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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
a console, itshould
be
situated preferably
on an
open
surface.
An
attractively
finished
matching cover
for
the
MODEL
HF-87
is
avai
I
able,
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
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
a
console,
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
a
power
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 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 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
a
diameter
of 1/4".
e)
Refasten the
bottom
plate
to
the
chassis,
with
the
six
*8
x
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 itexactly
in
the outline
previously drawn,
g)
From
the
bottom
side
of the
shelf,
inserta #
8x
Pscrew
with
a 1/2"
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
1
10
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
a preamplifier,
such
as
the
EICO
HF-85,
or a
self-powered tuner-pre-
amplifier, the
line
cord
of the
HF-87
is
inserted
in
a
switched
1
1
7V
AC
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
a wire
to
the preamplifier
chassis
and
the other
end
to
the
power
amplifier
chassis.
If
a spark 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 a
preamplifier,
such
as
the
EICO
HF-85, normally
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