
-I just have a brief question about a Cornell Plexi 7 amp I picked up on Reverb used. It’s in superb condition, but something strange has been going on with it.
*For some strange reason, when at higher settings on the amp’s volume knob. If I adjust the volume on my guitar down from full up I get loud feedback-like squealing. If I set the guitar back to full up it stops, and I can avoid it if the change is only really slight.
Now, Just to be clear I HAVE totally ruled out the guitar, cables, and all tubes.. I should also mention that this amp has a power scaling feature and is much more problematic at lower output settings. I’ve never run into this before, I’d really like to hear your thoughts!
*Oh, btw when I opened the amp up to troubleshoot, I was pleasantly surprised to find the date stamped inside chassis revealed it’s only ONE month old!!