i just got a brand ass new 6505 today with a marshall 1960a cab. i started playing with it without anything in front of the amp and the distortion is kinda fuzzy. but i also only had it on 1. i was wondering if this is how it is for everyone. also the bright switch doesnt really make an audible difference and the presence knob is the same way until it hits 9. could there be a tube fucked up? Im planning on getting new tubes for it anyway so what kind should i look into and what would they do to my sound?