What the Front Panel Controls do
and How to use Them
INPUT SELECTOR
The six position IN-
PUT SELECTOR con-
trols DC voltage fed to
FET analog switches
which choose the input
program selected. The
INPUT SELECTOR is
turned to:
AUX 1: to connect the output from any high level
program source requiring flat amplification to the
high level input stage. Such a source could be
another tape recorder, a television set, etc. The input
impedance is 100,000 ohms
AUX 2: same as AUX 1
AM: to connect the AM tuner circuits to the
amplifiers and loudspeakers
FM: to connect the FM tuner circuits to the
amplifiers and loudspeakers
PHono 1: to connect the output of magnetic
phono cartridge plugged into PHono 1 to the low
level amplifying stages. The response of these
stages has been shaped to precisely conform to
revised RIAA standards. The input impedance is
47,000 ohms, 87 pf
PHono 2: Same as PHono 1
Pushbuttons
IMPORTANT: When the MAC 4100 is operated with
either MONITOR pushbutton at the in position, the
program heard will be that from the tape recorders
only. Signal from any other source will not be heard
from the loudspeakers. To hear any other source,
make sure the MONITOR pushbuttons are OUT.
The MONITOR switches are mechanically in-
terlocked to prevent simultaneous monitoring from
two tape recorders. If one button is at the in posi-
tion, it must be pushed again to release it to the out
position before the other button can be pushed.
The MAC 4100 is designed so it may be used with
two tape recorders. The four upper left pushbuttons
on the front panel control the signal output of these
recorders. They permit playback of either recorder,
monitor of either recorder as recordings are being
made, or copying of tapes from one recorder to
another while listening to a separate program.
MONITOR TAPE 1 pushbutton out: The program
source as selected by the INPUT SELECTOR is fed
to the power amplifiers and heard through the
loudspeakers; pushbutton in: Signal from a tape
recorder plugged into TAPE 1 IN Is fed to the power
amplifiers and heard through the loudspeakers.
MONITOR TAPE 2 pushbutton: Functions similarly
to monitor Tape 1. It also controls the program from
a tape recorder plugged into the front panel TAPE IN
and OUT jacks. When a tape recorder is plugged into
the front Jacks all the facilities normally fed to TAPE
2 on the rear panel are automatically transferred to
the front panel. The tape recorder plugged into the
TAPE 2 IN and OUT jacks on the rear panel Is
automatically disconnected.
TAPE COPY T1 - T2 pushbutton in: connects the
output from tape recorder 1 to the input of tape
recorder 2 without affecting the program being
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