Terrible High-Pitched Squeal On Katana Mk II 50
Hi everyone, I am trying to get to the bottom of this awful noise my amp has been making ever since I got it. I bought a Katana Mk II 50 (I think it's the gen 3) and when I plug it in to my guitar it does this high-pitched squeal that drives me crazy. It even does it on the clean channel if I turn it up past about mid volume and master on 0.5 watts. It does this with all my guitars and cables.
I have tried just about everything I can think of to try and fix this. I know it's not my guitar and cable because they both sound good on other amps at high gain. I have turned on noise suppression in the tone studio and while it does help a little, it still makes the screeching noise. (I have noise suppression on in the video) It's loud enough to make me not want to even use this amp. The noise stops when I mute the strings if that is helpful. I have even tried moving around to different outlets in my house and have used the amp in other places and it doesn't make a difference.
As a side note, my sister also recently got one of these amps and hers is making the same noise too.
If anyone has any advice or ideas on what's wrong, I would greatly appreciate it!! Thanks in advance.