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3.
Mode Switch
For normal
stereo
operation,
leave this
switch
in the
"off"
position,
i.e. out.
When
the switch
is depressed,
the "'pre-
amp out" jacks will deliver the identical
signal
to
both
channels
of the power
amplifier. This signal will be the sum of
the left and right channels (mixed) of the
source
(phono,
aux,
FM
or tape play-
back), This same monaural signal wil! be
present at the "rec out" jacks if the mode
switch is depressed while "source" button
is down. There are several applications of
the mode switch:
(a) To
play a monaural
signal source,
such
as television sound, over both
stereo loudspeakers, or to record the
same
on both channels of a stereo
tape deck;
(b) To blend both channels of a stereo
signal
source
for
recording
on
a
monaural tape deck;
(c) To
improve
the listenability of a
weak FM stereo station or a scratchy
monaural
disc; in both cases, switch-
ing
to
monaural
with
the
mode
switch will cause cancellation of some
of the background noise.
Note:
The "'rec out" jacks are affected
by the mode switch only if the
"source'' switch is depressed.
4. Controls
Contour -
The
normal
position for this
control
is
fully
clockwise.
The contour control provides
automatic
compensation
for
the
human
ears'
dispropor-
tionate decrease in sensitivity
to the extreme
low and high
frequencies
at low
listening
levels.
To
use
the
contour
control,
first
turn
it fully
clockwise.
Turn
up the vol-
ume
contro! to normal
maxi-
mum
listening
levels.
Then
turn
the listening
level down
with
the contour
control
in-
stead of the volume
control.
Loudness
compensation
will
take place automatically.
Bass -
Permits
boosting
and
at-
tenuating
of lower
frequen-
cies within + 9 dB at 20 Hz.
Permits
boosting
and
at-
tenuating of higher frequen-
cies within + 9 dB at 20 kHz.
Volume -
Controls overall listening lev-
el.
Balance -
Permits correction of channel
imbalance.
Treble -
Contour
characteristics
5. Headphone
Plugging a headphone into the front panel
jack provided
automatically
cuts off the
signal from the preamplifier output to the
power amplifier. Always turn the volume
control
down
before
plugging in or un-
plugging headphones.
Note:
The contour control has no ef-
fect on headphone listening.
FM Tuner Section
The highly unconventional
tuning dial of
the Nakamichi 630 was designed to great-
ly simplify
FM
station selection.
instead
of
the
usual
tuning
meters,
the
630
utilizes a series
of indicator
larmps for
precise tuning indication.
stereo
ew
tuning
<=
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.
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1. Indicator Lamps
Stereo -
lights to
indicate
FIA
multi-
plex stereo reception
Tuning-
the three lamps in the center
of the group
are fa station
selection; if one of the green
lamps
are
on,
the tuner
is
slightly
off-station, ined you
should
turn
the
dig
in the
direction indicated by the ar-
row
above
the lamp the red
lamp
lights to indiate
that
the
tuner
is
centeecd
and
"locked
in'' to the clesired
station.
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