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Fixed! The resistor on C4 seems to have done the trick. Thanks very much for the advice.

Unfortunately didn't resolve the issue, anyone with more experience chime in but my thinking is that since I get pop when first clicking on but then nothing if I play it for a bit and click off and on, it's likely to be a leaking cap..... When off/not being played it seems like the pop builds up.

If this make sense does anyone know a way to check for this type of issue. Don't really want to replace all the non-elec caps but I'm obsessing so that'll likely be my next step.

Thanks again for the suggestions pryde

Hey thanks very much will give it a go today.

Hi all, appreciate your help on this one, built a Jules Cavern from rullywow which is a great sounding little delay, the only drawback is that I'm getting a pretty big pop when first engaging the pedal. With a few clicks on and off it goes away but I'd like to eliminate it if possible. The board does have a pull down resistor so don't think that's the issue. I've read about leaking capacitors causing pop so I've even replaced all the electrolytics with no success.

Any help greatly appreciated.

Inspiring, quality work!

That did it thanks again

Used a 20k trimmer, upped the R4 to 1k to increase volume (as per another post). R3 is 24k; came with the PNP's, indicated as the correct R3 for those transistors which now seems a bit extreme considering it should be 220R. I'll swap it for a 220 and see if that clears it up.

Thanks for the help

Hi all, built the PNP Mangler, it works (after a few fixes) but when trying to bias my voltage reading on the pad is btwn -.23 and -.14 can't get it to -4.5, any help appreciated.