Info about the discontinued original:
Bassists need dirt too! But no one, until now, has given you something that works, with all the full, rich bottom-end that you deserve, damn-it! BTW, many guitarists use and prefer the Bassdrive for Guitar!
The Bass-Drive is a lot like its cousin the Full-Drive2, but voiced with an extra octave of bass coverage... still giving a natural, uncolored FATNESS to your thang.
From just adding a little grind, to replicating a raging SVT, to sounding like Jack Bruce in Cream. (He's got one already!)
THIS WILL DO IT!
Here is another version seen in one schematic and confirmed by John K based on values noted in ones he repaired. This one based on symmetrical clipping with the mosfets using 2 x 1N4001 in that section. If you prefer to use the asymmetrical mosfet clipping with a germanium diode shown in the first layout, then just use the V1 layout as a base and change the capacitors to the alternative values mentioned in John's post:
1) 100n input coupling cap is 22n
2) 10p input cap to ground is 51p
3) 51p cap between pins 1 and 2 is 100p
4) 220n at pin 2 is 330n
5) 220n at pin 5 is 68n