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#12933
Billy
Moderator

You can check the filtering caps and resistors around the bass pot C10, R11 and the bass pot itself it’s a passive tone control basically 3 low pass RC filters with C9, 10, 11 the pots for each band and R11

I’d imagine with your switch middle position being ‘off’ it may have some affect

Wilkie’s the man for this one it’s his baby !