?problem with WH Purple Platypus

Posted by Kalimna on Feb 27, 2018; 3:07pm
URL: http://guitar-fx-layouts.238.s1.nabble.com/problem-with-WH-Purple-Platypus-tp41935.html

Greetings folks,
I have a question regarding my build of the Way Huge Purple Platypus, layout from this here site :
http://tagboardeffects.blogspot.co.uk/2017/04/way-huge-purple-platypus.html

In a nutshell, it works but I think something is amiss. I get a very fuzzy signal coming out that is only subtley affected by the controls. After the pedal has been switched on for a short time, there seems to be a sortof noise-gated effect whereby the guitar signal is extremely quiet if played gently and then back to full volume if played harder. But this full volume decays very quickly. It is hard to describe, sorry!

This happens with any combo of NPN/PNP transistors I have tried.

I wonder if you might be able to suggest where I might start troubleshooting? I'll measure some voltages tonight when I'm at home, though I have tried a couple of different CD4049UBE's with no change.
I did wonder if either one of the capacitors might be faulty (all the electrolytics are from a cheap bundle-pack) or the transistors biased poorly through incorrect resistor selection.

Any thoughts?

Cheers,
Adam

P.S. Otherwise my recent additions seem to be doing the job nicely - MB GravityWave (glorious), correctly re-wired the leads to pots on Timmy w/LM833 (again, glorious) and a Marshall Bluesbreaker (why haven't I built this before???)