Firestone Tire & Rubber Co. 4-A-67 Schematic

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Product Information:
Model:4-A-67
Manufacturer:Firestone Tire & Rubber Co. (Air Chief)

Schematics Content:

Please note: this content is a computer-generated interpretation of the above schematic and is provided only to help assist you in locating this schematic. For the actual text, please consult the schematic above. Thank you.

Page 1:

PAGE 19-24 FIRESTONE .'

THE FIRESTONE TIREA Ss RUBBER CO.

OM ang o- mum mUZim UZHZDH

iwsum 2.35th .Boa cog
"55.590 forum

.2d moan m

monuhu cow E Emo N." mOZ

(C)John F. Rider

Page 2:

THE FIRESTONE TIRE 81, RUBBER CO.

...Simon 32.80 2 25a. wc: _m2 E .ravme from ao.. mmou Icom: _Eu
2me E 2229.53 noun 52.25? :5_5me .1:2 ?52.. EF.: ,.wwcwucou mcmw mic.; .3 ...2.53.33 _in ,wing .-3.5 AN.
:22.515.me mi as... 2.5%:me B :.3 .$333 ui ww_>>.wio\=(R)>_m .2:5 mi E can .?5953 23.395 ...5:3 2 3.5 mm

(C)John F. Rider

Page 3:

MODEL 7 THE FIREST TIRE 8s RUBBER 66.

Be sure R.F.and I.F.stages are accurately aligned before measuring
gain. R.F'. gains can be measured with a "channel" type instrument
,nnt'eiin.'.i1g a tuned and calibrated R.F.amplifier. Avacuum tube volt-
:neter may be used for audit- gain measurements. Observe following

1. For all gain measurements 2A Be sure radio is 3. When using a "chan-
connect signal generator as carefully tuned nel" type instrument
shownr Use 600 KC. signal to generator carefullv tune it for
with 400 cycle modulation signal(use weak maximum output at
(use nearby frequency if signal for sharp desired frequency be>>
local station interferes.) tuning.) fore making measure~
in sen rr renee.an ern. r. A., .e .r nm errrs n .re miss

winner

Differences in tube characteristics, tolerance of parts, adjustment
of tuned circuits, and variations of line voltage will influence
stage gains. Accuracy of measurements is dependent upon careful
tuning of receiver to generator signal and experience in using your
test equipment. These factors may create considerable variation in
gain measurements. `

PARTS LIST
Iliins' F rtN Pen Name nzssrinrian m PmENm Pig "3"" T b | Dmrmini'Md 2 V
3 20E2l>l C<>il *S* ' ' ~' ie zseii cendenser Fired cerernie, .000| Mid. 500 v
of v l i7 23542 condenser Mies. .00025 Mid. 500 v.. .,
4 zoEzbl-s Coil 20d IAF- Transfmmef >> iq 27e335 Resisier Gerber., 3.3 Megelnn, |/3 wer
or 20 27E335 Resisier carbon, 3.3 Megenrn, |/3 Wei
20E301-3 Coil 20d |~F~ Transfwmef 2| 275115 Resisier cersen, 4.7 Megenrn, i/a wen
5 20E77 Cell Oscillafor 22 27E|06 Resisier Cerben. lo Megelnn, |/3 Wei
7 25E9 Condenser Tubular, Dry Eled. lo MH. 100 V. Z4 27E|04 Resign" Carbonv wagon OhmI
i 9 2352224 Condenser Tubular, .5 Mid. 200 V. .. 26 27E470 Resistor Carbon, 47 Ohm` l/3 Wait.
Io 23El5| Condenser Tubular. .0| Mid. |20 v. , 21 23:11 ve|.c?n|re| wins D.P.s.1. sw eh, 500,000 ohm.
ii 23Ei5i condenser Tnbnler, ,0| Mid` |20 v. . 28 IE? Speaker 5" PM.> , ,
wig-s; Sealigxilestnsk gilllixtcgilrxiflf ` 361:40 :n_ini scale cnubracedms'cnie .
20525511 Dial cnrd Drivecnrd Assembly 3555 DEH'PU'Q'" D'a' "Hd" ~~~~~~
65E2 Dial cnrilsnring Dial cnrd Tenrinn s 35515 Dial Innisninr "oN-orr" Inilrmnr .
. .,. "iii-di iii li:::...";:i.n~nn
Assembly Drive shafl Assern y ...... 4554 me_AH-" mmm; "NWFP, 'mmm H
MOUNTING HARDWARE I
` Part N . ' D ' '
1;'52'50 Pwawe Meal wgsiisfrr'ilie'ihiln 32:36 smw lm Min. assi 12522 Pwns'iizl" Fings waslifrrigimmnnununu Dial snail...
_Lower ninni s me cnrners ............. .. 125104 washer swing wesnrr :nr Mnnniinn nrni scale
szzss ssrew s-zoxs/ls Rd, aes. nn. snsiieprnni me N 25 13510342 wnsnsr sneer: ciin washer :nr Min, Disi seals
"sen wiin 1256 wesner . 52555 siren s-1sx1/2 mi. me, nn. snsmrnnr
32;; Sryew A-ZAxl'4 Rd. Rec Chassis Mnuntinu vafnl
For Mig. Dial Scale .. . 12E114 washer Sums! washer used wms 325
10543 Slud Trimuunt Siud ln Mount Cahinci Back .....

(C)John F. Rider

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