I take it back, if that is what you are hearing and where you are hearing it, it is those green ceramic caps. Ceramic caps have a tendency to be piezo electric and your probably hearing the effects of that.
If those filter caps where the source of this noise, it would most probably be audible in the output of the amp as well
If those filter caps where the source of this noise, it would most probably be audible in the output of the amp as well
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