Got a little simple boost/preamp for your Thursday. Should be a pretty easy fit in a 1590A. J113 alternatives would be J201, 2N5457, and probably a couple other JFETs that are obsolete. 😑
Built it, definitely works and gives plenty of volume boost, however with 2N5458s, it did sound pretty muddy like Marcus Corradini said. Did not sound actually muddy the way a fuzz does, but sounded like the transistor was pretty misbiased. Swapped out for a J201 and sounds way better with more clarity.
I get this soluction to 2n5457: I put a 10k resistor between the source and 47uF capacitor, and change the drain resistor from 22k to 100k. Maybe It help you
Verified! I used J113. The tone is a little muddy...
ReplyDeleteVerified! With J201 sounds very good
ReplyDeleteIt can work in bass?
ReplyDeleteIt should. You may want to up the value of the 47nf cap though.
DeleteBuilt it, definitely works and gives plenty of volume boost, however with 2N5458s, it did sound pretty muddy like Marcus Corradini said. Did not sound actually muddy the way a fuzz does, but sounded like the transistor was pretty misbiased. Swapped out for a J201 and sounds way better with more clarity.
ReplyDeleteI get this soluction to 2n5457: I put a 10k resistor between the source and 47uF capacitor, and change the drain resistor from 22k to 100k. Maybe It help you
Delete