200W bass amp noise help

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Ferrous metals may also conduct/direct fields where you don't want them, and transformer buzz can mechanically couple into a chassis and be picked up by microphonic tubes, i e. most of them.
Good transformers may be potted in a steel case, maybe with tar on the bottom, dry sand filled, the more tar on top, finished with a steel cover and ceramic feed thru conductors.
 

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