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mechanical
installation
GENERAL
a)
HEAT DISSIPATION (VENTILATION):
Incommonwith
Other electronic
equipment,
the
Model HF-14produces
a
great deal
of heat
In
norma!
operation.
Unlew
contin-
uous
and adequate
air.
flow
Is
obtained around
the
heat
produclngelementj,
these
elements
will
overheat
and
their
useful
life
will
begreatly
curtailed.
Adequate
ventilation
will
be provfded
if
the amplifier
is
Installed
in
an
open-
back
console provldedthat
thetopof
the amplifier
is
spac-
ed
at least
two
inches
be few 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.
Al dn
alternate,
holes
may
be
provided
In
the
sides,
bottotn,or
topof
the cabinet.
The
Important
thing
to
remember
Is
that
effective ventilation 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-14
Is
available
which
will
provide a
"finished
11
appearance
as
well
as
protection
when
the
amplifier
Unot
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
ampli-
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
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
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
fellows:
a)
If
the
rubber
feet
have been
inserted
In
the
bottom
plate,
remove
them
(pry
out with a
thin screwdriver),
b)
Remove
the
6
screws
which
fasten
the
bottom
plate
to
the
chassis,
c) Place the
bottom
plate (bumps feeing 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
directly against the
edge
of the lowersurface of
the
bot-
tom
plate,
draw
the outline
of
the
bottom
plate on
the
shelf
and
also
mark
the positions
of
the four
outer
holes,
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 2
#
8
x 3/8
screws
pre-
viously
removed,
using the holes at the center,
f)
Re-
place 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 1/2"
flat
washer
against the
head
through
each
of
the four
holes.
These
screws
engage
the
stamped
nut
over each hole
In
the
chassis
flange
and
when
tightened secure the
chassis
to
the
shelf.
electrical
installation
POWER
A)
POWER
REQUIREMENTS:
The
EICO
Model HF-14
re-
quires
65
watts at
1
10
to
120
volts,
60
cycles
AC.
b)
REMOTE SWITCHING:
The
EICO
Model HF-14,
al-
though not privlded with
its
own
ON-OFF
power
switch,
mounted on
the
chassis.
Pins
6
and 7of
the octal
socket
are internally
connected
to
the
ends of a break
In
one
power
transformer
primary lead
and
are externally
con-
nected together
by
a
jumper
in
a mole
octal
plug
Inserted
in
the octolsocket.
When
this
male
plug
Is
removed,
pins
6 and
7 may
be brought out
to
an
external
AC
switch,
usually
In
a
preamplifier
unit. This
Is
one
of the
connect-
ion
functions
accomplished with
the octal
plug-ond-cable
attached
to
the
EICO
HF-65A
and
HF-61A
preamplifier-
control
unit.
If
the
HF-14
power
amplifier
is
being used
with
a self-powered
tuner-preamplifier,
the octal fur-
nished with the
HF-14remains
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-14
Is
Inserted
in
a switched
117VAC
convenience
outlet
In
the control
unit.
Note:
When
using
a
self-powered preamplifier -control
unit,
touch
one end
of
a wire
to
the preamplifier
chassis
and
occurs,
remove
the
HF-14
line
cord plug
and
ra-lnsert
It
with
the prongs
reversed.
a)
POWERING
AUXILIARY
PREAMPLIFIER:
The some
octal
socket
provides
all
necessary filament
and
B+
vol-
tages
fer
operating
an
auxiliary preamplifier-control
unit,
6.
3
volts
AC
filament voltage, at
1
ampere,
may
be ob-
tained from
pins
1
and
2i
pin
number4
on
the
socket sup-
plies
350
volts
DC,
at
a
maximum
current of lOmllll-
amperes;
and
pin
3
Is
connected
to
ground.
As
stated
above,
control of
1
17
volts
AC
line
power
to
the
power
z
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