Cool, Here's the Link :Electronics Goldmine has MPF4393, packet of 5 for $5. That's where I got the ones in my Covert OD.
A chap at tagboardeffects built the Sabbath vero version & tried J201, 2N5457, 2n5484 & PN4393.
He said they all worked but the PN4393 had the least Background Noise which is what I found.
There are 5 in that Circuit.
I tried this myself but not getting any sound. Is the orientation the same as the mpf4393? How would I verify that?Some people recommend 2N5457
You can buy MPF4393 on ebay