jfet preamp that decreases signal

Frequent questions about dead or faulty pedals. Whether you repair, mod or build pedals, debugging is important. Threads about general debugging problems irrespective of the circuit involved...

jfet preamp that decreases signal

Postby sevadi » 03 Jun 2010, 20:36

hello, i build a jfet based preamp and i found that on a transistor amp the signal gets about doubled but wen i plugged it into my jcm900 it was louder when i putted it on passive than when i used it! so i pluged my guitar in the effect loop on the back and there it was louder on the preamp again!

howe is this possible? (on the normal input it was less loud then the passive but i did lose quite a bit of hum from the long cabele and stuff.)
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