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SONY
STR-VX
Series
Circuit
operation
STR-VX4,
-VX5,
-VX6
Tone
a constant-current
load for Q605.
The
A
lifi
bass
and the treble
controls
are con-
|
mpiirer
nected in the negative
feedback
loop.
(
.
;
The
STR-VX4,
-VX5
and -VX6
also
Four discrete transistors are employed
have subsonic filter circuitry.
The
in the tone amplifier
(Figure 7).
Q603
operation of the circuit is identical to
and Q604 are connected
in a differen-
that of the STR-VX3.
The
STR-VX6,
tial configuration
to eliminate
the com-
which is the top model of the
STR-VX
mon-mode
noise coming from B+/B- line.
series, features pre-out/main-in ter-
Q605
further
amplifies the voltage
sig-
minals
for expanded
utility.
nal coming
from
Q603.
Q606
acts
as
LOUDNESS
SUBSONIC
$602-1
$604-1
=
A
Q605
1) 2SA1026
Q603
Q604
2sc240l
2802401
RV6OI
250K
BALANCE
2scisis
R637
150
Fig.
7.
STR-VX6
Tone Amplifier (Left Channel).
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