Hey guys. Is there anything I need to keep a particular eye out for when looking for one? I found one in a local shop, and it looks like it is in good shape (plus, it has one of those diamond 4x12s ... but it only had 3 speakers). Four power tubes, 6L6s that looked pretty new. Took one out to look at the number, and they seemed very clean. Tolex was in good shape, the knobs were smooth. I just didn't have a chance to play through it, though I plan on taking The Plow (modded MIM fretless jazz with MM humbucker in the neck) in next week with my Avatar 2x10 (not an ideal cabinet, I'm sure, but it's what I have to work with for now) to try it out with all of my stuff. Guy said $400, and if I can talk him down at all, I will. I think it will be a trade, so we'll see. I guess the two questions are - is there anything in particular I should keep my eye out for? And - I know 6L6s, EL34s and 5881s are more or less interchangeable, and that 6550s and KT88s are more or less interchangeable. Is there a mod that one could do to make a 6L6 amp take 6550s for the extra power? Thanks guys.