Rush Pep Box Schematic?…

[Coda]

Does anyone have a schematic for the Pep Box. The only one I have found is from the British Pedal Company reissue, and, from what I have seen, it was shit. I’ve seen pics of the insides, and it looks simple enough. The newest reissue sounds pretty great.

 

[Feral Feline]

From Effects Layouts (not sure where Storyboardest got it):

From Revolution Deux:

 

[Mcknib]

This looks accurate if you compare it to gutshots of the original and the reissue his daughter made same as the revolution deux GE one @Feral Feline posted above

 

[Coda]

Looks like I’ll go with the Revolution Deux ones. Thanks all.

 

[HamishR]

Just found this thread via google! I found the storyboardist schematic for the silicon version which is actually the Basic Audio version which added the Body knob, as the original is rather thin and bright. I built the original a few years ago and thought it was ok but not amazing so this time I built the Basic Audio version which is better, but perhaps mine doesn't sound quite as good as it should because I didn't have BC107Bs. I used 2N3904s and they gate slightly.

Actually the gating is pretty cool and useful because most of my guitars feedback easily. But I might need to either try different transistors or add a cap across the base and collector of one of the transistors to get rid of some squealing oscillation. I wonder which tranny I should add the cap to?

 

[Coda]

Just found this thread via google! I found the storyboardist schematic for the silicon version which is actually the Basic Audio version which added the Body knob, as the original is rather thin and bright. I built the original a few years ago and thought it was ok but not amazing so this time I built the Basic Audio version which is better, but perhaps mine doesn't sound quite as good as it should because I didn't have BC107Bs. I used 2N3904s and they gate slightly.

Actually the gating is pretty cool and useful because most of my guitars feedback easily. But I might need to either try different transistors or add a cap across the base and collector of one of the transistors to get rid of some squealing oscillation. I wonder which tranny I should add the cap to?

I would try Q2…since that’s what works on a Fuzz Face.

 

[HamishR]

Yup - tried and it works! Used a 47pF and it does the job with no tone loss. Thanks!

 

[HamishR]

BTW this is the layout I drew for it, just in case anyone wants to try a vero version:

 

[Coda]

I breadboarded the Si version this morning. I went with the Revolution Deux Si schematic, and used a 100k trimmer. Long story short: its pretty decent. Similar to an FY-2, to my ear...maybe with a tad more character. Interestingly, the first one I breadboarded died. Looks like I fried Q2 somehow. Anybody know off of the top of their head how that could have happened? Meanwhile, I'm going to start over. I don't think I have any 107's left, though...