Currently Being ModeratedAug 27, 2012 3:58 AM (in response to evilmikehoo)Re: What's the difference?
Regarding the knobs, my guess is that a previous owner replaced the for cosmetical reasons. Never seen 'em that way.
My master pot was the same on my 212 mkI, and I had it replaced. Line6 put a lot of crackling master pots in their mkI's, and replacing it with a proper one does the trick.
Try playing with a little bit more volume to assert if your amp is too muddy or not. Tube fabrication dates/months are usually printed on the tubes. Mine still sounded great after 4 years.