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12
Script Holder
As shown in figure 1, an aluminum bracket is
mounted on the right hand side of the control panel.
This bracket is designed to hold the clip board which
is used in broadcast stations to hold the standard
8V2
x
II"
script sheets.
Overall System
As shown in the block diagram, figure 2, the BC-3C
Consolette provides eight mixing channels. The out-
put of each mixing channel may be switched to either
a program or audition bus by means of the key
switches 5S5 through
5S12.
The program bus con-
nects through a booster amplifier, master gain control,
progcam amplifier and 6db isolation pad to the pro-
gram line output terminals. The VU meter and ex-
ternal monitor bridging pad are connected across the
output of the program amplifier.
The monitor channel consists of a booster amplifier,
monitor gain control and monitor amplifier. The in-
put selector switch gives the choice of monitoring the
output of the program amplifier, the output of the
audition bus, an external input or a turntable cue.
The output of the monitor amplifier connects through
the speaker muting relays to the control room and
studio speaker output
terminals.
These relays also
actuate the ON AIR warning light
relays.
Cue feed to the remote line is supplied by the
monitor
amplifier through an isolation pad.
T
he two
remote line switches select headphone monitoring, cue
feed and program receive functions.
INSTALLATION
Location of ConsoleHe
The BC-3C Consolette may be installed on any flat
top desk or table of suitable size. A minimum of
Vz
inch clearance should be allowed between the rear of
the consolette and the wall. Refer to the typical in-
stallation and dimensional drawings figures 15 and 16.
Removal of Shipping Bolts
Remove the red nuts and lockwashers located at
each end of the preamplifier shelf. Remove the ship-
ping screw by pulling through holes on the underside
of the consolette housing. Removal of this shipping
hardware permits the preamplifier mounting shelf to
float freely on its rubber vibration mounts.
Type of Installation
A typical broadcast installation for a one studio
system using the BC-3C Consolette is shown in
figure 17.
WARNING
Do not remove top cover or open front-
panel with power turned on unless thor-
oughly familiar with this equipment. High
voltages appear on the etched wiring boards
and terminal blocks. Caution must be exer-
cised when replacing tubes or servicing this
equipment with the power turned on.
Tube Installation
Tubes are not supplied with the consolette and
must be ordered as
MI-11486-A.
Insert the tubes in
the sockets as called for on figure 22. Install the
selected 12AY7 (MI-11299) tubes in the socket near-
est the front of the preamplifier and booster amplifier
printed wiring boards. Slip the shields over the tubes
where tube shield ground straps are provided on the
Figure 14-Type 8C-3C Conso/elte with Panel Open
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