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Heathkit AR-14 - Operation

Heathkit AR-14
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Page
53
OPERATION
Refer
to
Figure
10
for
the
location
of
the
front
panel
controls.
SOURCE SWITCH
NOTE:
This
is
a
three
wafer
switch;
it
allows
the
inputs
of
both
channels
to
be
selected
si-
multaneously.
It
also
turns
the
38
kc
oscillator
off when
inputs
other
than
stereo
FM
are
used.
When
the
SOURCE
switch
is
in
one
of
the
mono-
phonic
@
positions,
the
input
signals
from
both
the
left
and
right
channels
will
be
com-
bined
and
heard
in
both
the
left
and
right
speak-
ers.
In
the
stereo
@
positions,
all
signals
from
the
left
Channel
Inputs
will
be
heard
only
in
the
left
speaker,
and
all
Right
Channel
signals
will
be
heard
only
in
the
right
speaker.
In
the
monophonic
@
FM
position,
the
same
signal
is
present
at
the
Left
and
Right
output
sockets.
In
the
stereo
@
FM
position
(when
tuned
to
a
station
that
is
broadcasting
stereo),
one
channel
signal
is
heard
in
the
left
speaker
and
the
other
channel
signal
is
heard
in
the
right
speaker.
NOTE:
The
@
FM
position
should
only
be
used
when a
station
is
broadcasting
stereo;
other-
wise,
subchannel
noise
may
be
heard
on
regular
FM
programs.
Also,
noise
may
be
heard
from
stations
that
broadcast
a
Subsidiary
Communi-
cations
Authorization
(SCA)
signal.
TREBLE
BASS
0
VOLUME
The
dual-concentric
clutched
VOLUME
control
allows
the
listening
level
of
each
channel
to
be
adjusted
simultaneously
or
individually.
Max-
imum
volume
is
obtained
when
the
knobs
are
rotated
fully
clockwise.
BASS
CONTROL
AND
SPEAKER
ON-OFF
SWITCH
The
BASS
control
is
of
dual-tandem
construction.
The
low
frequency
response
is
simultaneously
varied
by
the
same
amount
in
both
channels.
Flat
response
is
obtained
when
the
knob
is
at
approxi-
mately
12
o'clock.
Clockwise
rotation
produces
boost,
and
counterclockwise
rotation
produces
cut
of
the
low
frequencies.
Pulling
the
control
knob out,
disconnects
the
speakers
and
allows
private
listening
with
headphones.
TREBLE
CONTROL AND POWER
ON-OFF
SWITCH
The
TREBLE
control
is
of
dual-tandem
con-
struction.
The
total
response
is
simultaneously
varied
by
the
same
amount
in
both
channels.
Flat
response
is
obtained
when
the
knob
is
at
approximately
12
o'clock.
Clockwise
rotation
produces
boost,
and
counterclockwise
rotation
produces
cut
of
the
high
frequencies.
The
On-Off
switch
is
located
on
the
TREBLE
control.
Pull
the
TREBLE
control
knob
out
to
turn
the
Receiver
ON,
and
push
the
knob
in
to
turn
it
OFF.
VOLUME
PHASE
TUNING
Figure
10

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