIT FIL. PLATE F.to GRND.CATH.CURRENT S.G.VOLTS S.G.CURRIILIT

G -51-S R.F.Amp. 2.5 266 4 5 90 0.5 G -51-S ist Dot. 2.5 265 8 1 90 0.5 G-27 Ose. 2.5 90 4 11-51-S ist I.F. 2.5 265 4 5 90 0.5 G -51-S 2nd I.F. 2.5 4265 4 5 90 0.5 G -27-S 2nd Det, 2.5 115 ... 12

G -27-S 2nd Let. 2.5 115 . . 12 G-47 Power 2.5 250 16.5 ... 32 260 7

G-47 Power 2.5 250 16.5 ... 32 260 7

G-80 Rect. 5.0, ... 130 Total


MAJESTIC PAGE 2-13


MODEL 25-B MODEL 36 Alignment

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2. G27S Push -Pull Detec- tor Tubes

3. Phonograph Pickup Connections

4. G47 Pentode Tubes 5. Gang Aligning Con-

densers 6. G27S Oscillator Tube 7. G80 Rectifier Tube 8. G5IS R. F. Tube 9. 2nd I. F. Transformer IO. G5IS2ndI.F.Tube II. 1st I. F. Transformer 12. G51S 1st I. F. Tube 13. G515 1st Detector

Tube 14. Volume Control On.

Off Line Switch t 5. Station Selector 16. Acoustic Control

4 v Top View of Model 35 Chas6is

l


PAGE 2-14 MAJESTIC

MODEL 35 351,353

Chassis Views GRIGSBY - GRUNOW CO.

Q ls

21 19

View Showing Power Supply Circuit of Model 35 Chassis 1. 2-8 mid. Electrolytic Condenan 5. 110 V. Line Coed -On and Off Switch and

2. 2.5 V. to G47 Scorn. 8 mid. Electrolytic Cond. Det. Audio Choke and G14 Speaker Field

3. 2 mfd. Cond. Det. Audio Choke and Sec- ond Det. Plata

4. 2 mid. Cond. and Volume Control

I. R. F. By Pass Condensers Can "A" 2. 100,000 Ohm Resistor 3. 9,000 Ohm Resistor x 4. 400 Ohm Resistor X 5. 100,000 Ohm Resitor 6. 140 Ohm Resistor %

7. .1 mfd. Condenser 8. G27S Oscillator Tube Socket 9. 100,000 Ohm Resistor

10. Oscillator Tracking Condenser I. G51S Tube Sockets

12. 100,000 Ohm Resistor 13. R. F. By Pan Condenser Can "B" 14. 5000 Ohm Raisin it. 15. 3rd I. F. Transformer

16' 1 G47S Tube Sockets 18. 1

17. 100.000 Ohm Rautor 19. .002 enfd. Condenser (Nit.) 20. 100,000 Ohm Resistor

.01 6. 110 V. tine Cord -Printery Switch and .01

Cond. 7. G47 Plate and Input to Speakers 8. G47 Plate and Input to Speakers 9. Power Filter Choke G -10C Speaker Field,

.15 Cond. and 8 mfd. Electrolytic Cond.

11 137 13 15

Ip 38 12 14 16

Interior View of Model 35 Chassis (a [a.tan )

21. 250.000 Ohm Resistor x 22. 500,000 Ohm Resistor et

23. 1000 Ohm Resistor w

24. .006 mfd. Condenser (it". 25. G27S Push -Pull Detector Sockets

10. G80 Fil., Filter Choke 4 mid. Paper Cond. and .15 Conti

G51S Filament.

13. l2.

14. 1 G47 and G27S Filament,

15. Fuse 16. G80 Rectifier Socket 17. 210 Ohm Resistor 18. 125 V. Primary Tap 19. 115 V. Primary Tap 20. 105 V. Primary Tap 21. line 22. Audio Frequency Choke 23. Junction GIOC-014 Speaker Fields

26. 100.000 Ohm Rninor 27. Push -Pull Input Transformer 28. .25 Tone Control Condenser 29. Tone Control 30. .001 mfd. Condenser 31. 'Radio Phono" Switch 32. Manual Volume Control and (Off

and On) Line Switch 33. 10,000 Ohm Resistor l ware 34. 13,000 Ohm Resistor J tan4 35. Link R. F. Coil 36. R. F. Coil 37. Antenna Coil 38. Oscillator Coil


MAJESTIC PAGE 2-15


MAJESTIC CHASSIS MODELS 25-B and 35

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CHASSIS 25-B DYNAMIC SPEAKER MODEL G -10-C

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PAGE 2-16 MAJESTIC

MODEL 353 Record cwange r Note s GRIGSBY - GkUmÜW CO.

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MAJESTIC PAGE 2-17


PAGE 2-18 MAJESTIC

MODEL 120 Sohemetic

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MAJESTIC PAGE 2-19

MODEL 120 Chassis Vieux

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PAGE 2-20 MAJESTIC

MODEL 120 Notes


G-32

rì3t iíatuïx LOW FREQUENCY

Ai.7GN#NG CONDENSER

G-30 G-32

120 CHASSIS

G-32 G-32

1 f AL CiNtti' ..

CONDENSERS

G33

I. F. Transformers Alignment

I. Connect oscillator for intermediate frequency alignment and set it in operation.

2. Align each aligning condenser on the intermediate frequency transformers to give maximum signal output.

3. After all four condensers have been aligned at 175 kilocycles, this stage should not )e again adjusted.

R. F. and Oscillator Alignment 1. Tune in station in the vicinity of 1,500 kilocycles, or put output of local oscillator

(if available) into receiver

2. Align R. F. stages and oscillator tuning condenser The position of these condensers is shown on illustrated photograph in this manual.

Oscillator Tracking Condenser Alignment 1. Tune in local oscillator to 600 kilocycles.

2. Adjust both tuning control and tracking condenser simultaneously to give maximum signal as noted on output meter. This will be obtained by rocking tuning control across resonance point. while adjusting tracking condenser to give maximum output at the point of resonance. This operation cannot be performed without local oscillator and output meter.

Check

Check the alignment. previously made of R. F. and oscillator aligning condensers in the vicinity of 1,500 kilocycles.


MAJESTIC PAGE 2-21

GRIGSBY GRUNOW CO..

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GULBRANSEN PAGE 2-1

GULBRANSEN CO.

MODEL 13 Schematic

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PAGE 2-2 GULBRANSEN

MODEL 13 Chassis

GULBRANSEN CO.

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GULBRANSEN PAGE 23

YODEL 13 Voltage -Data

GULBRANSEN CO.

POWER TRANSFORMER One side of the 110 volt line is connected to the terminal marked Pn. 2" and the other side to one switch terminal on the receiver. The switch completes the circuit to the "Pri. 1" terminal.

The 25 cycle transformer is especially designed for operation on 110 volt, 25 cycle current but may also be used on any 110 volt, A.C. supply having a higher frequency.

Receivers having a 220 volt, 40 to 60 cycle power transformer may also be operated on 110 volt, 40 to 60 cycle current when connections on the primary of the transformer have been changed.

The red and green wires shown in the sketch. (220 volt) must be disconnected and then connected as shown in the 110 volt sketch. No other changes are necessary.

CONDENSERS AND RESISTORS Three blocks contain the maiority of condensers. The choke in the plate circuit of the second detector tube is also contained in one of these blocks. The common leads of condenser blocks No. 1

and No. 2 are grounded. Cl, C4. and C6 in block No. 3 have a common lead which is grounded. and the choke and C3 in this block have a common lead connected to the plate of the 2nd detector.

ANALYZER CHART All voltages taken with a 1.000 ohm per volt voltmeter on the scale indicated in the column headed "Meter Scale." Turn the volume all the way on and connect the antenna and ground leads together. The grid. plate, and screen grid voltages are measured to cathode of the '24 and '35 tubes and to filament of the '47 tube. The grid voltage on the '27 oscillator cannot be taken except with a very sensitive, low scale voltmeter. The voltage is approximately .05 volts when the A . line voltage is 110 volts.

Tube Circuit Meter Scale 110 V.

R.F. Grid 0-10 1.9 (Ant ) Screen Grid 0-100 63. '35 Plate 0-250 225.

1st Grid 0-25 14.5 Det. Screen Grid 0-100 65. '24 Plate 0-250 220.

Int. Grid 0-10 1.9 '35 Screen Grid 0-100 63.

Plate 0-250 225.

2nd Grid 0-25 14.5 Det. Screen Grid 0-100 65. '24 Plate 0-250 135.

Osc. Grid '27 Plate 0-100 80.

Aud. Grid 0-10 2.7 '47 Accelerating (See Caution Grid 0-250 225.

Above) Plate 0-250 205.

'80 Rect.

Filament to Ground 0-1000 233.

Phonograph Hook-up

SERIES 13 STiPERHET HODYNE


PAGE 24 GULBRANSEN

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PAGE 2-6 GULBRANSEN

MODEL 20 Soriee Volts;go GULBRANSEN CO. Alignment

ALIGNMENT A thorough check of the receiver should be made before any attempt is made to re -align any circuits. Examine the antenna and ground connections. Test all the tubes and check all voltages to determine if the failure of the receiver to operate properly is not due to some fault other than mis -alignment. A superheterodyne receiver must be accurátely aligned to be selective and sensitive: This receiver' has been accurately aligned at the factory and, due to the mechanical design of the gang and adjustable condensers, will not lose its alignment unless damaged by abuse or accident.

A modulated test oscillator and an output meter MUST be used when aligning this receiver to insure accurate alignment. It is important that the oscillator deliver a signal at exactly 175 K.C. in addition to frequencies in the broadcast band.

The adjustable condensers which tune the secondaries of the I. F. transformers are located under the hole in top of the shield where the grid lead to the tube is brought out. The condensers which tune the primaries of the first and third I. F. transformers are located under the small hole opposite. The capacity of each condenser is varied by rotating the small adjustment screw under the hole. A trimmer condenser is mounted over each condenser in the gang and is adjusted by turning the screw located under the hole in top of the gang shield. The shield should not be removed.

The oscillator 600 K C. tracking condenser ís located tinder the hole in the oscillator unit shield.

Make each adjustment in the order given below or the receiver may be thrown further out of alignment and it will then be a difficult task to align it properly.

The receiver and test oscillator must be well grounded and the output kept within the range of the output meter at all times. Ali shields must be in place when making the adjustments.

Tube Circuit Meter Scale 90 V. 100 V. 110 V. 120 V.

R.F Screen '35 Grid 0-100 67. 75. 82. 90.

Plate 0-250 136. 151. 166. 181. 1st Screen Det Grid 0-100 63 70. 77. 84. '35 Plate 0-2.50 132. 147. 163. 179. Oscillator '27 Plate 0-100 70 77 85. 92. 1st I.F Screen '35 Grid 0-100 67 7 5 82. 90.

Plate 0-250 136. 151. 166. 181.

Screen 2nd I.F Grid 0-100 65. 72. 79. 86. '35 Plate 0-1000 227. 252. 277. 303. 1st A.F. '27 Plate 0-100 '87. 95. 104. 115.

Grid 0-25 12.7 14. 15.4 17. 2nd A F. Accelerating '47 Grid 0-1000 192 208. 235. 252.

Plate 0-1000 180 200. 220. 240. 80 Current 0-100 89. M.A. 98. M.A. 108. M.A. 118. M.A.

Rect (Both Plates)

(See below)

Plate to Plate voltage

0-1000 547 568. 690. 712.


GULBRANSEN PAGE 2-7

GULBRANSEN CO.

Part Name No. 1'.204u8 P.1193 P-1336 P1092 1'.220365 l'-1273 l'-1011 P-1384 P-50534 V-10180 1..-10181 P-1146 P-1173 l'-20422 P-1388 l'-20286 P-1054 P-80889

l' -1383-B P-30365 l'-10182 l'-20473 P-1394 I'-1382 P-1393 P-80866

'P-1128 'P -1197-B *P1340 'P-20283

*Asterisk refers to parts used on drum dial models.

List Price

Tube Shield Base .10

Laminated Phono Jack .15

Control Knob .25

Grid Clip Assembly .10

Wire Clamp .10

Dial Light Bulb, 2.5 volts .25

S. P. D. T. Switch (Quiet -Power or Phono) .70

Resonance Meter 2.75

Power Supply Choke 1.40

Rubber Chassis Support (Large) .10

Rubber Chassis Support (Small) .10

Terminal Strip (Large) .15

Terminal Strip (Small) .10

Chassis Mounting Stud .10

Dial Escutcheon Plate (Give Model number of set) .60

Resistor Spring Mtg. Bracket .10

On -Off Toggle Switch .75

3 Gang Condenser less drive for rubber pinion drive only 6.40

Drive Bracket & Bearing Assembly .30

Bushing for rubber pinion .10

Rubber pinion .10

Drive Shaft .10

Dial Strip & Bracket Assembly .45

Drive Disc Hub & Fulcrum Assembly .25

Indicator Assembly .25

3 Gang Condenser less drive for friction drive models 6.40

Drive Bracket & Bearing Assembly .15

Friction Drive Shaft Assembly .25

Dial Strip .20

Dial Drum .40

MODEL 20 Series Parts List Socket- Data

RESISTORS Part No. J' -90954-B P -90935-A 1';90938 P -90912-A P -90912-A P -90954-B P-90980 P -90923-A P -90923-A P-90947 +._90916 P -90986-B P-90945 P -90912-A

l'.9 1000

Key No. Resistance Type List Price

R1 250,000 Carbon $ .25

R2 200 Carbon .25

R3 500,000 Carbon .25

R4 100,000 Carbon .25

R5 100,000 Carbon .25

R6 250,000 Carbón 25 R7 : 0-500,000 Volume Control 1.35

.25 R8 2 meg. Carbon

.25 R9 2 meg. Carbon 25

RIO 4,000 Carbon 20 R11 40,000 Gabon

R13 0-2 meg. Tone Control. ..95 95 R13 40.000 Carbon

R14 100,000 Carbon .25

( Rl5 I R16 JR17

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300 38

100

CONDENSERS

Vitreous Enamel Resistor 1.80

Part No. Key No.

P-80862 P-80862 P-80865 P-80865 P=80863 P-80863

80901 P-80900 P-80900

C9 C10 CI1 C12 C13 CI4 C15 C16 C17 C1 C2 C3 C4

P -80861-F - C5 (Block)) C

C8 P'80879 JC18

C19

Referring to sections C6 and C13 in the above list, it will be noted- that these have two leads each with the saute color code. This was changed ip a later model to one lead each, the other lead of each section being connected to the common black lead.

At a later date, two further changes to this condenser !block were made. Section C6 which bypassed the grid re- turn of the first I.F. tube toground was discontinued and section C4 was changed to .25 mfd. These changes bring the block up to date.

Capacity Type Voltage Rating

.05 Tubular 160 V.

.05 Tubular 160 V.

.0001Molded

.0001 Molded

.004 Tubular

.004 Tubular 8.0 Electrolytic 450 V. 8.0 Electrolytic 450 V.' 8.0 Electrolytic 450 V.

.1 160 V. White, Green Tr.

.25 300 V. Blue

.1 160V. White, Green Tr.

.1 160 V. White, Red Tr. 5 .1

Block 160 V. 160 V.

Brown White

500 V. Red 160 V. Yellow (2 Leads)

2.0 Block 160 V. J 25 cy. only 1

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PAGE 2-8 GULBRANSEN

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PAGE 2-10 GULBRANSEN

YODEL 23 Parts List Phono Data GULBRANSEN CO.

SERIES 23 SUPERHETERODYNE

PHONO PICKUP INSTALLATION The following parts must be supplied from the factory to make the installation:

1 S. P. D. T. Switch, Stock No. P-1011 I Tip Jack Assembly, Stock No. P-1193.

Removal of the license plate on the rear of the chassis will disclose a slot with small holes at each end. The tip jack assembly should be bolted, inside, through the small holes.

Drill a 31/64" hole one inch from the tip jack nearest the center of the rear of the chassis and place the barrel of the switch through the hole with the body of the switch in a horizontal position.

The terminal strip mounted in the left front corner of the base has the resistor. R7. (Red body, green end, yellow dot) , connected to the first and second terminals on the end of the strip nearest the center of the chassis. One end of the .05 mfd. condenser, C10, is also connected to the second terminal. See Fig. 4.

Disconnect the resistor, R7. at the second terminal of the strip. Splice a piece of wire to the disconnected end of the resistor and connect the other end of the wire to two terminals, one on each end and on the same side of the switch.

Connect another wire to the terminal where the resistor was to one of the two open terminals on the switch.

The remaining open terminal on the switch is then connected chassis base.

Ground the opposite tip jack on the grounded terminal of the candohm resistor.

Make all wires and connections short, firm, and well insulated.

When the switch is thrown so that the circuit from "A" to "B." is open and "B" to "C" is closed, the pickup is, then properly connected for phonograph reproduction. thrown in the opposite direction for the reception of broadcast signals.

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GULBRANSEN PAGE 2-11

GULBRANSEN CO.

SERIES 23 SUPERHETERODYNE

MODEL 23 Voltage Phono Data

POWER TRANSFORMER Fig. 4 shows the 110 volt power transformer connections. One side of the 110 volt A. C. line is con-

nected to the terminal marked "Pri. 1" and the other side to the open terminal, on the opposite side of

the winding, which is in turn connected to one terminal of the switch on the receiver. The switch com-

pletes the circuit to the "Pri. 2" terminal.

The 25 cycle transformer is especially designed to operate on 110 volt, 25 cycle current, but may also

be operated on any 110 v. A. C. supply having a higher frequency, after the condensers C17 and C23

have been disconnected.

Receivers having a 220 volt, 40 to 60 cycle power transformer may also be operated on 110 volt, 40 to 60

cycle current when connections on the primary of the

transformer have been changed.

The red and green wires shown in the 220 volt sketch,

must be disconnected and then connected as shown in

the 110 volt sketch. No other changes are necessary.

Tube Circuit Meter Scale 110 V.

R.F. Screen '35 Grid 0-100 82.

Plate 0-250 166.

1st Screen Dec. Grid 0-100 77. '35 Plate 0--250 163.

Oscillator '27 Plate 0-100 85.

1st I.F. Screen '35 Grid 0-100 82.

Plate 0-250 166.

Screen 2nd I.F. Grid 0-100 79. '35 Plate 0-1000 277.

1st A.F. '27 Plate 0-100 104.

Grid 0-25 15.4 2nd A.F. Accelerating '47 Grid 0-1000 235.

Plate 0-1000 220.

'80 Current 0-100 108. M.A. Rect. (Both

Plates) (See below)

Plate to Plate voltage

0-1000 690.

252-T Phonograph Hook-up

The '80 rectifier plate voltages shown are the totals of both plates, measured from each plate to center tap of high voltage secondary

All voltages taken with a 1,000 ohm per volt voltmeter on the scale in the column headed "Meter Scale." Turn the volume all the way on. connect the antenna and ground leads together and turn the gang condenser plates all the way out. CHECK THE LINE VOLTAGE.

The measurement of grid bias voltages (except on the 47 pentodes) is not recommended, as this causes

an abnormal rise in plate current which is injurious to the tube. Further, the measurement of actual grid bias voltages is impossible due to the .high resistance in the grid circuits. When the receiver does not function properly and the trouble is apparently due to improper grid bias on any tube or tubes, the cause of the

trouble inn be determined by applying the proper continuity tests. CAU'T'ION: 1N ORDER THAT THE EFFICIENCY OF EACH TUBE MAY BE COMPARED

WITH THAT OF OTHER TUBES OF THE SAME TYPE. THEY MUST NOT BE TESTED IN THE SOCKET IN WHICH THEY' ARE USED. TEST ALL '35 TUBES IN THE SECOND I. F.

SOCKET AND TEST THE '27 TUBES IN THE FIRST A. F. SOCKET. TAKE THE VOLTAGE READINGS AT THE SOCKET IN WHICH THE TURF. IS USED.



MODEL 23 Data

SERIES 23 SS ERHETEROD fl F,

REVISED MODEL A green p aint mark on

the left rear -corner of a chassis indicates the

following changes: (1) Contination tone con-.

trol and "On -Off" switch replaced by twa separate units. The tone ,control is mouñted and connected as previously but ron -Off switch is on side of cabinet.

GULBRANSEN CO.

STAT/ON SELECTOR Ow>OF //c/r ` PLUME nmirpez

s ivv -7 (2) Intermediate trenfor-.rNrrmm-- mers assembled together with their adjustable tun ing condensers in a round shield.Condensers are adjusted by inserting screw- driver trough the holes provided underneath base, _ Ru

directly below transformer assembly.Early models are adjusted through hole in top of (rectangular) shield/

Z47 --J 7U Z/C 1 Sr err \ %S'PEAA'ER CABLE

TOP VIEW OF EARLY MODEL RECEIVER

P- 9094S 40,00o n CARBOM

REVISED -- OSCILLATOR CIRCUIT

(3) The oscillator coil, its shield, and the 600 K.C. tracking condensor are all mounted separately on the base. The tracking eondensor adjustment screw will be found near the left rear corner of the oscillator coil shield. The .0005 mfd. condensor (014) is not used and the 30,000 ohm resistor (R12) is replaced by a 40,000 ohm resistor mounted between a coil lug and the tracking condensor. The revised oscilldtor circuit is shown herewith:

The parts affected by the ohange, are listed below with corresponding parts numbers:

i

OLD NUMBER

Tone Control & "On-Off'P Switch 1st L.F. Transformer Assembly 2nd I.F. Transformer Assembly 3rd I.F. Transformer Assembly Oscillator Unit Assembly

P-90977

P-1367

P-1364

P-1365

P-1366

NEW NUMBER

"On -Off" Switch P-1054 Tone Control P 90986-A 1st I.F. Assembly 2nd I.F. Assembly 3rd I.F. Assembly Oscillator Coil Coil Shield 600 K.C. Tracking 40,000 Ohm Carbon

P 1424 -2-1425

P 1426 P 1400 P 40412

Cor.den.--P-1385-A kesistor-P-90948


GULBRANSEN PAGE 2-13

GULBRANSEN CO. ALIGNMENT

A thorough check of the receiver should be made before any attempt is made to re -align any circuits.

Examine the antenna and grcund connections. Test all the tubes and check all voltages to determine

if the failure of the receiver to operate properly is not due to some fault other than mis -alignment.

A superheterodyne receiver must be accurately aligned to be selective and sensitive. This receiver has

been accurately aligned at the factory and, due to the mechanical design of the gang and adjustable

condensers, will not lose its alignment unless damaged by abuse or accident.

A modulated test oscillator and an output meter MUST be used when aligning this receiver to insure

accurate alignment. It is important that the oscillator deliver a signal at exactly 175 K.C. in addition

to frequencies in the broaac.ct band. The adjustable condensers which tune the secondaries of the intermediate transformers are located under

the hole in top of the shield where the grid lead to the tube is brought - out. The condensers which

tune the primaries are located under the small hole opposite. The capacity of each condenser is varied

by rotating the small adjustment screw under the hole.

Make each adjustment in the order given below or the receiver may be thrown further out of align-

ment and it will then be a difficult task to align it properly.

The receiver and test oscillator must be well grounded and the output kept within the range of the

output meter at all times.

All shields must be in place when making the adjustments.

MODEL 13 MODEL 25 Alignment

INTERMEDIATE CIRCUITS Tune the test oscillator to exactly 175 K.C. and connect its output to the grid of the first detector

rube after removing the clip on the lead from the gang condenser.

Adjust the primary and secondary of the first intermediate transformer for greatest volume.

Follow the same procedure on the second intermediate transformer and then turn the receiver off.

Disconnect one end of the speaker voice coil and connect the output meter across the secondary of

the speaker coupling transformer. Short the oscillator tuning condenser (in the gang) by grounding

the stator plates with a screw driver.

Turn the receiver on and adjust the output until the output meter shows a small or medium scale

deflection.

Adjust the primary of the first intermediate transformer for the greatest deflection on the output meter.

Adjust the secondary in the same manner.

FolloW the same procedure on the second intermediate transformer and then check the settings of all

condensers to make certain the maximum output has been obtained.

When the above instructions have been followed, remove the test oscillator coupling and replace the

grid lead on the first detector, and also remove the screw driver shorting the oscillator tuning condenser.

GANG CONDENSERS Couple the test oscillator output to the antenna, (white wire), on the receiver.

Tune the oscillator tó 1400 K.C. and carefully tune the receiver to the signal.

A trimmer condenser is mounted over each condenser in the gang and is adjusted by turning the screw

located under the hole in top of the gang shield. The shield should not be removed. Adjust each

trimmer condenser for maximum deflection on the output meter.

( OSCILLATOR Tune the test oscillator to 600 K.C. and tune the receiver to the signal. Then after turning the re-

ceiver off, disconnect the output meter and replace the voice coil lead which was disconnected.

Turn the receiver on and rotate the adjusting screw on the 600 K.C. tracking condenser under the

hole in top of the oscillator transformer shield. Rock the gang condenser back and forth across the

signal at the same time and listen closely until the maximum volume is obtained. The tricking con-

denser is then properly adjusted and remains fixed thereafter.

The receiver should be accurately aligned jf the above instructions have been followed and no further.

adjustments need be made.



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Will vary with dial setting.


HAMMARLUND PAGE 2-1

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HOODWIN PAGE 2-1

CHARLES HOODWIN CO. MODEL Aero Auto Radio MODEL Aero 1932 Converter

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PAGE 2-2 HORN

MODEL Tiffany Tone 101, 110 Alignment Data HERBERT H. HORN

VOLTAGE TABLE No Signal Input To Receiver

No. Type Function Plate Soreen Cathode Heater

1 335 RF Amp 187 80 2.8* 2.1

2 335 Trans 187 80 2.8* 2.1

3 327 Osc. 80 - 4.2* 2.1

4 335 IF Amp 187 80 2.8* 2.1

5 327 'Det. - - - 2.1

6 327 1st AF 30* - 4.9* 2.1

7 227 2nd AF 115 - 7.2* 2.1 8 347 Output 210 205 13.1* 2.3

9 347 Output 210 205 13.1* 2.3

10 280 Rect. 4.8

* Voltmeter resistance 50,000 ohms. All other voltages measured with 250,000 ohm voltmeter. Chassis is negative

for all readings.

IF TRA,*1SFORAIER ADJUSTMENT

There are four i -f transformers. Both the grid and plate circuits of each must be tuned sharply to 175 kc. The condenser adjusting screws are accessible from the underside of the chassis; there being two slotted screws protruding through the insulated base of each transformer.

LINE UP OF GANG CONDENSERS

The four sections of the gang condenser function as follows: The first section,

looking at the rear df the chassis tunes the selector stage. The second section

tunes the grid circuit of the r -f amplifier. The third section tunes the grid

circuit of the translator tube and the fourth section tunes the oscillator. The fourth section is that nearest the front of the chassis. The first three must

track together at signal frequency, which is the desired signal frequency. The

oscillator section on the other hand must track 175 kc higher than the signal

f rei uency. THE SHORT VNAVE TUNER

The short wave tuner consists fundamentally of two tuned circuits and two tubes,

one of which is a 224 operating at short wave signal frequency as a first

detector ans the other tube is a 227 oscillator tuned to 550 kc higher than the

desired short wave signal frequency. The resultant beat of 550 Ito is fed into

the antenna post of the broadcast part of the complete receiver chassis, which

operates as an 550 kc intermediate frequency amplifier during short wave recept-

ion. The dial of the broadcast receiver múst be set to 550 'cc during short wave

reception.

To balance: Set band selector switch on nos`tinn C - set dials on about 10. The

front section of the two gang condenser tunes the detector stage to signal

frequency; the back section tunes the oscillator coils to a frequency 550 kc

greater than signal frequency. If the small variable condenser, which is

paralleled with the detector condenser, will not resonate its circuit within

its capacity range, it will be necessary to change the trimmer located on the

oscillator section of the main tuning condenser. This may be done by tuning

in a signal and rotating the variable trimer to maximum resonance; if this

point is reached with the balancing condenser plates at maximum capacity, it

will be necessary to reduce the oscillator trimmer capacity, and if the reson-

ance point is approached with the balancing condenser at minimum capacity, it

will be necessary to add capacity to the oscillator trimmer. This should be

regulated so the balancing condenser peaks with the plates about half way out,

with the short wave tuning dial set at 50.

The approximate stetting of the oscillator trimmer may be obtained by turning

the adjusting.screw down tight and then relasing it two full turns.


HOWARD PAGE 2-1

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PAGE 2-4 HOWARD

MODEL 36,40 (H)

Alignment Data. HOWARD RADIO CO.

MODEL "H" ADJUSTMENTS The 175 kc. oscillator must be accurately tuned to 175 kc. and only 175 kc. If this precaution is not observed it will be impossible to align the oscillator to the rest of the set and the set will not operate correctly as the oscillator is designed for exact 175 kc. operation.

The second intermediate frequency amplifier transformer shield can is removed and one side of the small variator condenser is discpnnected from the primary coil. This coil is connected so that it still is in the plate circuit of the tube but the tuning condenser is not connected in the circuit. Now remove the grid cap from the intermediate amplifier tube and connect a 3 megohm resistor from the control grid to ground. Now connect the output from the 175 kc. oscillator to the grid of the intermediate frequency amplifier tube and tune the secondary for maximum deflection of the output meter. (Low voltage alternating current meter, 0 to 3 volts, connected across the voice coil of speaker). Now remove the shield can and connect the small tuning condenser that was previously removed back across the primary coil. With the 175 kc. oscillator connected the same as before, tune the primary for a maximum deflection of the output meter. (Caution: Do not under any circumstances try to retune the secondary after having tuned the primary. This is important.) After having tuned this stage proceed to the next intermediate frequency:

(b) Replace the, gild cap on the intermediate frequency amplifier and proceed to the first detector tube. Remove this tube cap and connect the 175 kc. oscillator as before, being sure to connect the 3 megohm resistor from control grid to ground. Now proceed to tune the intermediate frequency transformer by tuning the secondary first for maximum deflecticn of the output meter and then tuning the primary for maximum deflection. Tuning this :ans - former must be done very carefully as the selectivity of the whole receiver depends entirely on the tuning of this transformer.

(c) To line up the radio frequency amplifier and detector stages, remove the oscillator tube and the second detector tube. Unsolder the connection on the plate terminal of first detector tube socket and solder a wire from this terminal to the plate terminal of the second detector tube socket. Now set the Test Oscillator (R. F. Generator) which tunes over the broadcast frequency range to 1400 kcs. Connect the output of this oscillator to the aerial and ground wires of the receiver. Now make sure that when the tuning condensers are all in maximum capacity that the pointer on the escutcheon lines up with the line just be- yond the 550 kc. dial mark and then turn the dial until the escutcheon pointer lines up with the 1400 kc. line on the dial. The tuning condenser trimmers should now be adjusted until a maximum deflection is shown by the output meter. Now set the oscillator to 1000 kcs. Turn the dial to 1000 kcs. and then secure maximum deflection on the output meter by mov- ing the serated plates of the variable condenser in or out as the case may be. Repeat the same procedure at 600 kcs. as was used at 1000 kcs. (Do not touch the trimmer condensers after having once set them at 1400 kcs.). Unsolder the wire connecting the first detector plate terminal to the second detector plate terminal. Resolder the wire that was originally unsoldered from the first detector plate terminal. Now replace the oscillator and second detector tubes.

(d) To line up the oscillator tune the set to 1400 kcs. and adjust the oscillator tuning condenser trimmer (the last hole of the three holes in a line on the top of the tuning condenser housing) as viewed from the front of the set, (see Fig. 1) until a maximum reading is secured on the output meter. Adjust the Test Oscillator to 600 kcs. and tune the receiver to 600 kcs. Now adjust the oscillator series condenser trimmer (the hex. nut in the hole to the left of the oscillator tuning condenser trimmer hole) until a maximum deflection is secured on the output meter. Now reset the Test Oscillator to 1400 kcs. and retune the set to 1400 kcs. and make adjustments if any are necessary on the oscillator tuning condenser trimmer. It is very seldon necessary to make any readjustments at 1400 kcs. after they have once beer made.

Now tune the Test Oscillator to 1000 kcs. and tune the set to 1000 kcs. Try adjusting the antenna trimmer condenser to determine whether the oscillator aligns at this frequency. If the antenna trimmer must increase capacity to give maximum deflection of output -meter the oscillator tuning condenser serated plates should be moved out. If the antenna trimmer condenser is decreased in capacity the oscillator tuning condenser serated plates should be

bent in towards the stator plates. The Test Oscillator must again be set to 1400 kcs. and the set retuned to 1400 kcs. to

make sure that the antenna trimmer condenser has been correctly reset after the oscillator ad-

justment has been made at 1 000 kcs. in making tests atter having made adjustments according to the foregoing paragraphs,

it is necessary to replace the tube and coil can shields before making the tests.


HOWARD PAGE 2-5

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PAGE 2.6 HOWARD

MODEL 45,60

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