Triode Electronics Inc. - Supplier of vacuum tubes and other electronic items - http://www.triodeelectronics.com/
Doug's Tubes - Supplier of vacuum tubes for guitar amplifiers and high end audio. - http://www.dougstubes.com/
Langrex Supplies Ltd. - UK supplier of vacuum tubes and other electronic components - http://www.langrex.co.uk/
Eurotubes - Supplier of JJ brand vacuum tubes and other audio items - http://www.eurotubes.com/
Penta Laboratories - Manufacturer and Distributor of electron tubes, vacuum tubes, capacitors, magnetrons and CRT for Broadcast, Industrial, Marine and Avionics. - http://www.pentalaboratories.com/
D and C Electronics - Distributor of electronic vacuum tubes, sockets and magnetrons - http://www.dandcelectronics.com/
Radio Tube Supply - Supplier of vacuum tubes, thermionic valves, and electron tubes - http://www.radiotubesupply.com/
Ampwares - Supplier of vacuum tubes and other tube amp parts - http://www.ampwares.com/
Mesa Boogie - Supplier of vacuum tubes and guitar amplifiers - http://www.mesaboogie.com/
Tubes Ru - Russian supplier of vacuum tubes - http://www.tubes.ru/
AYDN Vacuum Tube Audio - Supplier of tubes, sockets, amplifiers and Hi-Fi speakers - http://www.aydn.com/
Electron Tubes for Industry - Supplier of electron tubes, vacuum tube ,and test equipment. - http://www.elexs.com/
Phamitech (China) - - Supplier of vacuum tubes, electron tubes, sockets, and RF capacitors - http://www.phamitech.com/
Parts Express - Supplier of vacuum tubes and other electronic components - http://www.parts-express.com/
Tube Depot - Supplier of vacuum tubes and other electronic parts - http://www.tubedepot.com/
Vacuum Tube Valley - Supplier of vacuum tubes, audio equipment, and publisher of Vacuum Tube Valley magazine. - http://www.vacuumtube.com/
Antique Electronic Supply - Supplier of vacuum tubes, electron tubes, and other electronic items. Specializing in the antique radio restoration market. - http://www.tubesandmore.com/
BRENT JESSEE RECORDING - Vacuum Tube Sales and other audio supplies. - http://www.audiotubes.com/
KCA NOS Tubes - Audio tubes for guitar amplifiers and audiophile equipment. - http://www.kcanostubes.com/
Tejas Tubes - NOS Vacuum tubes and electron tubes dealer located in Houston Texas - http://www.tejastubes.com
Electron Tubes - Tubes for hi-Fi amateur radio and other applications. - http://www.electrontubes.info/
BOI Audioworks - Vacuum tubes and related components for hifi audio, guitar amplifiers and radio. - http://www.boiaudioworks.com/
The Tube Store. - Buy vacuum tubes online. New and NOS electron tubes. Mostly audio tubes. - http://thetubestore.com/
Radio Electric Supply - New and new old stock vacuum tubes for sale, plus a list of tubes they want to buy. - http://www.vacuumtubes.net/
Watford Valves - Suppliers of valves to the professional music industry. - http://www.watfordvalves.com/
Valve & Tube Supplies - Provides vintage radio valves and tubes. - http://www.valves.uk.com/
Leeds Radio - Brooklyn, New York source for rare and hard-to-find parts and tubes. Includes technical information and vintage advertisements. - http://www.leedsradio.com
SND Tube Sales - Offers a variety of tube and testers. - http://www.vacuumtubes.com/
TubesontheWeb.Com - This site has computerized vacuum tube testers and tubes for sale. - http://www.tubesontheweb.com
Crowthorne Tubes - Crowthorne, Berkshire in England. Buying and selling valves, valve testers, components and test equipment. - http://www.crowthornetubes.com/
Jim McShane Vacuum Tubes - Seller of vacuum tubes for audio primarily. - http://pages.prodigy.net/jimmcshane/
Tube World - Vacuum Tubes For Sale. - http://www.tubeworld.com/tubes.html
A. G. Tannenbaum - Specializing in electronic service data, parts, tubes, old radios and TV sets. Online ordering. - http://www.agtannenbaum.com/
RF Parts Company - Online catalog includes transmitting and receiving tubes for sale. - http://www.rfparts.com/
New Sensor Tubes - Online Catalog of all their tubes for sale. Geared toward audio users, but sell some RF tubes too. - http://www.turnstyle.com/nsc/catalog.asp
Mike's Old Vacuum Tubes - Selling rare old NOS vacuum tubes - Valves For audio, radio, TV, DIY and parts - in Sweden. - http://hem.fyristorg.com/movt/
Micronetics Tubes - NOS or NIB tubes by the major brands of yesteryear. - http://www.micronetics-trading.com/
Classic Valves - Vacuum tube seller. Primarily for guitarists and audiophiles. Store is in Davie, Florida. - http://www.audioweb.com/Store/Store.asp?storeid=62