- Apr 24, 2022
- Reaction score
Hey guys, I have this 50w Ceriatone Plexi clone that I built that just had its OT replaced. The amp puts out a high pitched squeal when the presence knob is turned past about 5. Volume and treble does not affect the squeal, only the presence knob. The squeal is especially bad when I have the bright cap engaged. its a 4n7 BC. I have included comprehensive pictures of the inside of the amp, hope they can help resolve the issue. Thanks in advance!