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GlassWare Audio - An excellent site promoting the vacuum tube based amplifiers. Here you can find some basics of vacuum tube scheming theory, and a considerable list of old and very interesting books describing how to develop the Hi-End amplifiers.
basics of vacuum tubes - Good list of useful old books to deal with the designing of tube amplifiers.
Oldradio - This is the site to be visited first of all when searching for Data Sheets (in Russian) of "Made in USSR" vacuum tubes.
Audiomatica Sofia web page - This site contains useful data and samples of output characteristics of many popular electronic vacuum tubes.
Intusoft - Integrated simulator - I-SPICE. This site contains a description of an integrated simulator program I-SPICE, and lots of useful newsletters on SPICE modeling.
Duncan's Amp Pages - This is an excellent site containing lots of vacuum tube simulation models, tube Data Sheets, and links.
Norman L. Koren - This personal site contains the author's articles on SPICE vacuum tube simulation modeling and SPICE parameters defining.
ALL SPICE Stuff - This site contains all information about SPICE.
MICRO-CAP - A trial version of this program is available free for download.
Vacuum Tube Device Approximations - I recommend becomes familiar with by this work. Very interesting articles.
Vacuum Tube Brasil™ - brasilian tube audio & tube ham radio webpage.
Esoteric Audio Teac - Synergistic Research Acoustic Systems, synergistic research cabels, YG Acoustics and more at Scott Walker Audio.