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Then run a voltage check - locate J105...


The F E D silkscreen and there is a 10kHz line right there by G for board ground (large foil versus 8V runner foil to the front panel side) - see if it changes...


Sorry, when I talk Clarifier Fine coarse - just get used to looking for a voltage on this header...it's part of the bandswitch and the 10kC jump


Which may mean you have a diode array or 4008 Adder chip going bad.