Top side
Secondary HF
rectifiers and
reservoir caps
Mute and
fan control
DataPort
signal
processing
Output Zobel
filters
Input
buffers and
HP filters
To J410
on input
board
Clip limiting,
loop gain
feedback,
bias, current
splitter
Utility ±15V
supplies
Ch. 1
negative
step
circuit
Ch. 1 current
limit and
mute control
Ch. 2 current
limit and
mute control
Ch. 2
positive
step
circuit
Ch. 2
negative
step
switches
Ch. 1
positive
step
circuit
Power
supply
section
Inrush
thermistor
and relay
Power
supply
control
IGBT switches
and spike
filter
AC rectifier
and main
reservoir
EMI line
filter
“Keep-alive”
supply
Ch. 1 negative
driver and
output
Ch. 1 positive
driver and
output
Ch. 2 positive
driver and
output
Ch. 2 negative
driver and
output
±15V supply
To J5A
on input
board
4. Printed Circuit Boards
4.1 PL325 and PL340 Amplifier
Main module circuit board assembly
Circuit board neighborhoods
PL325 and PL340 main circuit board,
with major circuit sections shown
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