Voodoo Lab - Superfuzz

[Bernardduur]

His has an NP 1u cap on the output (2u2 in mine) that looks like someone fixed a faulty unit (different soldering)

The 3n3 in his (22n in mine) is all original (same sort of cap / soldering)

The orientation of Q2 puzzles me. The emitter of the 2N2907 is connected to ground....... different from everything I've seen of an Bosstone........

[EBRAddict]

I agree that PNP in the schematic is backwards compared to every other schematic. I have seen one schematic using an NPN in that position with emitter to ground, but it looks like someone's modded DIY.

I traced an original MSA steel guitar fuzz from photos (MSA owned or shared an ownership with Jordan after the development of the Bosstone) and it too had the PNP in collector ground orientation.

[Bernardduur]

I don't know; it puzzles me. In both units there is a (National Semiconductor) 2N2907 transistor and in both units the emitter is connected to ground.

Well, I think it is the emitter. In both units the 2N2907 is a metal can transistor with a tab; on all the datasheets this tab is located at the emitter side. Of the National Semiconductor version I cannot find a datasheet........ but it would be weird that this version is different compared to all the other versions......

[EBRAddict]

There's a pic linked on TGP which also shows the Superfuzz Q2 collector going to the clipping diodes as your schematic indicates. Does the 2N2907 have any kind of reverse beta? In the standard Boss Tone collector ground PNP configuration it does provide some gain to the signal. I'm going to try this on a breadboard.

[Bernardduur]

I modded my friends version by putting a 150p cap parallel to C15; he wanted some more bottom end and this works just perfectly. The resonance knob still functions and gives a lot of brightness and highs when fully turned counter clockwise; clockwise it adds a lot of bottom to the sound (maybe even too much). Just as he wanted