Leviathan GM100 - Photos and project notes for the Russian GM100 Tube.
List of Power Tubes - Handy list of transmitters, transceivers and amplifiers and listings for which tubes are used in their final stages for RF amplification and modulation.
The Vacuum Technology Page - Vacuum technology resources for students and more advanced users. Fundamental techniques to SPICE simulation. From Roy Schmaus at the Electrical and Computer Engineering Department of the University of Alberta.