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This is what the oscillation wave looked like in the BJr, thanks to the bad filter supply caps. Way up there beyond hearing at 100 kHz. Well used examples of the BJr from the 90's are showing up with weak filter caps. The Illinois caps they come stock with just aren't that hot. Replace with F&T caps (observe proper polarity), and make sure the big one gets doubled, while you are at it, to support the output transformer and any aftermarket speaker you might get in there. It'll firm up the bass!