General Electric Co. 260 Schematic

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Product Information:
Model:260
Manufacturer:General Electric Co. (Old RCA)

Schematics Content:

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Page 1:

PAGE 16-6 GE
MODEL 260
GENERAL ELECTRIC CO.
nan una me; =- _ . ?_.2.,~s
= = sis Z e =. ig:
5 ? ?s__???j???;s ri; 3 5 E?ag ;;;. E5 eggs 1 A ;5?i??_? _ '_ ggaaag; E: 2 =2-1 _>>???;=?>>???; 5;-_ 5
I || =,,:=~?,..._, _,gm >= = = mg .... ?<==,_,,_ ,- ,,, ,.~->>>>.=----||.1.=...g.~. s'-nv" "-,, ~r Q was
.? ,_ 5 gains B.. ;=.???g?????_ .w?e?<.-????????=== 5 * s?E;::===.=~5~ ?~. 2-122? .mv 3- . : : : 3 H wma ggi
Rider

Page 2:

CHANGES PAGE 20-5
GE zlol zlll 212 General Electric 417. 417A www( M _WMM
These models appear in Iildefs l'l>>Iurml Lhxgdil Zpgears e?nmp;ae5;h16`1i :~ 1?
X1/111, punts 18-Zlllhrough 18%. In the 162470, ,?,,je,_S" Vnffgfng Xp, hffjel _
schematic diagram C12 is shown as 22 ltltl ' '\,,/ \,,?'
. _ 417A appears on pages 17-27,28 ' ' -
This should be corrected to read 20 wif, through 1738 of Ridefs Volume XV" " ., ' me
C12 is listed correctly in the replacement ,rhM_ changes me in reference to the Wir; """"
,uns list us cut. No. Rcw_301e, 20 ,-nl: ,ng gf Plumb Preamp Hug RJP005 .F ,_
' ' inc nsls en w t `
H11-021-Insulator ~ Texbnlite no i11Sl\l~ 0-.fi identification igffiiiltliilsmiiiiiiilg I __
alle flge V0l"me Control ll""" in wiring guides, this notch must be dis
c assls regarded for indentification purposes to , J
Rll-022>>Insulator f Textolite (to msul- avoid confusion. While in some receiver ,,,,,,,,,,,,, l
atc the band switch from vlmssisl productions the position of this key t.. rs-
In the tube and trimmer location shown notch will differ from others, neverthe- il l
on page 18-25, the secondary tuning slug less, all receiver productions are wired
Of T5 *S """ll"b'EUR ""?"EURh Fl" *OP Of W the "me i" "SPEC" ?? the Wllfized fum tubes fm- 1111/fmt (3501 and C5I1_
can, while the primary tuning slug of T6 system of prong arrangement.
is available through the holes in the bot- ss GND (R) (R)
mm Of the ca" ' B* The pans llsl slloulll be clnlnged to mul
General Electric 219, 220, 221 -ls follows: ,
These models appear on pages 15-Z8 S bol Dlw., l;;"'l";f"l
ll-fnngh 15-81 of Riders vnzums xv. In _ - ?"` 1 - ?""' , . '"" '"
the Parts list, catalog number RLL-003 g|'lg\T? (C) HEATER Z?;'m'm"??"""'t2"""""" mo
should be identified as a replacement loop l-'SHT ?123,632 (l.00S;1f,600 mlctubulnr H02
assembly only for Models 219 and 220. _ ?"'1'?' ,
Catalog number RLL-025 should be added (C)"E/'TER CB' (130 ohimbulu 4203
as the loop assembly for Model 221, Ph P Pl RJPIUO he GF C3X,C33,C34 0~0luf-400 vol!-!ul>\\lar M
General Electric 250. 260 417?n?17,{egV,?ld if ,med ai c4l,c-no ?ll)>i2,c44 ssnhi,-, 1825, 2,1311 `
appears on pages 16-6 through 16-12 0/ is only necessary to follow the simple rerun-ls" 4010
Itidefs Volume XVI. The following should wiring rule as used in all receiver pro- C" 6?U"/?711 |0%1"\'<??'
be added to the parts list for both models: l1"<*fi0D Where the ?l\-\SfEUR\' of f?\1F P70559 Ll ;:::";,.,,,,,,, 52215
Hinge pin for cover, catalog number RMP. is first located within one-half the area Ls l2"Isl>>esl<?r,elemodynsmlc 9044
011. of the plug base as determined by the 3? ?13 ;2??00<>llm-120%-% W 450|
General Electric 321A l"'""gl""y _ "Fm" line' N=X=>>,1??="@ me ru' A lo lxiggsnglf i>: gli;
This "del is we we as M?d@1 321 lil' p??'$`? `??.?" of 'f{_`l"p1?? J-ffw1f.?l.nf'?'1?`2 lil, nn ZaT.'33<?"$?_"_;?f?&z?'?t""w 3233
k?f;,"Pl';EUR*l""S '?VP?V" 15-45 '""i15~" D! wa-lug in u clockwise direction as anfn "gg ?0?<-hm-:FWS w ow
E 3 0""e ' cated by the letter designations in the QBYRHY RM _,?Ygg,;"l;?1;,fi'_,_5?%6;?ww gg;
General Electric 356, 357, 358 ???':'P*"}Yl"i dlligam- The llfsflfefs A1 $2 22 U00 h _ fy)
These models appear on pages 1340 _ , em, in t e iagram, are eys to wir- - 0 m_+59?, w 4538
thmuah 18-44 of Ride-'s Volume XVIII. 'Hg P?"='~"f "_'?f?"?d l? "% the V""?"" Tm 0""`"' "`""E'm?" sm
The followlng changes should be made ln published receiver circuit diagrams.
the parts list. Under UCC-025, remove Magnavox AMp_lgl? per,->>-,ll
Symbols C43' C65' C70' Add (0 UCC4'2" This model is the same as Model AMP- U
2;\l1?lS C431 C65 070- 101A on pages 17-1 and 17-2 of Ridefx [@] .
neral Elgctfigg 355, 357 353; Volume XVII except for the following _ ,
316, 317, 315 I changes in paits values. '_
Models 356, 357, and 358 appear on Ref- 5 _
pages 18-40 through 18-44 of Ridea-'s Val. NO. Description Part. Na. 2 ' 0
ume XVIII. Models 376, 377, and 378 2-l Capacitor, paper, 0_1 pf " ,ag-_,
appear on pages 1936 through 19-41 0] 600v. 250l52G33
Rtde/11 Vfalame XIX. When an old type 2~2 Capacitor, paper, 0.1 ai, _ 5
construction GBE6 (date coded 8/17 or 600 v. 250152633 P 12-
belore) is replaced with a new type cone S Resistor, composition, ? 3 _ |
l\69EURSS&\'y t t e -rn oscillator choke 9 Resistor, composition, if
coll L8 be n ia*/n-turn mil (catalogue 100,000-1hms,10%,\/sw. 2300840.56 lg __
number RLF-012) instead of the 17-tum
will thai was used in early production Mug,-mvox Amp 111D AMP \11E l
l These models are the same as Model Anlrmu'l r1mn<>rlio11 clzarlg/las [nr Hoffman
_ AMP Ill, appearing ln Rldwkf Volume (':'/11 mul l`5Il_
G?"e'?l E'??'"? 375- 377' 37? XVIII, pages 18-4 tlnnugh 18-7 wept nn- )
rhese models appear on pages 1936 the following parts value charives' 7-7:57 /
through 19-41 of Riders Volume XIX. The - _ " _ Af- <-~/
' f'""' "h?"?l L8> in the "mod" ?i'?"l" ?f "5"N?f;,,__t1.?@if???lEURT?li0s r "3 155
the SBE6 oscillator converter tube, VZ, 400 V ` ' ' '"' = 5 "' _
lg" med "nd" ?'?l"l?S ""'"be' RLFW7' 22 Resistor, composition, 230084678 "1 I ue to a production change, this choke 22000 Olmm _*wg ,/ZW li -
now becomes RLF~0l2_ ` "' 7` _
Delete URD033, R12, Resistor-220 Hoiimcm C501 and C5ll. Chassis 108
clung, % ww 1;M\mu_ Add URD.037, R12_ These mmlcls lm, ,l , same as Model Fimnt rllnn;/cs for II0//mn1l(7/701 fmd(`51I.
REURS\St0Y*330 Ohms, W>>- 0H\'b0D~ Add A501, Ch. 1083, appearing on 71/nies 166
KCWSUOQ, C37, Capacitor-20.5 MJ. -:?%, lhfnngll 1510 of lame-'s Manual Volume KM" RP5701-
cwlnw. Delete UCW-2011, C37. Capacitor XV, nxt-npt that foul- 6K6 bennl-power tubes Th. od I _ _ _
-20 wi verflmw. Add Symbvl mlm- are used in push-pull parallel in thc lnxtput ,'S "' C "l'P""'* "',?h? M'"""""""!""
ber P4 10 RJP-003, Dclelc P3 and P4 tugs instead of no two pushq nvns "?'">">> IW W D/ ""fEUR~_M"""'?' "~'-
(Plug-prmilnplilier power plug) from RJP>> Thr change is indicated in the accompany "me XV' Th" "mdcl 'S hsled m 'he
004- Add RJP-005, PS, Yl\\Z-preamplifier ang lllnufunls. The alignment is sun the {,",?,"'@;'EUR?_ "S RP5?7T- I" S*'?""1 *W*
POWCY Pllllz. snmf- as given on page 15-53. 5 0 '
?John F. Rider

Page 3:

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 4:

PAGE 21-4 CHANGES
General Electric 143 General Electric 200 Serles
The connection between terminal number 4 These models appear on pages 18-1.9 _
of the 2nd of trsrrsforroor to the s,zoo_olrm through 18.20 oy Rider! Manual Volume M_IT,'f;'f;'(?fi';1l;l`;l_l;l;fe as Model AMP
resistor RZ is connected at the intersection XVIII. The following changes should be 101A which appears on pages 174 and N?
with the B+ line. Late production receivers added to the parts list: _ r
, , V . . of Rzclcfs Manual Volume XVII, except
incorporate the following changes ln order to RHM002 Chlir fl" m?"'1'>>U18 5Pe8kEl' fm. the follhwin chan e in B is V I e
paper capacitor has heen added in parallel with RHM-004 Clip, dugl scale mmmtms clip Qef- Pg" _ _
resistor R9, This capacitor has a reference f?l1 PIN-WC 9353199 111013215 Af- 50- D9S'*'HP'1?"
rrrrrrrlrrr of C16 and stoolr number Ucc_0-ts. RHM005 Clip. dial scale mountins clip 0 2?0129G4 Cavwlofr pf-vert 003 uf,
Capacitor cs has been Changed to s o.1_rf, for wood cabinet models 400 v~
200-volt capacitor, stock number UCC-050. _
The following parts lrsro been added to ,Mg 0, Rwe,.??,,mml Qhgume XV Mix Model 04WGj672 appears on woes 12-S1
provide replacement ofthe battery cover plate el 250 a em on a es 166 Umm A 162; 'Wi 19459 U! Rldefs Mdmwl Vvllww XII-
and assembly Dam; DJ. Ridgl; Mnnug "Volume XV? Add Models A and B are the same as that
ai. No. norrrrprrorr ' _ model which appears in Volume XII.
?HEUR'ggg EW" .?2iEUR'bPi:'? ?"1V _ R'EC'll03' 'lnlellllla loop Connector "HP l? Models C D and E are similar to Model
?_Yl_%}O&;J_ hw/sg, "h;_l3a_h?fr;l fiipuiivfilg the parts llsls or these molleli 04WG-672 with the following exceptions.
l\ll_o?v lrr;il?tIr, losolsfgfnihriluml "ash" General Electric 856 Model C emplws ll plugqll leslllml' Rls
RMC-037 Clip. battery slip h_ d 1 and RIZ. The values remain the same as
RM5'lB? 5P""f~ "A" \'="=fY =P""e- T ls' mo 9 appeals on pug" 1840 in the earlier models Model D ein lo a
_ _ _ through 18-44 of Ridefs Manual Volume _ _ ' . .. P y
The f01l0WlllE miscellaneous Diffi have XVIII R __ Rm __ b __ d the plug-ln resistor and, ln addltlon,| new
Been added. Most of these parts are required f ?zo in otha _ a?ao eel? C ings oscillator coil and 2 section dry eleo
because of the addition of brown and white lqlglq C; "gg hgh ?7 ? ms' A W' trolytio capacitor. In Model E the loop
cabinets. ` ?' ' ` ' ` ' antenna assembly has been redesigned.
. over, a eel/sr u ire _ _ odric _ _ _
hells l5""l"9?3k < l > s r Go 1192 521 92528
lli.Qi'i.i`2i 553552 i?Zl? 'flilr 'lEURf?`????.r> soo.o.o._ These models arollrosarrrr as Models 912-523, M?l?*'1?m?f!{ Wfnd U5WG-2745A
Chg; R/\C~0f'I __ _ __ ____ __ This model ls the same as Model 94\VG-
RAGM9 'hi:';;` ml" ? Y ( '?"'") l " 'l g2_324_ 92_525_ 92_526_ 2745A. To reduce regeneration in later pro-
RAC-n7c Corner, main body (white) rneluder duction receivers, the following changes were
roroorr ooh? os.. <..r...o .Maas B. r. Goodrich sa_1n9. 93-110, sa_111 },T;?"?' PM
RAOu__ _______;\g= _mm _"__ (bmW__) _"duh" 9__'l_l6l?se9r?ll;l2l_;ls are the same as Models 93-104, No. No. .gzimghon
RACM6 &,.,,,, imp cm, tbmwnl B _ cle mms shgdrzgf rsrsrrrrs roosrrror
_l?S;fl;l_I? K??b_=?:?;_? Zgnml knob . F. Goodrich 93 112. S3-l 13 tx-av asm; s,?;uo_olrm, o,s_w osrlsorr rorlssor.
, nr-lR>>oo4 no/rr, tooo room rlvst These models are thc same as Models 93-107 The remwf realms :he rf~>>
nl-rY_ooo Handle, roblaor loodlr and 93405 solorod olrole l.-s rrr doo more
r _ l:1_;E_E0 :Ili __ 9 end of cord to the sprlng. Cut off any
where the cord fastens to the prong in the been chalfsld Ei' h gg hs S 2264 73 excess Sffmllr
moldedplug. An appreciable increaseinduraf ohm Thgeall l?m*_h'2 0 ms l'? '
tion of operation from a fully charged bat- th gs" lib oysb e ileell cllllent ?l The C0lIlP011EURlJf Darts are the Same as
tery ooo be effected in the following rrrso_ weelim. Q' e '? _P S"."?@'%"'??"EUR 'md these lisled on page may of Riderls Val~
ner, realizing, however, that some degree of vMi0usm6;;7,;l"la long ln sam etweell "me XV, except f0l` 51059 listed lJEURl0W.
performance is sacrificed in regard to sen- ` _
sitivity and power output. Replace power- a' FQ hal; been lldgedlm Fatal' 1152! ` ia" D . .
supply filter resistor R17 (L500 Ohms) with e o eh sec , rear, wa er ead that Co. o. escrlplzan
a 4_70aohm_ Lwatty carbon resistmh This goes to t e phonograph receptacle. -15 B67204 0.20 /lf, 200 v, tubular
change should be made only when were 4. Capacitor C30 ls now connected to the C-16 D67104 0.10 Af, 400 v, tubular
is a demand for longer duration of opera- vallable reslsml' Rza' lllslelld ?l tc' O18 D67lo2 0001 *ll-' 400 Y' tubular
tion to one battery chm_ge_ ground. C-19 17Al23 1,0-12 api, trimmer.
? John F. Rider

Page 5:

/ _ \ `|` B BAND CNANGK SWIYCN
Loop
aka
P. 2 C| C40 I Ill I fx
? EUR g
GENERAL EI.
R-F AMPLIFIER
more - ' *TM '
our
'asv L "A ,Nov mac
5 36'?GT Q yawn wi L, G
"-N5 can
cc~nmo~s or mar
ALL usAsun?u:nvs r>>><:
>>?Asuas~c>>rv? mos ru anwuo
cumzn rosv an ALL Loc1AL wus s cnouuosn
| Soda! Voltage Diagram
sum / '
(C) John F. Rider, _

Page 6:

GE PAGE 16-7 8
MODEL 260
ll., can cz'
\' ' Y - - - " czs css can zzox W If N T
,M 2 2 use vm g iam
mx vmnumn mum* V, 'M f cuss Ano r>>2a_Lz '53
moo L5 ur ;_ gg G, 4 nz: my
__ _Y ;_ >> - | moo In mv
-I 2; ?gg;,; |520 rig ' ' wma ' w -~ W T an
_ CABLE
/' ? I WWW "_ \ 4 T" '?"' 3
_ ' -- W \ nvvem ' worn suwu
_ _W / , rz no w nuns L I C" _"Y I
Yuba and Trimmer Loeenlon

Page 7:

GE PAGE 16-9
GENERAL ELECTRIC CO.
MODEL 260
(C)John F. Rider

Page 8:

PAGE 164? GE

Page 9:

GE PAGE 16-11
GENERAL ELECTRIC CO. MODEL 260
_ ELECTRICAL CIRCUIT ALIGNMENT
I. EQUIPMENT REQUIRED.
1. Signal Generator with Audio Tone Modulation.
2. A-c output meter, 1 or Il? volts full scale, 1000 ohms/-
3. Insulated screwdriver.
2. ALIGNMENT PROCEDURE.
1. General.-The alignment procedure is given in table
form for convenience. Reference is riiade to Figures 3, 5, and 6
for the trimmer locations. The low side of the signal generator
should be connected to the chassis of the receiver for i-f
alignment; the high side- should be con.nected as indicated
in the Alignment Chart. A meter or some other suitable
indicating device must be connected to the output of the
receiver. Two methods for connecting an output meter are
given in later paragraphs. A
When aligning the receiver, the Volume Control on the
should be turned to its maximum position and the
receiver
TREBLE push button should be depressed. The output signal
of the signal generator should be kept as low as possible at
all times; the reading of a meter connected across the voice
coil leads of the receiver should be kept below li volt by
changing the signal generator output. If the signal level is too
high, the AVC becomes effective and alignment errors may
'I`he following paragraphs give greater details regarding the
connection of the output meter and the signal generator to
the receiver during alignment. _ _
2. Connecting the Output Meter.-In aligning the
receiver, some means for indicating differences in the output
voltage will be required. Either of the following methods is
satisfactory. The first requires more disassembly of the
receiver case than the second, but the second requires addi-
uolrliidlflird satisfactory method for indicating differ-
ences in output is to connect a rectifier-type a-c meter of
1 or 1 lf, volts full scale deflection across the speaker voice coil
terminals. To gain access to the speaker, remove the front
panel from the radio as previously described. Connect a lead
to the green lead that connects to the ungrounded side of
the speaker voice coil. Thread this lead through into the rear
compartment. The front panel is reinstalled in place so that the
stray capacities in the set will be the same as when the set is
operating normally. Connect the meter' between this lead
and ground. A convenient ground connection may be obtained
by removing the push-button band change switch escutcheon,
and connecting a clip lead to the exposed chassis.
STAGE GAINS AND VOLTAGE CHECKS
Stage gain measurements may be made with a vacuum
tube voltmeter to check circuit performance and to locate
stages which are not operating properly, The gain values
listed may have a tolerance of 20%.
1. R-F and I-F Stage Gains.
R-F amplifier grid (6) to
converter grid (6) _ ,. ,.8.0 at 1000 kc
R-F amplifier grid (6) to
converter grid (6). ..., 6.0 at 6100 and 9600 kc
R-F amplifier grid (6) to
converter grid (6) ..... 5.0 at 11.8, 15.2 and 17.8 mc
Converter grid (6) to lst
IF grid (6). ,,... ,.,.. 2 6 at 455 kc
Converter grid (6) to Ist
IF grid (6) .... ...,._. l 5 ut 1000 kc
Converter grid (6) to lst
IF grid (6). _ ........ 15 at 6100 ke, 9600 kc, 11.8 mc,
15.2 mc, and 17.8 mc
lst IF rid (6) to 2nd IF _
grid ~%6) ....,......... 69 at 455 kc
2nd IF gr-ia (5) to diode
plates ,,,_.. ......... 3 .9 at 455 kc
2. Audio Gain.
The power output across the speaker voice coil should be
approximately 50 milliwatts with u 400 cps audio signal of
0.07 volts applied across the volume control, R10 (volume
control maximum-TREBLE push button depressed).
3. Oscillator Grid Bias.
The d-c voltage developed across the oscillator grid leak
(R2) averages 6.5 volts at 1000 kc,
Methorl 2.--The following is an alternate- method which
eliminates the necessity of removing the front panel of the set,
but which requires additional test equipment. Make an
indicating device by connecting a 4- to 6-inch diametu
magnetic speaker or the high-impedance leads from the
output transformer of a good p~m dynamic speaker to the
terminals of a rectif|er~type microammeter with a full scale
deflection of 100 microamperes or less. For convenience, the
meter and speaker may be mounted in a small box in such a
way that the meter will be visible when the speaker is placed
in front of the speaker on the receiver being aligned,
To use this device, place its speaker in front of and about
an inch away from the speaker of the receiver being aligned.
The meter will then deliect in proportion to the intensity of
the sound produoed by the speaker, and therefore may be
used as an output meter. The meter must not be moved
during alignment,
3. Connecting the Signal Generator.-For aligning the
i-f transformers, the output of the signal generator should be
coupled through a 0.05 mf. capacitor to the grid (pin 6) of the
1LC6 oscillator-converter tube. This may be accomplished
easily by connecting the capacitor to the stator of C2-A, the
middle section of the tuning gang, as this stator is connected
to the converter grid through a blocking condenser. The low
side of the signal generator output should be connected to the
chassis ground to complete the circuit.
For aligning the oscillator, r-f, and loop circuits, the r-f
signal should be inductively coupled by means of a three- or
four-turn, 6-inch diameter, loop of hell wire across the signal |
generator output terminals. The loop should be located about
one foot from the radio cover, with cover open for broadcast
alignment, and about one foot away from the external loop
when making the shortwave band alignment. To prevent
ponible errors in peak.readings, the position of the loop with
respect to the receiver should not be changed during any one
set of adjustments.
4. Alignment Suggestions.-The dial pointer should fall
under the extreme left endmark on the dial scale when the
gang condenser is fully closed. If necessary, move the dial
pointer along the dial drive cord until such registration is
To gain accesl to the shortwave oscillator tuning slugs,
L13 through L17, remove the snap cover from the bottom
of the receiver. The short-wave antenna and converter trim-
mere are accessible when the push-button band-change switch
elcutcheon (right-hand side) is removed. When aligning the
trimmers on the gang condenser (for broadcast band align-
ment), close the cabinet back cover and make the adjustments
through the snap button openings in the back cover.
The oscillator operates on the high frequency side of the
signal on all bands. With this method of operation, and with
the dial set at an alignment point, the image response should
be heard when the signal generator is tuned to a frequency
910 kc.higher than the alignment frequency.
Fig. 5. IF and Anlennu Trlmmor Lumlon
(C)John F. Rider

Page 10:

PAGE 16-12 GE
MODEL 260 GENERAL ELECTRIC CO.
' Allcmenr cunt V
Depnn Treble Push Ballon
Tum Volume Control fo Maximum
Sig. Gen. Connect Signal Depress Dial Scale ,
step Setting Generator to Push Button Setting Adjust
_T_ "sic Stgor of c-za in mae; with .os mf Standard- lseldi-7?o kd `;i;? <~rz;?i;;?;;;T_
2 455 kc srmf df c-za iii maui with .os mf Standard Below sso kc lst i-f (Tl) ?rim;?T<;iuux.h
3 1500 ke luduuuvely coupled Standard isoo kc "oss, cas, and ons f;Tn;;
in sequence given
4 580 kc Inductively coupled Standard 580 kc ' L4 and L3 _`_*`_
6' 6.1 mc Inductively coupled 49 M 6.1 mc L13 for max,
7 6,1 mc Induetively coupled 49 M 6.1 mc ' L8 and CET;
8 9.6 mc Inductively coupled 31 M 9.6 me L14 for max. *_`_A<__
9 9~6 mfr lnd\=??iv?\y wuvled 31 M 9.6 me ' L9 a;?;??;;z;*____
10 ll.s me Iuduurively coupled 25 lvl 11,8 me 'L15 ?;;;_ _`_>>_w
11 11.8 mc Inductively coupled 25 M 11.8 mc ' L1;;d_(;1lAtT>c power outlet and depressing the cover.
CHARGE push button. Frequent check should be made of 4. Unplug old Battery if present, and replace with new
the charge indicator and when both indicator balls are visible, battery.
the battery is adequately charged. Charging the battery after 5. Place battery on charge, if necessary, as described in a
all indicator balls are visible will not harm the battery except previous paragraph, until both indicators are showing in the
that it will evaporate the water faster. A completely dis- opening in the case cover. `
charged battery will be restored usually within 20 to 30 hours. '
When operating the receiver from the a-c house current, V
the battery Boats of is being charged at a slow i-see. Thus, ,f
if you wish to operate the receiver at the same time that you
are charging even a fully discharged battery, plug the power
cord in the a-c receptacle and depress the ON push button.
Prolonged operation in this manner usually will cause the
battery potential to stabilize at some voltage determined by
the line voltage and the characteristics of the charging circuit
components. The degree of charge obtainable with this
method of operation likewise is dependent on the line voltage
and the characteristics of the charging circuit components,
(C)John F. Rider

Page 11:

GE PAGE 16-13
GENERAL ELECTRIC CO.
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(C).Tohn F. Rider

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