Thanks Ari! I should try to clarify though- it's not a separate PSU for the gain, just a separate filter stage. If you take two of the original Mapletree PSUs after the first filter cap, and put one of them on each of the output legs of Ciuffoli's PSU, it's pretty close to what I have. I did not use a Graetz bridge this time as Ciuffoli does, just a normal FW setup with an 80 rectifier. My other amp does have the Graetz bridge, using two hexfreds and a 12X4 rectifier.
Ciuffoli's PSU:
[ATTACH=CONFIG]3094[/ATTACH]
The separate chokes on each channel do seem to work quite well. My output stage would be tagged on at the terminus of the above schematic, then there is another r/c filter composed of the poly in oil caps on each channel before tagging on the input stage. It's very quiet, but is still very fast, without excessive overshoot or ringing on transients. The output is pretty heavily biased, too.
Nate- a 1.25d knob will fit okay, it's just that I didn't like the knob I had on hand in that size- it was too short for good vertical use I think. The Kilo is a good height, but a little too skinny, not to mention odd looking. The fluted bakelite communications knob that Lloyd uses on his amps looks very good on it, but feels weird when used vertically.
I think an ideal size would be about 1.125d x .65 tall, or something along that line.