Passive tone control (passive) / treble control (active) for NOLL TCM

Additional Option for NOLL TCM- electronics with treble pot:

The treble pot is exchanged  for a double function pot, which works as
a tone control in passive mode and as a treble pot in active mode.

For NOLL electronics with tandem bass/treble potentiometer, there is only the option
of an additional tone control pot! ( see product "Passive tone control for Noll TCM" )