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Hi xefned, tanks for your reply ! …I have never find out the cause of the squealing, I have a large stock of NOS J201 (from reliable sources), tested a few sets and finally gave up.

I use the same system for testing all my circuits, in this case, Corduroy has all grounds connecterd via a ground plane, so it should work like many other fuzz/distortions/etc I have build...The fact that this squealing is only in the big mode tells me that the problem must be in that part of...

To get 4.5V drain voltage, trimpots are between 12.5k and 13K.

maybe I should ask this : does anybody get squealing/oscillation with fuzz maxed, and volume past half in the big mode?

I use common ground to test before boxing...

Yes, they come from smallbear and other reliable sources (I have 150+ of them).

It's the first version of the Corduroy PCB, when I build it I couldn't get Q3 drain voltage right, then I saw that there's a newer version of the Corduroy with the trim pots, and reading the new schematic I realized that the first version didn't have the 1M resistor from Q2 gate to ground, so I...

...by the way, the squealing only happens in the "big" mode with the fuzz all the way up and volume a little more than half way up... Any suggestions will be appreciated.

Hello ! I have build the Corduroy fuzz, it sounds pretty good but I'm having a hard time dealing with the trim pots, I'm getting a high pitch squealing if I set the trimpots to 4.5V drain voltage...Squeals goes away at aproximately 6V- 6.5V. I have tons of J201s and I already tried replacing...