Nostalgia-Air
Large site!, vintage radio references, schematics, tube data, and much more!

World-Power-Systems Archives
Numerous scans of valve-data books, from 1958 to 1961, Nixies, and more.

N0VYK's Antique & Amateur Radio
Amateur Radio call-sign searches, valve-data scans, (Reference materials), etc.

VK3NDS Amateur Radio Site
Many topics of interest, including links to FTP sites for radio-related programs etc.

Tube World
(USA). Need to buy something, or find out its typically worth, (U.S. Dollars), look here.

Halfin S.A. (ETOLS)
Detailed data on valves etc., after signing up for a free log-in/password.

Roy Schmaus Site
Links to many sites under 'Vacuum Tubes', and a 'Valve Technology Page', etc.

SkyWaves. (Harry Connix)
Broad spectrum of interesting related vintage equipment history etc.

Mikes Electric Stuff
Numerous photos & data on his vast collection of 'Antique Glass Stuff', & Tesla-Coils.

Valve Radio Repair & Restoration
A comprehensive source of good & detailed instructions/tips, data, & CD offers.

(More of these later...)