[font=trebuchet ms]The Tube Amp Book has some interesting pictures and stuff in it about who made what, but it gets wedged in amongst page after page of Assburn Pittman raving about his Groove Tubes. Lame - very lame.

The How To book is better for learning how to maintain your amp.

And your amp deserves better than that re-labeled Groove Tubes crap. Talk to Bob at Eurotubes about what you have, and what you want it to do. He sells JJ tubes, which for my money (and I've bought a lot of tubes), is the only company selling new-production tubes that give you excellent quality and predictable results. The advantage of buying through Eurotubes is that you get the benefit of Bob's advice about what tubes to buy, and how to set 'em up. Well worthwhile.[/font]