My 2011 H is making a strange noise. I'm not an expert so forgive me if I don't describe it correctly. If I tap on the top of the cabinet I hear rattling and it's also audible through the speaker. It's not the reverb. Could a tube be loose? I've also been hearing a pinging sound when say hitting an open chord. I say ping because it's a high pitch over tone. I don't think it's my guitar as I don't hear it through other sources.
Thanks for any suggestions. If that's too vague I'll try to describe it more.