Yes, i know that conditions are different, i just want to eliminate the problems step by step.
Some time ago i owned Musical Fidelity Nu-Vista integrated amplifier with separate power supply. There were only transformers in that enclosure.
Anyway, adding 40000uF of capacitance after diodes unfortunately didn't make any difference.
when humming, use longer wires, and lift if from the case and see if hum goes away...and back if hum returns
have you rotated the toroid in place?
welcome to the Club (of these not applying simple methodology) - first thing is to check all components for function, before cry for help 
recently my SissySIT blow mains fuse in one channel - reason - Dodo diode in one (of four) metal case Graetz bridge
Why it gone Dodo - 35A, brand name, Iq in range of 1A8 ............ ?
Puzzle - just replaced all 4 .......
recently my SissySIT blow mains fuse in one channel - reason - Dodo diode in one (of four) metal case Graetz bridge
Why it gone Dodo - 35A, brand name, Iq in range of 1A8 ............ ?
Puzzle - just replaced all 4 .......
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