View source for How to adjust gain in FET based circuits

'''[http://www.geofex.com/ R.G.]''' 

:To change JFET stage's gain, change the unbypassed source resistance.*  ... You can change gain easily by inserting unbypassed source resistance, and probably should do it that way instead of swapping JFETs at random. The J201 is a high gain device, so it's easy to turn the gain down.



'''[http://www.runoffgroove.com/ B Tremblay]'''

:Our basic rule of thumb has been that if a bit less gain is needed, swap out the J201 for an MPF102 or 2N5457.  A side effect is that the overall tone will become brighter.

:However, those three types were usually only ones we'd try while developing FET-based amp emulators.

:We didn't choose those types according to datasheet specs; they're simply three of the more common FETs in the realm of DIY-fx.  It's not very scientific to be "easter-egging,"  but doing so would sometimes produce pleasing results.


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Text taken from [http://www.diystompboxes.com/smfforum/index.php?topic=28810 this thread].

<nowiki>*</nowiki> '' paraphrased''