I've built 5 amps, but want to learn more. Problem is, there are no good sources! I was at Borders, but there were no specific books regarding tube amplifier circuits. If I took an Egnater or Kendrick build your own amp class, I wouldn't learn much more than I already know. I have a bunch of books (Weber, Bacon, Aspen Pittman) but they don't teach how to interpret and design circuits. I checked and their is nothing amplifier specific or even close at the local colleges. Any ideas? Books that would help? A way to learn the circuitry better? I'm supposed to be talking with a friend's landlord who is an old TV and Radio repairman. He's too old to do repairs anymore - if he was still active I'd apprentice for free. Maybe he'll take me under his wing and work with me regardless.