Eico HF-35 User manual

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TAMPLIFIER
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HF-35
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MODIl Hf -35
35 WATT
HIGH FIDELITY AMPLIFIER
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1

FEATURES
1. EF86 phenomenally low-noise, high gain, voltage
preamplifier*
2. Dtrec tcoup 1ing between vo Ito ge preamp] Ifler and phase
inverter to eliminate atime constant*
3* 6SN7GTB cathode-coupled ("long-tailed 11
)phase in-
verter for forced balance over the entire frequency and
dynamic range. Provides drive for the output stage from
equal and comparatively low impedances,
4* EL34/6CA7 output pentodes in apush-pull Ultra -Lin-
ear output stage,
5. Carefully balanced, extremely high quality wide-
band output transformer employing grain -oriented steel
and extensively interleaved windings, Asuperb high-
frequency roll -off characteristic permits achievement of
the virtually absolute stability sought for in the design.
The transformer is supplied fully potted and with 4,8,
and 16 ohm output taps.
6, Heavy duty power transformer with reserve capacity
for powering any preamplifier*
7, Extra-rugged GZ34 rectifier tube with indirectly heat-
ed cathode to el iminate high starting voltage on the elec-
trolytic filter capacitors and to delay the application of
the full B+voltage to the amplifier tubes until they have
warmed up,
8, Input level control,
9- Fuse and panel mount fuse holder*
10* Standard octal socket provided for preamplifier power
take-off and remote on-off switching,
11, Switched and unswitched AC convenience outlets*
12, Heavy gauge steel chassis.
SPECIFICATIONS
Rated Output Power :35 watts continuous; 70 watts peak.
1MDistortion (60 &6000 cps at 4:1): below 1, 5% at 35 watts; 0* 15% at 20 watts*
Total Harmonic Distortion :below 0. 5% at any frequency from 2Gcps to 20kc within 1db of 35 watts.
Undistorted Sinusodlal Frequency Response: ±0. 5db 5cps to 60kc at lwatt level; ±0* Idb 20cps to 30kc atony level
from 1milliwatt to 35 watts; no peaking or raggedness outside audio range.
Square Wave Response s20 cps to 20kc essential/ undistorted; 3,5 micro-seconds rise time; no overshoot at any frequency
or power level nor visible rounding below 15ke*
Inverse Feedback; 20 db
Stability Margin ;18db
Damping Factor: above 10, 20cpsto20kc; 15 at lkc.
Sensitivity ^0. 43 volt for 35 watts out*
Hum: 90 db below rated output.
Speaker Connections: 4, 8, and 16 ohms*
Tubes 2- EL34/6CA7, 1- EF86/Z729, 1- 65N7GTB, 1-GZ34.
Power Source: 110-120 volts, 60 cycles; 130 watts; 3amp fuse*
Size: HWD: 7" x14" x8'1
Weight; 25 lbs.
2

REPLACEMENT PARTS LIST
Stock* Sjrm. Description Am t
20042 Cl cap-, molded, Q5mfd -4QQV, ±10% l
21509 C2 cap dsc, IQDmmF, ±10% l
23007 C. op ,lec,, 50mfd-25V 1
20044 C4 cap-, molded, 23 mid -400 V±0% 1
20040 C5, 7cap ,mo d, lmfd-600V, ±10% 2
22335 C6 cap., disc., l/Sjnmf, ±10% 1
22542 C8 cap ,dsc. r750mmF -10QQ V410% 1
22532 C? cap., disc., 05mfd,±!0% (l.SKor 1500) 1
24007 C10f11 cap, ,elec ,2 x 20 mfd -500 V2
23011 C12 cap. ,elec., 50mfd-50V 1
20043 C13 cap., maided, 03mfd-60QV 1
91005 FI fuse, 3amp i
MX314 J1 jock, single phono 1
500 UJ2, 3oat let, convenience 2
97032 J4 jack, octal l
16016 R1 pot. 1MQ, audi 1
1040G R2 res ,10KC1, 1, 2W, ±10% *(brown, black, orange, silver
)
1
11531 R3 las., 470KC1 1/2W, ±5% (yellow, violet, yellow, gold) 1
11527 R4 res,, I00KQ, 1/2W, ±5% (brown, block, yel low, gold) 1
11505 *5 res, 100 Q, 1/2W, ±5% (brown, black, brawn, gold) 1
115 0K6 res., 1138Q, i/2W,±5% 1
10407 R7 res., IMQ, 1/2W, ±10% (br wn black, green silver) 1
10416 R8 res. I5KQ, 1/2W, ±10% (brown, green, ange, liver) 1
10*19 R9 ra §2GKil, 1/ 2W, ±10% (red, lolet yellow, liver) 1
10652 R10, 19 res ,15KQ, 1W ±10% (brown, green, orange, silver) 2
11513 R11, 12 res. ,3KQ, 1/2W, ±5% (orange, black, red, gold) 2
11600 R13 f*>., iBKQ, 1W, ±5% (b- own, grey, orange, gold) \
11601 ft 1
4
res. ,28. 75KQ, IW, ±5% 1
1602 R15 res., 33KQ, IW, ±5% (orange, orange, orange, gold) 1
10444 R16, 17 rt»s., 120KQ, 1/2W, ±10% (brawn, red, ye Ilow, silver) 2
14305 R13 res., 235a 1QW, ±10% 1
10432 R20 23 res. H1KQ, 1/2W, ±10% (brown, black, red, silver) 2
14306 *22 res. ,50a 10W, ±10% I
32004 11 tran-famer, output i
30020 T2 Irons fa riner, power i
54500 TB1 terml no! board, 4post l
54003 TB2, 5terminal strip 2post 2
54004 TB3 terminal strip 2post w/graund 1
54006 TB4 terminal strip, 3post, 2right 1
54001 TB6 terminal strip, 1pail right 1
90042 VI tube, EFB6 1
90041 V2 tube, 6SN7 1
Stock* Sjm. Description Am
900*0 V3,4 tube, EL34 2
90044 V5 tuDe, 5U4G& 1
97600 XF1 fuse holder 1
97027 XV 1socket, 9pm miniature 1
97032 XV2-5 socket, octal 4
40000 nut, *6 32 he* 21
40001 nut, */8~32 hex 1
40005 nut, *10-24 hex 10
40007 nut, *4-40 hex 2
40016 nut, *1/2-24 hex 1
40017 nut, *8-32 tinne man 10
41000 screw, *6-32 *1/4 Bd, H. 21
41003 screw, *8-32 x3/8 10
41006 screw. *10 24 x3/6 Bd. H. 10
41016 screw, *4-40 x1/4 2
41028 screw, *8-32 x14
42000 washer, *3/8 lock I
42001 washer, *3/9 Flat 1
42002 washer, *6 lack 20
42004 washer, *10 lock 10
42007 washer, *4 lock 2
42011 washer, *10 flot 10
42029 weeher. rubber 1/2 1Dl
42032 washer, *9 flot 4
43000 lug, *6 ground 1
430 2lug, *10 2
46000 gommet, 3/3 rubber 1
46006 bumper rubber 4
51006 input plug l
51007 octal plug and hood 1
57000 line card •l
50004 wire, hook-up length
58300 spaghetti length
58501 wire, bore *22 length
81097 bottom pla e1
ens7 chass t1
81903 coble clamp 1
97300 tube shield t
66069 manual of instruct an (wl. d) t
66310 manual of instruction (kit) 1
1Resistors wh eh gre Indicated on the part* Kst and/or in lha cnitrudion tm
being color- coded may sometimes not be co or -coded because of varying pocticu
between resistor manufacturer*, When this lithe case the value of the rt»‘sto, will
be found printed on the body, which will be of asolid color.

VOLTAGE AND RESISTANCE CHART
DC VOLTS DC VOLTS AC VOLTS (lkc) RESISTANCE
TUBE PIN* NO SIGNAL 35W OUT 35W OUT UNIT OFF
EF86/Z729 155 55 0.35 740Kn
200 0 0
31.2 1.2 0.35 1.2KO
4& 5filament (6, 3VAC between) -
648 48 5.3 500KO
700 0 0
B1.2 1.2 0.35 1.2KO
9000.4 IMegO
6SN7GTB 345 45 .0034 1.3Meg ft
2330 320 23 43KO
363 63 2.4 18KO
448 48 5.3 400KO
5320 320 23 42KO
663 63 2.4 18KO
7&8 filament (6,3V AC between)
EL34/6CA7 i33 36 0.1 2350
(both) 2&7 filament (6. 3VAC between) -
3450 440 265 2050
4450 440 110 1150
50023 120KO
6 0 023 I20KO
833 36 0.1 2350
GZ34 1-
2
ofilament 470 (5,0V AC to pin 8—remove tube to measure) above 200KO
o
4393 500
5--
6393 500
7-mm
8filament &cathode 470 465 above 200KO
All voltages and resistances are measured to chassis with the Input level control set maximum. clock-
wise (full gam). Voltages are measured with ahigh impedance VTVM. All resistance measurements
are made with pin 8of the GZ34 grounded except, of course, when the resistance to ground at pins
2and 8of the GZ34 Is being checked. Operating line voltage at which voltage measurements are
made is 117 volts AC, 60 eps. NOTE? ALL VOLTAGE &RESISTANCE VALUES MAY VARY NOR-
MALLY BY ±15%*
8

TROUBLE-SHOOTING CHART
SYMPTOM CAUSE REMEDY
House power line Fuse blows; Short in line cord, J2, J3 or associated Repair
fuse, FI, remains intact. equipment plugged into J2 or J3.
'
.
Fuse, FI, blows* If the amplifier causes areplacement fuse to Check and repair or replace*
blow with rectifier tube V5 removed, primary
or high voltage secondary windings of T2 are
Incorrectly wired or shorted*
If the amplifier does not cause FI to blow Check and repair or replace*
when V5 is out of the socket, but does
cause FI to blow when V5 is placed back
In the socket, then check for short In B+
circuits, or defective V5, CIO, CII *
V5 filament not lit. Incorrect wiring of ft!, leads to V5 socket*
5V HI. winding of T2 open.
Repair
Replace 12.
Any or all other tube filaments
not Ilf.
Open lead from 6* 3Vwinding of T2,
6. 3Vwinding of T2 open*
Repair
Replace T2.
DC voltage at V5 cathode {pin 8)
Is incorrect as specified below*
a) No voltage* Defective V5,
CIO shorted internally or externally*
Replace
Replace
Connection to center-tap of high-
voltage winding of T2 is open*
Open R22.
Repair
Replace
b) Low voltage. C11 shorted Internally or externa My* Replace or repair
i'
Connection to C10 from pin 8of V5
is broken, or open CIO.
Repair or replace
Excessive current drain In amplifier. Repair
c) High voltage. Output tubes V3 &V4 over- biased
and not drawing current*
V3 or V4 defective.
Repair
Replace
Open R9 or RIO,
Shorted R22,
Replace
Repair or Replace
7

FINAL STEPS
You have now completed the assembly and wiring of your amplifier. When
you have completed the following steps your amplifier wi 1 1 be ready for use.
1} To catch any wiring errors. It is suggested that the entire wiring be checked
polnt-by-polnt against the wiring instructions (and preferably also against the
schematic wiring diagram In order to become more familiar with the component
layout and circuitry). While doing so, check for rosin Joints, loose lumps of
solder, poor lead dress, and accidental shorts or leakage paths arising From the
flow of rosin between contacts (remove with astiff brush dipped In carbon
tetrachloride)*
2) Clean socket XVI with carbon tetrachloride using astiff brush. It is also
advisable to remove the tube and shield from XVI, and clean the socket and
pins on top of the chassis.
3) Insert tubes VT through V5 in their correct sockets and the fuse in the fuse
holder* Place ashield over VI
.
4) Insert the octal plug into octal socket J4,
5) IMPORTANT: BE SURE TO MAKE THE FOLLOWING RESISTANCE CHECKS
BEFORE CONNECTING TO THE AC LINE: Check for acolddc resistance of
at least 1.2 ohms across the AC pul gf check for aresistance of at least 45 ohms
between ground and pins 4and 6of XV5; check for aresistance of at least
200Kohms between pin 8 of the rectifier tube V5 and ground. Allow suffi-
cient time for the electrolytic capacitors to be charged by the ohmmeter bat-
tery In this last measurement. These measurements const itute areasonable check
of the powersupply components and wiring before applying power. If you fall
to obtain these resistance values/ do not proceed to the next step until the
cause Is discovered and the condition remedied. If the measurements are sat-
isfactory, proceed to CONTROL ADJUSTMENTS in the MAINTENANCE sec-
tion of the book* DO NOT CONNECT TO THE AC LINE until you have com-
pleted the preliminary BIAS ADJ* and BALANCE ADJ. control adjustments,
at which point you will be Instructed to do so. When you have completed the
CONTROL ADJUSTMENTS, proceed to the step following this one, after
having disconnected the amplifier from the AC line.
6) Press aspeed nut In place over each hole on the bottom flange of the chassis
(see Fig. 6),
7) If the amplifier is not going to be fastened to some surface ,insert the rubber
feet in the openings provided In the bottom plate and mount the bottom plate
on the chassis, using 10 ^8^32 X3/8" screws. Do not use the 1" long screws
for this purpose (possibility of shorting input jack). If the amplifier is to be
fastened to asurface, the Feet will not be used and the bottom plate will be
required as atemplate before it is attached to the amplifier.
8) Read theMECHANICAL IN5TALLATION and ELECTRICAL INSTALLATION
sections of the instruction book coreful ly, and Install and connect the amplifier
IF you are still having difficulty, write to our service department listing all
possible Indications that might be helpful. If desired, you may return the in-
strument to our factory where if w! 1 1 be placed in operating condition for $5.00
plus the cost of parts replaced due to their being damaged in the course of
construction. This service policy applies only to completed instruments con-
structed in accordance with the instructions as stated in the manual. Instru-
ments that are not completed or instruments that are modified will not be ac-
cepted for repair. Instruments that show evidence of acid core solder or paste
fluxes will be returned not repaired. NOTE: Before returning this unit, be
sure all parts are securely mounted. Attach atag to the instrument, giving
your home address and the trouble with the unit. Pack very carefully in a
rugged container, using sufficient packing material (cotton, shredded news-
paper, or excelsior), to make the unit completely immovable within the con-
tainer. The original shipping carton is satisfactory, providing the original
inserts are used or sufficient packing material Is Inserted to keep the instru-
ment immovable. Ship by prepaid Railway Express, if possible, to the Elec-
tronic Instrument Co. ,Inc., 33^00 Northern Blvd. L.l. C. 1, New York. Re-
turn shipment will be made by express collect. Note that the carrier cannot be
held liable for damages In transit If packing, [N HIS OPINION, Is insufficient.

nc
1. ()Fig. 5. Connect the white and the red-yellow leads from hole "W"
to ground lug "E" (C).
2. ( ) Fig. 5, Connect the black lead From hole "X" to J3-2 (C).
3. ( ) Fig. 5, IF your line voltage Is normally below 122 volts, connect
the red-black lead to XF1-I (C), and tape up the green-black lead as shown.
IF your tine voltage is normally above 122 volts, connect the green -black lead
to XFl-1 (C) and tape up the red-black lead as shown.
4. (}Fig. 5. Cut both leads on a,Q3mfd (orange, black, orange, black, blue)
capacitor, C13, to 1". Connect from XF1-1 (52) to ground [gg 11 E" (53).
5. ()Fig. 5. Cut both leads on a750 mmfcapacitor, CB to 3/4". Connect
one lead to TB5-2 (C) and the other to XV3-3 (52).
6. ()Fig. 5. Connect a511 piece of yel low wire from XV4-8 (C) to XV3-1 (C),
7. ()Fig, 5. Connect a51/2" piece of green wire from TB5-1 (S2) to
XV4-6 (C).
8* ()Fig. 5. Connect a41/2" piece of red wire from TB5-2 (S3) to J4-8 (C).
9. ()Fig, 5, Twist the two green leads from hole "X" on the power trans-
former T2, as shown. Connect one lead to XV4-7 (C) and the other lead to
XV4-2 (C).
10. ()Fig.5. Connecta 11/4" piece of bare wire from XV4-2 (S3) to J4- 1(5 1).
11. { ) Fig. 5. Connect a3" piece of brown wire from XV4-7 (S3) to J4-2 (5 1).
12. {)Fig. 5. Connect a3/4" piece of bare wire from J4-3 (SI) to ground
lug nB" (SI) on J4.
13. ( ) Fig, 5. Cut both leads on a15KQ (brown, green, orange, silver) 1watt
resistor, R19, to 1/2". Connect from J4-8 (S2) to J4-4 (SI).
14. ()Fig. 5, Connect a11/2" piece of bare wire covered with a1" piece
of spaghetti from J4-6 (SI) to J3-1 (C).
15. ( ) Fig. 5. Connect a31/2" piece of yellow wire from J4-7 (SI) to
J2-1 (C),
16. ()Fig, 5. Connect a41/2" piece of brawn wire from J3-1 ($2) to
XF1-2 (SI),
17. ()Fig. 5, Connect a11/4" pieceof bare wire from J2-2 (C) to J3-2 (S2).
18. ( ) Fig. 5. Connect a1/2" pieceof bare wire from XV4-8 (C) to XV4-1 (51),
19. ()Fig, 5. Connecta 1/2" piece of bare wire from XV3-8 (SI) to XV3- 1(C).
20. ( ) Fig. 5. Cut one lead on the 235Q resistor, R18, to 11/2" and the
other lead to 3/4". Cover the longer lead with a11/4" piece of spaghetti
and connect to XV4-8 (S3), Connect the other lead to ground lug "D" (C).
Dress this resistor flat against the chassis* Dress all leads away from this resistor,
21* ( ) Fig, 5, Cut both leads on a50 mfdf50 volt, electrolytic capacitor
C12 to 11/4", Connect the positive (+) lead to XV3-1 (S3) and the negative
lead to ground lug "D" (S2 )*
22, ()Fig, 5. Cut all leads on two 1KQ (brown, black, red, silver) resistors,
R20andR21, to 1/2", Connect one resistor, R20 from XV3-6 (C) to XV3-5 (SI)
and the other resistor, R21 from XV4-6 (C) to XV4-5 (SI).
23, {)Fig. 5. Cut all leads on two 120KQ (brown, red, yel low, silver) resis-
tor, R16 and R17, to 3/4", Connect one res istor, R16, from XV3-6 (S3), to
ground lug "F1atXV3{52). Connect the second resistor, R17, from XV4-6 (S3)
to ground lug "G"at XV4(51), In both cases, be careful not to burn the wires
passing near the ground lugs,
»
24, {)Fig. 5. Pass the tinned leads from the line cord through the grommet
at the rear of the chassis. Make aknot 3/4" from the end of the solder lead, so
that the line cord cannot be pulled through the grommet. Connect one tinned
lead to J2-1 (52) and the other tinned lead to J2-2 (S2),

1. {}Fig. 4. From hole "Y" of output transformer Tl, twist the red and
red-yellow leads together. Connect both leads to TB4-1 (C).
2. ( ) Fig. 4, From hole "Y fl of the output transformer Tl, twist the brown
and brown -yellow leads together. Connect the brown lead to XV3-3 (C) and
the brown-yellow lead to XV3-4 (SI),
3. {)Fig, 4. From hole trYMof the output transformer Tl, twist the blue
and blue -ye Ilow leads together. Connect the blue lead to XV4-3(Sl)and the
blue -ye How lead to XV4-4 (SI).
4. ( ) Fig. 4, Connect a41/2" piece of green wire from TB4-2 (C) to
XV2-4 (C).
5. ( ) Fig. 4. Cut both leads on alOOromf disc capacitor, C2, to 1/2",
Connect from TB4-2 (C) to TB4-3 (C)
6. ()Fig, 4, Cut both leads on a1G0KO (brown, black, yellow, gold) resistor,
R4, to 3/4". Connect from CI1-B (C) to TB4-2 (S4).
7. ()Fig. 4* Cut both leads on a15Kf3 (brown, green, orange, silver) 1/2N
resistor, R8, to 3/4 11
.Connect from Cl 1-B (C) to TB4-3 (S2).
8. ( ) Fig. 4. Cut both leads on a270KQ (red, violet, yellow, silver) resistor,
R9, to 1/2", Connect from C1 1 -A (C) to C11*8 (S4).
9. ()Fig, 4, Connect a5Mpiece of red wire from C10-A (C) to T85*2 (C).
10- ( ) Fig. 4. Connect a6" piece of red wire from C10-A (C) to TB4-I (C),
11, ( ) Fig, 4, Connect a5" piece of red wire from Cl l-A (C) to TB6 (C),
12, ( ) Fig, 4. Cut both leads on a15KQ (brown, green, orange, silver) 1watt
resistor, RIO, to t/2". Connect from TB4-1 (S4) to Cll-A (C),
13, ()Fig. 4* Cur both leads an a28. 75KQ (red, grey, grey, gold) resistor,
HI 4, to 3/4"; Connect from XV2-5 (C) to C11-A (S4)+
14. ()Fig. 4. Connect aI1/4 11 piece of bare wire covered with a1" piece
of spaghetti from XV2-6 (SI) to XV2-3 (C).
15. (!Fig. 4. Cut both leads on aIMft {brown, black, green, silver) resistor,
R7, to 1/2". Connect from XV2-1 (C) to XV2-4 (S2).
16. ()Fig. 4. Cut both leads on an 18KQ (brown, grey, orange, gold) resistor,
R13, to 3/4"* Connect from XV2-3 (S2) to ground lug "F" (C) on XV3,
17. ()Fig. 4. Cut both leads on a 33Kfi (orange, orange, orange, gold)
resistor, R15, to 3/4". Connect from TB6 (S 2) to XV2-2 (C).
18. ()Fig. 4. Cut both leads on a,25mfd (red, green, yellow, white, yellow)
capacitor, C4, to 1". Cover one lead with a3/4" piece of spaghetti and con*
neat to XV2*1 (S2), Connect the other lead to ground tug "C (SI) at CIO-
19. ( ) Fig. 4, Cut both leads on a-1mfd (brown, block, yellow, white, blue)
capacitor, C5, to I". Connect from XV2-5 (S2) to XV3-6 (C).
20. ()Fig. 4. Cut both leads on a,1mfd (brown, black, yellow, white, blue)
capacitor, C7, to 11/2". Cover each lead with aI1/4" piece of spaghetti.
Connect from XV2-2 (52) to TB5-1 (C).
21- ( ) Fig. 4, Twist the two red leads from hole Tof power trcnsformer
T2, and run along the chassis as shown- Connect one red lead to XV5-4 (SI)
and the other red lead to XV5-6 (SI),
22. ()Fig. 4, Twist the two yellow leads, one from hole "W" and the other
from hole "X", of the power transformer T2, and run along the chassis as shown.
Connect one yellow lead to XV5*2(S 1) and the other yellow lead to XV5-8 (C),
23. ()Fig. 4, Cut both leads on a5GQ, lGwatt,wire wound resistor, R22,
to 3/4". Cover each lead with a1/2" piece of spaghetti. Connect from XV5*8
(52) to C10-B (C).
24. ()Fig. 4. Connect a11/4" piece of bare wire from CIO-B (S2) to
C10-A (S3),