General Electric Co. 202 Schematic

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Manufacturer:General Electric Co. (Old RCA)

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Page 1:

Thrs model rs the same as model 414
f` appearing on page 11-2 of Ride/J Vol
Electronic Laborulones 2811
Thrs model shown on page 16 8 of
Rfdefr Volume XVI, uses the Webster
model 56 record changer which rs shown
on page RCD CH 15 10 of Rule/J Vol
Emerson B1-'ISS BF 204. And BF 207
These models are the same as Model
BF 191 appearrng on pages 9 1 and
9 2 of Rzdefs Volume IX
Emerson 567 Chussrs 120016
Thrs model rs the same as Model o60
Ln 17 92 0/ Rtders Volume XVII
PM Speclcltres Model
Thrs model rs shown on pager 171 lo
I74 of Rule: r Volume XVII Three ter
mrnals are shown rn Frg 5 page 17 4 the
Frrst labelled 3 and the thrrd termrnal not
labelled rn thrs Hgure) should be labelled
4 The ground from the phonograph con
ncctron to the rccerver should be made to
thrs third termrnal termrnal 4
Thrs model rs the same as model ACL
55 Chassrs C 2 5 shown on pager 11 7
and 11 10 zo Ruler? Volume Xl
These models shown on pager 11 7
and 1110 of Ruler; Volume XI are
erroneously lrsted as ATL
blrppuge of the dral tlr'r\e table on
the early productron sets can be cor
rotted by replacrng the cable wrth part
number 00096 Thrs cord rs solttr
and smaller than the one used pre
11 the push buttons brnd on tlrt
front panel of the cabrnet, the garwul
capacrtor may not he properly P051
troned Thrs may be corrected by rn
stallrng a flat metal washer undtr
each of the rnourrtrng grommcts 'llus
may be done wrthout renroun" the
gang from the chassrs
Oscrllatron or low sensrtruty on fm
may be due to poor ground connm
trons from the gang to the r f shelf
When nlrgnrn, the f m band, oscrlla
trou may occur wrth ccrtarrr srrnrl
rencrators Charrgmg the value of tht
resrstor rn serres between the Dener
ator and the chassrs wrll prevent oscrl
latron \Vrth some generators mort
than -100 ohms are requrred, wrth
others less
ln some prclrmrnary sets a 200 M-1
rapatrtor was plated rn serres wrth
the short ware comtrter trrmmer ll
for any reason this trimmer requrrcs
1<-placement, removal of the capacrtor
rs suggested Thrs caprtrtor rs not
shown on the schematrt
ln some of the prelnnrnuy 14 tube
sets, Belden brard. was used to ground
the gauged capacrtor to the r f shelf
ln tertfurr lnstances too much solder
lloutd rnto the brard and as fr result
some Jourts brcalr loose or the sof
l> e c 0 m c s rnruoplronrc Thrs braid
should bc replaced urtlr soft copper
General Electrrc A51 A56
These models are the same as model
A54 shown on pager 7-4 to 76 of Rxde/J
Volume VII
General Electric H639ACDC
'lhe rf alrgnment rnstructrons of these
models found on page 11-80 of Rulers VaL
mme X I should read as follows Wrth gang
condenser plates completely meshed set
dral to the frtst mark at the left end of
scale 'lhen set dral to 1500 kc Apply
1500kc srgnal erther through a standard
IRE dummy to the antenna ter nnnal or
through an addrtronal loop connected to
the generator output whrch can be mag
netrcally coupled to the reoerver Beams
Scope Alrgn C2 and Cl at 1500 kc for mr\|
mum output Set dral to 580 ko and peak
C3 on 580 kc mlnle rockrng the gunz ron
denser Retrrm at 1500 kr
Thrs recerver rs the same electtrcally
as the YRB 60 2 appearrng on page 15 5
of Rulerr Volume XV but the cabrnet rs
GE YRB 92-2 and 81-3
These models are the same electrrcally
as the YRB 82 l appearrng on pager
1553 to 15 54 of Ruler; Volume XV
but they have drfferent cabmets
General Eleclnc 1.604
Thrs model rs the same as Model L600
rpperrrrng on pay/e 13 40 of Ilzdez s Vol
ume XIII
General Electric 202
Thrs recerver rs the same electrrcally as
the model 200 as shown on pager 15 54'
zo 15 56 In Ruler r Volume XV, except
that rr has a drfferent cabrnet
General Electrrc 219 220 221
A few cases of hum whrch cannot be
reduced rn the normal manner from these
models shown on page: 15 28 lo 1531 of
Rrders Volume XV may be corrected by
cathode degeneratron rn the output tube,
35L6GT/ G, cathode crrcurt Remove
R17 and C29 C from the crrcurr Thrs can
be done hy drsconnectmg one end of R17
General Elech-re 260
Thrs model appears on pages ro f to ro 1
of Rulers Volume YV] It has been found
that late productron ILCB tubes coded
H715 wrll oscrllate at another frequency rn
addrtron to the desrred frequency rausrng
unsatrsfuctoriy oporatron To remedy thrs
eondrtron the oscrllator grrd capacitor C17
should be changed from 100auf to 56p;>>f
Thrs model rs rllustratecl on page: 16 3
to 165 of Rule/I Volume XVI The
srrdix letters after 254 mdrcate only the
cabrnet srylrng All versrons are elec
Firestone 7402-4
Thrs model rs the same as model
S7426 6 shown on page 10 5 of Rldefr
Volume X
Thrs model rs the same as model
S7402 5 shown on page 13 38 uf Rxders
Volume XIII
Thrs model uses the Admrral record
changer model RC161 or RC16lA whrch
are to be found on Admrral RCD CH
pages 171 to 177 oi Volume XVII
Thrs model rs the same as Model S40
second rerrsron on pages 15437 Lo 1586
of Rzders Volume XV except for the fo]
lowrng changes C18 has been rh.rny_ed rn
ralue from 100aaf to 68aaf A 10-ohm ro
srslor (R3U) has been connected between
the center tap of oscrllator torl T10 and
ternnnal C R30 has been removed from
rt preuous posrtron between C16 and thc
_yunctron of C26 CSL (7C and swrtch SIF
C55 has been chan ed rn value from l00;4af
to 47,u,uf and rs nou connected to the top
of the 470-haf caprtrtor (( 54) 'llre roll
T17 rs tonnected dnectly across F54 wrth
one end gorng to ground l`he center tap
of thrs coll rs connefled to the rathodc
of the 6.18 tube 'lhe 00laf capacrtor
GJS tube drrectly to ground
The parts lrst should be changed to read
as follows
rdcw no temp coeff
Hallrcruhers SP 44 AND SX 42
These models appear on pages 17 1
to 17 5 and 17 6 to 17 16 respeclwely
ofR1de1*s Volume XVII When the
SX 42 rs used wrth the SP 44 Pans
daptor on the low frequency band t
appears to motor boat To correct
thrs condrtron do the followrng
The connectrng cable between the
SP 44 and the SX 42 rs shrelded and
the shreld rs connected to the SX 42
ground Drsconnect the shreld from
the SX 42 ground and place a 50 /lu
capacrtor between the shreld and the
SX 42 chasers Be sure that the
SX 42 chassrs rs well grounded A
shrelded antenna lead or a balanced
antenna, on the SX 42 may also help
The followrng nrodrfrcatrons should
be made on the SP 44 unrt A strrp
of bondrng brard % rnch wrde may
AKL58' AKL 59 diHEURrEURnf>> (C53) is connected from the plate of the
? John F. Rider

Page 2:

G';?'?| ETTMC 145 19 Generq]E1e?q-ig 160 h<;n.dN0_ Roy-ozs for C1 has been
r is mo e appears on pages -I3 Th~ c ange for an improved nntenna trimmer,
through 19.16 U/_ Riders vqztm mx, ,,,,mQ?,, '?'?'??' 0?P,??j;,2? ;jz,$;'eEUR,o{,?j; mo wif, used in me production. listed
'The B battery minus connection is made X1X_ The following chalgge in parts H56 RCY-052. This item allows knob adjust-
to the dummy lug 5 on the switch shown should be noted: ment of Lhe antenna trimmer for which a
gi Fig. hs X50 Change catalogue number RTO003 to read knob is available under Cat.No.RDK-158.
This model appears ln Riders Manual f0YIUEURl`~ ?f'?f"1E1e?'-"C 233' Kaiser Frazer
Volume XIX on pages 19-10 through 19-12, The mfdel f'l>P"L\l'? on woes 18-Q9
If it condition of parasitic oscillation GE 281 202 t<"f?'9/L 1'5"M_"/' ff'd"'5 -Ualtllfll 'VZIUIW
"mx strong Signals ana high volume Seb A . i li ll,lncriseswlic.etlie\'oll1me andluning
mug? chmmierized by whistles and dis_ Smce there me elemuwuy identical' tunuol slmlts appear too short lo ace
"med output is rammed on late p]_oduc_ (hex models have been addzd to the huinotlnlc the *shalt poi-ls 'nnd knobs, in
mm models in the gray Cabinet the follow hstmg for Mofiels 209, 203] and 205 whmh lloixlielil lip which is bent lo,>>\\`z1|-(1 in the
ing change will correct the condition: appears in Hldefs lolume XVIII, pages mf: Ogezimgboi the '"sU}""cm punel
Change the ghd return of the M am* 1349 and 1g_?0_ A A cr 'un_ o *cvs niet receiver instzi n,
mme, by moving bus wire lead on #2 The following ltems have been added to 0?hl;lig':n?'";i ?);'l;e"'?"`d by UWC"
lug of first if transformer to pin #5 of 'he PWS 'ISN 1 - A ? ' '
._ , , _ ._ 4 n instances where the hole for [llc
the r-l' amplifier (IT4), instead of pm #5 RAU-001 Cabinet-ixory (plastic), model ,,,:cei\.m. mound", bracket hw H L b
of the if tribe. This changes the bass of 201 mumwy locate; it is 055136 fm ff"
the i-l amplifier from zero veils to minus HAUo2a Cabinet~brown , model,.;\-e,. is poeillggcd R bg tm, fa, ,owafj
IA "?"i- 202 tlie'lr<>nt f the t ~
The following replacements should be The B?am-H'S?0lU9 Qablllff back lished control shziits to Ezhleotlirflgh
insde in the catalogue numbers: =1Sd%13;3~003 also applies to models 201 panel holes to their maximum extent, If
Delete the fouuwing parts: in Lhe l;'l~;nock out" hole Igor ?hel r?iounting
-cnt Nu. cnflrfln. Symbol Dcsoripzion General Electric 230, Kaiser-Frazer ?e"ta"' 'L 'S """"""(e]y P?5f"9"ed'
Ugnggg 1133.009 R; R??;s,,,, _ 330 This model appears on pages 18_% In case of pushbutton sticking, check for
'2?'f"';,,{,,,,,,>> Qhgough 18-28 of Rideris Volume XV111. Af??";?H;"?0b"""1g?;'Q "he b????"' 'X
nciwes noe-uw czA,B,c csWrwr_ _ Y en rough manual tuning action is ex- >> ~ ` . ' 1'"S'}' ?" ?Pe""'5*~
Eggggoxzic nerienceds if] is usually traced to insuiz binrigii tuning shaft will else cause the
Rcvllauls ncw-suis cu Emllgrrqiior .Eiee ficient spacing between the end of the Exir E ';?";] to ?f}"k ?,;, "ull l?_;`ei,""F 'U
if?,!"? ?""a?' center shaft of the turret assembly and binding rein]-i:;;s'th>:st\ini)nf? e;:a?;ater?'"
RHB-oo4 RHB~O09 Monogram Bin- the guide rod bracket near the tuning _- ?' ` "_ _ ?P "mg
lRl_L>>o29 RLLfo3-1 Ext:-Antenna Shaft' P"?d"c"i?" requirements can fc" uh?i'gt}?e;?;r;?erli; degdt chgclilliistallnlion
loop one or more as required) brag shim - ' .
' ` p|2?Q??'(???,'?;' 3 gm ._C,?'fv;??;? S??'"'?? '?nf;P'iEe"?e"? light switch respectively. If the receiver
"'\"'?'1 C=1>e=?' _- f h PP ? 8" lead their should gn to the instrument light
P1,?|,?(,\~.,,y) 0 t e center shaft of the turret in ad~ - - -- ~
, - - , _ _ control is connected to the ienition switch,
\\l>;,,g PMS# d'f??" 5? *he bm; Sh"" Washefs "lu the receiver will not operate though pilot`
' . ~ ro ieve inding and result in smoother tun- - -
lmseusl cn\,;5\,,|;,_.k. ~ V t. lamps will light.
umm "S gia?gifirgzvg ""= "C '?"~ Check the lerrdspenlm phrn cenneeelnrr.
?,h,,,?_?5w__ Though the plug pin receptacles in the
"Hmm gs?wshilw GE 230, 233 speaker lead Conner-for are emlnged in _
Llcevlazs an ca ,C;,,,,_ Model 230 appears in Rdiefs Volume such a manner to be polarized. it is often
0,005 111,600 XVIII on pages 18-26 through I8-28 and that the operator neglects to alien the
uoosgg gg ?;,\,'?c}{f,?A ltl.,de1 233 in the gems Volume, pages 13. receptacles with respect to the mnle plug
9.05 auf, 'sou 29 lhnmgh 18436. To the replacement parts llmfl _ef the Speaker, Fvrvinx Atuzether of
nmirosz C]';,'f Eiivfo, list for these two models add RMX-120, lhe incorrectly eli.\;I\D> _ _ A lnsnnnzenm C651 Cap Remains Spring ,md S?,ew_ cause the male pins to brerlk through into
agsuiesugnoggeiters wnh chassis number greener A quantity of these are used to service the thin walls of the non-conducting adja-
'=;l;>>Al;?n;>>;'lf3;?>>n is nranlmi ru the banner hr- the antenna r-f or oscillmtorconverter coil Wm hm? Ol 'h?,sl"e'*ke' Pl"g- "eS"]ll"2
For ,chassis numbers up to 55,000 the gud S*?@1<?("S~'=g=1i@S chef# 'hi "bs have '"????5?`$?"`l?? ?i?l`"i??,`f"????3;?'S'Yia??Eh
0&P?101W1'5 C10, 100 Wlfr and C12, 0005 Sen ro EF' e spnug 'spaced upon llampness as water drain-leaks upon the
f were not con td d- L h t e assem y to form s. bridge, Bearing .V _ ,
M, _ _ neC e pccor ing 0 t e u on the il nd h ld b th H v H, rcceixel components and wiring. results in
schematic diagram. Their B- connections L; in so "tho;h ti firm? Th' voltage breakdown at tube sockets (es
gvf?e grind; to th; :ft side of the switch shilid gtiferigidgerrztains :lie (xii ltlvithis neciiilly the 6V6 output tubes). or the
, oge er wit t e capacitors C2A and _ 1 _ _ shortinz of capacitors and resislors. The
C2B. This was done to nrevent a howling 'ts shfeid In heu ?f mb? _ , r>S f R2?30has been ldilgeli and the_circuit the COM Should be wel] Sea|Pd Mains;
over, t e wiring o e capacitors an or IS compee y connecting its wafer draining upon the receiver A
C215 has been changed. It was found that, free end to the secondary winding lead thorough check for probable leaks rind the
under certain circumstances, these eapec- swim; w Pin 5 Of the rwfifier, VS, so that necessary steps mken to. prevent their oc-
itors _added their charge to the peak of Cao, appears across the secondary of T4. mirrence should be taken at the time of
the line voltage, causing a. current surge Resistors R26 and R27 are connected in the initial radio receiver installation.
which was capable ol daxnaging any tube series with one another and across the A lower than normal battery voltalle can
Therefore, the negative sides of the two primary winding of T4. The junction of bv the cause of the radio to be weak or
capacitors (CQA and C2BQ were connected the resistors is grounded. foil to nn:-mte. The receiver will not
to the right side of Lheswitch SIB (B-line) To conform with these production function nroperly if the battery voltage
and the positive side of C2B was con- changes, Cat, Part URE073, R24 is dele>> mvnsurcs less than 5.8 volts.
nectedlto the terminal of the S?A switch ted from the replacement parts list and The Following changes in produc-
whlch is connected to the B+ line ol' the item URD-023, R26 and R27, 82 ohms* Lion wiring should be noted in the schema~
receiver. Now_ the charge can leak off % w,, carbon resistor is added. tic diagram:
after the set is disconnected from the Cat._No. RMX-123, pushbutton locking Capacitor`C28 has been changed to the
power supply, The following replacement screw is also added. This screw locks the left side of switch, Sl, at the junction of
has been ninrle in the pnrrs list: pughbnttgn deviee fm- auggmagk Station C27 and the switch connection. The ground
Connciringh pin hSJS-Kgs' ig] E351 loop tuning ,md has R kuurled head md thread. lead of C28 is connected to chassis ground.
?John F. Rider

Page 3:

_ Zenith 6D0 Series
Variations in the tube line-up of this
chassis 6C05 will be found; a single
chassis may contain octal, lock-in, and
miniature button tubes. lf an original
tube is replaced with an altegnate, the
socket must also be replaced. Alternates
that may be found are as follows:
Original Alternate
In case the oscillator shifts, replace the
220-ohm resistor(R5) with a 1000-ohm
' resistor, and if r.he,oscillatbr drops out at
the low end of the band, disconnect Rl
(10,000 ohms) from the negative return
and connect it to the cathode of the con-
verter. See the schematic on page 15-28
0 Riderlt Volume XV.
If audio oscillation occurs disconnect
the 00005 pf capacitor (C14) from the
negative return and connect it to the
cathode of the 35L6GT output tube Take
out C21 from the plate to the cathode of
the 35L6GT If oscillation occurs at 910
kc, change the capacitor C5 in the nega
uve return to the chassis from 0 05 pf to
0 1 pf In the event that there is hum,
oscillation, or poor sensitivity check for
grounded tuning capacitor frame This
can be corrected by inserting cork or rub
ber pad between rear capacitor frame and
chassis this pad should be cemented in
The letter V (SCOSV) indicates that
an aluminum chassis is used
If hum and mlcrophonics are found in
this chassis check for a grounded tuning
capacitor frame to the cabinet ventilator
plate Distortion and poor sensitivity
are usually caused by a short circrut be
tween turns on the loop Sometimes poor
sensitivity and failure to operate on the
low frequency end of the dial is due to
the oscillator oorl which should be re
placed If uncontrolled oscillations occur
solder a 470 000 ohm resistor across the
secondary of the lirst x f transformer
Zenith Chassis BCOI
If Butter is experienced when the set
is on fm it can be eliminated by in
stalling a 20 ,uf 150 volt capacitor (Part
No 22 1635) and two 0 25 watt resistors
one 2.2 megohms (Part No. 63-600) and
the other 1000 ohms (Part No. 63-583),
as shown in the accompanying partial
schematic. The complete schematic of
this receiver will be found on page 15-71,
72 of Rider? Volume XV.
A rushing noise when the volume con-
trol is turned to minimum is caused by a
poor connection from the grid element
to the grid cap of the 6S8GT discrimina-
tor tube. A hot iron and a little llux
on the grid cap will remove the high-
resistance solder joint.
lf the f-m oscillator drifts, check for
a red dot on the oscillator tuning slug
wire. If the wire is unmarked, replace
with one which has a red dot. ~
Zenith Chassis 5C01
A single chassis may contain octal,
lock in and miniature button tubes The
following alternates may be found
In the event that the oscillator shifts
replace the 220 ohm resistor R8 with
one of 1000 ohms If the oscillator drops
out at the low end of the band remove
resistor Rl (10000 ohms) from com
mon return and connect it to the cathode
of the converter The schematic of this
chassis will be found on page 15 8 o
Rfdem Volume XV
Montgomery Ward 64WG-|8073
These models are the same as model
64WG 1807A shown on page: 15 91 to
15 94 in Rsderir Volume XV except for
the following changes A 02 pf bypass
capacitor (C 35) has been connected be
tween ground and the screen grid of the
6V6GT' output tube resistor R 14 .re
sistor R 12 the red lead of the Zd if
transformer (T 3) resistor R 5 resistor
R 4 the red lead of the lst if ttansfor
mer (T 2) and resistor R 2 The 0004
uf capacitor (C 31) is now connected
from the plate lead of the 6V6GT output
tube to the mthode of this tube No
counterporse foil antenna is used
Fm. flutter may be
ehmmated in the Ze-
mth Chassis 8C01 if
the indicated changes
are made
Arvin 544 cmd 54411 (Noblitt-Sparks)
The followingchanges have been made
in the circuit appearing on page: 15-3
to 15-5 of Riderir Volume XV to reduce
low level hum and hum modulation
1. The capacity of the electrolytic
capacitor Al9l36 (C7) is changed
from 40-20W/_f, l50v, 20;t;tf, 25v, to
2, The rotor of the variable capacitor is
now connected to AVC instead of to
chassis. (This is the same circuit
that was used in sets built previous
to March 1946.) ` _
3. C11 0.1pif, 400v, capacitor from AVC
to chassis is deleted,
4. The bypass capacitor from B+ to
chassis is changed from C9, 0.05p.f,
400v, to C11, o_1,tf, 400v, to prevent
A libel' washer part 20198 Mr inch ID,
E6 inch OD L6 inch thick, is added
under the pointer to prevent the
pointer from touching the dial and
shortmg AVC to the chassis
The Heating ground wiring is changed
the }umper from the oscillator coil
to the #5 lug on the IZSK7 socket
is removed and replaced by a yumper
from the gound side of the volume
control to the a c switch lug
The top of the dial, scale backing
plate has been cut off even with the
top of the dial to allow the dial to
set in a more vertical position The
part number remains the same and
the old and new plates are interchange
The parts list for these models re
mains the same as that enumerated on
page 15 5 of Rid?f).\` Volume XV except
for* the changes noted
Part Na De_r:f1pnan
A19156 Capacitor electrolytic
A20198 Washer fiber
General Electric 202
This receiver is the same electrically as
the model 200 as shown on pager 15 54
I0 15 56 m Rule/1 Volume XV except
that tt has a diliferent cabinet
General Electric 219 220 221
A few cases of hum which cannot be
reduced in the normal manner from
these models shown on pager 15 28 lo
15 31 of R1de1': Volume XV may be
corrected by cathode degeneration in the
output tube 55fL6GT/G cathode crr
cult Remove R17 and C29 C from the
circuit This can be done by discorr
necting one end of R17
General Hednc A51 A56
These models are the same as model
A54 shown on pager 7 4 to 7 6 of
Ruled' Volume VII
(C)John F. Rider

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