#1
Hey, I'm lookin for some advice. I have a peavey valveking 212, and whenever i try use my clean channel it lets out a high pitch squeal that gets louder quickly. My lead channel, however, works fine. any help would be appreciated, thanks.
#2
Bad preamp tube? Easiest way to find this out is to switch your preamp tubes around and see if the problem changes channels.
Hi, I'm Peter
#4
for sure a bad tube eh, i just had em checked out a week ago. thanks tho i'll try that.
#6
This may sound really rare and stupid, but I have a backlit keyboard that when the light's on and I'm playing guitar I get the high pitched squeal.

If you by any possible chance have a backlit keyboard then turn it off...