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SECTION 3 • OP ERATION
On the upper front pane I, above the five channel mixers are switches that perform input switching
function for each channel. The selector switch on the extreme left is used to swi tch between
stereo microphones in the control room and studio. Lever keys are located above each of the input
channel mixers. With the Channel #1 lever key in the right position, the microphone preamplifiers
feed the left and right program busses. These same microphones will be switched to the left and
right audition busses when the mixer key is placed to the left. The switch to the upper left of
Channel #2 is used to switch the auxi I iary input into thi schanne I. The pairs of switches located
above and between the channel mixers #2 and #3, #3 and #4, and #4 and #5 are switchable into
these channels. The pair of switches above and to the right of the Channel #5 mixer is used for
switching the remote and network lines into Channel
US.
When in the left position, the remote
switch provides pre-hear and cueing faci I ities. In the center pos ition, the inputs are term inated.
When in the right position, the remote line feeds the cue am-'plifier for pre-hear cueing. The pre-
hear cueing is also available on the network input switch. The head phones can also be used to
I.isten to the network when the phone selector is switched to the net position.
The monitor input selector is located on the right lower section of the panel. Input switching
allows stereo monitoring of the audition busses, the program output lines, and an external signal
source. The gain of both the "Ieft"and IIright
II
monitor ampl ifiers is controlled by the dual gain
control located just below the monitor input selector.
The gain control s for the left and right program channel s are located on the lower right section
of the panel.
3. 1
3.2
CHANNEL BALANCE
Once the gain of the left program channel has been adjusted to the desired level,
the inter-channel (left-right) balance can be set by switching the channel' balance
switch to the "null
II
position. This switch is located on the meter pad printed cir-
cuit board fastened to the back of the VU meters. With the switch in the "null"
position, the left channel VU meter is connected between the
FM
left and
FM
right
e.rogram channels, and thus reads the difference in signal levels between channels.
Feed a monophonic recording into the stereo medium level channel and adjust the
level of the FM right program gain control until the VU meter "nulls". This indicates
that the program I ines are balanced within
±
0.5 dB. After the balancing procedure
is completed, the switch should be returned to the lIoperate
ll
position.
CUE SYSTEM
The cue amplifier is used to pre-hear the remote and network lines and for cueing of
the medium level inputs such as, turntable, tape, etc.
The gain control is located between Channel #1 and Channel #2 mixer. The cue
speaker on the console is set up to be muted when the control room microphones are
turned on, however, this muting does not disable the cue position on the phone
selector switch, so it is possible to cue a record by monitoring the cue circuit with
headphones.
The muting has been pre-assigned for the control room and studio speakers. Muting
is accomplished by the two relays mounted on the amplifier chassis and is selected
by microphone input switch.
3-1
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