Below the Microcap Simulation Schematic
M3 and M4 are Hitachi 2SJ162 Mosfet
Bias current is around 100mA
V1 and V5 are High Voltage Supply, around 300Vdc
V3 and V4 are 50Vc for Power Stage
X4 is TL071 Op Amp used to fix to 0Vdc the ampli's voltage offset.
The Negative Feedback Network is present
X3 is a SRPP as Input Stage
X1-X2 are used as VAS and to drive the Power Mos Stage
I will try to sim with Ltspite. I dc offset circuit look good.
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