Normal channel missing just mV of output, same with footswitch supposed
operation, lead ch is fine.
Seems to be a rare beast, any pointers to a schematic ?
Uses 4x rc4558 opamps ,2x SJ3692 in PA, seems to use an opamp and FET
for gating on and off "normal" gain channel. Swapped out the 4558s, as
socketed, no change.
Thought found prob on underside , one pot pin had never been soldered,
just touching contact and some ring crack failures or dodgey looking at
pots, but that was just the general crackly performance, clean ch still
absent.
o/p of one opamp is high, same with swapped version, goes to gate of the
FET, which will be the next thing to investigate, if no schematic found.
When last powered I did not think to see if the footswitch action gated
the opamp o/p. Any other ideas?