Eico HF-87 User manual

STEREOPHONIC DUAL 35 WATT POWER AMPLIFIER
MODEL
HF-87

modei hf 87 STEREO DUAL POWER AMPLIFIER
general description
GENERAL
TheHF87 is adual power amplifier for stereo use with the
superb HF85 stereo preamp or any good self-powered stereo
preamp. Each power amplifier is conservatively rated at
35 watts. They employ our thoroughly proven cathode-
coupled phase inverter circuit, preceded by adirect cou-
pled voltage amplifier. The output stage employs ultra-
linear connected, self-biased, push pull EL-34's.
The two amplifiers maybe operated in parallel to deliver
70 watts for non-stereo use; either input can be made
common for both amplifiers by aservice selector switch.
Other convenience features include alevel control at each
input, ana-c power switch, two convenience outlets, and
afuse in an extractor post mounting.
The common power supply for the two amplifiers exhibits
very good regulation because of the self-bias operation and
the very low impedance characteristic of silicon diode
rectifiers. As aresult, signal conditions in one amplifier
have negligible effect on the operating conditions of the
other amplifier -aworthwhileobjective inahigh quality
design. To insure long life for the silicon diode recti-
fiers, electrolytics and tubes, aSurgistor is employed to
limit the starting surge currents.
SPECIFICATIONS
Output Power: 70 watts (two 35 watt amplifiers) contin-
uous, 140 watts peak
IM Distortion (60 &7000 cps at 4:1); 1% at 70 watts
Harmonic Distortion: Less than 1% from 20 to 20, 000 cps
within 1db of 70 watts
Frequency Response: ±0. 5db 5cps -lOOkc
Transient Response: Excellent square wave reproduction
(3 usee rise time); negligible ringing, rapid setting on
20kc square wave
Inverse Feedback: 17 db
Stability Margin: 17 db
Damping Factor: Above 11, 20 cps to 20kc
The intrinsic quality of the driving circuit, the output
tubes and the output transformers is so high that less feed-
back than usual is required to obtain extremely low dis-
tortion figures. As aresult, the amplifiers have high
margins of stability.
Other important design features, characteristic of all EICO
amplifiers, are arugged and generous chassis, maximum
separation of power tubes from each other and heat-sen-
sitive components, trouble-free-point-to point wiring,
and painstaking attention in reducing distortion without
compromising stability. Filter electrolytics and rectifiers
operate well below maximum ratings to insure long life.
The HF-87 has been designed to maintain its excellent
characteristics under speaker load (including electrostatic
types) as well as the resistive load normally used for test-
ing. Phase corrections have been provided at both ex-
tremes of the audio spectrum to insure stability under all
conceivable conditions and to insure that variations in
components and construction will not affect the perform-
ance. Stability is maintained on all speaker taps with
loads ranging from zero to infinity. Overload character-
istics are excellent. The HF-87 will not exhibit bounce
or flutter under pulsed conditions.
Sensitivity: 0. 38V for 70W output
Channel Separation: 55 db
Hum: Better than 90 db below rated output
Speaker connections: 4, 8, 16, and 32 ohms
Controls: Level Ch. 1, Level Ch. 2, "Service Selector"
switch, ON-OFF switch
Tubes: 1-ECC83/12AX7, 2-6SN7GTB, 4-EL34, 2-silicon
diode rectifiers protected by aSurgistor
Power Source: 117V, 60c
Power Consumption: 215 watts; 5amp. fuse
Size: HWD -6" x15" x11"
Shipping Weight: 32 lbs.
1
COPYRIGHT© 1959 ELECTRONIC INSTRUMENT COMPANY, Inc.

mechanical installation
GENERAL
a) HEAT DISSIPATION (VENTILATION): In common
with other electronic equipment, the Model HF-87 pro-
duces a great deal of heat in normal operation. Unless
continuous and adequate air flow is obtained around the
heat producing elements, these elements will overheat
and theiruseful life will begreatly curtailed. Adequate
ventilation will be provided if the amplifier is installed
in an open-back console provided that the top of the
amplifier is spaced at least two inches below any shelf
mounted above it. If the cabinet is enclosed at the rear,
provide several large holes or slots as low down and as
high up in the cabinet back as possible. As an alternate,
holes may be provided in the sides, bottom, or top of the
cabinet. The important thing to remember is that effec-
tive ventilation requires provision for cool airto enter at
the bottom and to leave at the top.
If the amplifier is not installed in aconsole, itshould be
situated preferably on an open surface. An attractively
finished matching cover for the MODEL HF-87 is avai Iable,
which will provide a“finished" appearance as well as
protection when the amplifier is not installed in aconsole.
Four rubber feet are also provided so that the amplifier
will not mar the surface of furniture on which it is placed.
b) ACCESSIBILITY TO PARTS: Tubes are the most fre-
quently replaced items in electronic equipment. If the
amplifier is placed in aconsole, sufficient space should
be allotted to reach and remove anytubeinthe amplifier.
Furthermore, input and output terminals of the amplifier
should be accessible to permit easy interchanging of sys-
tem components for comparison, if antennas are strung
around the back of the console in which the amplifier is
installed, arrange them so they will not interfere.
c) ELECTRICAL ISOLATION: To realize the full benefit
of having apower amplifier physically separate from the
preamplifier-control unit and/ortuner, the power ampli-
fier should be placed at least one foot away (more if pos-
sible) from either or both of these units.
d) ACOUSTICAL ISOLATION: If amplifier andspeaker
are installed in the same cabinet, provide sufficient sep-
aration to minimize mechanical speaker vibration reach-
ing the amplifier. The minimum separation is about one
foot.
CONSOLE MOUNTING
Having determined aproper location for the amplifier in
the particular console, the correct procedure for mounting
the amplifier chassis is as follows: a) If the rubber feet
have been inserted in the bottom plate, remove them
(pry out with athin screwdriver), b) Remove the 10
screws which fasten the bottom plate to the chassis, c)
Place the bottom plate (bumps facing up) at the location
on the shelf or the other mounting surface in which it is
desired to mount the amplifier. With a sharp pencil,
placed with its point directly against the edge of the lower
surface of the bottom plate, draw the outline of thebotr-
tom plate on the shelf and also mark the position of the
two extreme holes on both the long sides (front &rear),
d) Remove the bottom plate and drill eachof the marked
holes on the shelf to adiameter of 1/4". e) Refasten the
bottom plate to the chassis, with the six *8 x3/8 screws
previously removed, using the center holes on each of the
long sides and the two holes on each of the short sides,
f) Replace the chassis on the shelf, positioning itexactly
in the outline previously drawn, g) From the bottom side
of the shelf, inserta #8x Pscrew with a1/2" flat washer
against the head through each of the four front and rear
holes. These screws engage the stamped nut over each
hole on the chassis flange and when tightened secure the
chassis to the shelf.
electrical installation
POWER
a) POWER REQUIREMENTS: The EICOModel HF-87 re-
quires 215 watts at 110 to 120 volts, 60 cycles AC.
b) REMOTE SWITCHING: The EICO Model HF-87 is
provided with its own ON-OFF power switch. If the
HF-87 power amplifier is being used with apreamplifier,
such as the EICO HF-85, oraself-powered tuner-pre-
amplifier, the line cord of the HF-87 is inserted in a
switched 117VAC convenience outlet in the control unit.
Turn the powerswitchon the HF-87 to ON. Note: When
using aself-powered preamplifier-control unit, touchone
end of awire to the preamplifier chassis and the other
end to the power amplifier chassis. If aspark occurs,
pull out the HF-87 line cord plug and re-insert it with the
prongs reversed.
c) CONVENIENCE OUTLETS: When the HF-87 is used
with apreamplifier, such as the EICO HF-85, normally

the convenience outlets on the preamplifier will be used.
However, the HF-87outlets maybe used also, if desired,
in which case both of them will be "switched".
INTERCONNECTION OF COMPONENTS: SIGNAL
All input connections are to be made using single conduc-
tor shielded cable. Unless the source has alow imped-
ance output, such as acathode follower (with which up
to 50 ft. of cable can be used), use the shortest possible
connection. In any case, use alow capacity type of
shielded cable (as low as 25 mmf capacity per foot is
available). Both ends of the cable must be fitted with
RCA type phono plug connectors. For speaker connec-
tions, use plastic covered lamp cord or flat ribbon twin
lead.
(la, lb, lc below are possible input connections)
la) STEREO CONTROL PREAMPLIFIERTO HF-87 DUAL
POWER AMPLIFIER: Use two cables as described above.
Connect one cable from preamplifier output 1to input 1
on the HF-87. Connect another from preamplifier out-
put 2to input 2on the HF-87. Set the Service Sel switch
at the SEPARATE position. Power amplifier can deliver
35 watts per channel. DO NOT use dual conductor
shielded lead.
lb) MONAURAL CONTROL PREAMP TO HF-87 DUAL
POWER AMPLIFIER: Use one cable as described above.
Connect this cable from the preamplifier output to input
2on the HF-87. Put the Service Sel switch into the
COMBINED position. The power amplifiers can deliver
atotal of 70 watts to the speaker.
lc) USING YOUR OLD AMPLIFIER: You can use your
old power amplifier or integrated amplifierfor one stereo
channel, and the HF-87 connected for parallel operation
ofthedual amplifiers for the secondstereo chcnnel. This
may be worthwhile only if your old amplifier has arated
power output of at least 50 watts. Connect one cable
from stereo preamp output 1to input 2of the HF-87 and
set the Service Sel switch at the COMBINED position.
With the speaker connection terminals of the dual ampli-
fiers connected in parallel, the HF87can deliver 70 watts
to the speaker in stereo channel 1. Connect another cable
from stereo preamp output 2to input of your old power
amplifier or to the tuner or auxiliary input of your old
integrated amplifier. (In the latter case, set the tone
controls of the old amplifier to "flat" and loudness con-
tour orfi Iter controls to no effect). Thepower capability
of the second channel will then be the same as that of
your old amplifier.
(2^. 2b, 2c, &2d below are possible output connections)
2a) In the situation described in la above, for stereo
operation connect one speaker system between "G" and
the appropriate impedance tap on the speaker connection
terminal board for amplifier 1. Similarly, connect the
appropriate impedance tap on the speaker connection
board for amplifier 2. If you have only one speaker sys-
tem at this time, andwish to use the powerof both ampli-
fiers combined to drive it, then use the parallel operation
connection described in 2d below.
2b) In the situation described in lb above, if you have
two speaker systems connect one to each speaker connec-
tion terminal board (one for each amplifier) just as de-
scribedin2a above. Ifyou have only one speaker system,
use the parallel operation connection described in 2d be-
low.
2c) In the situation described in lc above, it is implied
that you have two speaker systems. Connect one speaker
system to your old amplifier and the second speaker sys-
tem to the HF-87 dual power amplifiers connected in
parallel as described in 2d below.
2d) Parallel operation of the HF-87 dual power amplifiers
is accomplished as follows: First determine the rated im-
pedance of the speaker system to be connected to the
paralleled amplifiers and multiply it by two. The result
will be 8, 16, or32ohms. Locate the connection termi-
nals on each of the two speaker connection terminal boards
on the HF-87 assigned to the tap of this value. Connect
an external jumper wire between this particular pair of
terminals (32 to 32 for a16Q speaker, 16 to 16 for an 8fl
speaker, or 8to 8for a4£i speaker). Finally, connect
the speaker between one of the "G" terminals and one of
the pair of terminals connected together by the jumper
wire.
CONTROL ADJUSTMENTS
a) The INPUT LEVEL ADJ. controls are intended to pro-
tect the speaker system from "blasting" should someone
turn the preamplifier-control unit level controls to full.
It permits you to attenuate the preamplifier output signal
by the desired amount at the input to the power amplifier
where it can not be "fiddled" with. Start by setting the
INPUT LEVEL control to the maximum counter-clockwise
(maximum attenuation) position using ascrewdriver. Set
the LEVEL control on one channel of the preamplifier at
the midpoint of its range of rotation. Turn your phono-
graph on and play cn average orchestral record. Then
slowly rotate the appropriate INPUT LEVEL ADJ. control
clockwise until the music is at normal (or concert) listen-
ing level. Repeat for the second chcnnel. This completes
the adjustment.
b) ON-OFF SWITCH: Should be set at the ON position
when the unit is used with apreamplifier. It may be used
as apower on-off switch when the amplifier is accessible.
3

maintenance
TROUBLE-SHOOTING PROCEDURES
Your amplifier should require little service except for
normal tube replacement. We recommend no substitutions
for the tube types used in this amplifier. The EL34 type
is distributed national ly by the Amperex Electronic Corp-
oration (230 Duffy Ave. ,Hicksville, L. I., N.Y. )and
Mullard Ltd. (International Electronics Corp. ,81 Spring
St., N.Y. 12, N.Y.) If necessary, replacements at any
time can be obtained directly from EICO.
To facilitate servicing, remedial and trouble-shooting
procedures have been provided in the TROUBLE-SHOOT-
ING CHART that follows. AVOLTAGE AND RESIST-
ANCE CHART is also provided as an aid in locating de-
fective components and to permit acareful, stage-by-
stage check of the amplifier. DC operating voltages are
given both at no signal and at asignal developing 35
watts output as well as the corresponding lkc signal volt-
ages.
To isolate the source of unusual hum or noise in your sys-
tem, first turnoff the AC power and then unplug the audio
cable connecting to the amplifier input. Then turn the AC
power on again and note whether hum or noise has de-
creased. If it has, the fault is in the preamplifier or
associated equipment and measures should be taken to
correct it as described in the service notes for these units.
If it is desired to provide agood building ground for your
entire system, run alead from under either speaker con-
nection terminal "G" to acold water pipe. Do notcon-
nectsucha ground wire to other components in the system.
If the trouble is no output or low output and the amplifier
is suspected, check AC signal voltages starting at the in-
put and work step-by-step toward the output, using a
sine-wave audio signal generator and aVTVM. Set the
inputsignal to.38volt. The corresponding grid and plate
signal voltages for this input are indicated on the voltage
chart. Repeat for the second channel. This procedure
should suffice to localize the defective stage.
If the trouble is an excessively distorted output, try tube
replacement, signal tracing, or proceed directlyto volt-
age and resistance measurements.
When the defective stage is localized, proceed to are-
sistance and voltage check of the stage, using the data
in the Voltage and Resistance chart. Disconnect the am-
plifierfromthe power line and discharge capacitors prior
to making any resistance check or removing the EL34out-
put tubes. Do not turn the amplifier on with any of the
output tubes removed. ~~ —— -—
CHECKING ATYPICAL TUBE STAGE
1. Check tube.
2. Check plate and cathode resistors.
3. Check coupling capacitors for leakage or short.
4. For output stage, check dc resistance of transformer
windings.
5. Check for open grid leak resistor.
6. Check cathode by-pass capacitors for short.
7. If no or lowB+ voltage on the tube, check decoupling
path for open or defectiveR31, R32or R35, filter capac-
itors C15, C16, C17 or C19, for short, or defective rec-
tifiers CR1 or CR2.
8. If wiring and circuit components including the tube
check O. K. and B+ voltage is excessive, check the de-
coupling path for short or defective R31, R32 or R35.
SERVICE
If trouble develops in your instrument which you can not
remedy yourself, write to our service department listing
all possible indicationsthatmightbehelpful. Note num-
ber appearing in red under the word “Manual" on the front
cover. If there is no number, state this. If desired, you
may return the instrument to our factory where it will be
placed in operating condition for $8. 00 plus the cost of
parts replaced due to their being damaged in the course
of construction. 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 arugged container, using
sufficient packing material (cotton, shredded newspaper,
or excelsior), to make the unit completely immovable
within the container. The original shipping carton is sat-
isfactory, providing the original inserts are usedor suffi-
cient packing material is inserted to keep the instrument
immovable. Shipby prepaid Rai Iway Express, if possible,
to Electronic Instrument Co. ,Inc., 33-00 Northern BIvd.
,
Long Is land City 1, N.Y. Return shipment will be made
by express collect. Note that acarrier cannot be held
liable for damages in transit if packing IN HIS OPINION,
is insufficient.
TRANSFORMER TEMPERATURE
The temperature of the trensformers used in theHF-87 run at less than 195°F despite the fact
that the safety limit is ata much higher 221°F. Although 195°F is cool for atransformer, it
is very hot to the touch. Transformers which seem too hot when touched with the hand, are
usually good aid are actually not overheating.
Output transformers usually run cooler than power transformers. Some output transformers
may appear hotter than others due to being located near hot components such as output and
power tubes and power transformers.
4

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