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The VGry obvious Hothods of operation will not be coverGd,
sinco thoy are COLwon knowlGdgo, or have been covered. in pre··
vious sGcti.ons of this instruction book.
TRilNi:3ISTOR AM:FUI<'IER 01
~(CUITRY
ConplE: to details on tho vari.ous anplifiers used in tho console
will be found in tho individual instruction books inoluded in
tho back of this nanual.
Hovwver, a word h0ro about the c ir-
cui try wiJ.l ai.d in explaining overall console setup.
The pre--
anps, monitor booster amps, cue--int0rcon amp and the nonitor
amps, helve transfornerl0ss output circuits.
Grounding of ex-
ternal Hiring is critical for best noise figures and to avoid
crosstalk, especially i.n the high gain cue·-jnt0rCO::l anp.
I f
modificat~ions
arc; Dade on the consolG, caro sllould be exercised
to insure
that
unvJan'ted grounds do not enter the picture"
Under
no circuDstcmces should the
~:lOnitor
spGaker wiring be groundod
8xternally.
CUE-IH'1'ERCOl'1 SYSTEI1
--------
..
--
Re.i'crc,nce to tb; schcc,atic, drawing 837 9345 001, of thE: CUE:-
intercoD elBplifier; and to drawing 852
585LJ
001,
the ov"ra11
consolo scheDa'tic for th0 wiring of thi,s sys't2m; will aid in
unders tending
tiw
opera t ion of ths cue··-interc OIll systaLj.
An interstage volu[)e control, rc·notely nonncod on the front
panel
' 1
h01ps ToziuCG
nol.80
at norD21 operating levels<I
'llne i.neoDin0;
TC!:10t;c~
.linGs nor:waJly operate Hi th a sj gnaJ 10vsl
of up to +S-VU.
This level is padded down, to a level suf"fi-
ci,cntly 1 o
v·,
to pr(;:vclrt overloading the cue 8.L.1.tJlifier, \ihen
liste:ning to the r\;Dlote li.nes.
rrhcsu pads consist of the 620
ohIJ rosistor
~lcross
the input of each
J::dL10t0
linG and "the 5100
OhI.:1
resistors in suries
v,Tith 8ach 8i.d8 of tb8
line..
These
pads
are built up on 838, the cua·-intorcoIll i.nput selector switch,
located on the front panel.
These pads also give i8010tion
botwsc;H lines
vlhem
no:ce than ono line is s\l1 tched. into the cue
amp.
The Llaximm gain oJ this
9.lU __
liii.er is appro.xi.J:lJ.tely
90
db.
Since the input a:ad
out;,put
of tho
aIi1p1ifi-JT COllUS
in close
proximity 3.t the talk···listen r·elay (K5), wi.re dress is very
iDpOrGent here.
The Grounding of tho cue·-intercol:) system is
also very cri.tical.
Do not allow any part; of the external
speaker or oth()r S;),st()D to be grounded.
They are grounded i.n
the console.
ShiE:lding of all 8xternal spGaker lines is ne-
cessary to prevent hUB and possible regen"ration.
~rhe
f
rcqucmc;y r()sponse of the amplifier is ro118d of
f
sever()ly
on both ends of the sp8ctrum to provide the best cODpronise
of cUGing and intercom functions.
Do not atteLlpt to alter it
vIi thout taki.ng a.11 of the circui.t requirements into considera·-
tion.
The Executive
6/26/62
--17-
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