mechanical installation
GENERAL
a) HEAT DISSIPATION (VENTILATION): In common
with other electronic equipment/ the Model HF-86 pro-
duces ogreat 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 importantthingto remember isthateffective
ventilation requires provision for coal air to 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-86 is available
which will provide a"finished11 appearance as well as
protection when the amplifier is not installed In acon-
sole. Four rubber feet are also provided so that the ampl i-
fier 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 any tube in the ampli-
fier, Furthermore, input and output terminals of the am-
plifier should be accessible to permit easy interchanging
of system components for comparison. If antennas are
strung around thebackof the console in which the ampli-
fier is installed, arrange them so they will not interfere.
c) ELECTRICAL ISOLATION: Torealizethefull benefit
of having apower amplifier physically separate from the
preamplifier-control unit and/or tuner, 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: [f 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 forthe amplifier in
the particular console, the correct procedure for mount-
ing 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
the bottom 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 eacfiof the
marked holes on the shelf to adiameter of l/4M.e) Re-
fasten the bottom plate to the chassis, with the 6#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 it
exactly in the outline previously drawn, g) From the
bottom side of the shelf, insert a^8 Xl11 screw with a
1/211 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 tighten-
ed secure the chassis to the shelf.
electrical installation
POWER
a) POWER REQUIREMENTS: TheEICOModel HF-86re-
quires 115 watts at HO to 120 Yoltsy60 cycles AC,
b) REMOTE SWITCHING: The EiCO Model HF-86 is
provided with its own ON-OFF power switch. If the
HF-86 power amplifier Is being usedwitha preamplifier,
such as the -EICO HF-85, or aself-powered tuner-pre-
amplifier, the line cord of the HF-86 Is inserted in a
switched 117VAC convenience outlet In the control unit.
Turn the powerswitch on the HF-86 to ON. Note: When
using aself-powered preamplifier-control unit,, touch
one end of awire to the preamplifier chassis and the
other end to the power amplifier chassis. If asparkoc-
curs, pull out the HF-86 line cord plug and re-insert it
with the prongs reversed.
c) CONVENIENCE OUTLETS: When the HF-86 is used
with apreamplifier, such as the EICO HF-85, normally
the convenience outlets on the preamplifier will be used.
However, the HF-86 outlets 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 conductor
shielded cable. Unless the source has alow impedance
output, such as acathode follower (with which up to 50
ft. of cable can be used), use the shortest possible con-
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