[HAM] B3 question:

[Ferpini]

Try manipulating the "tone control" pot on chassis of the AO-28 
pre-amplifier (from the back of the organ).  Its a cheap place to start. 
The other pot controls the percussion decay time, and you might like a 
little slower decay if your percussion is weak.  Tubes and a pre-amp rebuild 
should precede any thoughts about recapping the TWG.

Regards,

Dave Bishop