Page 1 of 1

Feedback issue

Posted: Sat Dec 10, 2011 6:42 pm
by mask_music
Alright my first jtm-45 is done. I have runn into a problem. When I crank up the gain on channel one it does not feedback but it oscilates. It only happens on channel one as channel two has no issues. If I just plug a jumper between channel on and two it oscilates as well. Just random high pitched oscilating, no motorboating of any kind. I also I have a plexi50 that does this with everything cranked to 10.

Re: Feedback issue

Posted: Sat Dec 10, 2011 11:01 pm
by OnTheFritz
Do you have the 5.6K resistors on the power tubes?

Re: Feedback issue

Posted: Sat Dec 10, 2011 11:19 pm
by axeman
Are the wires on the input jack long, also keep wires from the pots away from the input wires.