Here's a sound sample I recorded. The drive on the Shaka is set at about 2 o'clock, the tone at high noon. I miced my 1972 Princeton Reverb with an SM57, reverb turned off, and flattened EQ. The tonal and gain variations in the sound clip are different pickup combinations and volume settings on my strat which has a Seymour Duncan JB humbucker in the bridge position.

I tried the mpf102 in place of the driver which resulted in a severe loss in gain. I've gone back to two 2n5484 FETs. I also played around with the clippers, I've currently got a MOSFET diode in one direction, and two silicon signal diodes (1n4148) end to end the opposite direction. This gives a bit more bite than two MOSFET diodes, and adds a nice uneven-order harmonic content.