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6. BALANCE
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7. TAPE MONITOR
and connect the tape decks to the switch-box. (Example: the
Radio Shack #42-2105 switch-bdx contains facilities for
monitoring and copying among three tape decks.)
8. INPUT SELECTOR (CD, Video, Phono, AM, FM)
These interlocked buttons select the input signal for
listening and for recording. This is the signal that you will
hear, assuming that the TAPE MONITOR is disengaged.
Regardless of the setting of the TAPE MONITOR switch,
the selected input signal will also be fed to the TAPE OUT ~
jacks for recording or signal-processing.
9. MONO
This button blends the two stereo channels together to
produce monophonic sound. This blend minimizes rumble
and surface noise in old monophonic records. The button
must be OUT for normal stereo listening.
The MONO button also disables the stereo FM circuits
in the tuner. Normally the tuner receives monophonic trans-
missions in mono and automatically switches on its multiplex
decoding circuits when a stereo FM broadcast. is received
(as shown by the FM STEREO indicator). But when a very
weak FM stereo signal is received, it may be excessively
noisy because of the multiplex encoding technique used for
stereo broadcasting. In that case, depress the MONO button
to lock the tuner in the mono mode, in order to obtain
consistently quieter and cleaner sound.
Remember to disengage the MONO button when you
re-tune to a stronger signal. As long as the MONO button
is engaged, no broadcasts can be received in stereo.
If you record a broadcast with the MONO button en-
gaged, the recording will be in mono. If you record the signal
from any other input (Phono, CD, et al), the effect of the
MONO button depends on whether the TAPE MONITOR
button is engaged. If the TAPE MONITOR is not engaged,
then pressing MONO will blend the input signal into mono,
and the monophonic signal will be recorded. If the TAPE
MONITOR is engaged, then pressing MONO will affect only
the sound that you hear as it returns from the recorder; the
signal going to the tape will be recorded in stereo.
10. LOUDNESS
This button engages a "loudness compensation" circuit
which, at low-to-medium settings of the Volume control,
boosts the bass response of the amplifier in order to com-
pensate for the human ear's diminished sensitivity to low-
frequency sounds at low loudness levels. The circuit also
provides a slight treble boost to overcome the "masking"
of subtle high-frequency details by background noise.
Instead of using this button, you may prefer to use the
tone controls to obtain the tonal balance that sounds most
natural to you, at any volume level.
11. VOLUME
The Volume control adjusts the overall loudness level of
the sound. It has no effect on the level of the signals fed to
the TAPE OUT jacks for tape recording. The Volume control
is designed for accurate tracking of its two channels, so that
the stereo balance will not shift noticeably as the loudness of
the sound is varied.
12. TUNING DISPLAY
The display shows the broadcast frequency to which the
receiver is tuned. On the FM band the last digit will be either
0 or 5, since tuning occurs in increments of 0.05 MHz.
13. CENTER-TUNE INDICATOR
This light glows when the tuner is accurately tuned to
the center of an FM station's broadcasting channel.
14. FM STEREO INDICATOR
This LED illuminates when a stereo FM broadcast is
being received and decoded by the tuner's multiplex decoder
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