Mod:
**
Aside from using the on-board Dip Switch and Trimmer (some people prefer the set and forget method) you may use a DPDT
switch and potentiometer for mounting on the outside of the enclosure. Keep in mind that the potentiometer should be at roughly 2:00
for unity gain and higher for boost and clarity. It can also be used to cut the volume as well below 2:00 if needed.
Another Mod is to install a 2N5457 for a bit more grit when turning it up than a cleaner MPF102 will provide. As usual Bias from
4.5v to 6v. to suit your rig and ears. You will need to socket R4 and find the correct resistor.
If you wish to try a J201 (even more available grit) you will have to socket and adjust R1 and increase as well as possibly
socketing
R4
and adjusting till you can attain in roughly 4.5v to 6v. on the Drain leg of each transistor.
As always "socket and see" what you like. When using sockets this allows you to easily make changes without ruining the board by
desoldering etc...
DPDT and Potentiometer Mod with
