Mine is currently defeated with jumpers between terminals 11,12 bad 13 and 4,5 and 6 and 3 and 10 from the treble pots lifted from the board.
Wouldn't running one jumper from terminals 6 and 7 as well as 13 and 14 and opening the circuit on term. 3 and 10 to the treble pots defeat the tone controls? Or would the 2 .0075 caps still affect the circuit?
I could use 2 switches (2pole) if that's the case.
But I am probably missing something.
If that won't work I'll try dip switches.