F5 power amplifier

I bought an Antek AN-4218 for my F5 a while ago and after building and rebuilding my amp I finally got it how I want it. I just have one problem, the transformer developed a mechanical buzz. I can't feel the buzz in the transformer but I can hear it. I have the amp biased at .61 and temps are in acceptable range. There are no other problems with the amp and I am very happy with the sound. Is there anything I can do about this or do I just need to order another one? Is 400VA to small?
 
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how big is C bank ?

does it buzz if you put some soft rubber underneath and above it ?

IMG_9261.jpg
 
I have 6 X 33,00uf total in a clc configuration.

33kuF-33kuF-2mH inductor (don't remember eaxactly if that is value but it's close)-33kuF

I have rubber underneath the torroid and under the mounting plate. The buzz if faint but I can hear it because it resonates in the enclosure.

No dimable lights on this circuit but I could try connecting it to another outlet and see what happens.
 
i 've killed the f***in' ground loop

it took me quite a while to understand the internal ground loop
in my f5; but finally, (with a friends help) i got rid of it!
the signal wire is now led very very tight to the (dc-power/audioground) cabel tree from the plug 'til f5 boards.
no more hum no matter what source.
great amplifier!
thanks to nelson and you all