This is a JFET version of one of the Benson amps, which is I think why the pedal doesn’t really have a proper name.

It’s hard to find a B2M pot for the bass control, but you can use a dual B1M pot and gang the two sides together to reach 2M.  Check the Pedal PCB ‘Son of Ben’ build docs to see how.   

Or you can change somme values and use a 1M pot instead, see this post for values.

Like any pedal using J201 FETs, make sure you get proper ones, or it just won’t work very well (I naively tried cheap J201 FETs once – it sounded awful).   

There’s a thread on Freestompboxes where Mr Benson jumps in with advice too.  Nice guy…   note: the schematic on freestompboxes has a 330pf cap listed instead of the 250pf cap on the Pedal PCB schematic.  The 250pf value was supplied by Benson.

BENSON PREAMP – POINT TO POINT LAYOUT