Eico HF-89 User manual

MODEL HF 89 STEREO DUAL POWER AMPLIFIER
general description
GENERAL
The very finest techniques known to the audio art are
applied in the HF-89 stereo high fidelity dual power am-
plifierto insure the utmost in audio quality under the most
demanding circumstances. The HF-89can be used with the
superb EICO HF85stereophonic preamplifier or with any
good self-powered stereo preamp.
Each power amplifier of the HF-89 is conservatively rated
at 50 watts and employs the thoroughly proven cathode-
coupled phase inverter-driven circuit, preceded by a
direct-coupled voltage amplifier. Ultra linear connected,
fixed-biased, push-pull EL34's are used in the output
stage and provision is madefor both bias and dc balance
adjustments. The very low impedance characteristic of
silicon diode rectifiers gives the common power supply
for the two amplifiers very good regulation. As aresult,
signal conditions in one amplifier have negligible effect
on the operating conditions of the other amplifier —a
very worthwhile feature in ahigh quality design. To
insure long life for the silicon diode rectifiers, electro-
lytics, and tubes, asurgistor is included to limit the start-
ing surge currents.
SPECIFICATIONS
Output Power; 100watts (two 50watt amplifiers) contin-
uous, 200 watts peak
IM Distortion (60 &7000 CPS at 4; 1); 0. 5% at 100 watts
Harmonic Distortion: Less than 0. 25% from 30 to 15, 000
cps and less than 1% from 20 to 20, 000 cps within Idbof
100 watts
Frequency Response: ±0. 5db 5cps -lOOkc
Rise Time: 2. 5usec
Square-Wave Response: Essentially undistorted to 20, 000
cps
Inverse Feedback: 18db
Stability Margin: 13 db
Damping Factor: above 12, 20 cps to 20kc
The intrinsic quality of the driving circuit, the output
tubes, and the output transformers in the HF-89 is unsur-
passed. IM distortion at normal listening levels drops to
below 0. 1%, and even at 100, 000 cps atotal of 60 watts
undistorted output is available to insure unimpaired tran-
sient (square wave) response even at very high power
levels. The low end is extremely solid and full, as an
undistorted total power output of 78 watts at 15 cps and
28 watts at 10 cps would imply. Furthermore, the high
circuit and component quality results in less feedback
required to achieve these very low distortion figures, so
that the HF-89 amplifiers have avery healthy stability
margin to insure perfect results in any application.
The methods of stereo recording are such that, at moments,
practically all the sound is in one channel or the other.
For this reason, the best stereo installations require an
amplifier in each channel as powerful as that used in the
best monophonic installations. 50 watt amplifiers have
been found very worthwhile in the best monophonic instal-
lations and actual 50watt amplifier will be found equally
worthwhile in the best stereo installations.
Channel Separation: 60db
Sensitivity: 0. 55V for full output
Hum: Better than 90db below full output
Controls: Level Ch. 1, Level Ch. 2, "Service Selector"
switch, ON-OFF switch
Speaker Connections: 4, 8, and 16 ohms
Tubes: 1-ECC83/12AX7, 2-6SN7GTB, 4-EL34, 2silicon
diode rectifiers (power), 1selenium rectifier (bias); sur-
gistor protected for long life
Pbwer Source: 1 1 7V, 60 cps
Power Consumption: 215watts at no signal, 270 watts at
100 watts out
Size; 15“ x11" x6"
Shipping Weight: 37 1/2 lbs.
1
COPYRIGHT© 1960 ELECTRONIC INSTRUMENT COMPANY, Inc.

mechanical installation
GENERAL
a) HEAT DISSIPATION (VENTILATION): In common
with other electronic equipment, the Model HF-89 pro-
duces agreat deal of heat in normal operation. Unless
continuous and adequate air flow is obtained around the
heat producing elements, these elements will overheat and
their useful life will be greatly 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 coolairto enter at
the bottom and to leave at the top.
If the amplifier is not installed in aconsole, it should be
situated preferably on an open surface. An attractively
finished matching cover for the Model HF-89is available,
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 marthe surface of fumitureon 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 any tube in the 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/or tuner, the power ampli-
fier should be placed at leastone foot away (more if pos-
sible) from either or both of these units.
d) ACOUSTICAL ISOLATION: If amplifier and speaker
are installed in the same cabinet, provide sufficient sep-
aration to minimize mechanical speaker vibration reaching
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 asharp pencil,
placed withits point directly against the edge of the lower
surface of the bottom plate, draw the outline of the bottom
plate on the shelf and also mark the position of the two
extreme holes on both the long sides (front &rear), d) Re-
move the bottom plate and drill each of the marked holes
onthe shelf to adiameterof 1/4". e) Refasten the bottom
plate to the chassis, withthesix #8x 3/8 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 it exactly in the
outline previously drawn, g) From the bottom side of
the shelf, insert a#8 x1“ screw with a l/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-89 re-
quires 21 5watts at no signal, 270watts at 100 watts out.
b) REMOTE SWITCHING: The EICO Model HF-89 is
provided with its own ON-OFF power switch. If the
HF-89 power amplifier is being used with apreamplifier,
such as the EICO HF-85, or aself-powered tuner-pre-
amplifier, the line cord of the HF-89 is inserted in a
switched 117VAC convenience outlet in the control unit.
Turn the power switch on the HF-89 to ON. Note: When
using aself-powered preamplifier-control unit, touch one
end of awire to the preamplifier chassis and theother end
to the power amplifier chassis. If aspark occurs, pull out
the HF-89 line cord plug and re-insert it with the prongs
reversed.
c) CONVENIENCE OUTLETS: When the HF-89 is used
with apreamplifier, such as the EICO HF-85, normally
the convenience outlets on the preamplifier will be used.
2

However, theHF-89 outlets may be 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 impedance
output, such as acathode follower (withwhich up to 50 ft.
of cable can be used), use the shortest possible connec-
tion. In any case, use alow capacity type of shielded
cable (as low as 25mmf capacity per foot is available).
Both ends of the cable must be fitted with RCAtype phono
plug connectors. For speaker connections, use plastic
covered lamp cord or flat ribbon twin lead.
(la, lb, lc below are possible input connections)
la) STEREO CONTROL PREAMPLIFIER TO HF-89 DUAL
POWER AMPLIFIER: Use two cables as described above.
Connect one cable from preamplifier output 1to input 1
on the HF-89. Connect another from preamplifier output
2to input 2on the HF-89. Set the Service Sel switch
at the SEPARATE position. Power amplifier can deliver
50watts per channel. DO NOTuse dual conductorshield-
ed lead.
lb) MONAURAL CONTROL PREAMP TO HF-89 DUAL
POWER AMPLIFIER: Use one cable as described above.
Connect this cable from the preamplifier output to input
2on the HF-89. Put the Service Sel switch into the
COMBINED position. The power amplifiers can deliver
atotal of 100 watts to the speaker.
lc) USING YOUR OLD AMPLIFIER: You can use your
old power amplifier or integrated amplifier for one stereo
channel, and the HF-89 connected for parallel operation
of the dual amplifiers for the secondstereo channel. This
may be worthwhile only if your old amplifier has a rated
power output of at least 50 watts. Connect one cable
from stereo preamp output 1to input 2of the HF-89 and
set the Service Sel switch at the COMBINED position.
With the speaker connection terminals of the dual ampli-
fiers connected in parallel, the HF-89 can deliver 100
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 contour
or filter controls to no effect). The power capability of
the second channel will then be the same as that of your
old amplifier.
(2a, 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 system at
this time, and wish to use the power of both amplifiers
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-
scribedin 2a above. If you have only one speaker system,
use the parallel operation connection described in 2d
below.
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 system
to theHF-89 dual power amplifiers connected in parallel
as described in 2d below.
2d) Parallel operation of theHF-89 dual power amplifiers
with full 100 watts output is possible for speaker upto 8
ohms impedance: First determine the rated impedance of
the speaker system to be connected to the paralleled am-
plifiers and multiply it by two. Locate the connection
terminals on each of the two speaker connection terminal
boards on the HF-89 assigned to the tap of this value.
Connect an external jumper wire between this particular
pair of terminals (16 to 16 for an 8Clspeaker, or8to 3for
a40speaker). 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) TheINPUT 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 an average orchestral record. Then
slowly rotate the appropriate INPUT LEVEL ADJ. control
clockwise until the music isatnormal (or concert) listen-
ing level. Repeat for the second channel. 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
BIAS &BALANCE ADJUSTMENTS
In the HF89, fixed bias Is employed In the output stages.
Each of the two amplifiers is provided with aBIAS ADJ.
potentiometer and aBALANCE ADJ. potentiometer. It
is essential that these controls be adjusted exactly as in-
structed before putting acompleted kit amplifier into use,
or at any time thereafter when any of the output tubes
are replaced or itis suspected thatadc unbalance in the
output tubes has occurred in the course of use.
In the Final Steps of the Construction section, it is instruc-
ted that both BALANCE ADJ. pots R23 end R24, and both
BIAS ADJ. pots, R25 and R26, be set to mid-rotation
before connecting the unit to the AC line. Be sure this
is done. Immediately afterthe unit is turnedon, perform
balance and bias ad]ustments in each amplifier accord-
ing to the methods and schedule given below.
Instrument Required: VOM or VTVM of at least ±3%
accuracy on DC voltage measurement with alowest DC
voltage range not exceeding 3volts full scale.
a) BALANCE ADJUST METHOD. (Use the BALANCE
ADJ. pot and METER jacks for the particular amplifier.
1or 2, being adjusted. )Set the VOM or VTVM to the
lowest DC voltage raige end at either the plus or minus
DC voltage function. Connect the meter leads to the pair
of METER pin jacks for amplifier 1or amplifier 2on the
rear chassis apron. If the meter deflects to the left of zero,
switch the function to the opposite sign or reverse the
leads. Adjust the corresponding BALANCE ADJ. control
for azero or minimum reading. This completes the bal-
ance adjustment, whereupon the meter leads can be re-
moved from the meter pin jacks.
b) BIAS ADJUST METHOD. (Use the BIAS ADJ. pot and
aMETERjackof the pairforthe particular amplifier, 1or
2, being adjusted.) Set the VOM or VTVM at the plus
DC voltage function and the lowest DC voltage range (not
exceeding 3volts full scale). Insert the "hot" meter lead
into either one of the pair of METER pin jacks for the
particular amplifier (1 or 2) being adjusted, and connect
the common or ground meter lead to either of the speaker
connection terminals marked "G" (ground). Set the cor-
responding BIAS ADJ. control forameter readingof 0.63
volt. This completes the bias adjustment, whereupon the
meter leads can be removed.
BALANCE &BIAS ADJUSTMENT SCHEDULE
TIME PROCEDURE
Immediately upon turning amplifier on for the
first time. (Either after completing the kit or
after replacing output tubes.
)
1. Adjust BALANCE amplifier 1
2. Adjust BIAS amplifier 1
3. Adjust BALANCE amplifier 2
4. Adjust BIAS amplifier 2
Repeat steps 1, 2, 3, and 4
15 minutes later Repeat steps 1, 2, 3, and 4
2hours later Repeat steps 1, 2, 3, and 4
2weeks later Repeat steps 1, 2, 3, and 4
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 nationally by the Amperex Electronic Corp-
oration (230 Duffy Ave. ,Hicksville, L. I., N.Y. )and
MuHard 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 ata signal developing 50watts
output per channel as well as the corresponding lkc signal
voltages.
To isolate the source ofunusual humor noise in your sys-
tem, first turnoff theACpowerand thenunplugthe 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.
4

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The
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^
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2.
Similar
to
the
above,
mount
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50
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pots,
R
23
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R
24
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shoulder
on
the
fibre
washers
should
seat
in
the
mounting
holes,
if
the
Ncrt®
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orientation
and
location
in
figure
*
3.
Press
each
pot
firmly
assembly
is
properly
completed,
each
jackwill
be
insulatedfrom
the
chassis.
towards
the
chassis
until
a
click
is
heard
and
is
held
firmly
to
the
chassis.

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3.
Connect
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7"
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wire
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XV4-2
(S2)
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one
end
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4"
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(
)
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Fig.
3.
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7"
piece
of
orange
wire
from
XV6-1
(C)to
J5(S1).
leads
together
and
run
them
along
the
chassis
as
shown.
Connect
the
re-
maining
end
of
the
yellow
wire
to
XV6-2
(C)
and
the
other
end
of
the
brown
wire
to
XV6-7
(C).

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