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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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