General Electric Co. 160 Schematic

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Manufacturer:General Electric Co. (Old RCA)

Schematics Content:

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Page 1:

GE PAGE 19-17
Height _.,. ..__ 1 o % in.
Weight ...,
Charging from A-C Uno:
17 pounds
Voltage.. _ _ ..._ _ _ 105-125 volts
Frequency. _ _ _ _ _ 50/60 cps
Wattage _,,.____._,.__, . ,,__ 10 watts
Oparallng from lnhmul lenory.
Current _..._.___.___,..__.___,.
Wattage ______,._.______,..____
Hours of Operation without
` Charging Battery _,,___ ____.
2_1 volts
1.7 amp
3.6 watts
_ Approx. 12-15 hours
Willard 2.0 volt No. 25-2 rechargeable battery or equivalent
Broadcast Band ...,.,.___ ,______
I-F Amplifier ...,, _____._ _____
Power Output (at 2.1 Battery
Maximum .___ __._ 1 10 milliwatts
Type ._,,,.___,.__,
Outside Cone Diameter ._.______,
Voice Coil impedance (400 CPS). .3_2 ohms
' R.F Amplifier __.___,_ __,, T ype IU4
I-F Amplifier ________.. ___, T ype 1U4
I Detector~1st Audio. _ _ .___ Type 1S5
Audio Output .....___ ____ T ype 3V4
The Model 160 Portable Radio is a five-tube superheterodyne
broadcast receiver which operates from a built-in rechargeable
battery or from 105-125 volts, 50 or 60 cps with a battery in
The following paragraphs describe special tests for checking'
the power supply and the battery of the receiver, and explain
some of the special_constructiona1 features which will be en-
`countered while servicing the receiver.
All power necessary for the operation of the receiver is supplied
'by the 2-volt rechargeable battery mounted within the radio.
Power to the 1,4 volt tube filaments is supplied by the battery
through suitable voltage dropping resistors. The high voltage
ifor the screens and plates of the tubes is furnished by a syn-
chronous vibrator used in conjunction with a step-up power trans-
former and its associated filter circuit. The synchronous vibrator
operates directly from the battery.
The receiver power is obtained from the battery at all times in
the manner just described, whether the power cord is connected
to a power source or not. When the power cord is connected to a
receptacle supplying from 105 to 125 volts, 50 or 60 cps, a-c and
the power selector is in either the CHARGE or ON position, the
power supplied from the line will be used to charge the battery.
The CHARGE position on the three-position power selector
switch allows the battery to be charged from the house current
when the receiver- is not operating. The ON position of the switch
permits the radio to be operated with the battery iioating on the
charger. Under this condition the battery filters the charger's
output, maintains the voltage at its proper value and acquires a
slow charge, if the voltage is adequate.
The battery charging unit consists of a step-down transformer
which converts the line voltage of 117 volts to approximately 5.8
volts center-tapped, and a full wave copper-oxide rectifier which
supplies the battery with the d-c charging current.
A charging cable is available which provides an easy means of
charging the radio battery from an automobile or a 6-volt storage
battery. The cable plug is inserted over the pins provided, see
Figure 3, and the plug and socket on the other end of the cable
are connected to a 6-volt supply. Complete installation instruc-
tions are provided with each cable.
Testing the Operation of the ReclU'ier Unit-A $4 ampere fuse
is used in series vnth the primary of the charger transformer. If'
the battery does not show any signs of becoming charged after a
reasonable length of time, check the fuse. If it is necessary to
replace the fuse, use a %-ampere (G.E_ No. 2548 or REF-001) fuse.
If one or more of the copper-oxide discs of the rectifier unit
are defective, the charger will not operate properly. To test the
rectifier unit operation, remove the battery from the unit and re-
connect it in series with a d-c ammeter capable of reading at
least two amperes. Plug the power cord into a 105-125 volts, 50
or 60 cps, a-c supply, and turn the power selector switch to the
CHARGE position. With the a-c line voltage at 117 volts, the
average charging current should read about 1.8 amperes at 2.1
volts battery voltage. Care must be exercised in making this test'
as the charging circuit is of extremely low resistance. Very heavy
leads must be used, and the use of an ammeter having only 0.05
ohms resistance will introduce considerable error. If the line
voltage is greater than 117 volts, or the battery voltage is lower
than 2.1 volts, the charging current will be greater. If the current
is much less than 1.8 amperes at the rated line voltage of 117 volts,
one or more of the copper-oxide discs may be defective.
Testing the Individual RectMer Disc-Two rectifier assemblies.
are used in the receiver, each assembly consisting of two rectifier
discs held together by an eyelet. A cross section of a rectifier as-
OO \ ill
(C)John F. Rider

Page 2:

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

Page 3:

PAGE 19-18 GE
2 onus aecrurlza main o;h;l;h;asi| out of the cabinet, being careful not to
UNDER "ST 4. fl?llnscrew the three screws at the bottom and one on the
_ _ i top o e power unit.
2 ? V _ 5. Lift up the outer shield and then replacement of the
'ELL vibrator is as easy as changing a normal radio tube.
0-2 -1- M The receiver uses a 2-volt Willard Radio Battery No. 25-2 or
equivalent. It has a 25 ampere-hour capacity and should be cared
for in same manner as any storage battery.
um ,_ |",m" yu, dm," The degree of charge of the_battery can be determined by
sembly is shown in Figure 2. The center plate of the assembly is fagzni the *z=??<3'1?f ?f;ht;'?:"i' ?f'dt;l?f"'i"3lt\"; the char" ban
positive and is provided with a soldering tab. A coppenoxide m I; ihfsbifg ? . ';_"? lf ?c; m ?f";F? "tery ?"F'
rectiher disc is located on each side of the center plate. The _ .bl t th rv " 'Fi "fi .' t}?:'?1:" 'Cam' bam "ll be
rectifier disc conducts when the proper polarity potential is>>ap- 2" 5.8 h ? 'angie ? b 5 .usp m t 'auabtcry' when th" bi!"
plied to the copper>>oxide surface. The copper oxide is_ a dark thzyf f"g??'d f" R "1 '?"?" W' ?'"k and d'"PP??' '"
coating which has been plated with nickel to afford a good surface I ? ?)rwmg.?;." . ka h _ I
contact to the copper oxide. If either or both of the rectifier discs bat?e cgez?x "if ?';;m diwhm a?P'?*"""? Y 2? P" ??'" ?f
|in an assembly become defective, the entire assembly should be 2 ryrh P y 13% ken 'C "ge ' . .
nPllced_ . h e reg bg l sin vs whera battery is 80 per cent discharged.
To check the rectifier assembly, the following tests are recom- gi" c arse' b: tan' ns' gf tae r?v"".?rd" md .the
mended. ln the conducting direction, the rectifier assembly should "ge may S ?PP?d W ?" 5 | HPPNI' In the opening.
pass 0.5 ampere or more when M volt is impressed across it. If
a d-c ammeter is not available for measuring currents as high as r? duke! 'Array _ _
0.65 ampere, the circuit shown in Figure 2'can be used for this The bH???fY W Ch*\1'S?\?f?lY 4llCh8l'8?d bB\ff?l'Y w\1lb? \'?!f?l'?d-
described for current check, disconnect the voltmeter, and place "FUNNY Wlfhm 10 tv 30 h?\lf`3~
a milliammeter that will read 10 ma. in series with a lead to one Wh" ?P?fflY"}S the l"?C?1V?l' fl'?1'h fh? 8-C lwllk Cllrrdlt. the
of the battery ten-ninals. A suitable meter fuse should be used in bmtfy HOHH ?r \s_b?ms charged at a slow( rate- Thus if you wish'
series with the milliammeter to prevent damage to the meter in ?? ?P?"?f? th* f???lV?f ?V?n Wlfh B WHY d\9Ch31'8?d \7Bff?\'Y>> PNK
ease the assembly under test is shorted. The reversed current 1" UN P?'*Y?\` C?fd in UN IF_l'?C?PfBCl? and ?\lf\'1_fh?_P?W?\'
should not exceed 10 ma. If this current is considerably above this "l?C*?|' "\"\?h f? Pl" ON P?S1U?\'l~ Pf?\?nB?'3 f7P?f3U?" fn fbi!
v.}"?_ thg ,-??t?5?|- uumbly ,hould be din"-d?d_ manner usually willvcause the battery potential to stabilize at
If a milliammeter is not available, a rough check may be made '?"'? "?l'~"EUR? d???"mP?d_bY Y-VIC line VDRBEC and UIC Chf\r8Ct?ril-
by measuring the resistance ofthe assembly in the non-conducting UQ* vf "W _CHHIEQHK ?11'C\l\t C0mP??l?f1?S~ Th! lf-\=Bf?? ?f ?hBl`l? Ob-
direction on the low resistance range of an ohlnmeter. The resist- fmnlfble Wlth th" method ?f ?P?f8?l?[\ \lk?W1l? IS d?P?n??!1? On-
"-,?? ,h?u1d mmgm-? at lea" 300 ?hm,_ the line voltage and the characteristics of the charging circuit
after many hours of service,_ the reception might become very "WHY ?'3|"~? |N$7l||?T|?N5-
noisy or 23 :0 a faulty vibrator. The type used in this re- f 1. Add distilled 0; tap wagr in :he filler cap at sufficiently
ceiver is - . requent intervais to eep liqui leve at' dicato ark ` wed
, In order to gain access to the vibrator, proceed as follows: through opening in battery case. Do noinoverfili-2; thi:'i2;airs
l. Pull out the pins on the handle of the cabinet (Figure 3). the nonspill feature. Distilled water is to be preferred, as it does'
2. Unacrew the tive hex screws which hold the chassis in not contain any chemical compound which can contaminate the
cabinet (one screw at the bottom of cabinet). battery.
ro remove aarrenv \ (C) (C)' FUSE, ro mms
carcass @ / (C)
woven unnr
svow PINIER com
gg; nu usa: warn
nzx screw no 2 igg? my IN use
@ SLSLNLQ L --ner screw non
o John F. Rlder

Page 4:

2. A fully charged battery will operate the radio in the ON
position without being connected to an a-c outlet for about 12 to
15 hours before recharging is required. Whenever possible, it is
best not to allow the battery to become discharged to the extent
that both indicators disappear. However, if both indicators have
sunk, the battery should be recharged immediately or within 24
3. A battery will continually discharge at a slow rate even
when not in use. For this reason, monthly checks should be made
of the charge condition and the battery placed on charge when
necessary. This will prevent damage to the battery, such as freez-
ing during cold weather.
The following instructions should be carefully followed in in-
stalling a battery, or replacing an old one:
1. Remove battery from packing carton.
2. If needed, add water to bring liquid level to indicator
mark on battery container. Do not overfill.
3. Raise back cover on radio, remove battery case cover. The
latter is removed by lifting two catches.
4. Unplug old battery if present, and replace with new
5. Place battery on cbarge,if necessary, as described in a
previous paragraph, until both indicators are showing in the
opening in the case cover.
1. Signal generator with audio tone modulation.
2. A-C output meter, 1 or M volts full scale, 1000 ohms/volt.
3. Insulated screwdriver.
5. Antenna loop.
6. Shorted one turn loop (for "wanding").
7. Powdered iron cores.
1. General-The alignment procedure is given in table form
for convenience. Reference is made to Figure 5 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 connected as indicated in the Alignment Chart. A meter or
some other suitable indicating device must be connected to the
output of the receiver.
When aligning the receiver, the volume control on the receiver
should be turned to its maximum position. The output signal of
the signal generator should be kept as low as possible at all times,
on this mounting plate, it is necessary to ground this plate tem-
porarily to the chassis by means of a metal strip or wire to avoid
excessive hum.
For the r~f alignment, the chassis can be left in the cabinet and
the output meter connected between the auxiliary green voice
eoil lead provided and chassis.
3. Connecting the Szhnal Generator-After aligning the i-f
transformer T3, the output of the signal generator shouldbe coupled
through a 0.05 mf. capacitor to the grid of the 1R5 oscillator-
converter tube. This may he accomplished easily by connecting
the capacitor to t.he stator of C1-B,the middle section ofthe tuning
gang, as this stator is connected directly to the converter grid.
The low side of the signal generator output should be connected
to the chassis ground to complete the circuit.
For aligning the oscillator and r-f coils, the r-f signal should be
inductively coupled by connecting a three- or four-tum, 6-inch
diameter loop of bell wire across the signal generator output
terminals and then locating the loop about one foot from the radio
cover. To prevent possible error in peak readings, the position
of the loop with respect to the receiver should not be changed
during any one set of adjustments. The adjustment of the iron
cores must be made with the cover opened, and during the reading
of the output meter the loop must be in normal position (the cover
of the receiver must be closed). `
For the oscillator adjustment, it is advisable to use the method
of "wanding" the radio loop antenna. f'Wanding" is the pro-
cedure where more or less gain will be indicated by an increase
or decrease in output meter readings when a shorted one-turn
loop (approximately 10 in. by 5 in.) is coupled to the radio antenna
loop. If a gain is indicated, we have to increase the inductance
by screwing in the iron core of the oscillator coil.T6. In a similar
manner, a field of powdered iron cores may be coupled to the
loop. In this case a gain would indicate that the oscillator
inductance must be decreased. When no gain is apparent with
either the shorted tum wand or the iron field wand, the adjust-
ment of the oscillator iron core is peaked.
After the alignment of the oscillator, the r-f transformer T1
should be aligned as follows:
1. The signal is fed over the loop coupled to the radio antenna
loop with cover closed. Note the output meter reading.
2. Open the back cover and tum the tuning slug of T1 approxi-
mately M tum clockwise.
3. Close the back cover and note the new output meter reading.
If it has increased, continue to tum the core in the same
direction; if it has decreased, reverse the direction. Repeat
this procedure until a definite maximum reading is obtained.
the reading of a meter connected across the voice coil leads of the ,ALIGNMENT CHART
receiver should be kept below M volt by changing the signal gen-
erator output. If the signal level is too high, the AVC becomes Tesboicilhtol, 1-"U Painter Adjuit for
effective and alignment errors might result. step Connnmd to. oscmator Setting Maximum
The following paragraphs give greater details regarding the setting output
connections 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. A rectifier type a-c meter of 1 or 1% volts full scale I giagnaggrxhfglln 455 KC gggggxc ::::';g:,:?:EUR|-at
deliection is connected across the speaker voice coil terminals. with 0_5 mf Condcm"
For alignment of the i-f amplifier, the chassis and t.he back cover capiciton open)
have to be r?moved from the cabinet (see paragraph 3 of General
Information . 1 R5 - K 0 -_
_ In order to be able to tune the i-f amplifier with ease, it is Epi" 455 C is-ggxc ?:::,;?::1:?2r
advisable to unsolder the two leads connecting the loop antenna, _05 mf mpadm,._ mndmm.
and solder them together avoiding any undesirable shorting ' open)
to ground. Now remove the four self-tapping screws holding the
speaker mounting plate and slide it out to gain access to the inside 3 'Rs ~ K 1 0 R k T d
of the chassis. Due to the fact that the rectifier discs are mounted (pin 455 C (gaglxc 1-gpea 3 an
.05 mf capacitor. condenser
""` "_, 4 lnductively coupled 580 KC 580 KC Iron core of TG'
~ ~~ \? , to loop antenna.
.M -, .' i ?'""" 5 Inductively coupled 580 KC 580-KC Iron core of
?,,, ' to loop antenna. Tl"
'?' \' 6 Inductively coupled 1500 KC 1500 KC CSB, CZB, and
us to loop antenna. C1B"'
`"'_;\1A;_ "' '*" "" 7 Repeat Steps 4, 5, and 6 until both peaks reach maximum.
"'f,"{",?',";,"S,{;},,,,_ _f;",,,",?L,?,}",,",',2$,;,,,, .:Use "Wanding" method described in text.
"""""?"""'"?"?' "?Chasais in cabinet and cabinet back (with loop) closed;
Nl- 4- 3041" V?||lQ_!?ll|'l remove plug buttons to adjust trimmers.
o John F. Rider

Page 5:

PAGE 19-20 GE
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
pacitor in series with the meter ..... ,... _ _ ....... 3 volts
(With the line cord plugged in; with battery operation alone,
the voltage thus measured will be negligible.)
have tolerance of 20%.
R-F Amplifier Grid (IU4 Pin 6) to Oscillator-
Converter Grid (IRS Pin 6) .,............. 13 at 1000 KC
Oscillator~Ccnverter Grid (IRS Pin 6) to I-F
Amplifier Grid (IU4, Pin 6) _ _ .,........_.. 26 at 1000 KC
Oscillator-Converter Grid (IRS, Pin 6) to I-F
Amplifier Grid (IU4, Pin 6) ...... ...__... 3 1 at'4S5 KC
The power output across the speaker voice coil should be
approximately 50 milliwatts with a' 400 cps signal of .03 volt
applied across the volume control.
The d-c voltage developed across the oscillator grid leak
(Resistor RZ) averages 13 volts at 1000 KC.
Fig. 4 shows typical tube pin voltages. All readings should
be made from the pins to ground unless otherwise indicated.
Across the primary of the output transformer
T4 measured in series with I mf paper ca>> ?'?"""'?'?"""'
I Hg. 5. Tube and Trhnmor Loeullon
UCC-625 co, 17 CAPACITORf.D05 n-rf., 400 v., paper RHG-019 GROMMET-For battery box .,,_
r UCC-630 co, iz, 13 CAPACITOR-.ol mf., ooo v., paper RH1~ooo HINGE-Door hinge .... _
UCC-631 Cll, I6 CAPACITOR-.02 mf., 400 v., paper RHQ-ooz VENT 'l'UBE>>For hmery_ _,.,_ _
UCC-oss C4, ls, za CAP/lcl'l'0R-.os nrt., 400 v_, paper RHS-010 TUBE SHIELD-For ISS tube
UCU-uzs cv, E, 10 CAPACITOR-100 mmf., mica _ _ _ RHS-als SHIELD-Spirnl nhleln .._____ _ _ _
URD~049 R16 RES1STOR-l000 ohnu, ig w., urban RJP-014 PLUG-Bnuery plug. _ _.___.___,__ _
r VRD-057 R15 RESISTOR-2200 nhrne, 34 vr_, carbon RIP-026 PLUG BUTTON ______. _ ______,___
URD473 Rls, 14 Rl;SISTOR-10,000 ohms, 54 w., ur- R15-091 sQCKET>>Tnbe socket :hook rnourn-
I URD~o97 Rl REsls'l'0R-100,000 ohnn, if w., RJW-ooz HOLDER>>l-`noe holder _.__._ ___._.
URD-lzo R6 RESISTOR-2.2 meg., 5 w., carbon forrner_ ._ ______._, _ ____ __ _
URD-133 Riu RESISTOR>>-3.3 meg., 5 w_, carbon RLF-ol4 L3 CHOKE-B+ Hlter choke. ____.__
URD-ls7 R8 RESIS'l`0Rf&_7 meg., 5 uv., carbon RLY-O15 L4 Cl-10KE>>-A+ alter ?hoke___ ._
hon ____ _ _ .________ _________ R LL-032 Ll LO0P~An?ennn loop ._____ __ __ _ _
RML-olo LINK-Link for lever.. _____ __ _ _ _
' Rlvn.-uzo LEVER-Lever for "meh nontrol ohm
RAC~0s3 COVER-Emery box cover ._._ _ RML_oz1 LEVER-Lever for volume control ____
RAD-oss DOOR-Cabinet door ____ _____ R MM-082 RUBBER CUSHION-For battery box
RAG~Dl7 GRILLE-Loudspeaker grille _ _ _ _ eover _._.________._.__. _ _ .._.__.
RAU-om r:AaxNE1~fm.roen_ __._____ _____ R MP-on Piufnnnole reuinini pin ._.._.__. _
KBC-001 B1 CELL-Bill cell. _ .._._ _ _ .__, _ _ _ RMS-120 SPRINGfDriYe cord Flin( _ _ _ _ _ _ _ _
RCC>>090 Czz CllPACI1'0R~_003 mfi., lsoo v., nnper RMU-044 SHAFT-shift for switch ____
RCT-034 CAl>ACI'l'0R~'l'nning capacitor _ _ _ _ RMW_o27 PULLEY .' ___.________.__.__ _ _ _ _ .
I RCW-1060 Clo CAPACITOR-10 mmf.. ceramic ____ RMW-077 WINDLASS .__________._____._____
RCW-1075 cs CAPACITOR-4 mmf., ceramic _ _ RRC-092 R7 VOLUME CONTROL-_5 meg.. r. _ _ _
RDC>>03Z DRIVE CORD-25 ynrdn _____ ____ _ _ _ RRW-018 Rs, 4, 5 RESISTOR-7_5 ohrnr, virewonnd. _ _
RDK443 KNOB~K.uob volume nnn rwlxeh ____ RTL>>0S2 T2 TRANSFORMER-lntl-Fzrnnnfornier
I RDP-041 ASSEll$BLY-Slider and pointer nn- RTL-os4 rs 'l`?ANSFORMER-2nd I-F unne-
REV~001 vi vlBRA't6R-vlhrneor unit _____ RTO-055 T4 TRANSFORMER-Output rrnnnforni-
( REX-ool l1EC'tIl-'IER-Dine rectifier ___._ er ._______._____._____ _ _ _ _ __
RHC>>01J HAIRPIN COTTER _______ _ ._._ RTV-003 T7 TRANSFORMER-vlhmor inno-
RHE-ooo EYELET-For handle .___.__._____ former ____ __.____ _ ._____._.__._.
RHG>>0l8 GROMME'l'~Ruhber gornrne?__.. RWL-009 POWER CORD. ____.__

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osx; some
(C)John F. Rider

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