JVC A-X55 Service Manual

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
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New Super A IC
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D524
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Q518
Q522
R552
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Wave
Correction
Processor
Circuit
Fig.
2

JVC A-X55 Specifications

General

Brand	JVC
Model	A-X55
Category	Amplifier
Language	English