In the words of the maker Brian Wampler, this was designed to sound “sort of like a cross between a “Marshall 18®” and a “JTM45®”, and those who have purchased the Plexi-Drive agree that it’s very accurate! The bass boost toggle switch adds fat, full bottom end which is very useful in lower gain or lower volume (bedroom practicing) applications. For band volumes, cutting the bass out a bit really helps the tone cut through perfectly.“
Some people experienced popping which can be due to the input being connected directly to the first JFET gate. This is a modified version which adds an input capacitor and anti-popping resistor.
Geiri’s demos of his dual build with Les Paul and Strat: