Eico HF-14 User manual

14 WATT HIGH FIDELITY POWER AMPLIFIER
MOD E L
H F·14
A
INSTRUCTiON
MANUAL
TRDNIC
NORTHERN
E L E C
330 D
INSTRUMENT CO.
BLVD., l. J. BITT
Iffw- •• £,,1', :7""
OT -A :F. ~.> W •.
'/UI"nl'A' .>'Y.
W. f!A,,;,t "II( ~~.. ...+-
INC •
". 1.

general description
GENERAL
The EICO HF-14 Isa 14 watt high fidelity basic power
amplifier employing two EL84output tubes In push-pull
and a high quality output transformer. The high power
sensitivity
of these remarkably fine tubes eliminates the
necessity for additional driver stages, permitting the use
of a large cmountofinversefeedbackwlth QhighstabiHty
margin. The lower
operating voltages required and the
use of EZS1 rectifier tube having (I warm-up characteris-
tic exoctlymotched to the output tubes, result in a power
supply of exceptional reliabilityas well as extended out-
put tube life. Filter electrolytlc.s and the rectifier oper-
ate well below mQKlmum ratings and voltage surges at
starting are eliminated.
The HF-l4 has been designed to maintain Its excellent
SPECIFICATIONS
.
Rated Output Power: 14 watts continuous, 28 watts peak.
chClJ"Qctertsti~ under speaker load(Including electrostatic
types) as wellas the resistive load normallyused for test-
Ing. Phase eerreetlens have been provided at both ex-
tremes of the audio spectrum to insure stability under all
conceivable eendltlens and to insure that variations in
components
and constnJctlon wiII not affect the perfor-
mance. Stability is maintained on all speaker taps with
loads rongingfrom zero to infinity. Overload character-
istics are excellent and the HF-14will notexhlbit bounce
or flutter under pulsed conditions.
The
HF-14can be operated from any premlpllfier control
unit. A power
take-off socket is provided for powering
the EICO HF-65A.orHF-61Apreanplifier control. Other
features include apanel mount fuse holder, switched and
unswitched convenience outiets, and heavy gauge cad-
mium plated steel chassis finished in baked enamel.
1M Distortion (60cps & 7kc at 4: 1): 1.7% at 14 watts, 0.33% at 26 watts, 0.1% at 4watts.
Harmonic Distortion: 8watts less than 1% from
30c to 10kc.
10 watts: less than 1% from 40c to 10kc.
14 watts: less thCl"l 1% from SOc to 5kc.
20c distortion: 2% at 4.2 watts.
Transient Response: excellent square WeNe reproduction (4usec rise time); negligible ringing, rapid settling on IOkc
square wave.
Invene Feedback: 20db
Stability Margin: 12db
Damping Factor: above 8,
20cps to 2Okc.
Sensitivity: 1.2S volts for 12 watts
output.
Hum: 90db below rated output
Speaker Connections: 4, S, and 16 ohms.
\
Tubes: 1- ECc83/12AX7, 2- ELM, 1- USI
Power Source: 117 volts, 60 cps.
Power Consumption: 65 watts
~ HWD: 33/4
11 x12" x
4".
Shipping Weight: 101bs.

mechanical In.hlilation
GENERAL
0) HEAT DISSIPATION (VENTILATION), Ineemecnwlth
,9ther electronic equipment; the Model HF-14prbduees a
gr8c;rt deal ofhed I" normal operation. Unle .. conttn~
uous and adequate air- flow I, obtained around the heat
pr'Oducfngelements,these.elementswill overheat andtheir
usefulllfewlUbegreatlycurtalled. Adequateventllation
will be provided I' the ampllfler·I, JrlItOlledln CIl open-
backconsoleprovlded,that thetopafthe ~ltfJer Ii spac-
ed at lealt two Inchel'belbw any ,h.lf mounted aboVe it.
if the cabinetis enci~ed at the rear, provide several large
hoI
.. or slots eli low clown and as'high'up In the cabinet
back
CIS poalble. AI ~ altemate, hoi. may be provided
Inthe sid., bottom,or top of the cabinet. Thelmportant
thing to remember Is that effective ventJlatlon requires
provisionfor cool oir to eriter at the bottom and to leave
at the top. . ._.
If the ampUfier Is not Installed In a console, It should be
situated preferably on.an open surface. An attractively
ftni.hed matchIng cover forthe Mod.1 HF ... 14 is available
which will provide a "flnllhed
lt
appearance as well CIt
protection when the amplifier itnotlnstalled In a console.
Four rubber feet are also provIded 10 that the amplifier
will not mar the suri'ace of fumiture on which it is placed.
b) ACCESSIBILITY TO PARTS: Tubes are tho moot fre-
quently replaced Items In electronic equipment. If the
amplifier II placed in a console, sufficient space should
be
allotted to reach and remove ony tube In the ampli-
fier. Furthermore, Input and output terminals of the am-
plifier should be accessibl. to permit e<lSy interchanging
of system components far comparison. If antennas are
strung around the back of the console In which the ampli-
fier is Installed, arrange them so they will not interfere.
c) ELECTRICAL ISOLATION: To realize thefull benefit
of having apower ampllfl.r physically separate from the
preampllfJer'"'COi'ltrol unit and/or tuner, the power ampll..
fter should be placed at least one foot away (more ifpos.
sible) from either or both of these units. '
d) ACOUSTICAL ISOLAnON: If ampun., and speake,
are Install.d In the same cabinet, provide sufficient sep-
aration to minimize mechanical speaker vibration reaching
the amplifier. The minimum separation Is about onefo:ot.
CONSOLI MOUNTING
Having determlned a proper location for the OffFlifler In
the partlcularconsole, the correct procedure for mounting
the amplifier chaaiJ bas follows:' a) If the rubber feet'
have been imerte<! in the bottom plate, remove them (pry
out with a thin screwdriver). b) Remove the 6 sc~
which fastenth. bottom plate to the chassis., c) Place th.
bottom plate (bumps facing up) at the location on thuhelf
or other mounting surface In which It is de.lred to mount
the amplifier. With asharp pencil, placed with its point
directly agaInst the edge of the lower surface of the bot-
tom plote, draw the outline of the bottom plate on the
shelf and also marie the positions of the four outer holes.
d) Remove
the bottom plate and drill each of the marked
holes an. the shelf to a diameter of 1'4". e) Refasten the
bottom plate to the chassisl with 2 8 x 3/8 screws pre-
viously removed, using the holes at the center. f) Re-
place the chouls on the shelf, positioning It exactly In
the outline previous!y drawn. 9) From the bottom side
ofthe shelf, insert a'B x l"screw with a 1/2
10
flat washer
against the head through each of the four holes. These
screws engage thestarnped nut over each hole In the chouls
flange and when tightened secure the chassis to the shelf.
electrical in.tallatlon _
POWER
A)
POWER REQUIREMENTS, Ihe EICOMcxleI HF-14 re-
quires 65 watts at 110 to 120 volts, 60 cyeles AC.
b) REMOTE SWITCHING, Tho EICO Model HF-14, al-
though not privlded with its own ON-OFF power switch,
lIasp1oyislon faa lemoleswltchhly,llllwgl, OIloclol socket
mounted on the chassis. Pins 6 and 70f the octal socket
are Internally connected to the ends of abreak In one
power transformer primary lead mid are externally con-
nected togetharbya [umper In a mal. octal plug Inserted
In
the cetelseeket, WhM this male plug is removed, pins
6and 7 may be brought out to an external AC switch,
usually in a preamplifier unit. This Is oneofthe connect-
Ionfunctions accomplished with the octal plug-and-cable
attached to the EICO HF-65A and HF-61A preamplrner-
control unit. If the HF-14 power amplifier Is being wed
with a self-powered tuner-preampllner, the octal fur-
nished with the HF-14remains Inserted In the octal socket
(to connect the primary of the power transformer to the
AC Ifna and 10ground on. side of the filament winding)
and the line cord « the HF-14 is Inserted in a switched
117VAC
convenience outl.t In the control unit. Note:
When using aself-powereel preamplifier-control unit,
touch one end of a wire to the preampl1fier chassis and
the other enel; at the pewer amplifier ehessls. If Qsperk
a) POWERING AUXILIARY PREAMPLIFIER, The .ame
octa.lsock,t provldn QII neconaty filament and B+ vel-
ta;elfor operatln; an CIIxIIIQ"Y preomplifl.r"'COntrol unit.
6.3 yolts I.e fllam'nt volta;., at I ampere, may be ob-
tained from ~Ins 1 a,ld 2, pin number4 on the socket sup-
plies ~y.lh DC, at a mcudmum current of 10 mtlli-
omperell anel pin 3is GOMected to ground. ~ stated
abov., cont~1 a' 117volh AC line power to the power

INTERCONNECTION PROCEDURE
*If the preamplifier requires 350VDC, use pin 4; If the
preamplifier requires less than 35UVDC. use pin 5and
connect adropping resistor of oppoprlalevolue and '101-
toge rating from pin 4 to pin 50f the octal sockets on the
HF 14 ehassiso For eHampl., if tha ~ .. lifi_ in queat-
Wired HF-65A preamplifiers wtll have thepreamplifier
leads connected to the octal plugas in the table above.
c) If It Is desired to use a p~if'" .. rwithout 0power
supplyotherthan the HF-61Aor HF-65A.;tfle power tab-
off leads of the preamplifier should be connected to the
HF-14 octal plug (after removing the iUllp8rs)- follows:
, the terminal with a number equal to h" of one of the
speake"', rated Impedance. (It maylJe necessary to "'phole II
the two speakers by revening bollao' the leads fromone
of the speakers.) This may not lie do .. if each of the
speakers Is designed for reproduction of a different part
of the audio spactum (woofer-tweeter' c:ambinations), In
which case a cross-over network krequired which con-
neets to the amplifier with only a. pair of leads.
Pin
of Octal Plug Connected to
6
7
I
2
4
3
Pin of 0cIa1 Plug. Com.dod to
6
7
1
2
40r 5"
3
Color of Preamp. Lead
grey
ll'ey
brown
brown
red
black
Preamp. Power lead
AeON-OFF
AC ON-OFF
filament (6.3VAC)
fHament (6.3VAC)
B+
ground
a) Make all system Interconnections bebe applying AC
power. Making or breaking interc:olVledions
while AC
power is
applied will result in a .:Imentary overload of
both the power amplifier and specliaersysilmwiihpossible
dornage to either or both.
b) If
the EICO HF-65A preampllflwcontrol unit (not self-
powered) has been obtained In kit form" remove 011 the
jumper connections In the octal plug .."plied with the
HF-14and wire the preamplifier pcJWer take-off leads to
this plug as follows:
d) CONVENIENCE OUTLETS, When the HF-14 Is used
with apreamplifier that takes power from it, weh as the
EICO HF-65A, the
convenience outlets of the HF-14will
be found useful.
Theoutletmarked"117VAC SH.II ("SW."
Is on abbreviation for "SWITCHED
It
)Is "lIve
lt
or "dead·
depending on whether the preampltfJer power switch Is
turned to
ON or OFF; plug tuners Into the outlet. The
outlet marked "117VAC" Is not switched and Is "live"
whenever the HF-14 line cord plug is Inserted In a wall
outJet; plug a record changer Into this outlet in order to
protect the mechanism. When
the HF-14 Is used with a
self-poweredpreamplifier,such as
the EICO HF-6SA, nor-
mally the convenienceovtlats on the preamplifier wfIJ be
used. However, the HF-14
outlets may be used also, if
desired, In which case both of them will be "switched".
INTERCONNECTION OF COMPONENTS.
SIGNAL
0) PREAMPLIFIER-CONTROL TO POWER AMPLIFIER,
Single conductor, shielded coble must be used to inter-
connect the preampllfter-eontrol unit or tuner-preampli-
fier-control unit and the power amplifier. Unless the
source has a low
impedmce outlet, such as a cathode
follower (with which up to SOft.
of cable can be used),
use the shortestpossible connection;In
any cose,use a low
capacity type of shielded cable (os10wOl2S mmf capacity
per foot is available). Both ends of the cable must be
fitted with
RCA type phono plug connectors.
amplifier,
andlndlrectly, power for the precimpllffer-con'"
trol unit, Ibelf, is made available through the connectiOns
to pins 6and 7. This arrangement Ii exactly suitable for
powerlngthe.ElCO HF-6.$4, and HF-61Apreampfifler-eOn-
trolunit;all that need be done Is to remove the octal plug
provided with the
HF-14 from the octal socket and Insert
the
octal plug-and-cobleaf the HF-65A In its stead. Note
that a Jumper between pins 2and 3of the octal plug fur-
nished with the HF-14effectively grounds one side of the
filament winding; removal of the
octal plug leaves the
filament winding
floating. This arrangement is used be-
cause 0hum balance control is connected acrou the fila-
ment leads In the EICO HF-65A preamplifier and the arm
of this control is returned to ground.
b)
SPEAKER CONNECTIONS: To connect your speaJcer
to the amplifier properly, you must know its rated Imped-
ance,whlch Is usuallymarked on the speaker or specified
In
the manufacturerls literature. Connect one speeker
lead to the terminal on
the rear apron marked "G"and the
olhe. speake. lead 10 the newby lanllinal desIgnated
b,
If It is desired to use two similar or Identical full-range
speakers of the some rated Impedance(eltherBor 160hms
only) for
better sound distribution, connect one speaker
lead of each paIr to "Gil and the two remaining leads to
ion requires 300VDC
B+voltage.10 .. draln,thedrop-
ping resistor will be required tothp .... voltage by SO
volts (350-300 = SO) at a current oflOrnlL Brehm1slaw,
the required resistance Inohms Isthe vollage drop in volts
divided by the current in amperes or50 wlts,l. 01 GIIIp. =
5000 ohms. The power dissipated in the resistor in watts
is equal to thevoltoge drop in volls rnuftipfied by the cur-
rent In amperes or SO volts x .OI~=O.5wotts. For
safety aresistor of double the woItage rating should be
used. Therefore, a 5000 ohm I watt resistor is required.
3

... In"n ... ce __ ~_ ...... _
CONTILOL ADJIISTMENTS
0) TheINPUTLEVELADJ. conlloll.ln.ended to protectthe
sPeaker system from"ubICllting" should lOIMOne tum the
preampllfler-eontrol unit level control. to full, bype .....
milling 1"" to attenuate.he preampllfl.r aulput .Ignal by
OoY"'lrod amount at .he Inpu' to.he power amplifier
where It can not be "fiddled" wlth~ Start by .. ttlng the
INPUT LEVEL maximum ccxnter--cloclcwl .. (maximum at..
tenuatlon~ using a screwdriver. Setthe LOUDNESS con-
trol on your preamplifier to the maxlmumclodk'Nl .. 1'011-
tion and the LEVEL control at the midpoint of Its range of
rotation. Tum your phonograph on CIld play on overage
orchestral record. Then slowlyortate the JNPUT LEVEL
ADJ. control clockwise until the--muslc II at normal (or
concert) IIttenlng level. This complet. theadJustment,
whlehneed not b. repeated.
b) ON-OFF SWITCH. Should be used In ON posltlan
when unit I. used with apreampllfter. It may be used ell
a pow.r on-off switch when the amplifier I, accessible.
TROIlBLE.SHOOTlNG PROCEDIIRES
YouraJnPlTfleuhouldrequire little Mrvlce exceptfor nor-
mal tube replacement. W. recommend no substitutIons
lar .he lube IypeI us.d In thl. ampllfl.r. The EL84, and
EZ81lypelaredl.tributed natlanallyby.heAmperex El.c-
IIonlc Carporallan (230 Duffy Ave., Hlcksvill., L.I.,
N. Y.)and MJllard Ltd. (lntematlonal ElectrOnlcsCorp.,
81 Spring 5••, N.Y. 12, N. Y.) If n ...... ry, repleee-
ments CCII be obtained directly from EICO.
To facilitate servicing, remedial andtrouble-shootlng pro-
cedures have been p<avldedIn the TROUBLE SHOOTING
CHART that falla,... AVOlTAGE AND RESISTANCE
CHART Is 01.0 provided as an aid In locating defective
components and to pennlta .corefu I~ stage~y-stage check
0' the amplifier. DCoperating voltagu are "Iv., both
at no Ilgnal and at a slpl developing 14wattsoutput as
~II as the cormpondlng 1kc signal voltages.
ToIsolate the sourceofunusual humor noise inyour system,
flnt turnofftheACpOwerandthen unplug the audio cable
connectingto the amplifier input. Then tum th.AC power
on again and note whether hum or nol.e has decreased.
If It has, the fault Is in the preamplifier or associated
equipment and measures should be teken to correct It os
described in the servlce notes fo'r these units. If it Is de-
.ired to provide a good building ground for your entire
system, run a lead from under speaker connection termInal
"Gil to a cold water pipe. Do not COM.ct such a ground
wire to other components in the s)'Item.
If the trouble Is no output or low output and the amplifier
is suspected, check AC signal voltagn stortlng at the In-
put and working step"'by""Step toward the output, using a
slne-wave audio signal generator and 0VTVM. Set the
Inpu •• Ignal to 1 vol.. The .arrespandlng grid and plate
slpoKll voitaguforthllinput are Indicatedon theschematlc
dl_. Thl. procedure .heuld .ufflce to locall .. the
defectl.,. Itage.
IF the trouble Is an'axcl!llllval)' distorted output, try tube
replacement, signal tracIng or precede directly to volt.
and resistance lnIIIQIUrements.
When the deFective It age Is loCQUzecl, procede to are-
sistance and voltage check of the stage, using thedataIn
the Resistance and Voltage chart. Disconnect the ampli-
fier From the power Itne and dlschargecopacltors prior to
making any .... I.tanc. check or N1movlng the EL84 output
tubes:. Do not tumthe ampllfl.r on wIth anyof the output
tubes removea.
CHECKING A TYPICAL TIJ8I STAGI
I. Check tUbe.
2. Check plate andcathade resl._.
3. Check- coupling capacttol'l for leakage or short.
4. For output stoge, check dc resistance of trGNformer
windings.
s. Check grid leak real.tor for open.
6. Check cathode by-pau capoclton For short.
7. IF no or low 8+ voltage on tube, check decoupllng
path for open or defective R14, and filter capacitor, C8
farthart.
8. IF wiring and circuit components Including the tube
check O. K. and B+ voltage is excessive, cheek the de-
coupling path for short or deFective R 14-
SERVICE
Iftrouble developes in your instrument whichyou can not
remedy )'OUrs.lf, write to our service de~nt listing
011 possible indications that might be helpful. If desired
you may return the Instrument to our factory where It will
be placed In operating conclltton for $5.00 plus the cod
of ports replaced due to their being damaged in the course
of construction. NOTE: Before retumlng this unit, be
sure on parts are securely mounted. Attach a tag to the
instrument, giving your home address and the trouble with
the unit. Pack very corefUlly in a "",pc;ontdlner, us-
ing sufficient packing material (cotton, shredded news-
paper, or excelsior), to make the unit cornpletelyimmov-
oble within the container. The original shipping carton
is satisfactory, providing the original inserts are used or
suFFicient packing moteriol inserted to keep the instru-
ment immovable. Ship by prepaid Railway Express, iF
possible, to Electronic Instrument Co., Inc., 33-00 North-
em 8Ivd., long Island City 1, New York. Retum ship-
mentwlll bemode byexpress collect. Note that acarrier
cannot be held liable Fordamages in transit iF packing
IN HIS OPINION, is InsufFicient.

VOLTAGE AND RESISTANCE CHART
"'"
"H'
DC VOlTS DCVOUS AC
VOLTS (1kc) "''''.-:I
NO SIGNAL l.4WAm
1.DVOLTS INPUT UNIT OFf
-,-
I
".
'112
,.
...,
V,
2••
I."
510KD
,
...
...
1.13
'.OKlI
.U
fJI-m (6. aVN: til pin 9)
,
232
".
•.s
,_
7112 105 "
...,
8105
1112
•••
""'''
•
f11_nt
....
1••
•••
......
... va
2•0
•••
-..
,
,~.
"
.,
'"''
.U
fll-' (6.3VAC b.twee)
•
7'"
".
,I
...... "
8••
'.S
......
•
,.,
'"
'"
•
..
118' ,'"
.."
V'
2
a
,.,
'"
,-
.U
f11_t (6.3VAC be'--)
•
7'"
.. "
8
•
All ~ CIIIcl_btane: __ ........ntdto d-II. Vo","- _--'
.... CI hIth InpIt 1....0- vrvM. All ... 1, __ F ... _ .....
w,1ta pill 3of !hi EZ81 graunOM -.pt, of -, wMn tM ~ to
__ .. pint 2 .. 8of the EZ81 II bel", checW, 0,-. .... 11 .. vol,.
....... ".1 ... "" Is 117yoltlN::,'CI .. HOl'EIALL
YQl.TAOI! & RESISTANCE VAWI!S MAYVAW NOIMALLYrv .1,..
SYMPTOM
House power line fuse blows;
fuse, F1, remains IntQct.
Fuse, Fl, blows.
Any or all tube ftlc:zments not lit.
DC voltage at V4 cathode (pin 3)
is incorrect os specified below.
a) No voltage
b) High voltage
c) Low '10 Itage
TROUBLE.SHOOTING CHART
CAUSE
Short in line cord, J2, J3 or associated
equipment plugged Into
J2 or J3.
If the amplifier causes a replacement fuse to
blow with rectifier tube VJ,removed, primary
or high voltage secondary windings of 12 are
Incorrectly wired or shorted.
If Fl
does not blow after replacement (with
V4 removed), check for short in 11+ circuih,
defective V4 and ca.
Open lead from 6.3 V winding of 12.
6. 3V winding of
12 open
Defectiye
VA
C8 shorted internally or externally.
Connection to C8 broken.
Connection to center tap of h. v, sec. winding
of T2 open.
Output tubes V2 and V3over-biased
or not drawing current.
Excessive current drain in amplifier.
Defective V4.
REMEDY
Ropcolr
Check and repair or replace.
Repair
Rapl ... T2.
Replace
Replace or repair.
Repair
Repair
See trouble-shootlng typieal
stage.
See trouble-shooting typical
stoge.
Replace

REPLACEMENT PARTS LIST
Stock'
~
Description
~
Stock'
~
Description Am't.
22S29 CI
cap., dIIC., lSOmmf, ='0%
I 97025
XN2. 3,4so<:ket, 9;;.1'" boHom mount 3
225"
C~5
cap., diIC., • 025m1d -500V (25Kor 2S,000) 2
4IX1OO
nut, hex 6-32 12
22539
C"
",,0' dllc., 2OOmmf, *10'*. 2
""""
nut, he", 3/8~32
I
23007 C.
cop., ,te"., 5Omfd-25V I
""""
nul, hex. 14--40
10
22533
c' c
•• , dl,c., 471l1'f1f, *10% I
40008
nut, hell, 18-32 a
2.011
C'
cap., .I&C., 3O-~20mfd-450V
I 40016
nut, for fvsehclder I
""""
C,
cap., paper, .03mfd-600V
I40017 nut, lin
.• '8-32
•
9100II
"fuse, 2....." I
6100II
lerew, '6-32:< I/~
12
SIlO" JI
10cJc, Iinlill. phono
I 61003
screw, 18-32 x3/8 •
SIIOI6 J~3
outlet, ODItVO'II.n~
241016
ICreW, 14-40 x 1/4
10
97032 J6 lack,. octal I
61028
screw, '8-32" 1•
18050 RI
pot., 500KQ, audio I
'2'"
_lMr, rubber for fu...holder I
10400 U.S-IO ..... , 10lCQ,.
l/2W, *10% (brown, block,. 0f0II$II', .lIver) 5
6200II
WQllM,. lock. '3/8 I
13,14 '2001 washer, flot,
'3/8
I
10631
R3
r •• , 470KD. 1/2W, *10% (yellow,viole', r-lIow,.lIver) I
'2002
wCIIIMr, lock. '6
10
11563
..
.... , 1.8KQ. 1/2N, '" 5'lEo
{bn;>wn. gilly, red. ""Id} I
62007
_her, Jock. '.0l-
IO
11527
",'
... , lOOKO" 1/2N, ,.5"-
(b~ bloclc,r-llow. ""lei) 2 62008 w
.. lwr, Jock, IS e
100412
,.,
.... , 330Kn,. 1/7N, .t:10%
(aronge, OI"QIlge, yellow, stiver) 262002 w
... her, f1al, '8
•
115:18
'"
.... ,221(0,
1/'lW, II: S'l' (
... d. red. ar<ngo, gald)
I'200II lug..
'6
I
16600
RI2
ros., 1650, 5W, *5% I
63006
lug, '8
I
II,.,. Rl5
rei., 680Q,
1/ZW,1I:10%
(blue, 1iI'9Y' brown, .llvor)
I .eooo
gn;lmmet, 3/8 I
62OIl4 "IWltch, .!ide, DPST I
66006
foot, rubber •
32005 TI h'anrfarmer,
outpul
I51006 plug, phona I
.,,,,
T2 tl'anlfannor, pawet I
51007
plug, actal
I
"'"
181
termInal board. 41cntW I
5700II
11M cord I
56<1111 T82 terminal
drip, 1 past right
I
""'"
wire, hoak.....p
lenglh
54003 TB3,4
t"""lnal drip, 2 past
2
"""
.pcrghettr I
.. gth
54003 '" terminal
IIrlp, 1 past rlghl w/ground
I
5"01 wi .... bam, '22
lortllth
""'"
VI tuba, 12AX7 I
81165
c......r. I
9003'
V~3
tube, ELS4/7189/68Q5
281166 bottam
pi,,'"
I
90038
V'
tube. EZ81
I 97300
tube .hrold
I
97800 '"
funholder
I66070 manu,,1 dInstructi"n (wired) I
'17027
'VI ""eket, 9 pr", tap mount I
66319
manu.,1 .,F in.tructl.,,, (kIt) I

VB
~ _~scrif.l~jon
CI cap., disc., lSOmmf,:l:lO%
C2'
cap., disc., .025mfd
C3 cap., disc., 2OOmrnf,:!:IO%
Rl1
C4 cap., disc., 2OOmmf,:l:10%
C5
cap., dlle., .02Smfd
V
Ltf-l
I
C6 cap., elee., SOrnfd-25V
R3'l: ::S.5 :::E R6
C7 cap., drlc., 47mmf,:l:10%
C7
V2 CB cap., .lec., 3O-200-20mfd-45OV
C9 cap., paper, .03mfd-600V
J1
I I -4
CI IFl fuse,2amp
C2
RIO
JI lack,
sl1l81e phono
J2 outlet, c:onvenlence
~' ~~3.1.
RB
J3 outlet, l:onvenience
R2 \,
R12
IZJ4 lack, octal
RI~ - I I ..
RI
pot.; SCIOKO, aud!o
...
R2 ros., lOKQ, 1/zw, .1~
R9
C6
R3
res., 470KO, I/ZN, :1:10%
R4 res., 1.8KQ, 1/2N,:I:,5%
R41
R7~C4::;:: (5
R13
OS res., 10KO, 1/211, :l:109b
.
R6 res., 100m 1(2W, :I:: 5%
R7
res., l00KO, 1/'lW, :I:: 5%
V3
T1
R8 res., 33OKO, 1/211, :1:10%
...
R9 res., 33OKO, I/ZW, :1:10%
RI. tel., 10Kg, 1/~, .10%
Rll res., ~KO,
l/tNi:l: ft
YZII t
~9
RI2 res., 1~.sQ, SW, • .\%
--l
It
Rl.4 t
V4
RI3
....., 10J(Q,
1/7rN, *1,",
RI4
res., 101m, 1/2N, :1:10%
-
RI5 res., 6EIOQ,
1/211, :1:10%
Fl 51
switch, slide
T1 tranUonnlr, output
CBC
CBB .LCBA -I=I
~
T2 transformer, power
:c
~
*J2
VI tub., tirAX7
l~ .~~
V2
lube, E1.B4/68Q5/l189
-V3 lube, ELB4/68Q5/lIB9
ZI"
___ ' __ it V4 tube, EZ81
.'5
LAi ••
MOQIL H"M
14 WATT HIGH FIDELITY POWER AMPUFIER

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The section of the manual be inning with this page is the CONSTRUCTION
section. All poges in this se tion heve page numbers followed by "C" nc,
2e, ete .}, The INSTRUCTI N section resumes on the pages following the
CONSTRUCTIONsection. N fe that the CONSTRUCTlONseetion is located
centrally in the book and ma be removed without desruptlng the INSTRUC-
TION leetlon that both
preces it and follows it.
Core taken In the conSfructlFf this Instrument will reward .the constructor
with many yecmofSCltisfactory. lee and greaterconfidence '0. his instrument.
We
urOe you to not rush the -nstruction, but to take all the time necessary
for proper assembly and wlrln .
Furthermore, we urge
stronglY~at youfollow the wire and parts layout shown
in the pictorial diagrams as cI Iy as possible. Veryoften wires are placed
as shown for a good reaton, nd certolnly the appearan.ce of the completed
Instrument wIll beimprov edan thedlfficultyof finding a wiring error will be
reduced by the following the ire and parts layout shown.
UNPACKING
THE KIT: un1
'k the kltcarefully and check each portogotnst
the
partslht Ineludingthese rts that are rnountedto the chanls. If youhave
trouble Identifying any ports rfer to the pictorial diagrams or the color code
,;; chart.
You will find that the value
1. a component will ... ary within the allowable
circuit tolerance. For exampl , the 4.7KO,
:t: 10% resistor may measure any-
where between 4.2KO and 5. KO. Tolerances on paper capacitors are sub-
stantially greater, and the to erence for electrolytics is usually +100% and
-50%. •
CONSTRUCTION HINTS, U E TME BEST GRADE OF ROSIN CORE SOLDER
ONLY, prefeTClbly one cont, tnlng the new activated fluxes such as Kester
"RI.ln-Ftve",
Ersln "Multlca II or simllcrrtyp ... UNDER NO CI~CUMSTAN
CES USE ACID CORE SOlDE OR ACID FLUX since acid flux can cause se-
rious corrosion. Before sold. tng make a certain of a good mechanical cen-
nectlon. U.e a clean, freshly Inned soldering Iron, no smaller than 100 watts,
and place the solder on the 1nt (not on the Iron)so that the lolder Is melted
bythe heat from the iolnt ttl If. Do not remo ... e the soldering Iron until the
solder fiowl and cheek to se. at th&resultlng joint Is smoe:th and.Mny when
the solder hal cooled. There are two extremes to be av
olded~ too little heat
<WId too much h.at. If too lit I. h.at IlllJpplled, th'lalnt willapp.arpitted
and grey, lndleoting a restn I int which isunsatllfoctory. On the other hand,
if too much
heat it applied aJoint, the parts connected to it may either
change v alu., loose their pra ctl.... coating, or break down. If you or. sol-
der1ngclos. to a port, hold th lead between the port and the Joint being
101 ...
dered with the tip of a pair of 10ngn05e pliers. The pliers will conduct the
heat away and prevent the componell,t from being unduly overheated. If for
any reason
it 11 necessary to reselder ajoint, be sure to use new solder.
It should also be noted that the lead'son resistors, capacitors, and transformers
are often longer than required. These leads should be trimmed to
the proper
length when necessary. Do not cut (my lead until you have detemilned the"
required length when the leOd 11 rout-ed c. shown In the diogrOOlS.
BASIC TOOLS REQUIRED: These basic tools are required for the construction,
of the amplifier.
1. Screwdriver - 3/16" to 1/4" blade
2. Screwdriver - 1/8" blade
3. longnese pliers - 5or 6"
4. Dlaeonal cutters
5. Soldering lron (100 watts), or soldergun, or penell Iron (35 watts)
6. Gas pliers
7. High quality rosin or equl
... alent synthetic flux core solder. D0!!2! use
ccld or paste flux under any circumstances.
A set
at spintites and a wire stripper are also ve~ useful supplemeri'tiiry tools:-
PARTS IDENTIFICATION: Please note that very many of the parts:'forwhich
color coding Is given maynot be celer coded, but have their ... aluesarid ratings
:,rinted. 'the letter J(' Is amultlpller(Xl000) and on reslston or capacltoti in-
dicates that the printed numerical vclue must be multiplied byone-thousand
to obtain the value in ohms or micro-micro farods respectl ... ely. Not.- a'lso that
one microfarad (mf)is equal to one "lillian; mlcro-microfaradl (mmf}r To -old
in rapid 1dentification, keep in mind that 5%, 10%, and 20% .... rifort,'a ...,
color coded whereas 1% resistor have their values printed; also thaf molded'
tubulat capacitors mayor may not be color coded, whereasdtlc capacitors and
electrolytlcs will alwQyJ hQVe their "Qlu .. printed. PloOlo note the following
relationships between the units used to
expres.s resistance or capac'ty.
1,000,000 ohm. (0) =1000 kilohm. (KO): 1 megohm (Ma)
1,000,000 micro-micro farad. (mmf) os 1 micro 'orack (rnf)
CONSDUCTlQN PRCX;EDUREj Thecomplete step-by-step mountingand wir-
Ing proctc:lure foilowi. Tokecp ""edrllW1ngsuncrowdtc:l, unnecenory repetition <
01 mounting or wirIng d.tail. may ~,. omltt.d. Nol" Th. abbrtVlallon'(I:"
means connect but do not soldeduntil other leedt ha.... been connllcfed),-'The-
abbrevlatlon (5) means connect and solder,
Bend the groundlug tabson the sockets toward' the chassisto prevenhJcc-ldeil---
tal shorting to the seeket pins.

•
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I- U
2.(
-.
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;;:

TOP OF CIHASSIS MOUNTING
1. ( ) Fig. 1. On the power t former 12, 30019, cut both red leads to 3",
the redoor-llow and whit. Ito 2 1/211 and the two green leads to 3 1/2".
Donot cut the remaining leads Mount the power transforme, all shown, with
the g,een leads clos .. t to the s de of the chossis (Fig.4&5). Use fou,'Siock-
wQlhen and four '8-32 hex n ts, Under one of the lockwashers, mount a 'S
ground lug as shawn in Fig. 4.
When the
JeexU on the transformptrs are too long, cut them to the size indicated
in the steps below. In each ~c+' after cutting the leads to the specIfied size,.
strip back 1/4" of the outer j~ulation so that the bare wire shows, Then tin
thewire bydipping the strippe{l end into asolder pot, or melting solder onto
the wire with ahotsoldering trbn.
~
2. () Fig. 1. On the output transFormer 11, 32005, cut the green lead to
3 1/2", the yellow lead to 1 1/2
11
and the blue lead to 4 1/2". Do not cut the
remaining leads. Mount the output transformer as shown with the brown end
the yellow leads closest to the rectaneiJlarhole in the stcleofthe chassis (Ag.4
&5). U.e fou, 'S lockwaohen and fou, 's-32 hex nuh.
3. ( ) Fig. 1. Mount the 9 pin mlnloture tube socket with shield support,
XVI, as shown. Note direction in Fin.4. Use two '<4-40 screws, two '41ock;;'
woshers and two ,~ he~ nvh.
4. () Fig. 1. Mount electrolytic eon copacTtor,C8, OJ shown. Note ~
moan, aquar. and trlangl. MClr lu. to d.termlne direction ofmountl"l (PlI.4).
Insert the mounting tabs into the slob in the chcasis andtwist the .some-
what Ie" than aquarter tum. DO NOT twist the tabs excessively or they wUJ
shear off. Solder the tab without ahole to the chaNls at Its slot.

- .....
N
co
...
..
,;,
;;:
l
4C

REAR CHASSIS MOUNTING
1. ( ) Fig. 2. Mount the foufcrew terminal board Tal, from the outside of
the chQlli. QI shown. Us. two 6-32lcrews and two '6-32 hex nut. Under
one hex nut, mount a '6 groun lug. Under the lecond hex nut, mount a one
post right terminal strip, r&2, nd a '6 lockwasher.
I
2. () Fig. 2. Mount the pcbtentiometer Tl, as shown. Us. one 3/81ock-
washer and one 3/8 hex nut. i
'(!: 3. ( ) Fig. 2. Mount the InLtlack JI, as .hown (Fig. 4). lke two '6-32
screws, two'6 lockwashen anr two '6--032 hexnuts.
4. ( ) Fig. 2. Mount the oC'41socket, J4, as shown. Note direction of key
In Fig. 4. Use two '6-32 scr~, two'6 lockwashers and two '6 hex nuts.
s. ( ) Fig. 2. t¥t.ount conve~lence outlets J2 md J3, as shown. Use two
'60032 screws, two '6 10ckwasWers and two '6-32 hex nuh on each.
6. ( ) Fig. 2. Push a 3/8" rLbber grommet through the remaining hole at
the rear of
the chClllls near co~v.nl.nc. outl.t J3.
7. () Fig. 2A. Cut two 2" lengtbi of block hook-up wire. Strip 3/4" of
insulatIon from both ends of
each. this will leave 1/2" of Insulation at the
exact center of each wire; Bend each wire into a "U" shape. One will be
used as a Jumper between pins 2 and 3 of the octal plug and the other Cll a
Jumper between pins 6end 7 of the oc:tol plug.
8. ( ) Fig. 2A. Pulh one end of one lead into pin 2 of the octal plug and
the other end of the same I.od into pin 3. When the lead ends have reached
the ends of
the pins, only the Insulatlcln will be vIsible at .h. rear of the plug.
9.
() Fig. 2A. Similarly connect 1)lugpins 6 and 7 with the other 211 lead.
10. ( ) Fig. 2A. Fonn 0puddleolsolder at the tlpol the soldering I"",. Hold
the plug with the pins down directly above the tip of the soldering iron. Dip
each of the pin-ends Into which wires have been inserted one at a time into
tl\e solder puddle and hold there for several' seconds until the solder rises up
into the pin by captllary action.
11. ( ) Fig. 2A. Press the cap down over the octal plug. It may be left off
jf there is inadequate room ot
the desired location for mounting the chassis.

N
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V)

FINAL CHASSIS ASSEMBLY
1. ( ) Fig. 3. On the side of t~e cheul. mount the sUcie switchS1, os shown.
(Fig. J,). Use two 1J,-.40 screWs, two IJ, lockwcahe" "'" two'4 hex nuls.
-I 2. ( ) Fig. 3. Moun. fuseholder XFl ca shown. Use large rubber wcaher
(1\ outside the chassis. ngh'en to "hOllis with hex nut supplied. Do not 'ighten
too much or holder will crac:k.
3. ( ) FIg. 3. Moun t the tubesockeh' XV2, XV3, and XVJ, ca........ (fig. J,).
Usetwo'4-40 screws, two '4Ioc!ewe.hen and two '4-40 hex nuts -an each.
4. ( ) Fig. 3. Mount the two post '·_Inal baard TB3, and the ...., post ......
mlnal board, 1M as shown. Use one '6-32lcrew, one '6Iockwasher.-d0Nl
'6-32 hex nuton each.

00
1"'
TBl
Rll
C7 TB2 XV3
R1
)1
)4
)2
-,
)3
51
-$-
•
T1 XV2 XVl TB4
TB3 R14 C8 XV4 C9 T2
"8.4
XFl

WIRING
1. ("""--Flg. 4. Connect a 1" piece of bene wire from Tll-! (C) to ground
lug itA U(S l).
2. (Io)""fi~. 4. From output trans~onner TI,COMect the black[ecd to D1-1 (S2),
tho brown lead 10 TSI-2 (51), t a yollow lead 10 181-4 (C) ond the brown-
yellow lead to XV3-7 (51). T lst the blue and red leads together. Connect
th ... d load 10 XV2-9(C)and Iablueleed toXV2-7(51). COMOct the groon
I .. d to T81-3(SI).
3. (~. 4. Cut both leads ~m a22KQ (red, red, orange, gold) S% resistor,
RI1, to 1/2". CoMe et from T~I-4 (C) 10 Tl2 (C).
4. (,rFle· 4. Cut both leads o~ a47 .... f disc capocllor, C7, to 3/4". Con-
nect from TB 1-4 (53) to 182 (C) ,
S. (~Flg. 4. Connect one eEOf a311 piece of yellow wire to XV2-4 (51)
-!I and one end of a 3" piece of b n wire to XV2-S (51). Twist the two leads
otogether and run along the eh Is as shown. Connect the other end of the
yellow wire to XV3-4 (C) and eother end of the brown wire to XV3-S (C).
6. (/( Fig. 4. Connect one e, of a 3" piece of yellow wire to XV3-4 (52)
and one end of a 3 1/211 piece f brown wire to XV3-5 (S2). Twist the two
leads together and run along th .chassis as shown. Connect the other endof.'
thebrawnwi .. to XVI-9(C)ond e other end oftheyellowwi .. IoXV1-S (C)..
7. (W1'1e.4. Connect 01/2" p~cool b",o wl,efromXVI-S(52)toXVI-4(C)~
8. (44. Connect one endia 5 1/2" piece of brown wire toXVI-9 (52)
and one end of a5" piece of lIow wire to XVl-4 (52). Twist the two I.ads
togeth.r and run along the eh is 01 .hown. Connect the other end of the.,
brown wi... to XV4-S (C) and tother end of the ~lIow wire to XV4-4 (C).
9. {~. 4. From the pow transformer T2, twl•• th. two green leads to..::
gether. Connect one leadto XV (t) and the iecondgreen lead to XV4-S (C).
10. {,t:, •. 4. Co"""t one "II 0' a" ple08 0' brownwire to XV ... , (S!).~
and an •• nd al • 2" pl •••• f II ... wi .. to XVo4-1 (53). Twi.1 the I.ads to-
IOthor and _oal to the end of the brown wi .. to J4~2 (~1) and Ih,
oth.r end 0' th. yellow wI,.. to -1 (S1).
11.
(~ig. 4. From the powenral\sformer 12, twist the two red leads to-
gether. Connect the shorter red leael toXV4-7 (51) and the longer-red lead,
to XV4-1 (51).
12.
(U'Flg.4. Connoc' al 1/2"plo eeofblockwl .. fromJ2-2(S1)1oJ3.,2lQ;
13. (;I'1;g.4. c:om.,c' 0 3/4" piece of bere wi .. from 51-I(C) 105)'·2(51)•.
14.
(~Ig. 4. Connect 0 3/4"plo .. ·ofbo .. wi .. from51"3 (C) 1051-4(51)•.
IS. (U'Flg.4. c:om.,clo 2" place of block wl .. lro0<51-3(52) toXFI"2'(51);"
16. (~FIg. 4. CoMecl 031/2"pieceof blookwl .. hoMJ2"l(C)Io.J.h6(51).
17. (H'!'lg. 4. c:om.,clo S" pI .. e of block wl'e fromJ3'-l.(Cl to J4-7 (51).
IS. Vfl'fu. 4. Connecto 4" pI .. eof blook wi .. from 51"1 (52) to .12+1.1(2);
19. (""FIg.4. From the pow", t ..... former T2, /wIst tho red-yellow andwhlto
I.ach together. Connect both leGds to ground lug "B
II
(C).
20. ~g. 4. From the POW" transformer12, connect one black·wacha:-
J3'-2 (C) ond the othe, blook lead to )(Fl-1 (C).
21.
(~Ig. 4. Cut both leadson0.03 mid (orange, block, o<ange,bh •• k,blue)
AIOldOd capocl~.C9. 10I". Connocl Irom XF1-1(52) toground lug. "8" (53).
22. (~. 4.. Connect a 2 1/2" piece ol .. dwl,ofromT84-) (C)Io.Cll..ll(C):
23. (..yflg. 4. CoMeclo l"ple ee ef b..-e wl .. from CB-~ (Cl to CIl-C (C).:·
24. (~. 4. Cut bolh loads on 0 10Kll (brown,black, _.lIvor)rooi.~,·
R14, to 1/2". ·Connect fromCB-A (C) 10CSoC (52).
25. ("1'Flg. 4.Connoct a 4" pleee 01; red wire from Cs-;t,(C).1o J<y44{C).
26. ~g • ..; Connect 0 3" pl .. e 01 redwi .. fro .. C8-:'($.3)·to ~V(l>).:
27. (1l1Ig.4. Conno.'. 21/2"pi •• ",1 red wi,. fro.. m"9(C)toXVM·(Sl}.
28. (~Fls.4. ConrMcta2 1/2"pl.ce,~, ... dwlre;romC8-A,'(S3)toXV2"9(s3J~

(6 I R10 XV2
R5 J4 R15
-
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TB2 (4 XVl
XV3
(5
Rl
(1
R13 R9
R2 R3
(2
J1 TB3
R8 R12
R6 (3 TI14
~
XV4
R7
Fig_ 5
J3
R4
•

1. (,;{FI9. 5. Connect a 3/4" piece of bare wire from J4-3 (51) to ground
lug "C" {St} on socket
J4.
2. ~. 5. Cut both lead! on a 6800 Iblue, grey, brown, silver) resistor,
RIStto 3/4". Cover each lead,with a1/2" piece of spaghetti. Connect from
XV4-3 (52)to J4-4 (51). '
3. (".+19g.5. Connect a 4 1/2' pieceof blackwire from TB2(S3)toXVl-3(C).
4. (6W'ig. 5. Connect a 3" pi ce of black wire fromXV3-3 (C) to XV2-3 (C).
5. (U"'FIS. 5. Cut both lea on a SOmfd electrolytic capacitor, C6, to
3/4". Cover both leads with CI /2" piece of spaghetti. COMect the negatIve
HI,nd to gn>Und lug "0" (5I) ot XV20nd the positive lend (+) toXV3-3(52).
6. (~F1g. 5. On the 165Qwir wound resistor, Rl2, cut one lead to 3/4
11
and
the second leod to I 1/2". Co er the shorter lead with a 1/2" piece spaghetti
and connect to XV2-3 ($2).
Meet the longer lead to ground Ius "Ell (51)
on can capacitor,
ca. Solder he Sl'Qund lug liE" to the chassis at this point.
=: 7. r,,;r FlliJ. 5. Cut both Ie • on Cl 100KQ(brown,ltlack, yellow, gold) S96
(" r.lstor, R7, to 3/4". Cover e ch lead with a 1/2" piece spaghetti. Connect
f",m XVI-B (C) to g",und lug' F" (C) ct XV3.
8. c,..r1lg. S. Cut both lea on a 200nvnf disc capacitor, C4, to 3/4".
Cover each lead with a 1/2" p ace of spaghetti. Connect from XVl-8 (C) to
gn>und lug"F" (52) ct XV3.
9. ( ~. 5. Cut both leads or a •025mfd (25K or 25, OOOmmf) disc capaci-
tor, CS, tc 3/4". Cover 'cch Ilecd with e 1/2" pile, of spCQh,ttl. Connect
frem XV1·8 (53)to XV3-8(C)
10. ("y1rg. S. Connect Q l' piece of bare wire covered with a 3/4" piece
of.poghetti frcm XVI-I (C) to XVI-7 (51).
11. (~Ig. 5. Cut both I I S on a 470KQ (yellow, violet, yellow,silver)
resistor, R3, to
1/2". Connec from XV1-I (C) to T83-1 (C).
12. {J(flg, S. Cut both I ds en clSOmmfdl.c ccpecltor, CI, to 3/4".
Caver one l.ad with a 1/2" p ece of spaghetti Q/"Id connect to XV1 ..1 (53).
Connect the other lead to T83 2 (e).
13. (""Fig. 5.· Cut both leads on (I 10KO: (brown, block,orange,sliver) re-
slster, RS, to 1/2". .Ccnneet rrom T83-.1 (53)to T83-2(52).
14. (~. 5. ctt both leads on a'1. 8KO: (brown,grey, red,gold) resistor,
R4, to 3/4". CoMect from XVI-3 (S~) to T84-2(C).
15. <tI1lg. S. Cut both leads on a 2)()mmf dIsc capacitor, C3, to JlI, Cover
one lead with a 3/4" piece of spagheUI and connect to XVl-6 (e). Connect
the other leod to T84-2(C).
16.
(,,"Fig. 5. Cut both leods on 0looKll (b",wn,block,yellow,gold)5%
r .. l.tor, R6, to 1/2". COMeet &om XVI-6 (C) to T84-1 (52).
17. (~5. Connect aI" pIeceof bare wire from potentiomete~ Rl-3(SI)
to JI-I (51). ;
18. CH'"'Flg. 5. Cut one lead on a 10Ke: (brown, black, orange,silver) re-
sistor, R2, to 1/2" and connect XV1·,2 (51). Cut the other lead to 3/4" and
connect to potentiometer
Rl-2 (51).
19.
(~. 5. Cut both lead. on c.I)2Smfd (25Kor25,OOOmmf) di.a capaci-
tor, C2, to 1 1/4". Cover each leae!with a 1" piece 0' spaghettI. Connect
f",m XVI-6 (53)to XV2-B (C).
20. (~g. 5. Cut all leads on two 10Ke:(bro:.m., black, orange,silver)
resistors,
RIO and R13, to 1/2". Connect RIO from XV3-8 (e) to XV3-2 ($1).
Ccneect RI3 frcm XV2-8 (C)to XV2··2 (5 I).
21. <,.JA!Ig. .5. Cut all leads on two 33OKO (orange, oronge, yellow, sliver)
re.i.toll, R8 end R9, to 1/2". Conn,ct R8 fromXV3-B (53)to ground lug "G"
(51) at XV3. Connect R9 from XV2~8 (53) to ground IUIi "H" (51) at XV2.
22. (/f'1'lg. 5. Push the tinned solder leod. frem the line cord thn>ugh the
grommet on the rear apron of the chcJS$js, next to J3. Tie a knot in the line
cord 1
1/2" from the tinned solder le'ads so that the cord eannot pull through
the grommet. Connect one solder lead
toJ3-2(53)and the second solder lead
to J3-1 (52).
23. Vf1g. 5. Conneeta 4 1/2"pleceofblackwlrefromJi-2(C)toTB4-2(S3).
24. (~lg. 5. Connect a 1 1/2" plet:. of black wlrefromJl-2 (52) to Rl..1(51).