Looking for a "Tube Guide"

An online resource is available at "http://www.svetlana.com/". Understanding that I am a beginner in tube audio, it is probably not up to par with the references listed by Longplate, but I found some of the basics offered there interesting.

There are numerous good books of a tubular nature available from Parts Connection division of Sonic Frontiers website.

Didn't VTL have tube book? Seems like I saw one in the Audio Advisor catalog. Good Luck, Doug