a
Transistors
Q108, Q109,
and
Q110
comprise
the
tone
control
amplifier.
The
output
(emitter
of
Q110)
is
fed
back
to
the
input
(base
of
Q108)
through
the
tone
contro!
network
and
is
summed
with
the
audio
from
stage
Q107.
As
shown
in
figure
3-5,
the
BASS
control
varies
the
frequency
at
which
the
low
boost
or
cut
begins.
The
slope
of
the
equalization
curve
is
relatively
constant.
The
TREBLE
control
varies
the
amount
of
high
boost
or
cut
rather
than
frequency.
The
output
of
Q110
is
applied
through
a
scratch
filter
to
the
external
power
amplifier
and
has
a
nominal
level
of
3
volts
rms
for
maximum
output.
3.2.6
Scratch
Filter.—When
the
front
SCRATCH
FILTER
switch
SWO6
is
on,
capacitor
C136
and
L101
form
a
low-pass
filter
directly
at
the
output.
This
network
attenuates
only
the
higher
frequencies,
at
about
8
kc.
When
SWO6
is
OFF,
the
series
inductor
(L101)
has
virtually
no
effect
on
the
output.
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