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mechanical
installation
GENERAL
a)
HEAT
DISSIPATION (VENTILATION):
In
common
with other
electronic
equipment, the
Model HF-89
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
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
a
console,
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
a
console.
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
a
console, 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 a
power
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 a
proper
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
a
thin 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
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
x
1"
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
EICO
Model HF-89
re-
quires 21
5
watts
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 a
preamplifier,
such
as
the
EICO
HF-85,
or
a self-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
a self-powered
preamplifier-control
unit,
touch
one
end
of
a wire
to
the preamplifier
chassis
and theother end
to
the
power
amplifier
chassis.
If
a
spark 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 a
preamplifier,
such
as
the
EICO
HF-85,
normally
the
convenience
outlets
on
the preamplifier
will
be
used.
2
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