ATSI Advantage Tube Services 
Offers various vacuum and electron tubes for audiophile and hobbyist.
http://vacuumtubeaudio.com/Audiolamp
Sells tube and their parts. Provides technical information.
http://www.audiolamp.com/
Audiotubes
Brent Jessee recording tube sales and information. Provides data and articles.
http://www.audiotubes.com
Electron Tubes
Supply electron tubes and valves.
http://www.halfin.com/shop
Electronic Valve and Tube Company
Australian supplier of NOS and current production valves, tubes, transformers, capacitors, tube books and associated parts.
http://www.evatco.com.au
Eurotubes
Importer and retailer of a variety of European vacuum tubes.
http://www.eurotubes.com
GS Tubes
Offers tubes for home audio and amateur radio.
http://www.gstube.com
Leeds Electronics
NOS tubes, ballast tubes, time delay relays, tube sockets, and thousands of other types of parts.
http://www.leedselect.com
The New Tube
Sells components including tubes, sockets and transformers.
http://www.newtube.com
Tubesdirect
Offers hard to find guitar and hi-fi tubes.
http://www.tubesdirect.com
Triode Electronics
Sells tubes and parts for home audio, radio, guitar and tube data and amp schematics.
http://www.triodestore.com
Vacuum Tube Shop
Offers a range of vacuum, radio and electron tube, electron valve, and transistor amplifiers.
http://www.vacuum-tube-shop.com
Doug's Tubes
Supplier of vacuum tubes for guitar amplifiers and high end audio.
http://www.dougstubes.com/
