/diy/ - Do It Yourself

I´m trying to troubleshoot pic attached (amplifier stage for eletrostatic headphone) and running out of ideas.
I expect a full voltage swing on O+, O- of about 640V RMS with as low as 4V on I+, I- but my output saturates at about 40V and if I connect a headphone I hear sound but distorted and crackling when input is not present.

I suspect a failure through a earth issue which had the circuit loose ground reference for a few secs and prob fried some components.

My power rails on input are fine. I noticed that Q10 and Q9 are sending gate voltage straight to drain. I think that´s what I might be measuring.

Fml, that was so much work. Anyone else with an idea? I don´t want to measure and or calculate every value and voltage.