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SONY
STR-VX
Series
Circuit
Operation
STK-463 for the STR-VX2)
have high
open-loop gain, when negative feedback
is applied,
noise
and
distortion
will be
reduced.
Figure 3 shows the left
channel
main tone amplifier circuit of
the STR-VX1.
The
simplified version
of this circuit is shown
in
Figure 4.
The negative
feedback
loop between
pins
6, 7, and
2 is divided
into two
parts.
The DC negative
feedback is
determined
by R609,
R608,
and
C605.
AC negative
feedback
is determined
POWER
AMP
BOARD
s6-I
C606
22/16V
Fig.
3.
by all peripheral
components.
By
changing the amount
of AC
negative
feedback
with the variable resistors
(RV604,
RV605),
we
obtain
the
de-
sired tone
control response.
C613
and R616
compensate
for flatness
at
low frequencies.
C606 is connected
to prevent
the tone
control elements
from affecting the DC negative
feed-
back.
C604,
C609,
R607,
R613,
C607,
C608,
R611 and R606
are the periph-
eral elements
to make
the circuit stable.
R6I7
Fig. 4.
Simplified Circuit of Fig. 3.
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