Heathkit W-5M User Manual

'
Now
attach
the
four
rubber
feet to the
bottom
cover,
following
Figure
17 for
details
of the
assembly.
Use
6-32 hardware.
This
completes
the
actual
construction
of
the
amplifier.
Before
the
chassis
cover
and
bottom
plate
are
installed,
the
unit
should be
tested
and adjusted.
IMPORTANT
NOTICE
If
the W-5M
Amplifier
is
to be
used
with
the
Heathkit WA-Pl
Preamplifier
or
with any
other pre-
amplifier
which has
ungrounded
filaments
and
draws
its
power
from the
main
amplifier, the
green-yellow
wire
of
the
power
transformer
must
be
grounded
at
the
power
supply
end of
the
ground bus
wire
in
the
amplifier.
Any
of
the
four
ground lugs
on
either
can-type
filter conden-
ser
will
be
perfectly
satisfactory.
Use
of a
separate
self-powered
preamplifier
is
permissible
but
the
green-yellow
power
trans-
former
wire
should
be
grounded as
described
above
to
obtain
the lowest
possible
noise
figure
.
Pins
6
and 7
of
the power socket
should be
jumpered
with a
switch
or wire
to
apply
power
to the
amplifier,
if a
preamplifier other
than a
Heathkit
is
used.
When a
preamplifier
with
a
filament
hum
balance
control (such
as
the
Heathkit WA-P2)
is
used
with the
W-5M,
the green-yellow
transformer
wire
should be
left
disconnected
and taped up
at the
end
to
avoid
short circuits. Dress
the
wire
under the wires
appearing
through
grommet
S
to
hold it
in
place.
Any
preamplifier
requiring
a
separate
power
supply
can
be
used
with the
W-5M
Amplifier
provid-
ing the
AC
and
DC
current
drain does
not exceed the
ratings
listed
in the
chart
below. An
ad-
apter
can
be
wired
to supply the
following
voltages
on
a
6 or 8
conductor
cable:
Pin
1
-
One side
of
filament circuit,
6.3
volts
at
1.0
amp
AC
Pin 2
-
Other side
of
filament
circuit
Pin 3
-
Negative
plate
supply
Pin
4
-
Positive
plate
supply,
380 volts
at
5
ma
DC
Pin
5
-
Positive
plate
supply,
approximately
250
volts at
10
ma
DC
Pin 6
-
AC
switch
terminal
Pin 7
-
AC
switch
terminal
Pin
8
-
AC
line
terminal
Page
23

Heathkit W-5M Specifications

General

Brand	Heathkit
Model	W-5M
Category	Amplifier
Language	English