Marshall AS100D, of 2008
if the mixed 1 and 2 signal fails to get to the output amps then there is a
second route via the effects board, but that route is fixed , ie no header
connectors , switches or pot wipers, leaving dodgy pbf.
I cannot see how failing switches for the anti-feedback notch filters could
pulldown the ch1+ch2 mixer opamp.
Probably resolder all in that area
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