I tried to get a dc amp to work with stacked supplies. After many failures and cap coupling to listen to music I played around again, had a breakthrough and more failures.
I am a muppet when it comes to Spice and all things computers, I just used it to draw circuits.
I started with this combination of signal circuit and PSU which produced earsplitting noise:


I then disconnected the 530V supply, put in a floating external PSU and changed the signal part to this:

This hummed more than acceptable but I could listen to music and it sounded WAY better than the RC coupled version. So I went on and cleaned up the anode supply to this, sticking to the external supply for the 801:

With this I am back to earsplitting noise where I started. Do any of you have an idea what is going on here?
Thanks for any help,
Daniel