Table of Contents
Advertisement
mechanical
installation
GENERAL
a)
HEAT
DISSIPATION (VENTILATION);
In
common
with
ofher electronic
equipment,
the
HF*52
produces
a
great
deal of
heat
in
normal operation.
Unless continuous
and
adequate
air
flow
is
obtained around
the heat
producing
elements,
these
elements
will
over-heat and
their useful
life
will
be
greatly curtailed.
It is
useful
to
understand
the process of
connection
where-
by
heat
is
removed
in
judging the
suitability
of a location.
Air
heated
by
the
heat-producing elements expands and
rises;
cool
air
Is
drawn
from
beneath
to
take
the
place
of
the
heated
air»
In
this
manner,
a stream
of
air
is
set
in
motion
which
continually
removes heat
from the ampli-
fier,
(In
particular,
we
are
mainly concerned
with
the
ma
or
heat-producing
elements; the
two EL34
output tubes
and
the
GZ34
rectifier
tube.)
If
there
Is
any Impediment
to
or constriction of the
air
flow, the
essential
process of
heat removal
will
be
adversely affected.
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
alter-
nate, holes
may
be provided
in
the
sides,
bottom,
or top
of the cabinet.
The
Important thing
to
remember
is
that
effective ventilation requires provision
for
cool
air to
en-
ter
at the
bottom and hot
air to
leave
at the top.
If
the amplifier
is
not
installed
in
a console,
it
should
be
situated preferably
on an open
surface, not
on
a
shelf of
a bookcase.
An
attractively finished
matching cover*
for
the HF'"52
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
pro-
vided
so that
the amplifier will
not
mar
the surface of fur-
niture
on which
it is
placed,
(*Model
E"l)
b)
EASY ACCESS
TO CONTROLS;
Mount
the amplifier
at a
height
which
will
permit easy manipulation of
the
con-
trols.
Tuner
controls
should be located nearby.
c)
ACCESSIBILITY
TO
PARTS:
Tubes are
the
most
fre-
quently replaced
items
in
electronic
equipment.
If
the
amplifier
Is
Installed
in
a console,
sufficient
space should
be
alloted
to
reach
and remove any
tube
in
the amplifier,
Furthermove,
input
and
output
terminals of the amplifier
should
be
accessible
to
permit easy Interchanging
of sys-
tem components
for
comparison,
and connection
or dis-
connection
of a portable tape recorder
which
is
stored
a-
way
when
not inuse.
If
antennas
are strung
around theback
of the console
in
which
the amplifier
is
Installed,
arrange
them
so
they
will
not
Interfere
with access
to
the amplifier.
d)
ACOUSTICAL
ISOLATION;
If
amplifier
and
speaker
are
Installed
in
the
same
cabinet
(not
recommended),
pro-
vide
sufficient
separation
to
minimize mechanical speaker
vibration
reaching
the amplifier.
The
minimum
separation
is
about one
foot.
CONSOLE
MOUNTING
a)
Operations on console
front
panel preliminary
to
am
-
plifier
mounting
;
(1)
Tape
the
panel template provided
to
the
face
of the
console
so
that the top of the
mounting
surface
line
on
the
template
is
level
with
the top of the
amplifier
mounting
shelf.
(2)
Use an
awl
or a
nail
to
pierce the centers of the
five
5/8" diameter
holes
for
the
controls
and
the
two
small holes
for
mounting
the control
plate,
to
transfer their
locations
to
the
console panel
be-
neath,
(3)
Remove
the
panel template.
(4)
Drill
the
holes
for
the
panel
controls
only
(the
two
small
holeswhich
have been marked
are
for
wood
screws).
b)
Amplifier
mounting
in
console:
(1)
Pull
off
the
con-
trol
knobs
(a
second
set
of
knobs with
long shanks
has
been
provided
for
console
installation).
(2)
Remove
the
control plate,
which
is
attached
to
the
chassis
apron by
two
screws,
(These
may
be discarded
since they are
un-
suitable
for
attaching the
control plate
to
the
console
panel
and two
^4
X
3/8
wood
screws
have been
supplied
for
this
purpose.)
(3)
Fasten the control plate
to
the
con-
sole
panel with the 2
^4
X
3/8
wood
screws,
(4)
If
the
rubber feet
have been
inserted
in
the
bottom
plate, re-
move
them.
(They
may
be
pried out
with
a
thin
screw-
driver.)
(5)
Place
the unit
on
the
mounting
shelf
and
slide
it
as
far
forward
as
possible, so that the controls
penetrate
the
panel
holes
as for as possible,
(6)
Place
a long
shank
knob on each
control, pressing
each knob
toward
the chassis firmly so that
each
control shaft enters
fully into
its
knob,
(7)
Draw
the chassis
back evenly
and
carefully
until
theback
rimsofall
theknobsare
equally
spaced
from the
control plate
about
1/8".
(8)
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 chassis
shelf.
(9)
Now
remove
the
knobs and
take the
chassis off
the
shelf.
(10)
Remove
the
10 screws
which
fasten the
bottom
plate
to
the
chassis.
(11)
Place
the
bottom
plate exactly
in
the
out-
line
drawn on
the shelf
(bumps facing
up)
and mark
the
positions of the
two
holes
on
the
left
side
and
the
two
holes
on
the
right side.
(12)
Remove
the
bottom
plate
and
drill
each
of the
marked
holes
on
the shelf
to
a diameter
of 1/4".
(13)
Refasten the
bottom
plate
to
the
chassis,
with
the
6
^8
X
3/8
screws previously
removed,
using the
3
holes
at
the rear
and
the 3 holes at the front of the
chassis,
(14)
Replace
the chassis
on
the
shelf,
positioning
It
exactly
in
the outline previously
drawn, and
restore
the
knobs.
This
time
make
sure that the indicator
doton each knob
agrees
with
the control position.
(15)
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
left
and
right
side holes.
These screws
engage
the
stamped
nut
overeach
hole
on
the
chassis
flange
and
when
tightened secure the
chassis
to
the
shelf.
Advertisement
Table of Contents
