N_Cook wrote:

This is very light load of 9V , one FET, and 22K in line with "B+".
With old battery 4V over the circuit and it worked, tried on
DVM-bat_test and 0.02V registered, and about 6V on DVM-V.
I would have thought a SM 10uF cap downstream of that 22K would do the
job of switch-on bang, perhaps switch-off fart would be frowned-on, but
there is already a muting subcircuit there, so perhaps 3PDT switch instead.
Had another go at trying to find a user manual for a classic 2014, specs
yes, but no user manual to explain about that toggle switch, mute/boost
or normal/boost variants


Don't they have music stores in your country? They show you how to
operate that type of equipment, over here.