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Where did you get your chips from? they have no logos. there are a lot of bogus chips out there and their behavior can be very hard to predict.

Thanks for the clarification.

Well I can't seem to delete this thread but I got my answer: I opened up my Thermionic and it behaves the same way.

So it was my understanding from reading the build copy that the trimmer inside the Brown Betty shifts between the Thermionic and Dirty Sanchez circuits. After building it, it seems more like the trimmers inside those pedals, controlling overall gain. I thought I had maybe made a mistake with the...

well it turns out there is a ground issue, not an issue with the Jfets... doh

I'll do that and post pics etc soon. From what I read it should have worked fine crossing one of the legs over, so I was pretty disappointed. I guess it's also possible one of the legs is shorting out, even though I slipped heat shrink over them. I appreciate your help.

Thanks for that. I tried substituting a 2n4393 from Tayda, was mindful of the pinout but still I get no sound on my DLS MK3 / covert OD build. Think I'll try this instead

Is the pin orientation the same?