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Testing JFETS to see if they are faulty or fake

Started by John S, February 26, 2017, 08:33:05 PM

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John S

How do I test jfets to see if they are faulty or fake. I tried using the greatly improved jfet matches circuit on Mark's page and they were getting really hot. Thanks
Schenkenstein custom effects. Check out the page on Facebook.

BrianS

This isn't exactly what you asked for but just info.

I mostly use SMD chips, solder them on Osh Park Jfet boards and solder legs on them.  It's a pain to do it but I don't have to worry to much about getting a fake.  If you purchase them from Smallbear, Mammoth or some place you know is reputable the likelihood of a fake is pretty slim.

These are what the Jfet board looks like:
http://www.diyguitarpedals.com.au/shop/index.php?main_page=product_info&cPath=1&products_id=286

I also use a Rullywow Jfet matcher board.  I have an extra one if you pm me your address I will send you one tomorrow, free of charge, if you're in the US. Here's a link to the matcher.

http://www.rullywow.com/jfet-matcher-project-vgsoff/