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Put that project in a proper chassis/enclosure....

as have been saying and see what happens. Process of elimination is what you need to do. I hope you are writing everything down you have done to cure this issue so you won't be chasing your tail after awhile. It can get confusing and hard to remember everything. The data will help steer you in the correct direction as to what is working and not.

Make sure to use shielded interconnects and internal input wiring. Also did you ever check your AC line for DC on them? That will have to do more with a physical buzz but it's still annoying. I recently put my VTA-120 on a AVA "Humdinger" and that eliminated the buzz I was starting to get on the Variac and Power transformer of the amp. I have 0.6vdc riding on the mains so the humdinger (I need to make my own now) took care of it.

hang in there!

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