This is my take on a 2204 design. It had a low 60 HZ hum that got in the way if the amp was cranked when it had a star grounding scheme. When I put in the buss grounding I had a heck of a time trying to figure out how to draw it out so it would make some kind of sense. the BN designators mean "Buss Node". I made the high voltage connections nodal as well as the ground connections (on the drawing). No pics of the chassis. It ain't too pretty after 7 years of re-works. It does however work quite well. I'll probably build another one that's more perfect.
I'm still puzzled about how to design the "perfect" input circuit, since that seems to be so critical in terms of getting rid of the hum. I've got a Mesa Boogie in the shop. Maybe I'll take pictures and get a clue from that. Say what you will about Mesa's, but they don't seem to have any problems with hum.
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