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Again, proper phasing must be obta1ned betvleen microphones for
best operation.
Switches S11 and 814 perform the same functions as S9 and S12
respectlvely, as explained under channel 1..
Channel
3
micro·-
phones should be in the same studio as the speakers connected
to mute when the channel
3
lever s1l1i tch is operated.
Again,
phasing of inputs is important and microphone polarity should
be closely observed.
Connections should be made as follows '.'
Microphone
Terlll2:nal Block
_1
5
Left
9A
9B
5
Right
lOA
lOB
6
Left
llA
llB
6
Right
12A
12B
Drawing 813 7290 001 shows the above microphone connections.
Provision i.s made for four stereo turntable inputs, eaoh of
\,hich can be mli tohed to mixers 4 or 5.
Turntabl e inputs are
medium level (..-20 DBI1) 600 ohm unba.lanced.
I f
the output of
turntable preamp is unbalanced, the common side should be con-
nected to the common si.de of the input termi.naJ.s (ROI, B) on
terminal block ;;. . As with mi.crophone
inpu'~s.
polari.ty of the
turnto.'blo
1.np::::8
r:u.st be observed. to insure:;
t::.2:: !li.ght SJ:;!,Q
left channel si.gnals are in proper phase relationship.
This
requires checki.ng of all the
~dring
from the stereo pickup,
through the preamp to the console for proper connections,
Inputs to the turntable chann.els should not be ground.ed ex·-
ternally,
Isolation transformers may be used. if necessary
to isolate external groUllds or to connect i.nputs that should
not be grounded to the unbalanced turntable i.nputs.
Turntable inputs connect to terminal block
3
as follows .• ,
.Tur~le
.Terminal !i
1
Left Channel
lA
IB
1
Right Channel
2A
2B
2
Left Channel
3A
3B
2
Right Channel
4A
4B
3
Left Channel
5A
5B
3
Right Chanr!el
6A
6B
4
Left Channel
7A
7B
4
Ri.ght Channel
8A
8B
See the section on OPERATION for detai.ls on switching functions.
6/26/62
-9-
The Executi.ve
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