Philco 118 User manual

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PHILCO
UO.U.&,AT. or,
Service Bulletin~ No. 194
Model 118
Philco Model 118is an eight tube :superheterodyne radio receiver operating on alternating current
(A. C.) and designed for reception on either the standard broadcast band (including police bands up
to 1720 K. C.), or a major section of the short wave band . A two-position switch changes reception
from broadcast to short-wave. The frequency ranges are 540 to 1720 K. C. and 4.2 to 12 megacycles.
Model 118is equipped with shadow-tuning, four point tone control with fixed bass compensation,
and automatic volume control. The power consumption is 110 watts and the undistorted output of
the Super Class "A" Amplifier is 10 watts. The intermediate frequency (1. F.) is 2~9K. C:
Model 118 is equipped with the following tubes:
R. F... :........... . ..... .. .. . . ... . ...... .Type 78
Detector-Oscillator .... . . . . . . .. .. . . . . ...... Type 6A7
I. F•.. ... ........ . . . .... . .. . . . ........... Type 78
2d Det. 1st A. F...... ... .......... . .. . .... Type 75
Driver ....... . . . ... . ................... .. Type 42
Output tubes (2) (Connected as triodes) .. .. . .Type 42
Rectifier . . . . ..... . ........... . ..... .. ..... Type 80
Tube Socket Voltaaes-Line Voltaae 115 Power Transformer Voltages
Fllllltlon R.F. Ott.- ,.,. A.F. Drlv• Output Rect.
Ole. Terminal, A.C. Volta Circuit ColorofLlld1
-- -- --
Type 78 IA7 78 71 42 42 42 80 1-2 120 Primary White
-- -- --
Filament(F-F).... .. 6.3 6.3 6.3 6.3 6.3 6.3 6.3 5.0 3-6 6.3 Filaments Black
--
Plate (P-Kl .. ... .... 180 180 200 125 195 280 280 315 6-7 6.0 Filament of 80 Blue
Screen(80-K) ....... 80 175 80 ... 195 290 290 ... 8-10 760 Plates of 80 Yellow
Cathode(X to F).... 2.5 2.6 3.2 0 0 0 0 ...
--
0A7·O1 toX ....... . 26 4 ... Center Tap of 3-6 Black-Yellow Tracer
--
GA7· G•to X... .... . 150 9 ... Center Tap of 8-10 Yellow-Green Tracer
The above testsweremade with an A.C. voltmeterforfilamentvoltageeand a high resistanceD. C. voltmeter forall other11.Dial at 650K. C., wave band switch
to left, volumeoontrolat muiinum.Teats made with test prodl applied to socketsunder11e11thchauia. PhilooModel048 All-purpooeTeater or Model 025Circuit Teater
arerecommendedforthese tests. UseFi&, 1in makin&tesla givenin left hand table above.
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Fig. 4. Base View
Replacement Parts for Model 118
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DI.- Description Part No. Price Diagram Description Part No.
iW..-e Trap_..... .. ....... ..... ... , ................ , 3S-S740 ,45 @ Resistor (50,000ohms) (Green-Brown-Orange)..... .. . . 4518
Com-""' Condewier (Ant.-H. F.) ................ 04000D S0.15 @ Condenser (Electrolytic I, I, I, and 2 Mfd.) .... ....... 30-2078
a....ter (10,000ohms) (Brown-Black-Orange)..... .. .. . 33-1000 .25 @ Resistor (.I Meg.) (White-White-Orange).............. 4411
© Antenna Transformer ............................... 32-1378 1.00 @ Resistor (.5 Meg.) (Yellow-White-Yellow)..... .. ...... 4517
Tuning CondewierAssembly......................... 31-1173 6.25 @) Condenser (.0001 Mfd. Mica)................. .. ..... 4519
Compensating Condenser (Ant.-Broadcast) ............ Part of© @ Tone Control...... ...... ...... . . . .... ... ...... .... 30-4186
Llat
Price
$0.25
2.45
.25
.25
.35
.35
.75
I
Wa~eBand Switch.... . . . ........................ . . 42-1046 80 @ Condenser (.015 Mfd. Bakelite Block)................ . 3793F
Resiolor(400 ohms Flexible Wire-Wound)............. 33-3016 .20 @ Condensers (In Tone Control) ........ . ............... Part of@
Condenser (.05 Mfd.) (Bakelite Block)........ ........ 3615BK .35 ICondenser (.006 Mfd. Tubular) ...................... 30-4024 .40
Resistor (70,000ohms) (Violet-Black-Orange)...... : . .. 5385 .25 Input Transformer ..... ............................. 32-7114 2.00
@ Condewier(.05 Mfd.) (Tubular) ...... ....... .. . ...... 30-4020 .35 Resistor (10,000ohms) (Brown-Black-Orange)......... 3524 .25
@ Detector Transformer ........................ ....... 32-1379 .70 ICondenser (.01 Mfd. Bakelite Block)............... . .. 3903P .25
Compensating Condenser (Det.) ............. . ........ Part of© Voice Coil and Cone Assembly.... .... .. . .......... . . H-13--02625 .80
I
Condenser (.000016Mfd.) (Mica) ......... .. ......... . 30-1030 .35 Output Transformer ................................ 32-7078 1.40
Resistor (2 Meg.) (Red-Black-Green).. . ........... ... 5872 .25 K-17-36-3020 .60
@ Condenser (.05 Mfd.) (Bakelite Block).............. . . 36!5D ,35 @) Field Coil and Pot Assembly........... . ............. 36-3104j. 2.70
@ Con_denser(.05 Mfd.) (Tubula~)........ . ......... . ... 30-4020 .35 iResistor (Wire-Wound) (6500 ohms) ............. . . . .. 33-3033
1 .30
@) Resl8tor (300 ohms Flexible Wire-Wound)... .. . ... . ... 33-3010 .20 Resistor (Wire-Wound) (9.5, 112, 84 ohms)....... .. ..• 33-303/ .20
Resistor (50,000ohms) (Green-Brown-Orange).. .... .. . 4518 .25 @ Condenser (.05 Mfd. Tubular) ....................... 30-4020 .35
iCon.denser(.05 Mfd.) (Tubular) . . . . . . . . . . . . . . . . . . . . . 30-4020 .35 2 Volume Control and On-OffSwitch................... 33-5024J 1.45
Compensating Condenser (Osc. H.F. Bdcst.) ....... . . . Part of© @ Resistor (240,000ohms) (Red-Yellow-Yellow)....... . .. 4410 .25
@ Compensating Condenser (Osc. H. F. Shortwave) ....... 31-6016 .30 @) Resistor (10,000ohms) (Brown-Black-Orange)..... . ... 4412 .25
@ Oscillator Transformer .............................. 32-1380 .70 @ Condenser (.025 Mfd. Bakelite Block).. ...... . . . . . . . . . 7653D .35
•® Condenser (.0008 Mfd. Mica)........................ 5878 .35 @ Resistor (32,000ohms) (Orange-Red-Orange).......... 33-1026 .35
@ Resistor (20,000ohms) (Red-Black-Orange)...... ,. .. . . 6650 .25 @ Resistor (50,000ohms) (Green-Brown-Orange)... ... ... 4518 .25
@ Resistor (20,000ohms) (Red-Black-Orange). ...... . . . . . 6650 .25 @) Condenser (.015 Mfd. Twin) (Bakelite Block). .. .. . . . . . 3793R
@) Pilot Lamp (Station Selector)........................ 6608 .ll @ Power Transformer................................. 32-7111
@ Compensating Condenser (Osc. L. F.) ................. 04000R .45 @ Filter Choke... .... . ... ... ......................... 32-7115
iCondenser (.003 Mfd. Mica)......................... 7301 .45 @ Condenser (.25 Mfd.).......... ......... ...... ....... 6287-R
Compensating Condenser (1st I. F. Pri.) ....... . . . ... .'. Part of @ @ Condenser (Elec. 8 Mfd. 10 Mfd.). . . . . . .. . . . . . . . . . . . . 30-2045
1st I. F. Transformer ... . ...... ... ............... . .. 32-1381 1.50 ® Condenser (Elec. 8 Mfd.).............. ..... ......... 30-2025
.40
5.75
l .80
.40
1.96
2.00
@ Compensating Condenser (lot I. F. Sec.). ...... . , ..... Part of@ @ Compensating Condenser (2d I. F. Secondary)...... ... Part of@
@ Resistor (500 ohms Flexible Wire-Wound)............. 6977 .20 @ Resistor (2900ohms) (Red-White-Red) ................ 5309 .25
@ Condenser (.05 Mfd.) (Bakelite Block)................ 3615AU .35 Chassis Mtg. Screw............................. .... W-1345A 2.25C.
@ Shadowmeter...................................... 6497 2.50 g~~!s ~~· fash(]R ..b.be... ).... · .... · · · · .. · · .. .. · .. · 29-2089 .35C.
I ,.;,, """"18 g. oot P u r ........ .. ......... :.. ... 27-4116 .05
Shadowmeter Pilot Lamp ............................ Part of®, Chassis Mtg. Foot late ......... .. ......... . ... .... 27-7497 .36C.
Compensating Condenser (2d I. F. Pri.) .............. . 04000A ,15 Knob Assembly(Large).... .. ............ .... .. ..... 27-4051 .JO
@ 2d I. F. Transformer (Early Prod. 32-1258)............ 32-1424 ~~ 1
\Z:Shf
1
Y(Small).... ·· · ······ ········· .. ••• •• 27-4052 .JO
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@ Con.denser(.01 Mfd. Bakelite Block).................. 3903Z .25 6 Pr Sook t ·10
@ ReslBtor(I Meg.) (Brown-Black-Green)........... . ... 4409 .25 oag e ...... · · · · · · .... .. .. · · · · · · · · · · · · · · · · • 7547 .11
r.:i, • • 7 Prong Socket.. .. .. . . . .. . . . .. . .. .. . .. . • .. . . .. . . . .. 27-6005 .11
-& Resistor (.5 Meg.) (Yellow-White-Yellow)............. 4517 .25 Speaker Sooket... .... ............... . ... .. ..... 4957 10
@ Condewier (.0?Mfd. Bakelite Block).......... ........ 4989D .35 A. C. Cord and Plug.... .. . ......... ............ :::: L-943A :60
*Sil°Note below.Fi~,'4, Note: Part@, isas show~above only in early production. In later production this part i., incorporated as part of@. not vi.siblefrom below.
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Page 4 PH I LCO
Service Bulletin No. 194
Adjusting Compensating Condensers
For adjusting compensating or padding con-
densers in Model 118, an accurately calibrated
signal generator covering the broadcast range of
frequencies is required and also a crystal con-
trolled signal generator for the high frequency
adjustments. For the former we suggest the
Philco Model 024 Signal Generator and for the
latter the Model 091, Crystal Controlled high
freq.uency signal generator. The actual adjusting
calls for a special insulated hex wrench and
insulated screwdriver. Philco Part No. 3164
·Fibre Wrench and No. 27-1159 Screwdriver are
·recommended. An output meter is also required,
.for connection to the receiver.
I. F. ADJUSTMENT-The I. F. (intermedi-
ate frequency) of Model 118 is 260 K. C.
Remove the grid clip from the top of the 6A7
tube and connect the shielded antenna lead from
the Signal Generator to the cap of this tube.
Connect the ground lead of the Signal Generat or
to the ground post of receiver. Connect the
output meter to the primary terminals of the
output transformer of receiver . Set the wave-
band switch at the left position (standard broad-
cast).
Set the wave switch on the Signal Generator at
260 K. C., and the dial of the receiver at 550.
Turn on the set (volume full on), and the Signal
Generator. Now adjust the 1st I.-F. Primary and
Secondary condensers (Nos. @)and @ in Fig. 3)
and the 2d I. F. primary and secondary con-
densers (®and @) to give maximum reading on
the output meter. The I. F. primary condenser
is adjusted by turning the screw on top of the
I. F. transformer and the secondary is adjusted
by turning the nut. The I. F. transformers
are in the smaller metal "cans". The screw and
nut are reached through the hole in top. If the
:r;ieedleon the output meter goes off the scale,
turn down the "attenuator" on the Signal
Generator until a lower reading is obtained.
Note: In early production the 1st I. F. com-
pensating condensers only are adjusted as
described above. Part @ is not used. The 2d
I. F. primary ® is an 04000A condenser reached
and adjusted through hole in top of chassis near
the 42 driver tube.
WAVE TRAP - Remove antenna lead from
grid cap of 6A7 tube and attach it to antenna
post on set. Replace cap on 6A7 tube. With
Signal Generator still operating at 260 K. C.,
adjust wave-trap condenser (© in Figs. 3 & 4)
so as to get MINIMUM reading in output meter.
This adjustment is made from underneath the
chassis.
ANTENNA, DETECTOR AND OSCILLA-
TOR H.F. (Broadcast)-These condensers Nos.
!J), @, and ®, are located on top of the tuning
condenser gang, adjustment made by means of
the fibre wrench . Set the signal generator at 1500
K. C., tune in the signal at 1500 on dial and
adjust these condensers in the order given, to
give maximum output reading. !J) is located on
the section nearest the front and @ on the center
section.
OSCILLATOR-LOW FREQUENCY-This
is condenser @ (see Figs. 3 and 4) located under-
neath chassis and accessible from underneath.
Use the fibre wrench. Set signal generator switch
at 600, tune in the signal at 600 on the dial and
adjust condenser to maximum.
ANT. AND OSC. H. F.-SHORTWAVE-
The crystal controlled signal generator is used
for these adjustments. These are condensers ®
(Ant. H. F.) and @ (Osc. H. F.) located under-
neath chassis, and adjusted from underneath.
The fundamental frequency of the Philco Model
091 crystal controlled signal generator is 3600
K. C. or 3.6 megacycles. The third harn;10nicof
this is 10.8 M. C. Turn the waveband switch
of the set to the right and the dial to just below
11 M. C. The 10.8 harmonic should be picked up
here and the two condensers should be adjusted
to give maximum reading on the output meter,
on this signal.
USE PHILCO REPLACEMENT PARTS AND TUBES FOR EVERY MAKE RADIO.
June, 1934
Printed in U. S. A
GET COMPLETE CATALOG FROM YOUR DISTRIBUTOR.
PHILCO RADIO & TELEVISION CORPORATION
Service Department
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