Philco 34 User manual

PHILCO
..,11.1,.,..,.0,,
Service Bulletin,...No. 188
Models 34 and 34A
Philco models 34 and 34A are superheterodyne "all
wave" receivers designed for reception of both broadcast
and short wave stations; they operate from batteries as a
source of power. Model 34 is intended for use with a
2-,o lt storage battery and a dry B-and-C battery unit;
model 34A uses a dry A battery in connection with the dry
B-a.nd-Cunit.
~fodel 34 uses seven tubes; model 34A has in addition
a ballast tube (type l-C-1) . The chassis of the two sets
are identical, but the model 34 when shipped has a jumper
wire across the filament contacts of the ballast tube (l-C-1) ,
eocket. This wire should be left in place as long as the set
is operated on the storage battery. In model 34A the
jumper wire is removed and the ballast tube (l-C-1) must
be in place at all times.
~!odel 34 uses the following Philco low-current-drain
2-,o lt tubes:
Detector Oscillator. . .. .. . . . . . . . . .. . . 1C6
Intermediate Frequency (2). . .... . . . . 34
2nd Detector . .. . . . . . . . . . . . . . . . . . . . . 30
1st A.F. .. .. . .... ... . ... . . . .. . .... . . 32
Driver ...... . .. .. .. .. ... . ... . . ..... 30
Output.. . .. .. .. . . .. . .... . . . ....... 19
Ballast (34A only) ...... . ...... .. .. .l-C-1
~ ode! 34 is intended for use with the Philco type 172-R
2-volt storage A battery , model 34A uses Philco type 896
dry A battery . Both sets use the Philco type P968
combination B & C battery unit .
The current drain is: A battery-750 milliamperes ;
B battery-16 to 19 milliamperes. The ballast tube used
in the model 34A keeps the voltage delivered by the dry
A battery to the filament at nearly two volts at all times.
The •Intermediate Frequency of the set is 460 Kilo-
cycles. The range of receivable frequencies is 520 to
22,000 K.C.
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CONTROi.
FIG. 2-Position of Compensating Condensers
Reached from Above Chassis
Table I-Tube Socket Data•
Dtl .• ltl 2nd 2nd lat OUI•
CIRCUIT Oec. I. F. I. F. Oat. A.F. Driver put
- - -- -- -- -- - -
TYPETUBES 1C8 34 34 30 32 30 18
-- -- -- -- -- --
Filament Volts. . ..... . .. 1.9 1.9 1.9 1.9 1.9 1.9 1.9
- - -- -- -- -- - -
P-136
Plate Volts......... ... . 02-120 136 136 .. 40 136 136
-- -- -- -- - - - -
Screen Grid Volts. .... ... 67½ 67½ 67½ .. 36 .. ..
•The above values were obtained from the underside of the chauia, uaing teet
prods and leade, with a high-resistance multi-range D. C. voltmeter. The Philco
Model 048 All Purpoee Set Tester is highly recommended for all t<!Stsof this
character . Receiver volume control at maximum ; stat ion selector at 620 kilo-
cycles. Readings taken with a !'.lug-in adapter will not beaatiBfactory.
FIG. I-Top View of Chassis
l"AUDIO
34
2••1.r.
'"'·'·
34
30 19
□
DRIVER OUTPUT
[J]
IALlAH '
G
FIG. 3-Tube Socket Layout (View of Underside )
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FIG. 4,-Schematlc Wiring Dlaa,-am
'GROUIIDTOCAN
NOTE: Output tran9'onn.- Is mounted on receiver (under ei-18) lnatead IJfon lljleakeru •lnclcaied In dlagnm. Also .,....er -.,..t 11not grounded.
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philcoradio.com

No. 188
PH I LCO
Service Bulletin
FIG. 5-Bottom View of Chassis, Showing Parts, and Position of Compenaatina Condensers
Reached from Below Chassis ·
MODEL 34 PARTS
...
r,.._ DNCl'lptlon Part No.
v.,v ~Band Switch.............. .. ......... .. 42-1045
'lone Trap... .. ....... .... . ....... . . .. . .. .... 38-6199
T~ g CondellllerAssembly
................ .... 31-1153
!.oWlll& Transformer(H. F. Bands).. .. .... . .... 32-1271
C..:.odeneer(.00025mfd.)........ . . . .. . .. . . .. . . . . 3082
Br~ CondenserBlook(.26-.5-.06-.06-.05mfd.) . 3().(151
1 C:znpenestin.g Condellller(Ant. H. F.). .. . . . .. ... Part of ®
Can penestingCondenser
(Ant. B'cst) ..... . ..... Part of®
t .U \enna Trallllformer(Broadcast)... .. . . ... . . .. . 32-1270
a..is tor·(l0,000obms-Brown-Black-Orange).... . 33-1000
· tor Trallllformer(H. F. Bands).... ... ... •. 32-1273
penesting CondellllOr(Range 2). ...... . ..... 04000-('
tor Trallllformer(Broad0118t)... ...... . ... 32-1272
I C.:cpenaat ing Condenaer(Oeo. Range 1)... . . .... 04000-A
C-oo~ti ng Conden8er(Oeo. Range 4)... . . . . . . Part of @
C= penaating CondellllOr(Otc. Range3)... . . .. . . Part of ®
R..;..wr (50,000ohms-Green-Brown-Orange). . . . 4518
C ponsating Condenser(Broadcast;Series)... ... 04000-S
O:c,pen.,atingCondeneer(Range2; Series)... .. .. 04000-R
C-OOdenoer(.0007mfd.).......... .. ... ... ... .... 5863
21 C ser (.003mfd.)......... ... .. .. .. .. . ..... 6009
C~ nm (.0008m!d.l. ..... .... ........ ... .... 6021
21 P..era:wr (5,000ohms-Green-Black-Red)..... . .. . 5310
a,,,.;,.wr(100,000ohms-White-Whit~Orange) .. .. 6099
ttm I. F. Transformer.............. . .. . ....... 3:i.,1341
Coc ponsating
Condeneer(let I. F. Pri.).......... (31-6007,
ilnc. 11
1
28 C<mi;,ensating Condellller(let I. }'.Sec.)......... \part of @
S....nd I. F. Transformer.. ............. ....... . 32-1341
Com;,enssting_Condeneer
(2nd I. F. Pri.)... .. . . . .{31-6007,
Inc. u
I
C-0m;,ensating Condenser(2nd I. F. Sec.)... .. .. .. part of@
n C-0~ (.26-.26m!d.)(By-pass).. . ....... . . .. 3().(150
: 3rd l. F. Transformer............. .. .... . .. .... 32-1342
Compe=ting Condeneer(3rd I. F. Pri.)... .. . .. .(81-6007,
1Inc. as
@ CompematingCondellllOr(3rd I. F. Sec.)......... (part of@
Li.t
Prtee
Each
IUO
.80
8.26
.70
.35
1.00
.55
.26
.35
.15
.70
.15
.26
.35
.45
.35
.60
.35
.25
.26
1.85
1.85
.70
1.35
DNW!ptlon· '.· PartNo.
Condenser(.00011m!d.twin).. ... ....... .. ..... ~C
Condenser(.05m!d.)..... c•• •••••• : •• ••• ••••••• 8616-J
Resistor (1,000ohme-Brown-Blaok-Red).·. ...... 5837
Resistor(50,000ohms-Green-Brown-Orange)
.... 4518
Resistor (2 meg.-Red-Black-Oreen) ... :....... , . 5872
Condenser(.01m!d.).. .... ...... ...... . .. .. . ... 3().(124
VolumeControland On-OffSwitch.... .......... 83-5064
Resistor (1.0meg.-Brown-Black-Oreen).... .. . . . 4409
Resu,tor(330,000ohma-Orang~ng~Yellow) .. 4410
44 R~istor (.25meg.-Red-Yellow-Yellow)....... .. . 6046
IResistor(70,000ohms-Violet-Black-Orange)..... 5385
Resistor (.5 meg.-Yellow-Whit~Yelloir) ......... 41117
7 Conde= (.01mfd.).. .... ... . ...... . ... . . . ... 3().(124
1
48
609
Tone Control.. .. .... . .... ... .. . . ...... . •... .. 3().(152
Audio(Input) Transformer... . . ... . . .. . •••. .. . . 7233
Conde= (.003mfd.).. ...... .. . . . . .. . . .. . •. . . . 7301
i
Output Transformer..... .............. ,•. .. ... 32-7223
.! VoiceCoil&:ConeAe,embly(KR-6)... .... .. . ... 36-3157
-Pilot Lamp........ .. ... . . . .............. . .... 5316
CondellllOr
(.01mfd.)............. . ....... . . . ... Part of@
Pilot Lamp Bracket....... .. . . .. . •. . .. .. . .•. . . . 38-6633
Battery Cable.. ..... . . .. .• .. ... . ....... . ..... . 41-3083
Tub(Shield (1)....... . ..... .. ... .. .. .. ... . . . . 28-1107
Tube Shield(2)........ .•..................... 8005
SixProngSooket ... . .. . ... .......•..... . •. .. .. 7547
f'our Prong Socket......... .. .... . .. .. .. ...... . .7544
Speaker Socket. . ... ... . .. . . . . .. .. •.. . .. ... ... 4g57
Knob (Medium)........ . .. . . ... 03063
Knob (Small)..... .. .. .... .. . .. .... .... . . ... .. 03064
Knob (Large)... . . . ..... . . .... 27-4026
Dial Assembly..... ... . ...... . ........ ... . .... 31-1162
Dial Scale.. . .. .. . .. . .. .. . . ... . . .. . . . ... . . . ... . 27
-6039
Idler Shaft Assembly.... . .... . . .. . . . .. . . . . .. . . 31-1056
Gear (Wave-BandSwitch).. ....... ... ... ..... . . 28-7012
MountingBolt.... ... .......... . .... ... .. ... . . W-567
MountingWasher(Rubber). . . .. . 51811
MountingWasher(Steel)...... .. . .. . . .. . . . . . . 5058
Page 3
Llat
Prtca
Eich
~-24
.36
.25
.26
,26
.25
1.46
.26
.26
.26
.26
.26
.26
.50
1.80
.46
1.50
.50
.86
.55
2.00
.10
.06ea.
.11
.1-0
.10
.10
.10
.10
1.26
.60
.26
.20
3.00per c.
.04
.8Gper C.
philcoradio.com

Page 4 PH I LCO
Service Bulletin No. 188
ADJUSTING MODEL 34 ·
The compensating condensers of Model 34 have been
adjusted accurately before shipment. If later adjustment
is required, in most cases only the intermediate frequency
and low frequency compensating condensers should be
done. Extreme care must be given the adjustment of the
high frequency circuits, and the adjustment should NOT
be undertaken unless the receiver is seriously out of
alignment.
DO NOT ATTEMPT TO ADJUST the compensating
condensers mounted upon sections numbered 3 and 4 of
the Tuning Condenser Assembly. These have been
adjusted , and sealed, at the factory.
Philco Model 048 All-Purpose Set Tester, which incor-
porat.es a signal generator covering broadcast and police
band frequencies, is recommended for the adjustment of
the intermediate frequency and low frequency com-
pensating condensers.
Philco Model 091 crystal-controlled Signal Generator is
recommended for the high frequency adjustments . It
gives an accurate and constant 3600 kilocycle (3.6 mega-
cycle) signal, the harmonics of which include the necessary
high frequencies for adjusting the compensating condensers
in the high frequency circuits.
I-ADJUSTMENT OF THE INTERMEDIATE
FREQUENCY-Remove the_grid clip from the type 1C6
tube and connect the "ANT" output terminal of the
signal /fenerator to the grid cap of the tube. Connect the
"GND' terminal of the signal generator to the "GND"
terminal of the receiver chassis.
Connect the output meter to the primary terminals of
the output transformer. Set the signal generator at
460 KC. (the intermediate frequency of Model 34) and
adjust each of the I.F. compensating condensers in turn ,
to give maximum response in the output of the receiver. ·
The location of the I.F. compensating condensers is shown
in Figure 2. Each of these transformers has a dual com-
pensating condenser mounted at its top, and accessible
thru a hole in the top of the coil shield. In the dual com-
pensators, the Primary circuit is adjusted by turning the
screw; the Secondary circuit is adjusted by turning the
.hex-head nut.
2-ADJUSTMENT OF THE WAVE TRAP-Replace
the grid clip upon the Detector-Oscillator tube (Type 1C6).
Connect the output leads from the signal generator
directly to the . antenna and . ground . terminals of the
receiver. Set th\! Wave-Band Switch of the receiver to the
standard broadcast band (Range 1) and the Station
Selector at the low frequency (520 KC .) end. Adjust the
Wave Tr~p q) condenser to give MINIMUM response to
a 460 KC. signal from the signal generator. The Wave
Trap © is located at rear and underneath the chassis, and
is shown in Figures 2 and 5. It is reached from the rear
of the chassis.
3-ADJUSTMENT OF THE DIAL FREQUENCIES
_;_Model34 has four separate frequency bands or ranges,
each obtained by one of the four positions of the wave-
band switch. There is a compensating condenser for each
range, which must now be adjusted. In the following
procedure, the frequency ranges referred to, and obtained
by the different positions of the switch are:
Range 1. ... . . .... . .520 KC .-1500 KC.
Range 2............ 1.5 M.C.-4 .0 M.C.
Range 3... . . . ..... .4.0 M.C.-11.0 M.C.
Range 4........ .. .. 11.0 M.C.-23.0 M.C.
Connect the output terminals of the Model 091 or
equivalent Signal Generator, to the "ANT" and "GND"
terminals of the receiver chassis. Connect an output
meter to the primary terminals of the Output Trans-
former of the receiver. Set the Wave-Band Switch to
Range 4, and the Station Selector at 21.6 M.C. The sixth
harmonic of the 3.6 M.C. crystal in the Model 091 Signal
Generator is picked up at this point. Adjust the com-
pensating condenser @ on ~ection 1 of Tuning Condenser
for maximum response in the output of the receiver.
Turn the Wave-Band Switch to Range 3, and the
Station Selector to 10.8 M.C. Here, the third harmonic
of the 3.6 M.C. crystal will he heard. Adjust the com-
pensating condenser @ on Section 2 of Tuning Condenser
for maximum response in the output of the receiver.
Turn the Wave-Band Switch to Range 2, and adjust
the Station Selector to 3.6 M.C. The "Antenna" connec-
tion between the Signal Generator and the receiver chassis
must be removed for this adjustment , otherwise the output
of the Signal Generator will be too great. Adjust the
compensating condenser @ to give maximum re.'lponsein
the output circuit. This compensating condenser is
located underneath the chassis and is not acces.'liblefrom
above. See Figure 5.
This concludes adjustments requiring the Model 091
(or equivalent) high frequency signal generator.
The Model 048 or its equivalent is now used again.
Tum the Wave-Band Switch of the set to Range 2 and the
Station Seleetor to 1.5 M.C. Set the Signal Generator .at
1500 K.C. Make sure the "Antenna " connection between
··the Signal Generator and the Chassis has been restored.
A_djust compensating condenser @ locat~ underneath the
chassis, (Figure 5). Adjustment is made from the under-
si!-Jeof the chassis. ·
;'Tune the Wave-Band Switch to Range 1and the Station
Selector to 1400 K.C. Set the Signal Generator at 1400
K-.C. Adjust compensatin_gcondenser @, which is located
underneath the chassis. (See Figure 5). This adjustment
is made from the underside of chassis.
Finally, with Wave-Band Switch at Range 1,and Station
Selector at 520 K.C., set the Signal Generator at 520 KC.
and adjust compensating condenser @ (Figure 5). This
compensating condenser is also mounted underneath the
cha11Sis,and reached from below.
For proper and accurate adjustment of Model 34,
the procedure must be followed exactly In the order
given. The adjustment should not be undertaken
without proper equipment as mentioned above.
USE PHILCO REPLACEMENT PARTS AND TUBES FOR EVERY MAKE RADIO. GJT
COMPLETE CATALOG FROM YOUR DISTRIB UTOR.
PHILCO RADIO AND TELEVISION CORPORATION
Maroh,1934
J'rinted in U. S. A. Service Department
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