Circuitry highly resistant to
performance deterioration
caused by
control wear
FRONT
PANEL
DESCRIPTION
REAR
PANEL
DESCRIPTION
General
l2dB available gain
Very low
noise and distortion
High
slew rate for minimum
TIM (SID)
"Peak-stretching” overload lamp
warns
of clipping
anywhere in equalizer before
distortion
is audible
Industrial-grade parts and construction
Extremely
easy
service
access
RFI
suppression on input, output,
and power leads
Balanced
output optional (order
retrofit kit
as
required)
The
INPUT
control adjusts the drive level
to the equalizers.
The
OVERLOAD
indicator monitors all critical points to
warn
of excessive
signal
amplitude due
to
excessive input amplitude or to large amounts of peak boost
equalization.
It indicates peak clipping substantially before any audible effects are
perceived. Overloads
are
eliminated
by
turning
down the
INPUT
control.
The CHANNEL EQ IN/OUT
switch defeats the entire EQ section,
but
retains the
input buffer
and output amplifier so
that
no
gain
changes (other than
those
associated with
large amounts of equalization) occur.
In
the OUT position, the
OVERLOAD LAMP
will still operate as
if
full equalization were occurring.
Input/output polarity is constant regardless
of
the position
of
this switch.
The BAND EQ IN/OUT
switches defeat the equalization action of a
given
equalizer
band by disconnecting
the output
of the bandpass resonator from its
summing
amplifier.
Putting
unused bands in
the OUT
position will eliminate any
noise
contribution
from the
resonators and
will
assure accurate flat
response.
The EQ
controls
adjust
the maximum peak
or dip in each band over a
range
of
+!6dB, -infinity dB.
The TUNING
controls adjust the center frequency of each
of
the
four bands,
and
have
a typical calibration accuracy of +1/3 octave.
The BANDWIDTH
controls adjust the
"Q"
(sharpness) of each band.
The
"Q"
becomes broader when turned clockwise; sharper when
turned counterclockwise.
Calibration
tolerance is typically
+10%
of the nominal
"Q"
value.
The
FUSE
used in the 622
is a
3AG slo-blo
type:
1/8 amp for either I
1
5V
or
230V
operation. Replace with the same type only.
The INPUT
and
OUTPUT
connectors provided
allow
connection via
barrier
strip
(//5
screw).
2
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