Klone oscillation (not the charge pump kind)

[AntKnee]

At full gain, using neck pick up, my klone build is going into oscillation on some notes. Sounds fine on lower gain settings. This is not a setting I regularly use, but I still want to eliminate the problem.

Any thoughts?

[EBK]

A long time ago, I read about some potential stability issues in the Klon design that can sometimes show up at higher gain settings.  It has to do with some component value mismatch/tolerance issue or something more intelligent sounding  , but I can't quite remember which parts cause the problem.... 

Best solution is to never turn the gain higher than 2 o'clock.  That's the end of the useful range for that control in my opinion.  YMMV.

[AntKnee]

I figured it was a perfect storm of mismatched tolerances or something like that.
It's not a big deal. I don't play at that setting, but I just stumbled across it and wondered what caused it.

[EBK]

What sort of op amp are you using?

[AntKnee]

What sort of op amp are you using?

TL072
7660SCPA
Using all usual component values, no substitutions.