TUBE SUPPLIERS:
Amplified Parts
Antique Electronic Supply
D & C Electronics  Spring Hill, FL
Electro Sonic, Inc.  Tubes and components

International Components Corp. - Excellent pricing.
1-800-645-9154 will bring tube, and components catalogs. (US & Canada Only)

R.F. Parts Company  Another good source for tubes
Radio Electric Supply  Good selection of tubes at reasonable prices
Richardson Electronics  La Fox, IL
SND Tube Sales  Tubes and tube testers
Solen Electronique Inc.  St-Hubert, QC
The Tube Store  Tubes, tube sockets and more, guitar amps, high end home audio.
Tube Data
Tube Depot  tubes, guitar amps and more
TUBES.RU  Amateur tubes, and more - Russian source
Vacuum Tubes, Inc.  Tubes, parts & books - Orlando, FL

TUBE MANUFACTURERS:
ECONCO  Woodland, CA
Eimac  San Carlos, CA
Electro-Harmonix  largest remaining vacuum factory in the world
Penta Laboratories  Chatsworth, CA
Photonis  Lancaster, PA
Svetlana  St. Petersburg, Russia
Teledyne e2v Ltd.  Chelmsford, Essex, U.K.
Thales Electron Devices  Cedex, France