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In either type of i.nstallation, the console should be fastened
securely to the control desk after the wi:ring is complete.
This
is facilitated by the holes in the center of several of the large
dimples jn the cabinet base.
The wiring adjacent to the mounting
holes should be fully protected during the securing operation.
The transistor amplifiers and the power sup;Jly used in the conso:le
have been designed for reliable operation at temperatures up to
55°
C.
or 131°
F.
No special ventilation is required.
HO.lever,
prolonged sine wave testing (especially in the monitor amplifiers)
should be avoided to allow heat, built up in the power output
transistors, to be dissipated.
See the instruction books provi-
ded at the end of this manual for more information.
Cable and conduit layout is of utmost importance in the studio
installation.
Good results, with a minimum of noise and cross·_·
talk, require careful planning and construction.
A system hastily
installed, VIi thout thorough planning., i.nvari.ably results i.n con·_·
ti.nuous trouble unti.l rebuilt.
First, the matter of signal levels:
Cables should generally be
di. vided i.nto three groups, low level cabl es may include levels
from ·-60 DBi'1 to-·20 D13N.
Nedium] evel cables may include levels
from ·-20 DBrl to +14 DEl'i.
The high level cable> may include levels
from
+14
DEI"! to +40 DBN.
AC power wiring should be run in sepa·-
rate cables.
vJhenever possible, do not run any of the four cables listed in a
conduit along with cables of different level classification.
If
two or more cabl0s must be run in a COilliilon conduit, never exceed
a difference of 40 db in level bet,veen the highest and thE) lowest
level in either cable.
Use high quali.ty shielded twisted pair for.
all audio wiring, such as Gates catalog number 1261.
For all
microphone wiring and long medium level cable and conduit runs
the use of rubber, p19.stic or cloth covered shielded pairs elim--
inates multiple ground .Loops and the resultant noise problems.
Gates catalog number 8440 microphone cable is reco=ended.
In parallel cable runs of different levels, the most important
aid i.s physical isolation.
Up to six inch spacing is preferred.
If there is not room for this isolation, do not lace all of the
wires in the same cables.
Keep the cables laced separately for
the di.fferent level classi.fications even if two or more must lay
together.
This will give much better isolation than when formed
into one cable.
The deviations from the preferred methods must
not be taken lightly.
Use them only as a last resort, not just
for convenience.
The Executive
6/26/62
-3-
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