Part B: Installation
MECHANICAL Vertical
space
of
two
standard rack units
(3
l/2"/8.9cm) is required
for either the
INSTALLATION
422A or the 424A.
Mounting the unit directly over large
heat-producing
devices like
a vacuum-tube
power
amplifier may shorten component life
and is not
recommended. Ambient
temperature
should not exceed II3°F
(45°C) when
equipment
is powered.
ELECTRICAL
AC
Power
INSTALLATION
The
power
transformer can be connected for
115
volt or
230
volt
50
or 60Hz
AC
operation by means
of
a selector switch on the
rear
panel.
TYPE 18/3
SVT CORD,
TYR-.
(3
x
.82
mm*)
CONDUCTOR
WIRE COLOR
Normal Alt
L
LINE BROWN BLACK
N
NEUTRAL
BLUE
WHITE
E
EARTH GND
GREEN-YELLOW GREEN
Fig.
B-l:
AC
MAINS LINE CORD
DETAIL
WARNING!
THE
GROUND (EARTH) PIN ON THE PLUG SERVES TO RELIABLY
GROUND THE CHASSIS WHEN
CONNECTED TO A SUITABLY GROUNDED
RECEPTACLE. IF
THE
GROUND
MUST BE DEFEATED FOR HUM
OR
NOISE
REDUCTION, SECURELY
CONNECT THE CHASSIS
TO
A
RELIABLE EARTH
GROUND TO MAINTAIN PROTECTION FROM
ELECTRICAL SHOCK
CAUSED BY ANY
FAULT WHICH
COULD
CAUSE
THE CHASSIS TO BECOME DANGEROUSLY CHARGED.
Control Loop
Bass
Rolloff
The compressor/limiter
control loop
is
ordinarily operated with
a
bass rolloff
which simulates the response of
the
ear and results
in
a
more
natural
sound.
However, certain applications demand
that
the 424A perform an accurate
peak
limiting
function.
This
requires
a
"flat" response from the
control
loop.
The bass rolloff network
can be
jumpered
out on
the circuit board(s) inside
the
424A. Each
unit is
shipped with
the jumpers
in
the "rolloff"
position. To
restrap to
the "flat"
position,
move the
jumpers
according to Fig.
B-2,
following the User
Access instructions in Part D.
7
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