Philco 37-630 User manual

·...._.,-
• • • • • • • • • • • ?rk,dJll 37-630
FOR MEMBERS OF
RADIOMANUFACTURERSSERVICE SERVICEBULLETIN
No. !51
General Description
Model 37-630 is a 6 tube superheterodyne receiver for operation
on alternating current, having three tuning ranges , covering
stand ard broadcast and short-wave frequencies , and using the new
Philco High-Efficiency self-centering glass tubes .
The circuit' includes the Philco "Foreign Tuning System"
controlled by the tuning range switch which provides maximum
sensitivity and noise redu ction, when used with the Philco High
Efficiency Aerial supplied with the receiver. One stage .of Radio
Frequency amplification which greatly increases the signal to
noise ratio, automatic bass compensation in the volume control
circuit, shadow tuning and a separate diode circuit for automatic
volume control are also incorporated in this receiver.
The red and black leads of the High-Efficiency Aerial "trans-
mission line" are connected to termin als 1 and 2 respectively , of
the terminal panel provided at the rear of the chassis. Connect
the jumper on the terminal panel across terminals 3 and 4.
If a temporary aerial is used, the jumper should be across ter -
minals 2 and 3. The aerial connects to terminal 1and the ground
to terminal 3.
A good ground connection is desirable in all installations. Make
the ground connection from the nearest water or radiator pipe to
termin al 3 on the terminal pariel.
The chassis is constructed in three basic assembly units, concen-
trating each circuit in a single unit .
The Radio Frequency unit, located in the center of the chassis,
contains a 6K7G tube which functions as a Radio Frequency
Amplifier ; a 6A8G tube, for the Detector-Oscillator circuit,; indi-
vidual Antenna, R. F. Amplifier and Oscillator coils for each
tuning range; selector switch ; compensating condensers for all
coils; and other parts necessary for the associated circuits . The
unit is separately mounted on rubber grommets, cushioning it
from the main chassis.
The Intermediate Frequen cy unit , mounted on the right hand
side of the chassis (facing front of set) consists of the Intermediate
Frequenc y transformers , compensating condensers, a 6K7G for
the I. F. Amplifier stage, and a 6Q7G tube as the second detector
.-automatic volume control and first audio stage. All voltages
supplied to the I. F. and R . F . units are furnished from a termin al
strip mounted in this unit.
The Power Pack and Audio Output circuits, together with the
required voltage dividers and filter condenser§ are mo-·;;ted in the
power unit . This unit contains a 6F6G tube and a 5Y4G tube for
the Power Output and Rectifier Circuits respectively , and the
combined tone control and power switch.
Schematic Diagram , Fig . 5, is numb ered , indicating all impor-
tant parts. These numbers correspond with the parts layout shown
in Fig . 6. In addition , the range switch wafers are shown on the
schematic diagram . The cont acts on each wafer are numbered
and lettered to indicate their conne ction points in the schematic
diagram , which are also lettered and numbered . The physi cal
drawings of each. coil used in the receiver are also shown on
schematic diagram Fig . 5. The connections of these coils are
numbered on the coil drawing and on the schematic diagram .
Fig . 1 shows the Voltage measurements taken from the bottom
of the socket at each contact. In Fig . 2, the correct position of
the dial indicator , for proper adjustment of the compensator con-
denser is shown. Fig. 3 and 4 are the locations of the I. F . and
R. F. compensators respectively .
This receiver is used in cabinets type X code 121 and type T
code 122. These instructions, however, will cover both types .
Electrical Specifications
Voltage Rating: ll5 Volts A.C.
Frequency Rating: 50 to 60 cycles. Detector, Automatic Volume Control and 1st Audio; 1 type
6F6G , Output; and 1 type 5Y4G Rectifier.
For 25 to 40 cycle operation the Power Transformer marked
with asterisk in parts list is used. Undistorted Output: 3 watts .
Intermediate Frequency: 470 K. C.
Tuning Ranges: Three . Range 1.-530 to 1720 Kilocycles; Range
2.-2.3 to 7.4 Megacycles; Range 3.- 7.35 to 22 Megacycles.
Power Consumption: 65 Watts.
Types and Number of Tubes: 2 type 6K7G, R. F. and I. F . Speakers: X Cabinet - H24
. T Cabinet - K38
Amplifiers; 1type 6A8G, Dete ctor-Oscillator; 1type 6Q7G, 2nd
340<~
® J ••
~SOCMHM0U NTl0
OH TOP or POW[R HU,NS . '¥"
1··-········-··--·--------1
.,-;,:,~ G .;_:p\
(<~S::i~)
' .
...-----..-······----. ------~
70V. 250V.
z.,11-0(T.·ln.AUDJO
E,Q7G
Fi~. 1. Socket Voltages
Measured from Socket Contact to Ground
Underside of Chassis View
The " olt ages indicated by arrows were meas ured with a
Philco 025 Circuit Tester which cont ains a voltmeter hav-
ing a resistan ce of 1000 ohms per volt . Volume Con trol at
minimum. Range Switch in broa dcast position. Line
voltage 115 A.C.
POWER TRANSFORMER DATA
Lead No .
Shown A.C. Current
on Sche- Volts
matlc
---- ---
1.,-2 120 -
---- --- - - --
3- 4 5.0 2.0 A.
---- ----
5- 7 670 70 Ma .
-- --
6 - -
---- - -- - ----
8- 9 6. 7 2.1 A.
Run 2.
Circuit Color
Pri. Whit e
--- - ----
Fil. Rlue
Rectifier ----
High
Voltage Yellow
Sec.
Center
Tap of -
5- 7
-- --
Fil. Black
Resist-
ance
-----
5 ohn,s
-----
.1 ohm
145 ohm s
155 ohms
---- -
-
.1 ohm Speaker Wiring
When replacing any part of th e
spea ker, th e hum bucking coil
conn ect ions should be connected
for minimum hum.
WhiJe the circuit arr angement remains th e same, th e loca tions of th e parts are slightly cha nged
in thi s Run. Bak elit e condens er
~ Part No. 3793-DG is removed from front and placed in th e
rear of th e chass is. Tubular condenser O Par t No. 30-4380 is repla ced with a Part No. 8318-SU
bakelite condenser pla ced in th e p0sition formerly held by 3793-DG.
Copyright 1936, Philc o Radio & Televisi on Corporation
philcoradio.com

PageZ PHILCO Service Bulletin No. ZSI
~
t
6Q'T6
2-DET .-I IT-AU0I0
Flit. 2-Dlal Calibration Flit. 3-Locatlons of I. F. Compensator• Fig. 4-Locatfons of R. F. Compenaators
Alignment of the Compensators
The accurate adjustment of the various compensating con-
densers is vital to the proper functioning of this receiver . There
are four compensati 1gcondensers in the I. F. Circuit, four in the
Oscillatcr Circuit, three in the R. F. Amplifier Circuit and three
in the Antenna Lircuit . Incorrect adjustment will cause loss of
sensitivity, unsatisfactory tone, and poor selectivity.
To accurately adjust this receiver, precision test equipment is
necessary. A signal generator such as the PHILCO MODEL 088
SIGNAL GENERATOR, covering from 110 to 20,000 K. C. is
recommended for adjusting the compensators at the various fre-
quencies specified. A visual indication of the receiver output is
also necessary to obtain correct adjustment of the compensators.
PHILCO MODEL 025 CIRCUIT TESTER contains a sensitive
output meter and is recommended for these adjustments.
Philco Fibre Handle Screw-driver No. 27-7059 completes the
necessary equipment for these adjustments. The locations of the
various compensators are shown in Figs . 3 and 4.
· The following procedure must be observed in adjusting the
compensators:-
Dial Calibration - In order to adjust this receiver correctly,
the dial must be aligned to track properly with the tuning con-
denser . To do this, rotate the tuning condenser control to the
extreme counter-clockwise position (maximum capacity). Loosen
the screw of dial hub , then turn dial until the glowing indicator
is centered on the first index line of dial scale (see Fig. 2). Now
tighten the dial hub set screw in this position.
Shadow Meter Adjustment - Remove aerial and allow tubes
to warm up. Then adjust shadow meter as follows:
1 Move the Shadow meter coil backwards and forwards, until the
shadow is within one-eighth of an inch of each side of the screen,
2 Remove the Rectifier tube from its socket, and rotate the
shadow meter coil for minimum shadow width.
3 Repl ace the Rectifier tube. The shadow should then return to
maximum width or within one-eighth of an inch of each side
of the screen. If the shadow does not return to maximum width,
operations 1 and 2 should be continued until it does.
Output Meter - The 025 Output Meter is connected to the
plate and cathode termina ls of the (6F6G) tube . Adjust the
meter to use the (0-30) Volt Scale .
During the I. F. and R. F. adjustments, the signal generator •
output should be maintained at the lowest possible level that will
give an indication on the output meter.
INTERMEDIATE FREQUENCY CIRCUIT
Frequency 470 K. C.
1 Connect the 088 Signal Generator output lead, through a .1
mfd. condenser, to the control grid of the 6A8G tube; and the
ground connection of th e output lead to the chassis.
2 Set the ran ge switch in positio n No. 1 (Broad cast), then rotate
the tuning condenser of the receiv.er to the maximum capaci tv
position (counter-clockwise), and adjust the signal generator
for 470 K. C.
3 Adjust compensators @a 2nd I. F. Sec., ® 2nd I. F . Pri ., @a
1st I. F. Sec., and @ 1st I. F. Pri. for maximum readin g on
output meter.
RADIO FREQUENCY CIRCUIT
Tuning Range - 7.3 to 22:0 M. C.
1 Remov e the signal generator output lead from the grid of 6A8G
tube, and connect it through a .1 mfd. condenser to terminal
No. 1 on aerial input panel, and the generator ground lead to
termin al No. 3, rear of chassis.
(a) Terminals 2 and 3 of aerial input panel must be connected
with connector link provided on the panel , during these adjust -
ments .
2 Set the tuning range switch in position No: 3 (Short Wave).
Turn the signal generator and receiver dials to 18 M. C. and
adjust compensators @b Osc., @b R. F. and (Db Ant. for
maximum output. (See Note (a) below) .
(a) The adjustment of the Radio Frequency compensator on
the high frequency range causes a slight detuning of the oscil-
lator circuit. In order to overcome this detuning effect, connect
a variable condenser of approximately 350 mmfd., havinp- a
good vernier drive, across the oscillator section of the tuning
condenser. Leaving the signal generator and receiver dials at
18 M. C., tune the added condenser so that the second har-
monic of the receiver oscillator will beat against the signal from
the 088 signal generator bringing in the signal. The antenna and
R. F. compensators(Db and@b should then be adjusted to give
maximum output. Now remove the external condenser and
turn compensator @b to maximum capacity (clockwise) then
without moving signal generator or receiver tuning condenser,
back off compensator @b (counter -clockwise) until a second
peak is reached on the output meter. The first peak is caused
by tuning to the image frequency signal and must not be used .
Tuning Range 2.3 to 7.4 M. C.
1 Turn the range switch to position No. 2 (police). Rotate the
signal generator and receiver dials to 7.0 M. C. Then adjust
compensator @a for maximum output. Now turn the signal
generator and receiver dials to 6.0 M. C. and adjust compensa -
tors @a R . F. and (Da Ant . for maximum reading on the output
meter .
Tuning Range 530 to 1720 K. C.
1 Set the range switch in position No. 1 (Broadcast). Set the 088
Signal Generator indicator at 800 K. C. and the receiver dial
at 1600 K. C.
(a) In adjusting the receiver at 1600 K. C. the second harmonic
of 800 K. C., to which the signal generator is tuned, is used .
The second harmonic of 800 K C. is 1600 K. C. Now adj ust
compen sators@Osc ., ® R. F. and ©A nt . for maximum read-
ing on output meter.
2 The low frequency end of the range is now tuned by turning the
signal generator and receiver dials to 600 K. C. and adjusting
compens ator ® Osc. Series - (see Note (a) below) - for maxi-
mum read ing on output meter.
(a) Whil e compens ator ® is being adjusted, the tuning con-
denser must be rolled for maximum output. This is accom-
plished as follows: - First tune compensator ® for maximum
output. Then vary the tuning condenser for maximum output
at 600 K. C. Now retune compensator®• and again vary the
tuning condenser back and forth at 600 K. C. for maximum
output. This operation of first turning the compensator then
the tuning condenser is continued until maximum outp ut is
obtained at the 600 K. C. frequency .
3 After the low frequen cy (600 K. C.) end of the ranl\"eis adjusted,
the 1600 K. C. end is readjusted, as given in Paragraph (1)
above, to correct any variation that the low frequency series
compensator may have caused in ·the alignment of the high
frequency end.
4 Now turn the signal generator and receiver dials to 1500 K. C.
and readjust compensators © Ant ., and® R. F ., for maximum
output.
philcoradio.com

Page 3
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-~ @0p.s;i:.Tl:"~- @f;.~!v~t~·
DIR£C.TION OF
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OF' SWITCH. AJ AZ 82 C3 C2 [3
Fig. 5--Schematic Diagram
Model 37-630
No. ZSI
F3 F2
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philcoradio.com

Page4 PHILCO Parts and Service Division No. 251
...
PHILCO
MODEL 088
SIGNAL
GENERATOR
•
The Instrument Designed
and Specified by Philco
Engineers for Adjusting
Philco Radios
Parts List-Model 37-630
Schematic Part
No . Description No.
1 Antenna Transformer (BroadcaBt). .. .. . . . . . . . . . . 32-2108
2 AntennaTransformer (Police). . . . 32-2119
3 Antenna Transformer (S. W.).. .. . . • . . . .. . . . 32-2109
4 Compensator Ant. 1500 K. C.. . . . •. . . . . •• . . 31-6092
a Condenser (.05 mfd. Tubular). 30-4020
8 Resistor (51000ohms ½watt). 33-351339
7 Tuning Condenser................ 31-1818
8 Compensator (R. F. 1500 K.C.).. 31-6092
9 R. F. Transformer (Broadcast). .. .. . . . . .. .. .. . . 32-2105
10 R. F. Transformer (Police).... . 32-2106
11 Condenser (1.0 mmfd.)....... . ...... . ...... .. .. ..
12 Condenser (14mmfd. Mica). .. .. .. .. .. •. 30-1073
13 R. F. Transformer (S. W.).... 32-2126
14 Condenser (.05 mfd. Tubular ) 30-4123
15 Condenser (.05 mfd. Tubular ).. 30-4020
18 Resistor (51000 ohms 1 watt). 33-351439
17 Resistor (20000 ohms 1 watt) . . .... 33-320439
18 Electrolytic Condenser (16 mfd.). 30-2118
18 Resistor (10000ohms½ watt) .. .. . . .. .. .. . . 33-310339
20 Condenser (.1 mfd. Tubular).. .. 30-4170
21 Compensato r (Osc. 600K.C.J .... . . 31-6056
22 Osc. Transform er (Broadcast). 32-2120
23 Compensato r (Osc. 1600 K.C .). .. .. .. •. . . . . . . 31-6092
24 Osc. Transformer (Police)....... .. .. 32-2121
25 Condenser (1650 mmfd. Semi-fixed). 31-6096
28 Osc. Transformer (S.W.)...... .. .• .. .. .. . • .. 32-2110
27 Condenser (250 mmfd. Mica) ........ . 30-1032
28 Condenser (3500 mmfrl. Semi-fixed). . . 31-6097
29 Resistor (70000 ohms ½ watt) ... . 33-370339
30 Resistor (32000 ohms ½ watt)...... . . . . . • . . . . . . . • . 33-332339
31 Compensator (1st I. F. Pri. 470 K.C.) Part of 39
32 1st I. F. Transform er.... ..... 32-2100
33 Shadowmeter.. ... . . ... . . . . ...... . 45-2189
34 Resistor (400 ohm Bakelite). ... . . . . . . . . . . . . . . . . 33-1211
35 Condenser (.05 mfd. Tubular) . 30-4020
38 2nd I. F. Transformer ... .. .. .. .. .. .. . 32-2102
37 Compensato r (2nd I. F. Pri. 470 K.C.). . . .. . . . . •. .•. . . . Part of 42
38 Condenser (110 mmfd. Mica)......... . 30-1031
38 Resistor (51000ohms ½ watt ). .... 33-351339
40 Condenser (.01 mfd. Tubular). . 30-4124
41 Resistor (490000 ohms½ watt) 33-449339
42 Condenser (110 mmfd . Mica) . 30-1031
43 Condenser (110 mmfd. Mica) 30-1031
44 Resistor (1 megohm ½ watt ). 33-510339
45 Condenser (.015 mfd. Tubular) . 30-4358
46 Resistor (51000ohms, ½ watt) 33-351339
47 Condenser (.006 mfd. Tubular ) . .. 30-4112
48 Condenser (.015 mfd. Tubular) ... .. .. .. .. . . . . . . 30-4226
49 Volume Control..................... .......... 33-5158
50 Resistor (I meghom ½ watt).. .... 33-510339
51 Voice Coil and Cone, H24 Speaker 02625
Voice Coil and Cone, K38 Speaker. .. .. . . •. . . . . .. 36-3174
52 Output Transformer, H24 . . . . 2580
Output Transformer, K38 . . . . 2580
53 Resistor (I megohm ½ watt) .. 33-510339
04 Condenser (0.1 rnfd. Tubular) .. . . . . .• . . . . . . •. . . . . . . 30-4122
55 Resistor (490000 ohms½ watt) 33-449339
56 Condenser (.008 mfd. Tubular) 30-4112
57 Condenser (.03 mfd. Tubular ) . . .. . . •. .• .. . . •. 30-4380
58 Resistor (I megohm ½ watt ).... . .. •. .• . . . . . . . . . 33-510339
f8 Tone Contr ol and A. C. Switch. . • .. .. • .. • . 42-1182
80 Electrolytic Condenser (8 mfd.) 30-2024
81 Bias Resistor .. .... . . . . . . . . . . . . . . .. .. .. .. .. •. .• 33-3277
82 Electrolytic Condenser (12 mfd.). ..... .. . ... . . ... 30-2117
83 Field Coil Assembly, H24 Speaker.. 36-3665
Field Coil ABBembly,K38 Speaker .. 36-3718-01
84 Resistor (9000 ohms, 2 watt )..... . . .. .. . . .. .. .. .. 33-290.539
80 Power Transform er (l 15 Volt 50-60 cycle) Code 121 32-7583
Power Transformer (115 Volt 25-40 cycle) Code 121 . 32-7584
Power Transform er (115 Volt 50-60 cycle) Code 122. 32-7626
Power Transformer (115 Volt 50-60 cycle) Code 122. 32-7627
FiguresIn blacktypeIndicatecircledflguresIn BaseView.
May,1936
List
Price
so.so
.65
.75
.60
.20
.20
4.50
.60
.75
.65
.20
.55
.20
.20
.20
.20
1.65
.20
.25
.55
.65
.60
.40
.40
.75
.25
.50
.20
.20
1.50
2.50
.20
.20
1.50
.20
.20
.25
.20
.20
.20
.20
.20
.20
.20
.20
1.00
.20
1.20
.80
1.00
1.00
.20
.20
.20
.20
.20
.20
.75
1.10
.20
1.20
.30
4.50
6.50
4.25
Fig. 6-Base View
Schematic Part
No. Description No.
68 Pilot Lamp . . . . . . . . . . . .. .. . . . . . . . . . . .. .. 34-2039
87 Condenser (.015-.015 mfd. Double Bakelite) 3793 DG
68 Wave Switcn Antenna. .. .. .. .. .. .. .. .. •. 42-1170
69 Wave Switch R. F.... 42-1171
70 Wave Switch Osc...................... 42-1172
Wave Switch Indexing Plate & Shaft ... 42-1173
Pilot Lamp Assembly......... ....... . 38-7706
Dial .. .. .. .. .. .. .. 27-5203
Dial Hub.......... .. .. .. .. .. .. .. 28-7187
8::l ~
1
~b~~i -~r~;.:··. ....::::::::::::::::........ W:~:I
Dial Gear.. 28-7185
Dial Guard. . ....... . .. ....... . ...... 27-8324
Thrus t Spring .. . . . . .. .. . . .. .. .. .. . . .. 28-8611
Jhr,ust Washer .. .. .. .. .. .. .. . . .. .. .. .. .. .. . .. . . . .. 28-3976
C Washer...... 28-3904
Drive Gear.. .. 31-1884
Vernier Drive ...... ............ 31-1871
Mask ......... ...... .. .. .. .. .. .. .. 27-5198
Mask Arm Assembly..... .. .. .. .. .. .. .. .. .. .. 31-1866
Mask Guide on Lamp Bracket Support .. . .. .. .. . . •. .• .. 28-7844
MaakWasher.. .. .. .. .. .. .. .. .. . . . . .. .. . . . 27-8318
Dial Screen Assem .. . . . .. .. .. .. .. .. .. .. .. .. .. .. .. .. . 38-7912
Spring .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 28-8624
Lens.. . . .. . .. .. .. .. .. .. .. .. .. 27-8310
Volume Control Shaft . .. .. .. .. .. .. .. .. .. .. .. . . . . 28-6499
Volume Control Shaft Spring. .. .. .. .. .. .. .. .. 28-4117
Retaining Clips.. .. . .. .. .. .. .. .. .. . . .. 28-8610
Washer...... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. . 28-4186
Socket 8 prong.. . . . . .. .. .. .. .. . . .. .. .. .. .. . . .. .. .. .. 27-6058
Socket 7 prong .. . . .. 27-6057
Tube Snield. . . . . . . . . 28-2726
Tube Shield Base .. . .. .. .. . . . . . . 28-3898
I. F. Shield. .. .. .. .. .. .. . .. .. .. .. .. .. .. .• .. .. .. .. 38-7763
Terminal Panel I. F. Unit . 38-7703
Washer I. F. Unit.... .. . . .. .. .. .. .. .. .. 28-4001
Wiring Panel.. .. .. .. .. .. . . . . . . . .. .. .. .. .. .. .. . 38-6306
Wiring Panel Power Unit. . .. . . .. ,. .. .. .. .. .. .. 38-5864
Grommet Mtg. Tuning Condenser .. . 27-4325
Grommet R. F. Unit .. 27-4317
Sleeve Mtg. R. F. Unit...... 28-2257
Spacer Mtg. R. F. Unit. .. . 27-8339
Screw Mtg. R. F. Unit.. W-72~
Washer Mtg . R. F. Unit ............. 28-3927
Insulator Mtg . Electrolytic Condenser.. 27-7194
Bracket Mtg. Eleetrolytic Condenser. . 6440
Antenna Panel. . . 38-7714
8peaker Cable.. L-2181
A. C. Cord .. . .. L-2183
~;~Et~:J:ttiicf H~m
·Knobs Tone & Volume...... . . . . .. .. .. . . .. .. .. .. .. .. 27-4332
8hadowmeter Lamp Shield . 28-2917
8hadowmete r Mtg. Spring 28-8623
MODEL T CABINET
Bezel Frame & Plat e Assembly ..
Bezel Frame Gasket ..
Bezel Frame Rubber .
Bezel Frame 011185..
Bezel Frame Ring .
Speaker K-38 ......... .
Baffle & Silk Assembly ... . ........ .......... ..
MODEL X CABINET
Bezel Frame & Plate Assembly
Bezel Frame Gasket ..... .
Bezel Frame 011185... .
Bezel Frame Ring ..
Speaker H-24. .
Baffle and Silk Assembly.
Prlcea Subject to Chanll,e Without Notice
40-5937
27-8311
5198
27-8298
28-3967
36-1262
40-5973
40-5945
27-8312
27-8299
28-3087
36-1224
40-5972
Llat
Price
f0.15
.40
1.10
1.00
1.10
.50
.35
.50
.12
.10
.02
.10
.02
.01
Per C .30
.01
.25
.75
.30
.35
.15
Per C .50
.30
Per C .50
.02
.10
Per C .40
.03
Per C .75
.11
.11
.10
.03
.20.
.25
Per C .25
.03
.02
.02
.04
.01
Per C .40
Per C .45
.01
.01
.05
.15
.25
.40
.10
.10
.10
.10
.02
.01
.05
.35
Printed in U. S. A.
- .,,.✓-
philcoradio.com