I just got a used JCM 2000 DSL100H. Btw. the logo came off a long time ago but I've ordered one already. There are some snarkling sounds that I thought were from the amp but I've tried other guitars and it's only my main guitar. Here's a clip of those sounds. Does anyone here have an idea what the problem is and how I can fix it? I was thinking about starting with a contact spray.