I'm looking to buy my first tube amp and at this point I've narrowed it down to a used Peavey VB-2 or a used Musicman HD-130, though I'm more than willing to consider other options that may suit my needs better. The kicked is that it has to be less than $600, because cash is short. Right now I'm playing through an Acoustic B600 and a 4x10 cab. The B600 does perfectly fine volume wise for where I play right now but I'd like a bit more of that fabled tube warmth. I switch fairly evenly between an old-school thumpy sound to a more grindy low-mid oriented sound to a deep purr and I'd like an amp that can accomplish those three well. I'm probably going to stick to the single 4x10 cab or possibly a 2x12 in the future What I'm looking for: Enough headroom to stay clean at loud volumes, "tube sound", an XLR out for PA purposes, capability for the aforementioned sounds, and a pretty good amount of tweakability, cost <$600. What I don't care about: Weight, aesthetics, physical size, whether or not it's a pure tube amp or hybrid. What I DON'T want: High gain amps (again, I need a relatively clean sound), low volume. I'm willing to scour the 'bay for used amps since I know I won't get the things I need for less than $600 new, and I can dig on vintage stuff too. But if you think there's an amp that'll do what I need that I didn't mention, please let me know. Thanks in advance!