Jam, thanks for your replies.
R10 and R31 will be pots. This is only a prototype design, and rails was chosen because I had that PSU on hand. Resistors from the drains of M1 and M2 is still an option, but with two feedback loops I got better figures of THD in simulations for VAS stage. And I wanted to follow close to JC’s design and his remarks. The same about servo DC. I think, decreasing resistance of R8 and R14 could be require a next stage (e.g. source follower) – the resistance of the VAS output is very high.
Next step would be splitting the rails and lowering rails for the output stage, to run this amp in fully class A.
Regards
R10 and R31 will be pots. This is only a prototype design, and rails was chosen because I had that PSU on hand. Resistors from the drains of M1 and M2 is still an option, but with two feedback loops I got better figures of THD in simulations for VAS stage. And I wanted to follow close to JC’s design and his remarks. The same about servo DC. I think, decreasing resistance of R8 and R14 could be require a next stage (e.g. source follower) – the resistance of the VAS output is very high.
Next step would be splitting the rails and lowering rails for the output stage, to run this amp in fully class A.
Regards
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