• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Suggestions on books

"Any good ones from AES?"

Yep:

Valve Amplifiers - Morgan Jones
Building Valve Amplifiers - " "
Principles of Electron Tubes - Reich
Fundamentals of Radio Valve Technique - Deketh
Understanding HiFi Circuits - N. Crowhurst
Mullard Tube Circuits
Basic Theory and Application of Electron Tubes - Army, Air Force
Inside The Vacuum Tube - J. Rider
RDH4

and free:
http://www.audioxpress.com/resource/audioclass/index.htm