Motorola 17K1E, 17K2E, 17K1BE, 17K2BE Service Manual

C -

Scanned by mbear2k - Jan 2012

SERVICE MANUAL

17K1E 17K2E

GENERAL INFORMATION

RE CE IVE R MODEL, B REA KD OW N CH ART

M odel

17K1E

17K1BE C on sole ,

17K2E C on sole ,

17K2BE

CHASSIS - T ele vis ion c h as sis TS -17 2 is b uilt a rou nd a 17"

recta ng ular p ictur e tube. The p ic tur e, soun d,
and scann ing c irc u its , togethe r w ith a co nv en 
tion al tr an sfo rm e r type " B " su pply, are co n 
tained on a sin gle c ha s sis .

TU NING R ANG E - Chan nels 2 through 13

Chan nels 7, 8, 9 & 10

ANT EN NA - T A -6 " B ilt-In -T en n a ". P ro vision s for con ne c

AN TEN NA IM PED AN CE - 300 oh ms

Type of R e ce ive r

Co ns ole,

C on sole ,

tion of an ex tern al antenna.

re d -b rn m aho gany
lim ed oak
re d -b rn m aho gany
lim e d oak

11, 12 & 13IF FR EQ - C han nels 2, 3, 4, 5, 6,

Soun d: 21 .9 m e

P ictu re : 26 .4 m e

Sound: 27 .3 m e

P ictu re : 22. 8 me

CHASSIS

TS-172

MODELS

I7K1E

17K1BE

I7K2E

17K2BE

POW E R S U PP LY - 117 v o lt s, 60 c y cle A C cu rr en t o nly

POWE R CO NSU MPTION - 205 w atts

AUDIO O UT PU T - 4 w atts

CHASSIS TU BE CO M P LE M EN T -

Ref.
No.

Tube

i

6CB6

V -l
V -2 12AT 7
V -3

6AU 6 /6 AG 5

V -4

6AU 6 /6 AG 5 2nd IF A m p lif ie r

V - 5

6 AG 5

V -6

6AL 5 o r
1N60 xtal

V -7

6AH6 or
6C B 6/6B C 5 Vide o A m p lifier

V -8

6AU 6 /6A G 5
6AL5

V -9
V -1 0

6J 5/G T

V - ll

6V 6/G T

V -l 2

V -l 3

V -14

V -1 5

V -16
V -1 7

V -18
V-1 9

V -20

V-21 5U4G

6SN7GT 1st & 2nd C lip p ers

12AU7 or
6SN7GT
6W 6GT or
6 AS 5
6AL 5 o r
6H6
6SN7GT
6B Q6G T

6W 4GT
1B 3G T
17BP4 or
17AP4

Fun ction

RF A m p lifier
M ix er-O sc illa to r
1st IF A m p lifier

3rd IF A m p lifie r .

Vid eo D ete ctor

Au dio D r iv e r-L i m ite r
Ra tio D ete cto r
Au dio A m p lifie r
Au dio Output

V er tic al S weep G ene rato r

V er tic al Sweep Output

Ph ase D etecto r
H orizo nta l O scilla tor
H orizo nta l Output & High

Vo lta ge G en era to r
Dam ping Diode
High Volta ge R e ctifie r

Pic tur e T ube : r ectangular
Low Vo lta ge R e cti fier

Op eration of this r ec e iv e r, o utside its cab in et o r w ith
co v e rs rem ov ed , in vo lv es a sh ock h aza rd fr om the p ow ef
su pp lie s. No w ork should be attem pted on this re ce iv e r b y

Ex trem e ca re m ust be u sed in handling the pictu re tube*
The tube is h ighly eva cua te d and, due to its la rge si ze , is
sub jecte d to a co n sid era b le atm o sp he ric pr es su r e. The
handle r should w ear safety go ggle s and gloves fo r p r ot e c
tion . A void nick in g o r sc ratc hin g the gla ss by rough con tact
with other o b jec ts.

4545 AUGUSTA BOULEVARD

PART NO. 54P70217 4

HIGH VOLTAGE WARNING

anyone not th orou ghly fa m ilia r with the pre cau tion s n e c es
sa ry when workin g on high volta ge equ ip m ent.

CATHODE RAY PICTURE TUBE HANDLING PRECAUTIONS

B efo re re m ov in g g la ss tub es, dis ch arg e the c ap acity
fo rm ed by the inn er and o uter aquadag coating s on the tube
by sh orting the anode co nta ct on the sid e of the tube to the
outer su rfac e with a w e ll in sulated p iece of w ire .

CHICAGO 51, ILLINOIS

Price 15 Cents

PRINTED IN U. S. A.

INSTALLATION AND OPERATING INSTRUCTIONS

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RE C EIV ER LO CAT IO NS

The re c eiv e r m ay be pla ced anywhe re in the ro om , but

for greate st sa tisfa ctio n it should be loc ate d.

1. Aw ay fro m any brigh t lig ht that m ay fa ll d ire ctly on the
sc re en o r be re flec ted fr om it; this in clud es windows and
la m ps. Som e illu m ina tion in the r oo m , off to one side , is
d es ir a ble , h ow e ver , to prev ent ey e -st ra in .

to re ce iv e stations on c han nels of w id ely sep ara te d frequ e n
ci es .

Loca tion of the antenna sh ould be decid ed fro m the stan d
point of m ax im u m signa l p ic k-u p . In g en era l, the antenna
should be broa ds id e to the tra nsm ittin g antenna and sh ou ld
be as high as p o ssible . If a re fle c to r is u sed, the antenna
should be orien ted so that the d riv e r ele m en t is c lo se st to
the station and the r e fle cto r fa rthe st away.

2. To pro vide co m fo rta ble v iewing and ea se of ope ratio n.

3. At lea st on e -in ch away fr om a w all to allow fo r cab in et

ventilation . This is v er y im p ortan t.

ANT ENN AS

The ch oic e of tele vision antenna d epends en tire ly on the
loca tion of the r ece iv er with re sp e ct to all te lev isio n station
tra nsm itting antennas in the a rea . M ax im um p ick -u p is o b 
tained when the re ceiv in g antenna is dir ec tly in line of sight
with the tran sm ittin g antenna.

"B ilt-In -T enn a ". A ll r ec e iv er s u sin g th eT S -1 72 se rie s
tele vis io n ch a ss is are equipped with the M oto rola "B ilt-I n -
Te nn a", m ounted in side the ca bine t, for use in good sig nal
ar ea s.

When this antenna is used , the follow in g prec aution s

sh ould be ob se rv ed fo r b es t r ece ptio n:

1. In o rd er to get m axim um p erfo rm a n ce and s at isfa cto ry
pictu res fro m the "B ilt-I n -T en n a ", am ple signa ls fro m the
tele vis ion sta tion m ust be pre sen t at the lo ca tion of the r e 
ce iv e rs . N orm ally, the stren gth o f the sig na ls w ill v ary
th rou ghout the r oom in wh ich the re ce iv e r is lo cat ed . For
this r eas on , b etter p ictu res w ill be obtained if the r ec e ive r
is tried in all p o ssib le lo cations in the view in g ro om and is
then p la ced w here the c lear est p ictu res are re ce ive d fr om
all stations. Av oid larg e m eta llic o bje ct s, such as r ad ia
to rs , m etal p ane ls , e tc.

2. La m ps , va se s and m e tallic o b jec ts, wh en place d on top
of the r ece iv e r, m ay a ffe ct the e fficien cy of the "B ilt-I n -
T en na".

In door An ten na. If add itiona l pick -up is n e ce ssa r y, an
in do or antenna, p la ced on or n ear the re c eiv e r , m ay be
used . Th e antenna sh ould be rota ted and the a rm s sh ou ld
be ad ju sted fo r the be st sign al, with no g hosts o r r e fl e c 
tio ns . N orm ally , the ar m s should be ex ten ded on the low
chan nels (2 -6 ) and te les cop e d on the high ch annels (7-13).

Lo catin g the antenna and lea d -in as fa r aw ay as p os sible
fro m highw ay s, h ospita ls, d o ct or s' o ff ice s , e le c trica l m a 
chin er y, e tc. , w ill help to re du ce no ise p ick -u p fr om such
so u rc es . Als o , it is d es ira ble to k eep the an tenna at lea st
six fe et away fr om other anten nas, m etal ro o fs , gu tters , or
other m e ta l ob jec ts to preve nt unwanted re flec tions and
shield in g.

Le ad -In. Since the T S -172 c ha ss is is desig ned fo r 300
ohm input, the stan dard 300 oh m tw in lead lin e sho uld be
used for co nn ecting the outsid e antenna to the r e ce iv e r.
Tw isting the lin e one co m p lete turn per foo t o f running length
helps to redu ce n oise pic k-u p on the line . T he le ad-in
should be su ppo rte d on sta n d-o ff in su la tor s and k ept tight
enou gh to prev ent m ech an ica l da ma ge th rou gh swa yin g.
Av oid running the lea d -in clos e to me tal gutte rs, ir on
standpipe s, e tc.

In v er y stron g sig nal a rea s, or w here se v er e lo ca l in 
ter fer en c e is enc oun tere d, 300 oh m s hield ed twin lea d is
reco m m en de d. The shield bra id sh ou ld be gro unde d.

An ap prov ed lig htn ing a r re st or shou ld be use d.

RE CE IVE R A NT EN NA CO NNE CTION

The antenna le ad -in to the te lev isio n r ec eiver is co n 
necte d to the two sc re w s of the term ina l str ip on the r ea r
of the cab in et. D isco nn ect the "B ilt-I n -T en n a " lead s fro m
the ter m ina l s tr ip b ef or e atta ch ing an ex tern al antenna lead -
in. So m e tim es , re ve rsin g the le ad -in conn ectio ns at the r e 
ce iv er m ay im p rov e pictu re qu ality and o v er all p erfo rm an c e.

OP ER AT IN G CO NT RO LS

Th ere are two dual co n tro ls, con sis ting o f a sm all and
a la rge knob eac h, on the fr ont panel of the r e ce iv e r. See
Figu re 1 fo r fron t pan el co n trol fu nctio ns.

Outdo or Antenna. The M oto rola "B ilt -In -T e n na " or the

in doo r type antenna w ill g ive sa tis facto ry re cep tio n in stro ng

signa l a re as; but, if the r e ce iv er is loca ted in a frin ge or

weak sign al a rea , an o utdoor antenna is re com m en d ed.

In a rea s fre e of ob stru ction s and r efle ct ion s , w ithin r e a 
sona ble pro xim ity to te lev isio n t ra ns m itte rs, a dipo le and
re fle cto r w ill p rove s at isfa cto ry . S ince such an antenna has

a r ela tive ly sm all band c ov e ra ge , a sp e cial antenna c ov erin g

all tw elve t elevisio n chan nels sh ould be used if it is d esir ed

The re ce iv e r is c om p le tely adjusted at the fa cto ry , so

no rm a lly none oth er than the fron t pa nel co nt rol op erating

in stru ction s need be follo w ed inp utting the r ec eive r in o p e r
ation . H ow ev er, to provid e fo r any m isad ju stm en t of the

2

FIGURE I. OPERATING CONTROLS

SERVICE ADJUSTMENTS

se rv ic e c on tr ols , due to ha ndlin g, the follow in g ins truc tio ns
are in o rd e r. See F igu re 2 for locatio n o f the s er v ice ad 

ju stm en t co n tro ls.

FIGURE 2. SERVICE ADJUSTMENT CONTROLS

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FOCU S C ON TR OL

The FO CUS co nt ro l shou ld be ad ju ste d until the fin e h o r 
iz onta l lin e stru ctu re o f the r as te r is cle a rly v is ible ov er
the p icture ar ea . The co n tro l sh ou ld b e turned through the
co r r ec t point s ev er a l tim e s so that optim um foc us is o b 
ta ined .

CEN TER ING

By m ea ns of a le ve r ex ten din g fro m the fo cu s c oi l, thru
the rea r s cr ee n , the fo cu s c oi l can be s hifte d to ce nte r the
pictu re in its m ask .

VE R TIC A L SIZE AND VE R TIC A L L IN EA RIT Y

Ad just the V E RT IC AL SIZE c on trol until the pictu re fills

the m ask v e rtic a lly . Adju st the V ER T ICA L L INE AR IT Y
co ntrol fo r b es t o ve ra ll v er tic al line ar ity . Ad ju stm ent of
the V E RT IC AL SIZE c on trol w ill re qu ir e a re adju stm en t of
the V E RT ICA L LIN EA R IT Y co n trola n d p o ss ib ly of the V E R 
TIC AL HO LD c on tro l. C enter p ic tu re with the c entering
le v er on the fo cu s c oil.

HO RIZ ON TA L SIZE

Ad ju st the HO RIZO N TAL SIZE le ve r until the p icture
fills the m ask h oriz on tally . Ce nter pict ure with the c en 
terin g le v e r.

HO RIZ ON TA L O S CILL AT OR AD JUST ME NT

The HO RIZO N TAL HO LD co n tro l sh ould have a sync

range o f ap pro xim a tely 180 d e gr ee s. If the c on tr ol is too
cr itica l, ad ju st as fo llow s:

1. Short out H OR IZ ON TA L O SC ILL AT O R c o il L -2 3 . Th is

m a yb e done w ith the ch a ssis in the ca binet by sh orting pins

3 & 8 o f the te st sock et on ch as sis re ar .

2. W ith the ce nterin g le ve r, m o ve the p ictur e to the le ft so
that the r igh t edge o f the ras ter can be s een . Ad ju st the
HO RIZ ON TA L HOLD co ntro l to about the m idd le o f its ran ge

andnote the w idth o f the blanking pu lse. (Th e bla nking p ulse
app ear s as a g ray bar at the right edge of the pictur e).

3. R em ove sh ort fr om H O RIZ ON TA L O S CIL LA T OR c o il.

4. A dju st H OR IZO NT AL O SC ILL AT O R co i l until the sam e
amoun t o f blanking pu lse ca n be seen as w as noted in step 2.

VE R TIC A L HO LD AD JU STMENT

Ad just the V ER T IC AL H OLD co n tro l for the cen ter o f

the v er tic al syn c lo ck -in ran ge.

BRIGHTNESS

Ad ju st the BRIGHT NESS con tr ol, in co m bina tion w ith
the C ON TR AST c on tr ol fo r the m o st p le asin g p ictu re . Keep
the b rillia n ce sligh tly be lo w m ax im u m , h ow e ve r, in o rd er
to pr ote ct the flu or es cen t s cr ee n of the p ict ure tube and to
prev ent po or p icture d etail.

ADJUSTME NT O F ION T R AP

Under c ond itio ns o f rough shipm en t, it is po ss ible for
the ion tra p to be co m e m isa lig ne d. T o preven t s er io u s d am 
age to the p ic ture tube , the follow in g m eth od o f adjustm en t

sh ould be u sed . See F igu re 3.

The m agnet should be p la ced on the n eck of the tube in
the d ire ctio n indica te d by the m ark ing on the m agnet (u su 
ally an a rrow wh ich points tow ard the p ictu re tube scr ee n)

so that the s tron g er m agn et of the dou ble mag net type or the
only m agn et in the sin gle m agnet type is pos ition ed o ver the
in tern al po le p ie ces w hich are m oun ted on the gun stru ctu re .
Ad ju st the BRIGH TNESS co nt rol for low in te nsity and m ov e
the m agn et a sh ort d istan ce forw ard and ba ckw ard at the

sam e tim e rotating it to obtain the br ig ht est ra st er . If, in
obtaining the br ig ht est r a st er , the ion tra p m agnet has to be
m oved m ore than 1/4 " fr o m the gun pole p ie ce s the m agnet
is p rob ab ly wea k and a new m agn et sh ou ld be tried . N ev er
co r r ec t for a shadow ed ra st er with the io n trap magnet if

3

FIGURE 3. PICTURE TUBE ADJUSTMENT LOCATIONS

Scanned by mbear2k - Jan 2012

su ch c o rr ec tio n r esu lts in d ecr ea s ed b righ tness . The ion

trap ma gnet m ust a lw ays be ad ju ste d fo r m axim u m br ig h t
nes s and if shad ows o ccu r at this settin g they should be
elim in ated by a djusting the fo cu s and d efle ctio n c o ils as e x 
plained un der " F oc us C oil and D efle ction Y oke A djus tm en t1'.

CAU TION : Ke ep BR IGH TNESS co ntro l at low intensity

until ion tra p is p ro p er ly set.

A m irr or pla ced in fro nt of the r ec ei ve r w ill aid in m a k

ing this ad jus tm en t.

DE FL EC TIO N Y OKE A DJU STM EN T

If the de fle ctio n yo ke sh ifts, the pictu re w ill be tilted .
To c orr e ct , loo se n the th um b screw on top of the de flec tion
yoke and rota te y oke until the picture is straig ht. B e for e
tightening the thum bscrew , m ake cer tain that the de flectio n
yoke is as far for w ar d as po ss ible .

If the yoke support and the pictu re tube have sh ifted in
tran sit, or if fo r any rea son the se p arts h ave b een rem ov ed
and r ep la ce d , it is be st to do a c om p lete jo b of r ep o sit ion 
ing. See F igu re 3. The sta rtin g p oint is the p ositio n o f the
pictu re tube. It sh ould be ad ju ste d s o that the dista nce fro m
the c ent er o f the tube fac e to the front edge o f the c h as sis is
1-1/16 ". The cla m p on the fro nt of the tube shou ld then be
tigh ten ed. T he pictu re tube r ea r su ppo rt bra ck et p o sitio n 
ing adju stm en t s cr ew s shou ld be lo os e enough to pe rm it
slid in g the b rac ket forw ard until the r ubb er cu shion fit s
sn ugly up a gainst the fla re of the tube. L o osen the yok e ad 
ju stm ent th um bscr ew and push the yoke up against the fla re

of the tube. C AU TION : Do not us e fo r ce in slid in g the
bra ck et up. If to m uch fo rc e is u sed , a stra in w ill be
plac ed on the neck of the tube w hen the supp ort b rac ke t
pos ition ing ad justm en t scr ew s a re tighten ed. A lso the yok e
m ay be f or ce d out of p os itio n . The op ening in the yok e
sh ould be co n ce nt ric with the ne ck of the tube.

FOCU S C OIL

The fo cu s c o il should be pos ition ed so that it is sp ace d
l /4 " f ro m the d efle ction yok e w hen p ar alle l with the y oke.
The open ing in the fo cu s c oi l should be c on ce n tric w ith the
ne ck of the tube. The sp acin g shou ld b e adjusted b efo re the
fr on t of the pict ure tube is cla m ped down b eca us e it is n e ce s 
sa ry to re m ov e the tube to chan ge the po sition of the fo cu s
co il. Its position is ch anged by c ho ice of lo ca tion of the c o il
moun ting studs in the sca llop ed h ole s on the top and b ottom
of the co il mou nting br ack et . The opening in the fo cu s c oil
can be m ade co n cen tric w ith the n eck of the tube b y lo o sen 
ing the nuts on the studs w hich su ppo rt the focu s co il b r a ck 
et and turning the studs with a s cr ew d riv er in the slo ts p r o 
vided . T he studs are e c ce n tric and m ove the c o il both v e r 
tica lly and h oriz on tally . Th ey should be u sed only to cen ter

the n eck of the tube in the op en in g o f the co il.

TES T SOCK ET

A test so ck et is pr ovid ed on the r ea r of the c h as sis
wh ich allo ws adjustm ent of the hor iz on tal o sc illa to r and
che ckin g of sen sitivity w ithout rem ov ing c ha s sis fr om c a b i
net. See F igu re 2 for s ock et con n ectio ns .

g e n e r a l

The ch a ss is sh ou ld b e m ounted on angle iron b rack ets
(M o tor ola P art N um ber 7X700210) s o that all con ne ction s
and adju stm ents m ay be m ade e as ily .

4

ALIGNMENT

Since the p ow er co rd cir cu it is bro ken by the in ter lock
when the cab in et ba ck is rem ov ed , it w ill be n ec e ss ar y to
obtain an e xtra po we r c or d with the fem ale in ter lock r e ce p 
tacle in o rd er to m ake a po we r con n ectio n to the r ec e iv er .
O rder M ot oro la P a rt No. 3 0B47 0756.

ORDER OF ALIGNMEN T

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A c om p lete r ece iv er alig nm ent ca n be m ost con ven iently

pe rfo rm e d in the follow ing o rd e r:

1. A udio T ak e-O ff & R atio D etecto r

2. 4. 5 Me T rap

3. IF C oils & M ixer T r an s for m e r

4. O sc & R F Sec tion s

AUDIO T A K E -O F F & RA TIO DE T EC TO R A LIGN ME NT

Equ ipm ent Re qu ire d:

AM Signal G ene rato r: A c cu ra tely ca lib ra ted at 4. 5 me

(O ption al) Ad ju stable output

DC M ete r: Low ra nge e le ct ro nic v oltm ete r

R efer to F igu re 4 fo r loca tion of a djustm en ts.

1. If p oss ible it is d es ir ab le to align the au dio se ctio n from
an actu al station sign al, sin ce the 4. 5 m e alignm en t fr e 
que ncy w ill be ex ac t. The fine tuning t rim m er should be
tu rn ed of the station sligh tly , to p reve nt o ver lo ad ing the
ratio de tec tor.

2. If a signal ge ne rato r is used , tune it a cc ur ate ly to 4. 5
me and ad just the output to a pp roxim ate ly 10 ,0 00 m ic ro 
vo lts. C onn ect the high s id e of the sign al g en era tor through
a 1000 m m f ca pa cito r to the grid (pin 1) of the v ide o a m p li
fier tube V -7 , and the low sid e to ch a ss is. The follow ing
app lie s w hether the. station sign al o r signal gen era tor is
used .

3. F ro m either side of c ap a cito r C -5 2 , con ne ct an e le c 
tron ic vo ltm ete r to c ha ss is de cou pled thru 10K oh m s.

4. Set the co ntr ast co ntro l for m a xim um gain (fully c lo c k 

w ise ).

5. P eak L -20 for m axim um rea ding on m ete r.

6. Pea k T -3 p rim a ry (top c o re ) f or m axim um reading on

m ete r.

7. M ove the m ete r and deco up lin g r es is to r fro m C -5 2 to

ju nctio n of R -4 1 and lead to volu m e co nt rol.

8. Adjust T -3 sec on dary (botto m c o re ) fo r ze ro re sp on se
on the lo we st sc ale of the m e ter . T his c orr es p on d s to the
cro s s -o v e r point on the FM d e tect or c ur ve . If d e sir ed , the
sy m m e try of the cu rve m ay be ch eck ed by tuning the g e n er 
ator ± 25 kc fr om 4. 5 m e and noting the v oltage produced,
re ve rsin g the m e ter co nn ectio ns as n e ce ss a ry . F o r p ro per
balan ce of the r atio d e tect or sys tem , the v oltage in e ach d i
rec tion shou ld be ap pro xim a tely equa l. If not, c he ck the
tuning of L -2 0 and the pr im a ry & se con d ar y o f T -3, the
ratio d ete cto r. If n e ce ss ar y, re pla ce the ratio de tec tor tube
V -9 (6 A L 5). The g en era tor m ay be c alib ra ted by tuning the
sec on da ry of T -3 to ze r o on a station signal and tuning the
gen era tor to the sam e z ero r esp o n se, noting w heth er it in 
dica tes 4. 5 m e.

NO TE: As the ad ju stm e nts are b rough t to r eso n an ce , it is
advisab le to re du ce the sign al g en era tor output to preven t
ove rloa din g.

With a 1 0,00 0 m ic ro v olt sign al fed into the g rid of the
vide o am plifier tube, and the con tra st c on tr ol turned fu lly
clo ck w is e, the voltag e rea d fr om one side o f ca p ac itor C -5 2
to ch a ssis should be gre ater than 5. 0V .

NO. TYPE

V-l

6C86
I2AT7

V-2
V-3

6AU6/6AG5

V-4

6AU6/6AG5

V 5

6AG5
6AL5 VIDEO DET.

V 6
V-7

6AH6/6CB6

V-8

6AU6/6AG5

V-9

6AL5

V-IO 6J5GT

6V6GT

V-ll
V-12 6SN7GT
V-13 I2AU7/6SN7GT
V-l 4 6W6GT/6AS5

6AL5/6H6

V-15
V-16 6SN7GT
V-17 6B06GT

6W4GT

V-18
V-19 IB3GT H.V. RECT.
V-2!

5U4G

*1N60 CRYSTAL USED IN PLACE OF V-6 IN SOME SETS.

FUNCTION
R-F AMP.
MIXER-OSC.
1 ST. IF AMP.

2 ND. IF AMP,

3 RD. IF AMP

VIDEO AMP.
AUDIO DRIVER LIMITER
RATIO DET.
AUDIO AMP.
AUDIO OUTPUT
1 ST. a 2ND. CLIPPER
VERT SWEEP GEN.

VERT. SWEEP OUTPUT
PHASE DET.

HORIZ. OSC.

HORiZ. OUTPUT a H.V. GEN.

DAMPING DIODE

L.V. RECT.

-FINE TUNING

-CHANNEL SELECTOR

^ ANTENNA

INPUT

©

C-6

R' F

TRIMMER

MIXER l-F
C&(PRI - TOP)

©

GET NO 69C70I993-0

v>l2 (SEC-B OT)

sosc

L-'8 jx, L-20

4.5 MCHjP S!P sound t a k e - off

TRAP

“ S ? - ! fv -16

TOP VIEW

OF CHASSIS

L -ll (TOP) L -I2 (BOT.)

©

(TO P) L -I4 (BO T)

-L -I5

Cgp2ND. I-F LOW TRAP

^is)

POWER SWITCH a

VOLUME

©

• V -|9|

l I

r1-------

RATIO

0ET ( O )

(PRI. T 0 P ) V V

fSFr. arm

T-8

FIGURE 4. TUBE AND ALIGNMENT ADJUSTMENT LOCATIONS

4. 5 MC TRAP ALIGNM EN T

Scanned by mbear2k - Jan 2012

1. C onne ct the high sid e of the sign al g en era tor thru a 1000
m m f ca pa cito r to the grid (pin 1) of the vid eo am p lifie r tube
V -7 , and the low side to ch a ssis .

2. C onn ect the vo ltm ete r and germ a nium c ry sta l re c tifi er ,
as shown in F igu re 5, betw een the cathode of the pictu re
tube (y ellow lead) and ch a ss is. Use the low e st volta ge sca le
on the m ete r.

to ch a ss is. Set the c en ter fre qu en cy of the sw eep to about

24. 6 me and a dju st in itia lly fo r a sw ee p de viation of ap 
pro xim ate ly 12 m e. H o w eve r, a sw eep of fro m 8 to 10 m e
may be found b etter fo r o ve r all alig nm ent.

4. Using R -2 6 (100K ) as a d ecou pling re s is to r , con ne ct the
scop e to pin 4 of t est so cke t and ch a s sis . If a stro ng er out
put is req u ired , conn ect the sco pe b etw een the p ictur e tube
cathode and ch a s sis . The cu rv e s een at this p osition w ill be

the re v er se of the p olar ity shown in Fig ur e 6.

3. With the sig nal ge ne rato r a ccu ra tely se t at 4. 5 m e and
m axim um output, a dju st trap L.-18 fo r m in im um re ading on
the m ete r.

IF A M P LIF IE R A LIGN ME NT

Equ ipm ent R equ ir ed:

IF S weep G e ner ator m e etin g the follow in g re qu irem en ts:

18 to 30 m e, ap pr oxim ate ly 12 me sw eep w idth. Output
co nstan t and adjustable to at le ast . 1 volt m axim um
with a cc ur ate ly ca lib ra ted , adju sta ble m a rk e rs.

Cathode R ay O s c illos cop e : p re fer ab ly one with a c a li 

brate d input attenua tor.

NO TE: If there is no bu ilt-in m ar ke r in the sw ee p g en e ra 
tor , lo o se ly cou ple the output of an a ccu ra te ly ca librated

AM signa l ge ne rato r to the IF st rip. At all tim es , k eep the

m ar ker output low enough to prevent the m ar ker fr om d i s
torting the res po ns e cu rv e.

If a wide band scop e is use d, the m ark er w ill be m ore
distin ct if a c ap ac ito r of 100 to 1000 m m f is p la ced a cr os s
the sco pe input. Use the sm a lle st siz e p os sib le , sin ce too
la rg e a valu e w ill affec t the shape of the cu rv e.

1. R em ove the high v olta ge g en era tor tube V -17 (6B Q 6GT )
fr om its sock et to elim in ate ho rizo nta l pic k-u p in the o s c i l
los co pe . R ep lace 6BQ6 w ith 2500 ohm 25 watt r es ist o r c on 
nected fro m B p lus side of fu se to ch a ss is.

5. Set the co ntr ast co n tro l at m inim um .
NO TE: If a disto rte d or un stable p ict ure is seen on the o s 
cillo s co p e durin g a lign m ent, it m ay be n ec e ss a ry to sto p the
os cilla tor by discon n ectin g re s ist o r R -9 (1500) f ro m the
plate (p in 6) of the o scil lat or tube V -2 B (12A T7 ), o r by su b

stitutin g an oth er tube with pin 6 re m ov ed .

CAU TIO N:

A. D o not re du ce the o sc illo s co p e gain and in cr ea se sign al
input so that the top of the cu rv e is fla tte ned , due to lim it 
ing in the v ide o or sco pe am p lifie rs .

B. The d re ss of p late & grid co m ponen ts in the IF a ffec ts

tuning. Do not m o ve in dis crim in ate ly.

C. On the IF co ils and on the tra p s, the res on an ce p oint

w ill be fou nd at two settin gs o f the slu g. The c o r re c t setting

is the one w hich is found w ith the g re ate r p art o f the ad jus t
ing sc rew out o f the c o il.

NO TE: The 1st & 2nd IF tra ps a re tuned fr om bo tto m o f
ch as sis w hile IF co r es a re ad ju ste d fro m the top.

6. Tune the low freq ue nc y trap L -1 4 lo cate d on the 2nd IF

co il fo r m ax im u m attenuation on the c ur ve at 21.9 m e,

DIAG. NO 63A791272-0

DC PROBE 220K

it 22UK

H I

3—a v v w —< >—9 i ——►

I00M MF

2. B y m ean s of an ex tern al ba ttery , ap ply a negative 3. 0
volt bia s fr om the bottom of the 1st IF tube grid coil da m p
ing re s is to r, R-13 , to cha ss is.

3. U sing le ad s as sh ort as p o ssib le , c onn ect the hot side o f
the sw eep ge ner ato r to the g rid (pin 1) o f the 1st IF tube V -3
th ro ugh a 5000 m m f c ap acitor (d o not use the lo ose or

"sp ra y in g " m eth od of cou pling ). T he low s id e is con necte d

21 .9

27.3

FIGURE 6. IF RESPONSE CURVE

220 K

1 N 34

B - B -

FIGURE 5. ELECTRONIC VOLTMETER CONNECTIONS

21 .9

27.3

FIGURE 7. OVERALL RESPONSE CURVE FROM MIXER

6

7. Tune the high fr equ e ncy trap L-12 loca ted on the 1st IF

Scanned by mbear2k - Jan 2012

co il fo r m axim um atten uation on the cu rve at 27. 3 m e.

8. Ad jus t the 1st IF c o il, L - l l , to pla ce a 26 .6 m e m arke r
on the high side o f the re sp on se cur ve 60% down fr om m ax 
im um re sp on se. See F igu re 6.

w ill be indicate d by sh arp p eaks on the o ve ra ll respo nse
cu rve. The os cillat or sh ould be stopp ed, as d es crib e d
abo ve, during this p ro ced u re .

CAU TIO N: Do not inje ct too m uch m a rk er sig nal.

9. Ad ju st the 2nd IF c oil, L -1 5 , to place a 22. 7 me m ark er
on the low s id e of the res po ns e cu rve 6 0 down from m ax i
mu m re sp on se.

10. A djus t the 3rd IF plate tr an sfo rm er T -2 to p rov id e a

flat top or sy m m etr ica l r esp on se c urv e.

11. Re set the tra ps (step s 6 and 7) and again ch ec k the IF

for p rop er re sp on se .

NO TE: It is su gge sted that the bias be re m ov ed for ac cura te
setting of the tra ps.

12. With b ia s ap plied , conn ect the sw ee p betw een the g rid
(pin 2) of the m ix er tube V -2 A (12A T7) and ch a ss is.

13. D isco nn ect the tr im m er , C -1 4, in L C circu it in the
grid of the m ixe r tube, or sho rt the tr im m er thru a 10,000
m m f ce ra m ic d isc type to c ha s sis.

14. B rin g b oth co re s of the m ixe r tr a ns for m e r, T - l , s i
m ultan eou sly fro m the outsid e to wa rds the ce nte r. The

ha lf-w ay m a rk er s shou ld be 2 6.4 m e and 22 .9 me.

NO TE : In align in g the three IF co ils , ea ch co il is adjusted
in dividu ally, but w hen adjusting the prim a ry and se con da ry
of the m ixe r tr an s fo rm e r, the a dju stm ents sh ould be m ade
sim ulta neo usly . The im portan t point to keep in m ind is to
obtain a fla t re sp on se curve with a s m uch gain as p o ssib le .
The side s of the curve should be straig ht and as stee p as
po ssible . Sim ulta neous adjustin g of the p rim ar y and s e c 
onda ry is the ea sie st w ay to obtain this res ult. The tr an s 
for m e r by its elf is , in effe ct, tuned fo r the sa me p ass band
as the three st agg ered c irc u its. See F ig ur e 7. The on ly
diffe re nc e in the o ve ra ll w av efo rm should be that the sid es
of the overa ll w ave are s tee pe r. Con stan t use of the 50%
m a rkers (22. 9 m e and 26. 4 me) should be r es or ted to ,
since it is a bso lu tely n e ce ss a ry to obtain the p ro pe r cu rve .
A s ligh t dip (not exceed ing 10%) is p er m is sib le in the m ixer
tra ns for m e r r esp on se cu rve.

MIX ER LC A DJUS TM ENT

Re con ne ct bia s re m ov ed fo r re ge ne ra tion ch eck . R e 
plac e trim m e r C-14 in LC circ u it of m ixe r grid or rem ov e
10, 000 m m f c era m ic betw een t rim m er and ch a ss is. A dju st
the t rim m er so it is tuned to the cen ter of the m ixer r e 
spon se cu rv e. Th is is in dicated by ob se rvin g the ef fect of

the LC c irc uit on the m ix er res p on se . In cre asin g the c a 
pacity of the tr im m er and b ringin g the L C c ir cu it fro m
above the IF ra nge into the IF ran ge, it w ill be noted that
the m ixe r cu rve w ill pull down on the high sid e, stra ighte n
out as the LC c irc u it a pp roa ch es the m iddle of the ran ge,
and pull down on the low sid e as the LC c irc u it ap pro ach es
the low end of IF ra nge. The p ro pe r tuning point is that
point at wh ich the m ixe r cu rve stra ightens out. In e ffe ct,
the LC c ircu it is s im ila r to a jac k co il w hen it is w ithin the
IF ran ge.

CAU TIO N: Tunin g the LC cir cu it v e ry low wil ca us e

osc illation .

IF SEN SITIVITY M EAS URE MENTS

IF Stages O nly

1. R em ove the ba ttery b ia s fro m 1st IF tu be grid .

2. Con nect an AM sig nal ge n era tor , set at 24. 6 m e, thru
a blo ckin g cap a citor of 5000 m m f, betw een ch a ss is and the

gr.d (pin 1) of the 1st IF tube V -3 .

3. C onn ect an ele ct ro nic vo ltm eter ac ros s the v id eo d e te c

tor load r es is to r R -2 8 (5 600 ). Both lea ds fr o m the m ete r

sh ou ld be d ecou ple d with 100K ohm r e si st ors .

4. 5iet the contra st co nt ro l for m a xim um se n sitivity .

5. Stop the os ci llat or tube by d is con ne cting re s ist or R -9
(1500) fro m the plate (pin 6) of tu b eV -2 B (12A T7) or by su b 
stitutin g anoth er tube with pin 6 re m o ved .

BAND WIDTH

The bandw idth m ay be de term in ed by con ne ctin g an AM
gen era tor to the m ix er grid. With the g ene rato r freq u ency
at 24. 6 m e, ad ju st the output for 1 volt read in g on a V TVM
conn ecte d to pin 4 of test so cke t and ch a ss is . Double the
output of the ge ne rato r. Now by tuning eith er side o f 24. 6
me and noting the fr eq ue nc ie s at which the V TV M again
read s 1 volt, the 6 db bandwidth points are in dicated . T he se
points should be 22 .9 me and 26. 4 m e. By w atch ing the
m ete r while tuning slow ly thru the band any s er io u s peaks
or ho les in the respo ns e can als o be dete cted .

REG EN ERA TION CHEC K

Afte r the above IF and m ix er tr an s fo rm er alig nm ent has
been m ade, a che ck fo r re gen er ation in the IF am plifier
strip shou ld be m ad e. Th is is done by r em o ving the ba tte ry
bias and ob ser vin g the output r esp on se curve on the o s c il lo 
sco p e, as taken betw een the p icture tube ca th ode and ch a s
sis . The bandwidth m ay chan ge with the b ia s re m ov ed but
sh ould not change m ore than 0. 2 m e. Set the co nt rast co n 
tro l to m axim um gain. D e cr ea se the input until the output
sig nal show s a m arke d d e cre a se . An y reg en er ation p rese nt

6. The sig nal req uir ed to p rod uce 1 volt (n egativ e) above
con tact poten tial on the m eter should be le s s than 700 m i cr o 
vo lts .

M ixer & IF Stages

The pr elim ina ry pr epa ra tio ns are the sam e as fo r c h ec k 

ing the sen sitiv it y of the IF sta ges exc ept:

1. Con nect the AM sig na l gen era tor , set at 24. 6 m e, thru
a 5000 m m f c ap a cito r, be tw een ch a ss is and the gr id (pin 2)
ri the m ixer tube V -2A (1 2AT7 ).

2. The signa l req uir ed to pr odu ce 1 vo lt (n eg ative) above
con ta ct p otential on the m e ter sh ould be le ss than 125 m ic r o 
volts .

OS CIL LA TO R, AN TEN NA AND RF AL IG NM E NT

NO TE: The IF m ust be aligne d b efo re the RF section can
be p ro p erly ph ased.

Equipm ent R eq uire d:

Sweep G en era tor: F req u en cy rang e 4 0-2 20 m e; 10 me sw eep

7

width

Scanned by mbear2k - Jan 2012

Output con stant and adjustab le
Ad ju stab le m arke rs (m ark ers shou ld be

calib rated o cc as ion a lly b y che cking
against an a ccu rate sign al g en era tor )

Th is w ill have m ore eff ec t on ch ann els 10 to 13 th a n'7 to 9.
If L - 6 is a djusted , it m ay be n e ce ss a ry to re ad ju st RF tr im 
m er C -6 and re ch e ck the h igh c han ne ls.

10. M ove ban dsw itch to ch ann el 6.

O s cillo s co p e: P r efe ra b ly one with a ca lib ra ted input atten 

Signal G en era tor : Fr eq ue nc y R ange 40 to 220 me

FR EQUEN CY CHA RT

Chan

2
3
4 66-7 2
5
6

7
8
9

10
11
12
13

AN TEN NA & RF ALIG NM EN T PRO CE DU RE

1. Rem ove high vo lta ge g en era tor tu beV -1 7 (6B Q6 GT ) fr om
its sock et and su bstitu te a 2500 ohm 25 w att r e sis to r c o n 
necte d from the B plus sid e of the fuse to c h as si s. Stop the
os cilla tor by disco nn ectin g R -9 (1500) fro m plate (pin 6) of
V -2 B (12A T7).

2. C onnect the sw e ep g en era tor a c ro ss the antenna t er m i
nals on the ch as sis with the antenna lea d -in re m o ved . The
line fro m the sw eep g ene rat or shou ld be as sho rt as p o s si 

ble.

3. C onn ect the o sc illo sc o p e through a deco uplin g r e sis to r
of 150,00 0 o hm s, betwe en the cathod e (pin 3) of the m ixe r
tube V -2 (12AT7) and ch as sis .

uator.

A cc ur a tely ca lib rat ed
AM m o dulated , 400 c y cle

F req uen cy

54-6 0
60-6 6

76-8 2

82-8 8
174-18 0 175. 25 179 .7 5
180-18 6
186-192
192 -198
198-20 4

204 -2 10 205. 25 20 9.75
210 -216

Pict ure

55. 25 59. 75

61. 25

67. 25

77. 25

83. 25

181 .2 5

187. 25
193 .2 5
19 9.25

21 1.25

Sound

65. 75

71. 75

81. 75

87. 75

185. 75
191 .7 5

197. 75
20 3.75 22 5.6 5

215. 75

O sc illat or

81 .6 5
87 .6 5

93. 65
103 .6 5
109 .6 5
15 2.4 5
158 .4 5
164 .4 5
17 0.4 5

23 1.65

237. 65

11. With c en ter fre qu en cy of sw eep ge ne ra tor at the cen ter
fr eq ue nc y of chan nel 6 (8 5 m e) int rodu ce m ark ers c o r r e s 
pondin g to sou nd and pictu re c a r rie r s and com p are with
cur ve o f F ig ur e 9.

NO TE: A c onvenien t m ethod of d eterm inin g w hether a c oi l
is tuned c orr e ct ly is to in se rt a b ra ss or ir on slug into the
co il. B ra ss d e cr e as e s and ir on in cr ea s es the inductan ce.

12. A fte r chan nel 6 has been align ed, p r og r es s dow nw ard

through ch ann el 2.

CAU TION : Make ce rta in the station s ele ct or sw itch is

on the c o r re c t ch ann el b ef ore ch eckin g band p ass .

OS CIL LA TO R A DJU STM EN T

1. Put o sc illa to r ba ck in ci rcu it .

2. R em o ve the sho rt fro m the AG C c ir cu it and app ly a -3

volt b atte ry bias to the AG C bus.

3. M ove the s co pe to the te st soc ke t on the c ha s sis r ea r

with the high s id e con ne cted to pin 4 and the lo w side to

ch a ssis .

4. Set the co nt ras t con tro l at m inim um (co unt er cloc k w is e).

5. R em ov e the fine tuning knob and turn sha ft un til the slot
is in a h oriz on tal p ositio n. T his r ep re se n ts the m id -ca p ac ity

po sitio n.

6. Turn station s ele ct or sw itch to chan nel 12.

7. Set the sw ee p g en era tor on ch ann el 12 w ith a cen te r f r e 
quen cy of 207 m e and at lea st a 12 m e sw e ep. K eep the out
put low enough to show no e vide nce of lim itin g in the o v er all
res po ns e cu rv e.

NO TE : B efore align in g the os c il lat or s ec tion , m ake ce rta in
that L -8 (3. 3 m ic ro he n rie s) in the m ix er gr id is d re ss ed
away fro m C-16 (2 m m f) tied to the sam e grid .

4. Short out the A GC c irc u it with a c lip le ad fr om the A GC
bus to c ha s sis.

5. R e fer to F igu re 4 fo r the RF trim m er lo ca tio n and to

Fig ur e 8 fo r the loc atio ns of the antenna and RF c o ils . The

freq ue nc y char t listed p re vio usly giv es the cha nnel and
alignm ent fre qu e n cie s.

6. T he anten na coi ls are tuned to the video ca r ri er fr e 
quen cy and the R F co ils ar e tuned to the sound c a r ri e rs .
Fig ur e 9 sho ws the shape of the cu rv e wh ich should app ear
on the sco pe fo r ch ann els 2-6 and F igu re 10 the cu rv es for

chan nels 7-10 and 11-13.

7. T urn the sta tion s el ec tor sw itch to chann el 10. Set the
cen ter fre qu en cy of the sw eep g en era tor to the ce nte r f r e 
que ncy o f chan nel 10 (195 m e ).

8. Ad just c e ra m ic tr im m e r, C -6 , so that p icture and sou nd
m a rk ers are as in F ig ur e 11.

9. Ch eck ch ann els 7 to 13 for p ro pe r re sp on se and, if n ec e s 

sa ry, tune the c o i lL - 6 . Th ese co ils m a y be tuned by sp rea d -
ing th em to d ec rea s e ind uctance o r co m p r ess in g them to in 
cr ea s e th eir ind ucta nce. See F igu re 8 for loca tion of c o ils .

8. In troduce a m a rk er co rr esp ond in g to the soun d ca r r ie r
of chan nel 12 (2 09. 75 m e).

9. A dju st C-12 os cilla t or c e ra m ic tr im m e r so that the
sou nd m a rke r fa lls into the 21 .9 m e trap d ip in the r es po n se
cu rve .

10. T urn g en era tor and sta tion s el ec to r to ch ann el 9 w ith

the fin e tuning sh aft slot still in the h oriz on tal po sition .

11. S pread or co m p re ss the 3 -tu rn co il lo ca ted in the ce n 

ter of the o sc illa to r plate ( L -4 M , F ig ur e 8) s o that the sound

m ar ke r fo r ch anne l 9 fa lls into the 27. 3 m e trap dip in the

res po ns e cu rv e. A s the os cil lat or is t un edb elow the c a rr ie r
on chann els 7, 8, 9 , 10, the 27. 3 m e tra p w ill be in the sa m e
po sitio n as the 21. 9 m e trap in s te p 9.

12. Re peat s teps 6, 7, 8 & 9.

13. T urn g en era tor and sta tion sele ct or to chan nel 13.

14. Tu rn fin e tuning trim m e r s o that the sound m a rke r fo r
chan nel 13 fa lls into the 21. 9 m e trap dip of r esp on se cu rv e .
The s lo t in the fin e tuning sh aft s hould not have m ov ed m o re
than 30 d eg re es fr om the ho rizo ntal p ositio n to ac co m p lish

this (e ac h nu m ber on the sta tion s ele ctor knob r ep res en ts

Scanned by mbear2k - Jan 2012

30 d e g r e e s .)

17. T ilrn s we ep ge ne rato r and station s e lec to r s witch to

ch ann el 6.

15. If m o re than a 30 de gree chan ge in fin e tuning t rim m e r
was needed in ste p 14, adjust ch annel 13 os cil lat or co il
(L -7 ) by sp read in g or c om p re ssin g until the 30 d egr ee r e 

qu ire m ent is m et.

NO TE: Each ad ju stm en t of channel 13 o sc illa to r c o il w ill

ne ces sita te a re- ch ec k in g of the o s cilla tor t rim m er C-12

on chann el 12 as p er ste ps 6, 7, 8 & 9.

16. Ch eck ch ann els 12, 11, 10, 9, 8, and 7 by noting w hether
the fin e tuning trim m e r ca n dr op the sound m a rk er for each
ch annel in the trap d ip by a 30 d eg ree rota tio n. If one o f the
ch ann els d oes not m e et the 30 degre e re qu irem en t, a co m 
pr om ise m u st be m ade by rese tting cha nnel 9 o r 12, w h ic h
eve r is c lo se r to the ch annel in qu estion .

Exam ples:

1. If cha nnel 11 d oes not m ee t the 30 d eg ree re q u ir e
m ent, retu rn station se le cto r and ge ne rato r to cha n
nel 12 and tune c er am ic tr im m er C -12 tow ard ch an
nel 11 (trim m er fr eq ue n cies lo w ere d b y tightening

sc re w ). Th is w ill ten d to mo ve cha nnel 12 sound
m ar ke r out o f the trap d ip, but this can be co m p en 
sated fo r by the fine tuning t rim m e r. Do not ad just
trim m er any m ore then is n e ce ss a ry to get the ch an
nel in question b ack w ithin the 30 d eg ree re q u ir e
men t.

2. If ch anne l 10 d oes not m eet the 30 d eg ree re q u ir e
me nt, m ove station se lec to r and gen er ato r to ch an
nel 9 and tune the 3-tu rn co il (L -4 M , F ig ur e 8)
towa rd cha nnel 10 (c oi l fre q ra ise d by sprea ding
turn s). T his w ill als o tend to m ove chan nel 9 sound
m a rke r out o f the tra p dip, but th is can be c om p en 

sated fo r by the fine tuning t rim m e r. Ag ain , do not
adjust the c oil any m o re than is n e ce ss a ry to b ring
the ch annel in qu estion b ack w ithin the 30 d egr ee r e 
qu irem ent.

18. A d ju st cha nnel 6 o s cilla t or coil (L .-4 E , F ig ur e 8) s o
that the soun d m a rk er fo r cha nnel 6 fa lls into the 21.9 m e
tra p dip w ith the fine tuning t rim m e r at m id-c ap a cit y (sh aft

slot in h oriz on tal p os itio n). Alw ay s sp rea d or co m p r es s
chan nel 6 os ci lla to r c oi l in units of 3 tu rns . C om p ress ing
turn s w ill m ove curv e tow ard sound m ar ke r, wh ile sp re ad 
ing w ill m o ve cu rv e tow ard v ide o m a rk er .

IM PO RT AN T : Since the co ils are in s er ie s , the pro pe r
alig nm ent of chan nel 6 w ill s im p lify the ph asing of the ch an 
nels to fo llo w .

19. Ad ju st ch ann els 5 and 4 s o that the sound m ar ke r fo r
each chan nel fa lls into the 21.9 m e tra p d ip in the cu rv e with
the fin e tuning trim m er set no m o re than 15 de gr ee s fro m
m id -c ap a city .

20. Cha nnels 3 and 2 shou ld be adju ste d so that the sound
m a rker fa lls into the 21. 9 m e tra p dip with the fin e tuning
trim m e r within 15 d e grees of m axim u m ca pa city .

CHANNELS 2 TO 6

S

----

SOLID LINE INDICATES OPTIMUM

RESPONSE.

— DOTTED LINES INDICATES

PERMISSIBLE VARIATION.

FIGURE 9. RF RESPONSE CURVES CHANNELS 2-6

L-5B

CHANNEL 5

CHANNEL 7

L-2

L-5A

CHANNEL 4
CHANNEL 3
CHANNEL 2
ANT. SECT.

-2 A

L-2B REAR VIEW OF
L-2C OSC. SECTION

L-4 C L-4M

CHANNELS 7 TO 13

FIGURE 8.

ANTENNA, RF AND OSCILLATOR COIL LOCATIONS FIGURE 10. RF RESPONSE CURVES CHANNELS 7-13

9

OV E RAL L RE CE IVE R SEN SIT IV IT Y M EASU RE ME NT

Scanned by mbear2k - Jan 2012

An o ve ra ll m eas urem ent of s en sitivity is ma de as f o l

lo w s:

1. Connect an A M sign al g ene rat or to the input term in als
of the re ce iv er ch as sis after re m ov in g the sh ort 300 ohm
lea d wh ich con ne cts to the antenna input st rip on the ba ck of

the ca bine t. To m atch the g en era tor to the re c eiv e r input,

a r es ist ive m atch in g networ k shou ld be u sed. In the ca se o f
a g enerato r w ith a 50 ohm output im pe da nce, for exa m ple,

place a 100 oh m re s ist or in se rie s with the output te rm in al
of the gene rato r and a 150 ohm r esis to r in s e rie s with the
ground te rm in al.

CIRCUIT DESCRIPTION

2. F r om ca th ode of pictu re tube to c ha s sis con ne ct a c a li 
brate d o s ci llo sc o p e .
NO TE: To ca lib ra te sc op e, c onnec t it a cr o ss 6 .3 volt f ila 
me nt supp ly . T he p e ak -to -p ea k am plitud e on the sc re en w ill
then be ap pro xim a tely 18V (6. 3 x2 . 8).

3. Set co ntr ast con t rol for m a xim um sen s itiv ity.

4. Tune sign al g en era tor to the vid eo c a rr ie r fr eque ncy of
the ch annel bein g c he cke d. Ge ne rato r sig na l shou ld be 30%
m odulated at 400 cyc le s. The sign al fro m the g en era tor to
prod uce 20 v olts p ea k -to -p e ak at p icture tube cath ode sh ould
be le ss than 25 m ic ro volts on cha nnels 2 to 6 and le ss than
75 m icr ov o lt s on ch annels 7 to 13.

The cir cu it d e scr ip tio n app earing in the T S-89 s er v ice
man ual app lies to the T S-1 72 c ha ss is with the fo llo w in g e x 
cep tion s:

1. C -17 , the R F to m ix er cou pling co nd en se r, is 6 m m f in 
stead of 8 m m f.

2. In s om e set s, V -6 (6A L 5) the vide o d e tec tor , is r ep la ce d
by a 1N60 germ aniu m c ry sta l.

3. C apac ito r C -4 1 and r e sis to r R -3 2 , a pa rt of the ca th ode
com pe nsa tin g netw ork on the T S -89 , betw een the grou nd end
of the co ntras t co n tro l and the low es t tap^have b een re m ov ed.
L -1 7 is change d to a re d -g re e n dot c o il.

4. In som e se ts , a 6CB6 tube is su bstitu te d fo r the 6AH6 in
the vid eo am p lifie r stage (V -7 ). The sc re en r e sist or , R -35

chan ges fro m 33K to 22K with this su bstitu tion . Ano th er
su bstitution fo r the 6AH 6 is a 6BC 5. T he sc re en r e sis to r
R -35 is ch anged to 22K with this sub stitu tion als o.

5. A n ad dition al RC netw ork, co ns isting of R-100 (470K )
and C -92 (100 m m f) has b een add ed in the clip p er input c ir 
cuit. T his netw ork , wh ich has a s hort tim e constan t, helps
to m inim iz e the e ffe ct o f noise pu lse s at the clip pe r g rid.

I

6. In som e se ts, a 6SN7 tube is sub stituted fo r the 12AU7
ve rt ic a l sw ee p ge ne rato r (V -13 ). The seco nd m u lt iv ib rato r
grid r es is to r , R-6 3 , ch ang es f rom 330K to. 100K with this
substitution.

7. In som e se ts a 6AS5 tube is sub stituted fo r the 6W6 v e r 

tica l output tu be. No com p onen t cha nges are re qu ired with
this su bstitu tion .

8. In som e sets a 6H6 tube is substituted fo r the 6A L5 h o r

izo nta l phase de tector V -1 5. No com ponen t changes are r e 
quire d with this su bstitu tion .

9. The dam ping res ist or a cr os s o s cilla to r c o il L -4 E was
ch anged fro m 2200 ohms to 3900 ohm s to s tab ilize the o s c il 
la tor on the low ch ann els.

10. In som e s ets, 6AG5 tubes a re su bstituted for 6AU6
tu bes in the fi rs t and se con d IF a m p lifie r sta ge s. L - ll, the
first IF c oil, L -12, the low freq ue nc y trap , L -15 , the s e c 
ond IF co il, and L -1 4, the high freq uenc y tra p, are chan ged
in value with this su bstitu tion . See p arts list. R-13 , the
dam ping r es ist o r a cr o ss T - l , ch anges fr om 6800 oh ms to

4700 oh m s. R-14, the fir s t IF stage ca th ode r e s isto r, is
bypas sed with a 1500 m m f ca p ac itor and R-14 and R-19 , the
seco nd IF stag e cathod e re s is to r, ch ange fr om 47 to 56
ohm s w ith this sub stitution.

11. In som e se ts , a 6A G5 is substituted for the 6AU6 in the
audio d r iv e r-l im ite r stag e. Th is is an ex ac t r epla cem en t
and re qu ires no c irc u it or com p onen t ch an ge s; h ow ev er,
substitution of one fo r the other in the field re qu ire s r e 
touching the a lign m ent o f the pr im a ry of the d iscr im ina to r
tra n sfo rm e r fo r b es t p erfo rm a n ce.

12. R-15, R -2 0 , C -24 , and C-2 9 ar e re m o ve d. R-14 and

R-19 , the cathod e r es is to rs fo r V -3 and V -4 , a re gro unde d

dir ec tly . The su p pr es so rs a re also g ro und ed.

13. The v ide o a m p lifier B plus su pply w as chang ed fro m

the 240 v olt bus to the 265 v olt bus and the au dio am p lif ie r
B plus su pply was cha nged fro m the 265 vo lt bus to the 310
volt bu s. The boo tstra p ca pa cito r C -8 3 , w hich w as co nn e ct
ed to the 240 v olt bus is now co nn ected to the 310 vo lt b us.

14. In la ter s ets , the ho rizo nta l output tube s cr e en re s ist or

R -9 4, is r eturn ed to the loa d sid e of the fuse F - l .

15. It has been found that c ert ain powe r t ra n sfo rm e rs

ra ise the "B " v oltage 35 to 45 v olts too high . In ord er to
affor d a m easu re of p rot ectio n fo r the 6B Q6 and 6W 4 in
th ese in stan ce s, a re s ist or R -104 has be en pla ced in s er ie s
with the sp ea ker field .

This c ond ition a ris es on ly with ce rta in issu e "O " , " A " ,
or "B " tr an sfo rm e rs (issue d esign ation follo w s the p art
num ber sta mp ed on t ra n sfo rm e rs) . In is sue "C " t ra n sf or m 
er s , w hich are cu rr en tly b eing p roduce d, this diffic ulty has
been re m ed ied and the r e sis to r is no longe r n ec e ss ar y .

In future re pla cem en ts of tr an s for m er s, a c he ck should
be m ad e of "B " volta ge. If it is found to be low a fter the
new tra n sfor m e r has been ins ta lled, re m o ve the r e sis to r
mentioned ab ove . If " B " vo lta ge is found to be higher than
no rm a l, in se rt c o rr e c t R -10 4 re sis to r in ser ie s with sp ea k
er fie ld, as shown in sc he m atic d iag ram . C o rr ect part
nu mbers for these r e sis to rs will be foun d in R E PL A C E 
MEN T P AR TS LIS T.

The tube su bstitu tion s wer e n ec es sa ry be cau se of the
cr itic a l s horta ge in so m e tube typ es. T hese su bstitu tion s
do not affe ct the op era tio n or c irc u it th eory .

10

)

REPLACEMENT PARTS LIST

Scanned by mbear2k - Jan 2012

NOTE : When or der in g pa rts , spe cify m odel num ber of set in add ition to p art num ber and d esc rip tion of p art.

Ref. Part List
No. Number Description Price

CHASSIS PARTS - ELECTRICAL

Capacitors
C-l
C-2 21K77375
C-3
C-4 21K77375
C-5
C-6 1X701662

_

See Tuning Unit Parts List..
Ceramic

21A470789 Ceramic

Ceramic

21K470322

Molded: 20 mmf 500V
Trimmer,, ceramic: .5-3 mmf;

tubular: 220 mmf 500V .20
disc: 5000 mmf 450V .30
tubular: 220 mmf 500V .20

......

.25

-

Ref. Part List
No. Number Description Price

C-62 8R9851 Paper: .02 mf 20 0 V ..........20

C-63 8R9870 Paper: .01 mf 6 0 0 V ..........25

C-64 8R9866 Paper: .001 mf 60 0 V .........20

C-65 21R6590 Mica: 500 mmf 50 0 V ..........25

C-66 8R9873 Paper: .05 mf 6 0 0 V ..........25

C-67 8R9875 Paper: .15 mf 6 0 0 V ..........35

C-68A,B
C & D 23B700160 Electrolytic: 4-section; 80

complete with screw & mtg

nut . . . .

C-7

C- 8

C-9
C-10
C-ll

21A470790
21A470790
21K482726

Ceramic disc: 1500 mmf 500V
Ceramic disc: 1500 mmf 500V
Ceramic disc: 10,000 mmf 450V
See Tuning Unit Parts List..
Fine Tuning Trimmer (part of

station selector switch)...

C-12

1X701662

Trimmer, ceramic: .5-3 mmf;

complete with screw & mtg

nut
C-13
C-14

1X792784

See Tuning Unit Parts List..

Trimmer, ceramic: 3-13 mmf;

complete with screw & mtg

nut
C-15
C-16
C-17
C-18
C-19

21K478280
21K470324
21A470789
21K77375

See Tuning Unit Parts List..
Molded: 2 mmf (temp comp)..
Molded: 6 mmf 500V
Ceramic disc: 5000 mmf 450V
Ceramic tubular: 220 mmf

500V
C-20
C-21
C-22
C-23
C-24
C-25
C-26
C-27

21K478280
21A470789
21A470789
21A470790
21A470790
21A470789
21A470789 Ceramic disc: 5000 mmf 450V
21K77375

Molded: 2 mmf
Ceramic disc:
Ceramic disc:
Ceramic disc:
Ceramic disc:
Ceramic disc:

Ceramic

C-28 21K470329 Molded:

comp)
C-30 21A470789 Ceramic disc: 5000 mmf 450V .30
C-31
C-32

21K77375

21A470789 Ceramic disc: 5000 mmf 450V.

Ceramic

C-33 21A470789 Ceramic disc: 5000 mmf 450V. .30
C-34 21A470789
C-35
C-36

21A470789 Ceramic disc: 5000 mmf 450V .30
21K470329 Molded:

Ceramic disc: 5000 mmf 450V .30

comp)
C-37

21K470324 Molded: 6 mmf 500V .......

C-38 8R9854 Paper:

.................

......................

.....................

.......

....................

500V ...
5000 mmf
5000 mmf
1500 mmf
1500 mmf

450V
450V

500V
500V

5000 mmf 450V.

tubular: 220 mmf 500V .20
30 mmf 500V (temp

tubular: 220 mmf 500V .20

30 mmf 500V (temp

.1 mf 200V .......

.20

.30
.30
.30

.2 0

.45

.25
.25
.30

.2 0

.25
.30
.30
.30
.30
.30
.30

.30

.30

.30
.25
.25

C-69A,B
C & D 23B700159

C-70

C-71
C-72
C-73
C-74
C-75
C-76
C-77
C-78
C-79
C-80
C-81
C-82

C-83

C-84

C-85
C-86A ,B

& C

8R9869 Paper: .005 mf 600V
8R9866 Paper: .001 mf 600V
8R9866 Paper: *.001 mf 600V
8R9866 Paper: .001 mf 600V
8R9870
8R9869 Paper: .005 mf 600V
21K400037 Ceramic tubular: 270 mmf 500V .25
21R2741
8R9869 Paper: .005 mf 600V
8R9854 Paper: .1 mf 200V
8R9874
8R490263
21K700883

8R9874
21K790574

8R9874

i

23B700613

& C 23B700614

C-88
A & B

C-89
C-91

23B700615

8R9810

8R9854
C-92 21R6574
C-93 21K482726
C-94

21K482726
C-95 21K780599
C-96 21K780599

Capacitor-Resistc

C-42 21K470329 Molded: 30 mmf 500V ...... .30 CR-1 21B702478

C-43
C-44 21K790683
C-45
C-46 21A470789
C-47

21A478274 Molded: 2.2 mmf 500V

Molded: 60 mmf 500V

21A470789 Ceramic disc: 5000 mmf 450V.

Ceramic disc: 5000 mmf 450V.

21K790439

Silver mica: 15 mmf (part of

T-3 base)

...............

C-48 8R9866 Paper: .001 mf 600V
C-49

21A790131

Ceramic

C-50 21R6590 Mica: !

tubular: 150 mmf 500V .35

500 mmf 500V

C-51 21R6590 Mica: J500 mmf 500V ......

C-52 23A90205 Electrolytic: 10 mf 50V....

C-53 21K482726 Ceramic
C-54

8R9869
C-55 21R6650
C-56 8R9869
C-57

21K470322

Paper: .005 mf 600V
Mica: 68 mmf 500V
Paper:
Molded:

disc: 10,000 mmf 450V .30

.005 mf 600V

20 mmf 500V

C-58 8R9873 Paper: .05 mf 600V ......

C-59 8R9869 Paper: .005 mf 600V......

C-60 8R9869 Paper:

.005 mf 600V

C-61 8R9870 Paper: .01 mf 600V

....

.....

.....

...... .25

.....

.......

.....

.......

.....

.....

.25
.25
.30 CR-2
.30

.20 CR-3
.20

.25
.45

Crystal
E-l

.20
.20
.20

.25

Fuse

F-l
.25
.20 Coils
.20 L-l
.25

21B702479

21B702636

48B702302

65K702901

24A790033

mf/400V, 40 mf/300V, 20 mf/

300V, 10 mf/300V.......... 3.05

Electrolytic: 4 section; 80

mf/400V, 40 mf/400V, 100 mf/

50V, 20 mf/25V ........... 3.10

......

.....

......

......

Paper: .01 mf 600V

........ .25

......

Mica: 680 mmf 500V

....... .35

......

.......

Paper: .1 mf 600V

....... .35

Molded paper: .1 mf 600V...

.20
.20
.20
.20

.20

.20
.25

.35

Ceramic tubular: 180 mmf

3000V

...................

Paper: .1 mf 600V

........

.50
.35

Ceramic tubular: 60 mmf 1500V

(in deflection yoke)

Paper: .1 mf 600V

.....

.35

........ .35

Electrolytic: 3-section; 80 mf/

400V, 20 mf/300V, 10 mf/300V 2.55

Electrolytic: 3-section; 60 mf/

400V, 40 mf/300V, 20 mf/25V. 2.45

Electrolytic: 2-section; 35 mf/

400V, 100 mf/50V
Paper: .25 mf 100V
Paper: .1 mf 20 0 V
Mica: 100 mmf 500V

.......... 1.50

....... .25

...........

.......

35

.15
Ceramic disc: 10,000 mmf 450V .30
Ceramic disc: 10,000 mmf 450V .30
Ceramic tubular: 1000 mmf 500V .25
Ceramic tubular: 1000 mmf 500V .25

coupling(optional to C-54,

R-46 & R-47)

.................

70

Capacitor-Resistor: video

compensating (optional to

C-39, C-40, R-32 & R-33).. . .70

Capacitor-Resistor: vertical

integrating (optional to
C-59, C-60, C-61, R-58, R-59,

& R-60)

.....................

80

(optional to 6AL5 video

detector)

leads

Coil

................

1.35

.25

.50

11

Ref. Part

Scanned by mbear2k - Jan 2012

No.

L-2
L-3
L-4
L-5

L-6
L-7
L-8
L-9
L-10
L-ll

Number Description

_

-

-

-

24K792825

-

24K792577

See Tuning Unit Parts List..
See Tuning Unit Parts List..
See Tuning Unit Parts List..
See Tuning Unit Parts List..
RF coil: channel 13
See Tuning Unit Parts List..

RF choke: 3.3 microhenries..
24K780128 RF choke: 2.2 microhenries.. .20 or
24K790035
24B701343

RF choke: 5.6 microhenries..

1st IF: complete with LC

trap, cores, & mtg nuts

24K702495 1st IF: complete with LC R-17

(for 6AU6)

or

..............

trap, cores, & mtg nuts

L-12
L-13

L-14
L-15

-

24K790035

-

24K701344

(for 6AG5)

27.3 me trap (part of L-ll).

RF choke: 5.6 microhenries..

21.9 me trap (part of L-15).

2nd IF: complete with LC

..............

trap, cores, & mtg nuts

or 24K702496

(for 6AU6)

2nd IF: complete with LC R-26

..............

trap, cores, & mtg nuts R-27

L-16
L-17
L-18

or

(for 6AG5)

24K792771

RF choke: yellow dot
24K792772 RF choke: red-grn dot
24B792735

1X792736

4.5 me trap: less core & mtg
nut

.....................

4.5 me trap: complete with

..............

core & mtg nut

L-19

24K701652

L-20 24A470159

1X790341

or

Compensating coil: black dot
Sound take-off: less core & R-35 6R6400

mtg nut

.................

Sound take-off: complete with

core & mtg nut

L-21

24K701651

Compensating coil: green dot

(wound on R-99)
L-22
L-23

or

24B700548 Focus coil . . . ,
24K790059

Horizontal oscillator: less R-40

core & clip

24B790055

Horizontal oscillator: com R-42

...........

.............

plete with core & clip .... 1.45 R-43

or
or
or
or

or

24K700776
24K700778
24K700694
24K700714
24K700774
24K790145
24K790145
24K700089

24B700088

Deflection yoke: complete...
RF choke: 0.47 microhenries.
RF choke: 0.47 microhenries.
Horizontal size: less core &

Horizontal size: complete

L-24

L-25
L-26
L-27

with core, clip, & mtg nut.

Speakers
LS-1

50K700850

Speaker: 8” electro; 100 ohm

field (hot); 3.2 ohm voice

coil (17K1E, 17K2E)

50C701846

Speaker: 8” electro; 100 ohm

field (hot); 3.2 ohm voice

coil (17K1E)

............

Resistors

Note: All resistors are insulated carbon

unless otherwise specified.

type

R-l

R-2

R-3
R-4
R-5
R-6

12

6R6397
6R6056

6R5614

6R2036
6R6229
6R5659

22,000 10% 1/2W ......doz

47,000 10% 1/2W
56 10% 1/2W

.........

33 10% 1/2W .

1000 10% 1/2W ........doz

3900 10% 1/2W ........doz

Part

_

6R6038
6R6117
6R6393

6R6428

.......

List Ref.

Price

No. Number

_

-

-

-

.25

-

.20

R-7
R-8 6R6320
R-9
R-10
R-ll
R-12 6R6080
R-13

6R6080

.30

6R5550
6R5614 56 10% 1/2W (for 6AG5).

or

.90

R-14

R-16 6R6069

6R6394

R-18 6R6229

.90 R-19 6R5550

-

.30

-

R-21 6R6069
R-22 6R6428 6800 10% 1/2W

or

6R5614

R-23 6R2035

.90 R-25

R-24

6R6038 1500 10% 1/2W
6R6031
6R6031
6R3966 1.5 meg 20% 1/2W

.90 R-28 6R6117 5600 10% 1/2W

......

......

.35

.35

R-29 6R6004
R-30

6R5550
R-31A
& B 18A792009

..........

.50

.75
.50.

.35 or 6R6341

..........

.........

.80

.50 R-3 8

10.20

.R-36

R-37

R-39

- 12,000 (not replaceable;

6R5671

6R3933

6R2004 8200 10% 1/2W

6R5660

.95

R-41

6R6012
6R6428 6800 10% 1/2W
6R6428

R-44 6R2122

6R6414
6R6032
6R6032
6R6022
6R476004
6R6320
6R3927
6R6004
6R6397
6R2096
6R6428

6R5581

6R5581 3300 10% 1/2W .......

6R6031
6R603I
6R6397
6R6031
6R5577
6R2096

6R6031

or

.......

exch

exch

11.00
.20
.20

.55

1.35

6.30*

4.75

6 .30*

4.75

R-45
R-46
R-47
R-48
R-49
R-50
R-51
R-52
R-53
R-54

R-55
R-56
R-57

■*

R-58
R-59
R-60
R-61
R-62
R-63

R-64 18A90147
R-65

6R6428

R-66 6R5577

6R6032

18A702403
6R2118
6R3949

18A702407

......doz

doz

........doz

1.20

1.20

1.20

1.20

1.20

R-67
R-68
R-69
R-70
R-71

1.20

♦Plus Federal Excise *ax At Current Rate

Description

See Tuning Unit Parts List..
10,000 10% 1/2W
1500 10% 1/2W
5600 10% 1/2W
1200 10% 1/2W
4700 10% 1/2W

___

.......

.......

.......

.......

doz

...

,doz 1.20
,doz 1.20
.doz 1.20

.doz
6800 10% 1/2W (for 6AU6)dz
4700 10% 1/2W (for

6AG5)

...............

47 10% 1/2W (for 6AU6),

.doz 1.20

.

.doz 1.20

.doz 1.20
2200 10% 1/2W

.......

12,000 10% 1/2W
1000 10% 1/2W

.......

47 10% 1/2W (for 6AU6).
56 10% 1/2W (for 6AG5).
2200 10% 1/2W

.......

.......

82 10% 1/2W

.........

.......

100,000 10% 1/2W
100,000 10% 1/2W

.......

1 meg 20% 1/2W
47 10% 1/2W

......

.........

.....

....

....

....

.doz

.

.doz 1.20
.doz
.doz
,doz 1.20
,doz 1.20
,doz 1.20

doz
.doz
.doz
.doz
.doz 1.20
.doz 1.20
,doz
.doz 1.20

Contrast & Volume control:

dual; 2000 tapped & 1 meg
respectively; includes

power switch .........

.
33,000 10% 1W (for 6AH6)...
22,000 10% 1W (for 6CB6)..

part of L-19)
4700 10% 2W
220 20% 1/2W

180 10% 1/2W

33,000 20% 1/2W

6800 10% 1/2W .......

4.7 meg 20% 1/2W
270,000 10% 1/2W
470,000 20% 1/2W
470,000 20% 1/2W

330 10% 1/2W ........

........

.........

........

.......

........

.....

.......

....

....

....

....

.doz
.doz
.doz
.doz 1.20

.

.doz 1.20
.doz
.doz 1.20
.doz
.doz 1.20
.doz

.doz 1.20

1000 20% 2W .........

10,000 10% 1/2W

2.2 meg 20% 1/2W
1 meg 20% 1/2W

......

22,000 10% 1/2W ....

330,000 10% 1/2*

6800 10% 1/2W .......

3300 10% 1/2W

.......

100,000 10% 1/2W
100,000 10% 1/2W
22,000 10% 1/2W
100,000 10% 1/2W
2700 10% 1/2W

.......

.....

....

....

---

....

.....

....

.doz 1.20
.doz
.doz

doz
.doz
.doz 1.20
.doz

.doz

-
.doz
.doz
.doz
.doz

330,000 10% 1/2W (for

.doz

100,000 10% 1/2W (for

.doz

Vertical Hold Control: 1
6800 10% 1/2W

.......

meg .80

2700 10% 1/2W .......

470,000 20% 1/2W
Vertical Size Control: 5

3.3 meg 20% 1/2W

470 20% 1/2W ........

.....

....

.doz 1.20

meg
.doz 1.20
.doz

Vertical Linearity Control:

List

Price

-

1.20

1.20

1.20

1.20

1.20

1.20

1.20

1.20

1.20

1.20

1.20

1.75
.20
.20

-

.25

1.20

1.20

1.20

1.20

1.20

1.20

.25

1.20

1.20

1.20

1.20

1.20

1.20

1.20

1.20

1.20

1.20

1.20

1.20

1.20

1.20

1.20

.80

1.20

1.50

Ref.

Scanned by mbear2k - Jan 2012

No.

Part

Number

R-72

R-73

R-74
R-75
R-76
R-77
R-78
R-79

6R6291

6R6291

6R6056
18A702401
6R6004

17K700782

18A702404

17K792705
R-80 6R6477
R-81
R-82
R-83
R-84
R-85

R-86
R-87

6R6031
6R6031
6R2122
6R2122
6R6428
6R6229

6R3949 470 20% 1/2W
R-88 6R5631
R-89
R-90
R-91
R-92
R-93
R-94

18A791574
6R6074
6R6038

6R6032

6R5583

6R5690

R-95 6R5721
R-96
R-97

R-98

R-99

R-100
R-101

6R5721

6R5577

6R6328

-

6R6032

6R6018 100 20% 1/2W

R-102 6R5551
R-103

6R5551

R-104 17K702449

Description

560 10% 1/2W (in deflection

yoke)

............

....doz 1.20

560 10% 1/2W (in deflection

yoke)

............

47,000 20% 1/2W
Brightness control: 1
1 meg 20% 1/2W

Wire wound: 375 10%

....doz 1.20

....doz 1.20

---
meg. . .

....doz

---
10W

Focus control: 1000 .
Wire wound: 2000 10%

10W. ,
15,000 10% 1/2W ...
100,000 10% 1/2W ..
100,000 10% 1/2W ..

4.7 meg 20% 1/2W ..

4.7 m?g 20% 1/2W . .
6800 10% 1/2W

1000 10% 1/2W

....

....

.....

120,000 10% 1/2W ..
Horizontal Hold: 100,

....doz

000

68,000 10% 1/2W ...

1500 10% 1/2W

....

470,000 20% 1/2W ..

47 10% 1W

6800 10% 2W

150,000 10% 1W
150,000 10% 1W

.......

......

---
___

.........

2700 10% 1/2W (in deflec

tion yoke)

........

....doz 1.20

100,000 10% 1W (in deflec

tion yoke) ........

2700 (not replaceable

.........

; part

of L-21) ..........

470,000 20% 1/2W ..

......

120 10% 1/2W
120 10% 1/2W

Wire wound: 150 10%

.....

.....

....doz

15W

(for 25C701025 & 25C700161

or

17X700423

trans)

Wire wound: 75 10%

25C700169 trans)

...........

10W (for

___

Tr ansforrears
T-l

24K792578

Mixer IF: less cores & mtg

nuts

....................

or 1X792591 Mixer IF: complete with cores

T-2

or

2*B792585

1X792592

& mtg nuts

3rd IF: less core, mtg nut, &

colored leads

3rd IF: complete with core,

..............

...........

mtg nut, C-35, & colored
leads

T-3 24B790125

T-4
T-5

T-6

25B790686 Audio Output
25K701619
24K792753

Ratio Detector: complete less

Vertical Output

High Voltage Transformer ....

...................

shield can

..............

.............

..........

T-7 35B790140 Filament Transformer:

T-8

25C700161

isolating (for V-18)

......

or 25C700169
or 25C701025

25K700882 Power Transformer .........

or

Tubes
V-l

6CB6

V-2 12AT7

or

or

or

6AU6
6AG5
6AU6
6AG5
6AG5
6AL5

1N60

6AH6

V-3

V-4

V-5
V-6

V-7

or 6CB6

RF Amplifier
Mixer-Oscillator

1st IF Amplifier

2nd IF Amplifier
3rd IF Amplifier

Video Detector

Video Amplifier

.............

.........

.........

.........

.........

...........

.....

.

___

___

List

Price

.80

1.20
.35

1.55
.35

1.20

1.20

1.20

1.20

1.20

1.20

1.20

1.20

1.20
.80

1.20

1.20

1.20

1.20

1.20

1.20

1.20

1.10

2.00

1.40

3.25

7.25

3.05

16.65

.20
.25
.20
.20

.20

_

.50

.25

.45

.85

.65

-

-

-

-

-

-

-

Ref.
No. Number

Part

Description

List

Price

V-8 6AU6

or 6AG5 Audio Driver-Limiter
V-9
V-10
V-ll 6V6/GT Audio Output
V-12
V-13

6AL5 Ratio Detector ............

6J5/GT Audio Amplifier

..........

.............

6SN7GT 1st & 2nd Clipper .........

12AU7

or 6SN7GT Vertical Sweep Generator ...

......

-

-

-

-

-

-

V-14 6W6

or 6AS5 Vertical Sweep Output

.....

-

V-15 6AL5

or
V-16

6H6 Phase Detector
6SN7GT

V-17 6BQ6GT

Horizontal Oscillator

...........

Horizontal Output & High

.....

-

-

Voltage Generator ........ -

V-18

6W4GT Damping Diode

............

V-19 1B3GT High Voltage Rectifier

....

-

-

V-20 17BP4

or 17AP4 Picture Tube: 17” rectangular
V-21 5U4G Low Voltage Rectifier

.....

-

-

TUNER

Model TT-13 Tuning Unit

1X700100 TT-13 Tuning Unit: includes

station selector switch,
fine tuning trimmer, and
the following components:.. 10.85

C-l 21K478234 Capacitor, molded: 8 mmf

500V

...................

. .25

C-10 21K482726 Capacitor, ceramic disc:

10.000 mmf 4 5 0 V

............

30

C-13* 21K482726 Capacitor, ceramic disc:

10.000 mmf 450 V

............

30

C--15 21K400173 Capacitor, molded: 10 mmf

500V (temp comp)

......... .30

L~2 24C792764 Coil, antenna: channels 2

thru 6; includes L-2A thru
L-2E (L-2F thru L-2L are

part of switch)

.............

25

L-3 24K790536 Coil, RF: channels 2 thru 6;

includes L-3A thru L-3E
(L-3F thru L-3L are part

of switch)

..................

20

L-4 24C700114 Coil, oscillator: channels 2

thru 6; includes L-4A thru

L-4E (L-4F thru L-4L are

part of switch)

.............

05

L-4M 24K700115 Coil, oscillator; channel 10 .10
L-5 24K792765 Coil, antenna primary: low

frequency; includes L-5A,

L-5B , & L- 5 C

................

15
L-7 24K700116 Coil, oscillator: channel 13 .10
R-7 6R5659 Resistor: 3900 10% l/2W.doz 1.20

42K790136 Clip, spring (on collar)

.......

10

43K700725 Collar, spring (on rear end

of fine tuning shaft).........10

47K700726 Shaft, fine tuning

........ .50

Part List
Number Description Price

CHASSIS PARTS - MECHANICAL

7K700153 Bracket, coil mtg (L-27)

............

05

7B700194 Bracket, focus coil housing (around

focus coil)

........................

60

7A700196 Bracket, focus coil mtg (across top

7A791965 Bracket, interlock safety

of focus coil)

.....................

...........

25

05

7K700661 Bracket, picture tube rear support:

with grounding spring & 2nd anode

lead insulator

.....

............

2.00

7A792568 Bracket, yoke adjustment (across top

of yoke)

...........................

30

13

Part

Scanned by mbear2k - Jan 2012

Number
35K700532

35A700603

38K7927.73

42K471342
42A701441
42A700147

42B70721

42A76244
42A801062
42K791405
39K17396

46A478242
46K791756
46A470310

46K480256

46A70023

46A470302
46K471143
46A700090

35K792757

5K792031
5A790684
14K791892

14K87179

14A791787

4S7655

4S7688

4S9751

4S2635

2A470049

27K791404
2S7022

257004

257005

2S7003

2S7051

2S7050

2A790191

2B70703

35K702281

35K702282

35K702279

64A702001

64K791818

14

List Part List

Description

Bumper, rubber (circular bumper in

rear support bracket)

Bumper, rubber (used with RCA yokes

only)

Button, plug (covers V-6 socket hole

Cap, plate (V-19) .........

Cap, plate: with lead (V-17)....... .25

Clamp, lead retainer (dresses V-19

Clip, coil mounting (T-3 second

Clip, coil retainer (L-23)

Clip, hairpin (L-27) ..........doz .50

Connector, 2nd a no de
Contact, pin terminal (on speaker

Core, brass, & screw (T-2)
Core, brass, & screw (L-ll & L-15). .05
Core, iron, & screw (T-l primary,

Core, iron, & screw (T-l secondary

Core, iron, & screw (T-3 primary &

Core, iron, & screw (T-3 secondary) .20
Core, iron, & screw (L-23)
Core, iron, & slide adjustment

Cushion, focus coil (between coil &

Grommet, insulating: 9/32” hole.doz .30

Grommet, tube socket ..........doz .35

Insulator, coil (in T-2 can)....doz .35

Insulator, coil (in T-3 shield

Insulator, 2nd anode lead: armite

Lockwasher, int: 3/8"; cad pi

Lockwasher, int-ext: 1/4”; cad pi

Lockwasher, int-ext: #8; cad pi

Lockwasher, int: thin; 1/2” cad pi

Nut, coil & core mtg (T-l, T-2,

Nut, coil & core mtg (L-27)
Nut, hex: 1/4-20 x 7/16; cad pi

Nut, hex: 3/8-32 x 9/16; cad pi

Nut, hex: 6-32 x 1/4; cad

Nut, hex: 8-32 x 5/16

Nut, hex: palnut ; 3/8-

Nut, hex: palnut; 6-32 (T-2 shield

Nut, special: cad pi (ceramic

Nut, special: palnut (T-3 primary

Pad, cushion (around top of picture

Pad, cushion (long pad at bottom of

Pad, cushion (small pads on picture

Plate, adaptor (to adapt V-14 socket

Plate, chassis cover (removable

.............................. 05

when 1N60 used)

filament leads)

ary)

........................

leads) .....................

L-18, & L-20)

& L-12)

L-14) ..............................15

(L-27)

tube) .............................. 20

can)

(on picture tube rear support brkt) .05

(front controls mtg)........per/c .50

(7B700194 brkt mtg)

(T-8 mtg)

(7B700194 bracket mtg)........doz .15

L-ll, L-12, L-14, L-15, L-18 &
L-20)

(7B700194 bracket mtg)

(front controls mtg)

3S490459 screw)

(T-8 mtg)

cad pi (rear controls mtg)

mtg)

trimmer mtg)

coil mtg)

tube)

picture tube) ..................

tube mtg strap)

hole to miniature socket) .......

plate on chassis side)

..............

.............

.......................

...............*.....

............

......................

............................15

.................

.....

................

...................

..............

.............

.............

....... .doz .25

... .

. . . .

........... . .doz

......

....

................

......

..........

..............

.........

....

....

....doz .15

......

. . .

pi (for

....

stl ; cad pi

-32 :

x 9/16;

....

.........

.........

Price Number Description Price

15

doz .40

.05

doz .15

doz .25
doz .25

50

per/c .50

: .15

15

15

45

doz .15

per/c .50

doz .50
doz .50

doz .20

per/c

doz

per/c

doz

doz

.50

.50

.15 mounting strap)

.50 yoke adjustment) .............doz .50

.30 1X792785 Shield, coil: with spade bolts

.30 1X701853 Shield, radiation: with springs

.35 26A702497 Shield, tube (for glass 6J5)..........15

.10 1X701546 Shield, tuner: with pad

.40 from high voltage transformer)

.05 leads ........

.30 leads

64A90034 Plate, electrolytic mtg (for two

64A700690 Plate, electrolytic mtg (for three

64K700748 Plate, socket cover (covers unused

64A700745 Plate, transformer cover (for

1X700523 Plate, tube mtg: with socket & mtg

28K471323 Plug, line cord: 2-pin
9A22367 Receptacle: 5-prong (spkr recep

5S8497 Rivet: .088 x 1/8 stl; pol nkl

5S7771 Rivet: .088 x 3/16 stl; pol nkl

5S2815 Rivet: .088 x 7/32 stl; pol nkl

557706 Rivet: .122 x 1/8 stl; pol nkl

557707 Rivet: .122 x 5/32 stl; pol nkl

5S7701 Rivet: .122 x 3/16 stl; pol nkl

5S7700 Rivet: .122 x 1/4 stl; (line cord

5S7728 Rivet: .122 x 5/16 stl; pol nkl

5S6842 Rivet: .145 x 7/32 stl; pol nkl

5K71246 Rivet, shoulder: nkl pi (V-14 &

3A700198 Screw, eccentric: cad pi (7B700194

3S490822 Screw, machine: 6-32 x 1 slotted

3S490459 Screw, machine: 6-32 x 1-1/8 slotted

3S7163 Screw, machine: 8-32 x 1/4 plain hex

3S490642 Screw, machine: 10-32 x 1-1/2 plain

3S7454 Screw, sheet metal: #8 x 1/4 plain

3S7467 Screw, sheet metal: #8 x 3/8 plain

3S7453 Screw, sheet metal: #8x1 plain hex

3K790107 Screw, thumb: cad pi (deflection

26K485936 Shield,coil (T-3)

26A90301 Shield, tube: miniature

26A700717 Shield, video (shields video amp

9K700549 Socket, picture tube: 5-pin; with

9K700551 Socket, picture tube: 12-pin; with

electrolytics)

electrolytics)

hole when two electrolytics used

.

.................

25C700161 & 25K700882 transformers
only)

..........................

bracket (V-19)

tacle) . ..

(V-l, V-2 & V-5 socket mtg)..per/c .50

(mounts V-14 socket when 6AS5

used)

.....................

(9A485495, 9K780442, 9K484167
socket mtg)

(radiation shield spring mtg)per/c .50

(9K471270 socket & terminal strip
mtg)

......................

(mounts 2nd anode lead insula

.................

tor)

plug mtg) ..........

(V-19 socket mtg) ..........per/c .50

(T-5 mtg)

V-16 socket mtg)

bracket mtg)

hex head; cad pi (ceramic trimmer

adj)

........................

round head; brass (secures hi-

voltage transformer plates)....doz .15

head; cad pi (V-19 mtg brkt).per/c .50

hex head; cad pi (picture tube re
tainer strap mtg)

hex head; cad pi (tuner shield

......................

mtg)

hex head; cad pi (T-7 mtg)

head; cad pi (mount picture tube

(T-2 can)

(around picture tube)

..............

.....................

..............

...........

.................

..........................

...............

.................

......

..........

..................

..........

....

.......

............

.................

...........

.............

..................

...............

..........

.............

.............

...............

doz .35

doz .30

.10

. .20

per/c .50

per/c .50

per/c .50

per/c .50

per/c .50

per/c .50

doz .15

doz .15

doz .15

per/c .50

....

doz .15

doz .15

.......

05

.35

15

05

20

30

.65

15

95

10

.70

75

Part

Scanned by mbear2k - Jan 2012

Number

9A792167
9K780442

9K484167

9K702361

9A471343
9A485495

9K484816
9K471270

9A790685

9A480274

41A70705
41A700563

41A701851
41K702738

41K702739

41A702638

1X701097

1X701098

31K31217

31K90044

31A700148

31K471564

31K51511

31A700697

31K471565

31K37494

31A790122

31K471569

31K26658

31K90046

31A21990

24A792821
24K702048
24A792827
24K700145
451719

4S7569

451720

4S1706

4S7646

4A791447

Description

Socket, tube: min; 7-prong (V-l)..

Socket, tube: min; 7-prong (V-3,

V-4 & V-6)

Socket,

(V-7,

.........

..........

tube: miniature; 7-prong

V-8, V-9 & V-14 when 6AS5

used)

Socket,

tube: miniature (V-15 when

6AL5 used)
Socket, tube:
Socket, tube:

less adaptor

min; tan molded (V-5)

noval; laminated;

(V-13)
Socket, tube: noval; molded (V-2) .
Socket, tube: octal (all octal

sockets except V-14, V-16 & V-19)

Socket, tube: octal (for V-16 &

V-14 when 6W6 used)

...

........

Socket, tube: octal; molded (V-19)
Spring, coil (T-3)

...........

doz

Spring, grounding (grounds picture

tube outer coating)

............

Spring, shield (on radiation shield)

Spring, tension (low voltage

rectifier)

..................

doz

Spring, tension (picture tube

support) ........................

Spring, tube hold-down (around top

of low voltage rect) .........doz

Strap, picture tube mounting: with

pads (lower strap around picture
tube front)

....................

Strap, picture tube retainer: with

pad

.............

Strip, terminal: 1

3/8” spacing

....

Strip, terminal: 2

3/8" spacing

....

Strip, terminal: 2

3/8” spacing

....

Strip, terminal: 3 ins

3/8" spacing

....

Strip, terminal: 3 ins

3/8" spacing

....

Strip, terminal: 3 ins

special

......

Strip, terminal: 3 ins

ins

#2 gnd

#2 gnd

#2 mtg

#2 gnd

#3 gnd

#3 gnd

#4 gnd

3/8" spacing

Strip, terminal: 4 ins

#3 gnd

3/8" spacing ,

Strip, terminal: 4 ins

1/2" spacing

....

Strip, terminal: 4 ins

3/8" spacing

....

Strip, terminal: 5 ins

3/8" spacing

....

Strip, terminal: 5 ins

#3 gnd

#4 gnd

#3 gnd

#4 gnd

3/8” spacing

Strip, terminal: 2-screw (antenna

terminal)

......................

or
or
or

Trap, ion: PM

...................

Washer, flat: .140 x 3/8 x .030;

cad pi (mounts 2nd anode lead

ins) . . . .

..................

per/c

Washer, flat: 5/16 x .145 x .027;

cad pi (V-14 & V-16 socket

mtg)

......................

per/c

Washer, flat: 3/8 x .156 x .030 stl;

cad pi (rear support brkt mtg)pei/c

Washer, flat: 3/8 x .203 x .033 stl;

cad pi (picture tube retainer strap
mtg)

......................

per/c

Washer, flat: 11/16 x 3/16 x .067

wrought iron; cop pi (T-8 mtg)per/c

Washer, insulating (T-7 mtg)....doz

List

Price.

.2 0

.2 0

^ .20

.15
.35

.25
.40

.20

.20
.20

.15

.1 0

, 05

.50

.20

.30

1.40

1.20

.05

.05

.05

.05

.05

.05

.05

.10

.10

.10

.10

.10

.10

1 .00

.50

.50

.50

.50

.50
.15

Part
Number

Description

List

Price

4A77577 Washer, insulating (L-27 mtg)...doz .15
39A702285 Wiper, grounding (on tuner switch

assembly)

..........................

05

Insulating Compounds

11M490423 Coating, hi-voltage insulating: red-

brn (on hi-volt rect socket)

.....

11M490387 Wax, biwax (on hi-voltage trans)...

MODEL 17K1E CABINET PARTS

1X702641 Back Cover: complete with picture

tube rear cover, centering ad
justment cover, & line cord

......

3.90
1JD700605 Bezel, picture tube (window frame) 5.10
7K485464 Bracket, chassis m t g

................

10

16F702557 Cabinet, console: red-brn mahogany;

42A792193 Clamp, window mtg

less window, bezel, & mask

............

.......

doz .25

**

13K701503 Cloth, grille: eggshell & brown;

21-1/2 x 13-5/8

................

2.70

30B470756 Cord, line: with plug & receptacle. 1.50

15K792068 Cover, centering adjustment: rub

ber (on back cover)

............. ,40

1X792546 Cover, chassis bottom: with hi-

voltage insulator

..............

3.30

15B790987 Cover, picture tube rear (on back

cover)

....

.........................70

5S3139 Eyelet: .202 x .475 brass; ant cop

finish (on back cover)

....

...doz .15

5K4553 Eyelet, pin terminal (line cord

mtg)

........................

doz .20

14B792069 Insulator, high voltage (on bottom

36B790505 Knob, control (contrast)

cover)

.............................

............

20

65

36K780522 Knob, control (hold controls on

chassis rear)

......................

15

36B790506 Knob, control (station selector)... .80

36K792078 Knob, control: wal-mahog (fine

tuning & off-volume)............. .45

4S7657 Lockwasher, external: #8; cad pi

(speaker mtg)

.............

per/c .50

4S7688 Lockwasher, int-ext: 1/4; cad pi

(chassis mtg)

...............

doz .15

4S2639 Lockwasher, int-ext: 5/16; cad pi

(chassis mtg)

...............

doz .40

4S400488 Lockwasher, int-ext: #8; cad pi

62K70581 Logotype: "Motorola"

(speaker mtg)

13D701043 Mask, picture tube

..............

................

..............

per/c .50

4C

4.95

13A790824 Medallion: brs pi ("M" on grille

cloth)

.............................

50
2S7022 Nut, hex: 1/4-20 x 7/16 stl; cad

pi (chassis mtg) .............doz .15

2S7007 Nut, hex: 8-32 x 1/4; cad pi (spkr

mtg) ......,

...............

per/c .50

2S7003 Nut, hex: 8-32 x 5/16 stl; cad pi

35K792499 Pad, cushion (window mtg)

(speaker mtg)

.............

......

per/c .50

doz .30

5S7703 Rivet: .122 x 7/32 stl; pol nkl

(picture tube rear cover
mtg)

......................

per/c .50

5S6846 Rivet: .145 x 5/32 stl; pol nkl

(hi-voltage insulator mtg)

....

doz .15

3S2226 Screw, machine: 1/4-20 x 1-1/4

plain hex head; cad pi (chas
sis mtg)

....................

doz .50

3S7374 Screw, machine: 8-32 x 5/16 plain

hex head; cad pi (bezel mtg).per/c .50

3K653 Screw, machine: 8-32 x 1-1/4; cop

oxide (speaker mtg) ..........doz .20

3S7536 Screw, sheet metal: #6 x 3/8 slotted

acorn head; ant cop finish (window

& back cover mtg) ..........per/c .50

3S7509 Screw, sheet metal: #6 x 5/8 slotted

acorn head; ant cop finish (back
cover mtg)

................

. .doz .15

15

Part List

Scanned by mbear2k - Jan 2012

Number Description Price

3S490819 Screw, sheet metal: #6 x 7/8 slotted

acorn head; statuary bronze (back

cover mtg)

..................

doz .15

3S3397 Screw, sheet metal: #8 x 5/16

plain hex head; cad pi (mounts

chassis mtg brackets)

.......per/c .50

3S400220 Screw, sheet metal: #10 x 3/4 plain

hex head; cad pi (bottom cover

mtg) ........................ doz .15

35A791581 Strip, lead (dresses leads to side

of cabinet)

.................

doz .20

64K700637 Strip, trim: brass pi (20-1/2”

strip across cabinet front)

..... 1 . “ 65

4A792497 Washer, cut: cad pi (bezel mtg).doz .25
4K780040 Washer, felt (under control knobs)

.............................doz .25

4S7565 Washer, flat: 1/2 x 7/32 x .048 stl;

cad pi (bottom cover mtg)....per/c .50

61K700607 Window, picture tube: rectangular.. 6.65

MODEL 17K1BE CABINET PARTS -Same as 17K1E except:

16K702558 Cabinet, console: limed oak; less

window, bezel, & mask .......

....

**

36K792079 Knob, control: tan (fine tuning &

off-volume)

.............*.....

.45

MODEL 17K2E CABINET PARTS

1X702539

13D700605
7K485464
16F702532

55B72307

42A792193
13K700794

30B470756
15K792068

1X792546

a5B790987

5S3139

5K4553

55K700797

14B792069

36K700734
36C700732

36A485457

36C700733
4S7657

4S7688

4S2639

4S400488

13K700118

Back Cover: with picture tube rear

cover, centering adjustment cover,
line cord .

....................

Bezel, picture tube (window frame).
Bracket, chassis mtg

.........

Cabinet, console: red-brn mahogany;

less window, bezel, & mask ......

&

3.75

5.10

.

.10

**

Catch, bullet: statuary bronze (door

latch - on cabinet)

Clamp, window mtg

............

............

doz

.05
.25

Cloth, grille: mahogany & gold;

20-1/2 x 12-3/8

Cord, line: with plug & receptacle.

................

2.35

1.50

Cover, centering adjustment: rubber

(on back cover)

.................

. .40

Cover, chassis bottom: with high

voltage insulator ........

.

0,30

Cover, picture tube rear (on back

cover)

...................

.

.70

Eyelet: .202 x .475 brs; ant cop

finish (on back cover)

......

doz

,15

Eyelet, pin terminal (line cord mtg)

.............................doz

.20

Hinge, stop: semi-invisible; sta

bronze

.....................

pair

1.35

Insulator, high voltage (on bottom

cover)

Knob, control (contrast)

.........................

....

....

.20

.25

Knob, control (fine tuning & off-

volume)

........................

.70

Knob, control (hold controls on

chassis rear)

....

.15 BILT-IN-TENNA

Knob, control (station selector)... .50

Lockwasher, external

(speaker mtg)

Lockwasher, int-ext:

(chassis mtg)

Lockwasher, int-ext:

(chassis mtg)

Lockwasher, int-ext:

(speaker mtg)

Logotype: ’’Motorola"

: #8; cad pi

........

.....

..........

....

. . . ........

....

.........per/c

....

; gold

1/4; cad pi

per/c

5/16 ; cad pi

#8; cad pi

......

doz

doz

.50

.15

.40

.50
.25

Part List
Number Description Price

13D701043 Mask, picture tube

..............

4.95

13A790824 Medallion: brs pi (MM" on cabinet

front)

.........................

.50

2S7022 Nut, hex: 1/4-20 x 7/16 stl; cad pi

(chassis mtg)

...............

doz .15

2S7007 Nut, hex: 8-32 x 1/4; cad pi (spkr

mtg)

.....................

per/c .50

2S7003 Nut, hex: 8-32 x 5/16 stl; cad pi

(speaker mtg) ..............per/c .50

35K792499 Pad, cushion .(window mtg)
55K700796 Pull, door: pol brs

.....

doz .30

.............

1.60

5S7703 Rivet: .122 x 7/32 stl; pol nkl

(picture tube rear cover mtg)per/c .50

5S6846 Rivet: .145 x 5/32 stl; pol nkl

(hi-volt insulator mtg)

.......

doz .15

3S2226 Screw, machine: 1/4-20 x 1-1/4 plain

hex head; cad pi (chassis mtg).doz .50

3S7374 Screw, machine: 8-32 x 5/16 plain

hex head; cad pi (bezel mtg).per/c .50

3S7536 Screw, sheet metal: #6 x 3/8 slotted

acorn head; ant cop fin (window &

back cover mtg)

...........

per/c .50

3S7509 Screw, sheet metal: #6 x 5/8 slotted

acorn head; ant cop fin (back

cover mtg) ..............

.....doz .15

3S490819 Screw, sheet metal: #6 x 7/8 slotted

acorn head; statuary bronze finish

(back cover mtg)

............

doz .15

3S3397 Screw, sheet metal: #8 x 5/16 plain

hex head; cad pi (mounts chassis

mtg brackets)

.............

per/c .50

3S400220 Screw, sheet metal: #10 x 3/4 plain

hex head; cad pi (bottom cover

mtg) .........................doz .15

3K27913 Screw, speaker mtg

...........

doz .20

55K72308 Strike, bullet: statuary bronze;

with 1/2" steel nail (door latch -

on door)

...........................

05

35A791581 Strip, lead (dresses leads to side

of cabinet)

............

.....doz .20

4A792497 Washer, cut: cad pi (bezel mtg).doz .25
4K780040 Washer, felt (under control knobs)

.............................doz ,25

4S7565 Washer, flat: 1/2 x 7/32 x .048

stl; cad pi (bottom cover mtg)

........................... per/c .50

615700607 Window, picture tube: rectangular.. 6.65

MODEL 17K2BE - Same as 17K2E except:

'02533

Cabinet, console: limed oak; less

window, bezel & mask ............ **

55K482792

13K700795

55K700798

55K482793

Catch, bullet: brs pi (door latch-

on cabinet)

........................

Cloth, grille: eggshell & gold;

20-1/2 x 12-3/8

................

Hinge, stop: semi-invisible; brs

pi .........................

pair 1.35

Strike, bullet: brs pi; with 1/2”

05

2.35

steel nail (door latch-on door)... .05

TA-6
1X791900 TA-6 Single Loop Antenna: complete.

21R2763 Capacitor, mica: 6 mmf 300V
21R2764
24A791748

Capacitor, mica: 18 mmf 300V ......

Coil, antenna loading (on terminal

......

4.00
.20
.20

.25
24A791989 Coil, high frequency compensating.. .25
31K71393 Strip, terminal: 2 ins, #3 mtg;

3/8" spacing

...................

.05

16

PRICES SUBJECT TO

CHANGE WITHOUT

** Prices Furnished Upon Request

NOTICE

10MUM1250

Scanned by mbear2k - Jan 2012

TELEVISION CHASSIS TS-172

Scanned by mbear2k - Jan 2012

Date: 24 November 1950
Diag. No. 63E702110-0

LSI

r i i

Scanned by mbear2k - Jan 2012

5000L

O.C. VOLTAGE MEASUREMENTS MADE WITH A VTVM FROM POINT
INDICATED TO CHASSIS. CONTRAST CONTROL MAX CLOCKWISE
POSITION. ALL OTHER CONTROLS IN NORMAL OPERATING POSITION.
STATION SELECTOR SWITCH ON CHANNEL POSITION DEVELOPING
LESS THAN I VOLT NOISE AT PIN 4 OF TEST SOCKET. ANTENNA
DISCONNECTED. LINE VOLTAGE 117 VOLTS. VOLTAGES OMITTED
HAVE NO SERVICE VALUE.

A.C. WAVE FORMS AND AMPLITUDES TAKEN WITH CONTRAST
CONTROL SET FOR SIGNAL OF 45 VOLTS PEAK TO PEAK LEVE L
AT PLATE OF VIDEO AMPLIFIER. ALL OTHER CONTROLS IN
OPERATING POSITION. (DUMONT 241 SCOPE a LOW CAR PROBE USED.)

RESISTORS INDICATED IN OHMS, K* IOOO (ONE THOUSAND) OHMS.
CAPACITORS INDICATED IN MICROMICROFARADS UNLESS

OTHERWISE SPECIFIED.
INDUCTANCES INDICATED IN MICROHENRIES UNLESS

OTHERWISE SPECIFIED.

caut ion: DO NOT ATTEMPT VOLTAGE READINGS ON

HIGH VOLTAGE RECTIFIER OR SCOPE READINGS ON 6BQ6
PLATE WITH ORDINARY EQUIPMENT.

NOTES

•

----

» - w/*

------------------------------------—---------------

---------------

AJW f'1 I'

R S O I S

22K C

TRANSFORMER USE RESISTOR
25C701025-0, A a B
25C700I6 I -0, A a B
25C700I69-0, A a B

------

150/1 15 WATT

------

150 A 15 WATT

------

75 £1 10 WATT

L

Scanned by mbear2k - Jan 2012

2200

RI6

I

VI3

I2AU7

1

VERT SWEEP GEN.

EE ALSO
ETA IL 'G\

5000

C26

1000

RI8

- VARIES WITH R68

5000

C30

2200

R2I

WITH R64

I J

(

5000

C32

VI4

6W6GT

VERT. SWEEP OUTPUT

SEE ALSO DETAIL 'O '

VERT

LIN. JL

C69C

OR

C68B

TEST POINT T X

SOCKET 4 ^ w

(FRONT VIEW)

JlM F

IQOV.

VI7

6BQ6GT

■IORIZ. OUTPUT a H.V. GEN.

I50K

REP7

YOKE (HORIZ.) 38 OHMS

2700 IOOK

VI9 L24C

IB3GT

H.V. RECT.

T6 D C. RESISTANCES

2 TO 3

3 TO 4

4 TO 5

TERM.

1 T O 2

j I4KV |

RES.

1.2 OHMS
10 OHMS

9 OHMS

70 OHMS

V20

17BP4

OR

17AP4

PICTURE TUBE

PI AG. N 0 .63E70g|IQ -0

V V ' ve

Scanned by mbear2k - Jan 2012

r A 6AL5 1N60 XT*

VIDEO DET. IN PLACE

TO GRN _ Ul

T 9

---- --

TZ 5j • N

x (

f -< h “ 1

1Y 7 C37

__

(NOT USED) __

SOME SE‘

' G '

<L USED

OF V6 IN

TS

i

LI6

1 ■ V/ •

RFC

CR1

CR 1 REPLACES R46, C 5 4 ,a R47

IN SOME SETS

V7

Scanned by mbear2k - Jan 2012

6CB6

VIDEO AMR

(IN SOME SETS )

VI3

6SN7

VERT. SWEEP GEN

(IN SOME S E TS )

VERT.

' F T ' V3

Scanned by mbear2k - Jan 2012

6AG5

• I ST IF AMP.
(IN SOME SETS )

\r

V4

6AG5

2ND. IF AMR

NOTE'.-BOTH 1ST. ft 2ND. IF
COILS ( LI I a LI5) CHANGE

WHEN 6AG5 TUBES ARE
USED.

CR3

' F '

PHASE DET.

(IN SOME SETS)

VI5
6H6

a R33

CR3 REPLACES C59, R58, R59, C60, R60 ft C6I

IN SOME SE TS

SERVICE MANUAL SUPPLEMENT

Scanned by mbear2k - Jan 2012

(S UP PLE M EN T TO T S-1 72 SE RVICE MA NUALS 54P702174 & 54P702191)

CHASSIS

TS-I72A

NO TE: T his S erv ice M anual sup ple me nt con tains sch em a tic

diag ram & sup plem en tary pa rts list co ve rin g the T S-17 2A
TV c ha s sis . Align m ent data, s e rv ice ad ju stm en ts , etc. ,

fo r this ch a ss is are id en tica l (with the e xce ption show n b e 

low ) w ith that for the TS -17 2 and w ill be found in the T S-17 2
Se rv ic e M anual, P art N o. 54 P702174.

CHASSIS T S-17 2A - Sam e as TS-1 72 ex cep t test s ock et w ir 
ing rev is ed .

REV ISE D HO R IZ ON T AL OS CIL LA TO R A DJU STM EN T

(F O R T S-1 72A )

The H orizo nta l Hold co nt rol shou ld hav e a sy nc range of ap
pro xim at ely 180 d eg re es . If the co nt ro liis too c rit ica l, ad

ju st as fo llow s:

1. Short out H orizon ta l O scilla to r c o il L - 23 . T his m ay be
done by sh orting the 2 pins of the rec ep ta cle (te rm in a l s trip
in som e sets) on top of the c ha s sis .

2. With the c en terin g lev e r, m ove the p ictu re to the left
so that the righ t edg e of the r as ter can be see n. A d ju st the

H orizo nta l Hold co n tro l to about the m idd le of its ra nge and

note the width of the bla nking pu ls e. (T he blank ing pulse
app ear s as a g ray b ar at the righ t edge of the pic tur e).

3. R em ove sh ort fr om H orizo nta l O s cilla to r c oi l.

4. A d ju st H orizo nta l O scilla to r c o il until the sa m e am ount
of b lan kin g pu lse can be seen as was noted in Step 2.

REPLACEMENT PARTS LIST SUPPLEMENT

NO TE: When o rd erin g p arts , sp e cify m od el and ch a ssis num ber of s et in addition to part n um ber and d esc rip tion of p art.

The follow in g pa rts are re pla cem en ts for o r additions to, the or igin al item s lis ted in the T S-1 72 S er vice Ma nuals (p art nos .

54P7 021 74 & 54 P 70 2I9 1)

Ref.
No.

Part
Number

CHASSIS PARTS

Resistors
R-105 6R6326

Transformers
T-1

1X702893

Description

ELECTRICAL

100 10% £W

............

Mixer IF: with cores & mtg

nuts (when 6AG5 used in

IF’s)

....................

List

Price

doz 1.20

.85

Ref.
No.

T-2

Tubes
V-5 6AG5

Part
Number

1X703335

or 6CB6
or 6BC5

Description

3rd IF: with core, mtg nut,

C35, & colored leads (when

Xtal used as detector)

....

m

3rd IF amp

List

Price

1.25

4545 AUGUSTA BOULEVARD &rftC. CHICAGO 51. ILLINOIS

PART NO. 54P7 10250 Price 10 Cents PRINTED m u . S. A.

PR IC ES S UB JE CT TO CH AN GE W ITH OU T N OT ICE

BOTTOM VIEW OF CHASSIS

Scanned by mbear2k - Jan 2012

1*0

L -18 a L-

CONNECTK

300 OHM

LINE

0- •'

d

i

C—

B—

STATION SELECTOR

SWITCH

SI

U S

NOTE!-STATION SELECTOR SWITCH SI
SHOWN IN CHANNEL NO. 2 POSITION.

0 « IRON TUNING CORES,

t « BRASS TUNING CORES.

Tl CONNECTIONS

.

______

.12 AT 7

| 2.5V I MIXER | 105V. | § g

» L i L r . i— — i t.

______

P C ?

" \ I 1 i ^CH*

SEE ALSO

DETAIL

*E*

V3

6AU6

__

1

1ST. IF AMP

M o to r o la

Scanned by mbear2k - Jan 2012

TELEVISION CHASSIS TS-172A

Diag. No. 63E702144-0

LS I

D.C. VOLTAGE MEASUREMENTS MADE WITH A VTVM FROM POINT

Scanned by mbear2k - Jan 2012

NOTES

INDICATED TO CHASS'S. CONTRAST CONTROL MAX CLOCKWISE
POSITION. ALL OTHER CONTROLS IN NORMAL OPERATING POSITION.
STATION SELECTOR SWITCH ON CHANNEL POSITION DEVELOPING
LESS THAN I VOLT NOISE AT PIN 4 OF CONV. SOCKET. ANTENNA
DISCONNECTED. LINE VOLTAGE 117 VOLTS. VOLTAGES OMITTED
HAVE NO SERVICE VALUE.

A.C. WAVE FORMS AND AMPLITUDES TAKEN WITH CONTRAST
CONTROL SET FOR SIGNAL OF 45 VOLTS PEAK TO PEAK LEVEL
AT PLATE OF VIDEO AMPLIFIER. ALL OTHER CONTROLS IN *
OPERATING POSITION. (DUMONT 241 SCOPE 8 LOW CAP. PROBE USED.) » v-

RESISTORS INDICATED IN OHMS, K*IOOO (ONE THOUSAND) OHMS.
CAPACITORS INDICATED IN MICROMICROFARADS UNLESS

OTHERWISE SPECIFIED.
INDUCTANCES INDICATED IN MICROHENRIES UNLESS

OTHERWISE SPECIFIED.

ca u tio n : DO NOT ATTEMPT VOLTAGE READINGS ON

HIGH VOLTAGE RECTIFIER OR SCOPE READINGS ON 6B06
PLATE WITH ORDINARY EQUIPMENT.

TRANSFORMER USE RESISTOR
25C70I025-0, A 8 B
25C700I6 I -0 , A S B
25C700169-0, A 8 B

------

150/1 15 WATT

------

I 50 A 15 WATT

------

75 XI 10 WATT

Scanned by mbear2k - Jan 2012

Dl AG MO 63 E 7021 44-0

T V ' -

Scanned by mbear2k - Jan 2012

TO GRN .

6AL5

VIDEO DET.

T2 51 ^

(NOT USED) _

XTAL USED IN

PLACE OF V6 IN
SOME SETS

J , l_ E l

i

IN 1

1

RFC

6

C37

LI6

VERT. SWEEP GEN.

(IN SOME S E TS )

'C'

Tl

Scanned by mbear2k - Jan 2012

MIXER

IF

V3

6AG5

I ST IF AMP.

(IN SOME S ETS)

V4

6AG5

2 ND. IF AMP.

1500

C24

n o te :- t i , li i a l i 5 c h a n g e

WHEN 6AG5 TUBES ARE USED.

VIS
6H6

PHASE DET.

(IN SOME SETS)