I tried ground loop breakers also, with no effect. That's why I'm started to think that maybe this is not a grounding problem? Well, I will try adding another R to my psu. If it doesn't work, I will build F6 or something. It seems I have 6 matched IRFP240 pairs left over and 6 more from Aleph 5.
If you connect your source as battery powered floating source - like your phone or other portable device. Is there still hum? If so then might be mains trafo electro-magnetic field modulating your front end or VAS stage. Noise pickup basically.
I had this problem with M2 amp. Moving trafo outside case fixed it. Not an option though practically.
I had this problem with M2 amp. Moving trafo outside case fixed it. Not an option though practically.
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