J111 is popular, just punch it into google. It looks like you are in UK, I just saw a place called Amp Doctor that has them. You can always do a cross reference check in google to…there’s something that all the electronics companies put out called a semi conductor cross reference book so you can get it at your local electronics parts house.

If all else fails just walk in and tell them you need a FET J111, TO92 case style…just make sure the legs of the FET are the same, by that I mean the Gate, Drain, Collector have the same orientation as the old one.

With that said the FET may or may not be your problem, I would check voltages first with one in the circuit that you know is working. And there is nothing to pop in, it has to be soldered. Some people cut the legs and tack the new one in and some pull the board and desolder correctly and replace…

Gary

Where can you get the J111 FET – Looking at all the info on it (and there is not a lot) it seems to be a bit of an odd fish – Peavey only list it as 35v Special Application – other specs are

J111 (TEM) N-FET-J 35V IDss> 20mA Rds30R TO-226AA (TO-92)

Is there a modern easy to get FET that one can pop in or is this something that needs to be ordered from Peavey

Thanks

Paul

I would read the above article if you havent, check the easy stuff, if it’s not the easy stuff, probably a bad FET.

Gary

Thanks for the kind words. If anyone is interested here is a link to the book, a guy at Groove Tubes turned me on to it:
http://www.aztechmusic.com/resources/

Excellent book,

Gary

Thanks for suggesting the “The Guitar Amp Handbook” (Understanding Tube Amplifiers and Getting Great Sounds)!!! Fantastic resource. I love your site because it is good for the layman like me or for people who need to expert help. Your tutorials are excellent and to the point. Great site!

Keith Guitar Stanton
Orlando, FL