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2-
Te
A-X55
No. 2589
(2) ''Dynamic Super A'' Circuit
Operation
Isolate Drive Circuit
This circuit is basically an FET source-follower circuit.
In A-X55, adequate dielectric strength is assured by the
cascode
connection
between
0501
2SK170
(BL, V)
and Q505.
Q503 is aconstant current circuit which determines the
current flowing in zener diode D509 RD2.7EB2 which
determines the cascode voltage of 0501
and Q505.
Q507 is aconstant current circuit which determines the
current flowing in Q501.
2. Wave Correction Processor Circuit
This circuit decreases
the non-linear distortion in the
power
stage.
It converts into a current the non-linear
distortion
voltage
detected
by
emitters
of
Q515
2SC2240
(GR, BL) and 0517 2SA970
(GR, BL). This
conversion current is applied across R509 (270) to the
input signal in anti-phase to deny the distortion.
Thus, the distortion is reduced by 20-40 dB.
. New Super A IC
The basic operation of this IC is the same as that of the
conventional
Super A IC. This new
Super A IC is a
monolithic IC exclusive for Dynamic Super A with fur-
ther improved current linearity and faster response.,
Isolate Drive Circuit
ITXX-374_ =
Q505
501
Q515
R728,.
27
sesititae
aL)
GD
New Super A IC
N
it — ke eG
C)h
]
as
POR BL)
saci ciees
"~
[-53.6]
eaaar
D525
O
R545.
AIO # O22
(3)
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