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mechanical
installation
.
GENERAL
a)
HEAT DISSIPATION
(VENTILATION):
In
common
with
other electronic
equipment,
the
Model HF-35
produces
a
great deal
of
heat
In
normal operation.
Unless contin-
uous
and adequate
air
Flow
is
obtained around
the
heat
producing elements,
these
elements wi
1
1
overheot and
their
useful lifewill
be
greatly curtailed,
Adequate
venti lotion
will
be provided
rf
the amplifier
is
installed
in
an
open-
back
console provided
that
the top
of the amplifier
isspaced
at
least
two
inches
below an/
shelf
mounted above
It,
If
the
cabinet
is
enclosed
ot
the
rear,
provide
several large
hales 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 impor-
tant thing
to
remember
is
that effective ventilation re-
requires provision
for
cool
air
to
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-35
is
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
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 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
the
back
of the
console
in
which
the
ampl
i-
fier
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
amp
It
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
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 other
mounting
surface
in
which
it
is
desired
to
mount
the amplifier.
With
a
sharp pencil,
placed
with
its
point
directlyagainst
the
edge
of the
lower surfaceofthe bottom
plate,
draw
the
outline of the
bottom
plate
on
the shelf
and
also
mark
the positions of the
two extreme
holes
on
both
the long
sides(front&
rear),
d)
Remove
the
bottom
plate
and
drill
each
of
the
marked
holes
on
the
shelf
to
a
diameter
of
1/4",
e)
Refasten the
bottom
plate
to
the
chassis,
with
the 6
^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
it
exactly
in
the outline
previously
drawn,
g)
From
the
bottom
side of the shelf,
Insert
o^8 X
1"
screw 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
k
the
shelf.
electrical
installation
.
POWER
)
POWER
REQUIREMENTS:
The
E1CO
Model HF-35
re-
quires
130 watts
at
1
10
to
120
volts,
60
cycles
AC,
*b)
REMOTE SWITCHING;
The
EICO
Model
HF-35,
al-
though
not
provided with
its
own
ON-OFF
power
switch,
has provision
for
remote
switching, through an
octal
socket
mounted
on
the chassis.
Pins
6
and
7 of the octal
socket
are internally
connected
to
the
ends of a break
In
one
power
transformer
primary
lead
and
are external
ly
con-
nected
together
bya
jumper
in
a
male
octal
plug
Inserted
In
the octal socket.
When
this
male
plug
Is
removed
pi
a
6
and 7
may
be
brought out
to
an
external
AC
switch,
usually
in
a
preampl'fier
unit
This
is
one
of the
connect-
Ionfgnctions
accomplished with
the octal
plug-ond-cable
attached
to
the
EICO HF-65A
preamplifier-control
unit.
If
the
HF-35
power
amplifier
Is
being used with a
self-
powered preamp
l
if
ier,
such
as the
EICO
HF-65,
or
a
self-
powered
tuner-preamplifier,
the octal plug furnished
with
the
HF-35
remains
Inserted
In
the octal socket
(to
connect
the
primary
of the
power
transformer
to
the
AC
line
and
to
ground
one
side of the
filament
winding) and
the
line
cord
of the
HF-35
Is
inserted
in
a
switched 117
VAC
conven-
3
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