California Tube Laboratory, Inc.  
   Electron tube and vacuum tube manufacturer. High power CW and pulse magnetrons, klystrons and power grid tubes. Product listings and data sheets, and outline drawings.
   http://www.caltubelab.com

Lohmann X-Ray  
   Manufacturer of industrial and medical X-ray tubes, including tubes for medical, dental, and industrial applications.
   http://www.lohmannx-ray.com/

House of Tubes  
   Ham radio and audio tubes. Online catalog with secure ordering.
   http://www.house-of-tubes.com/

Tube World, Inc.  
   Vacuum tubes and sockets for sale.
   http://www.tubeworld.com/

Electron Tube Data Sheets  
   Type index, high powered tubes and data sheets in PDF format.
   http://www.mif.pg.gda.pl/homepages/frank/

Electron Tubes for Industry  
   Mostly industrial product line.
   http://www.elexs.com/2Xmtg.htm

Brand X-ray Tube Co., Inc.  
   Manufacturer of x-ray tubes for use in medical, dental and industrial imaging and inspection applications.
   http://www.brandx-ray.com/

Antique Electronic Supply  
   Books, transformers, capacitors, and resistors. Has an online catalog and shopping cart.
   http://www.tubesandmore.com/

The Invention of the Vacuum Tube  
   In 1879, the American inventor Thomas Edison publicly exhibited his incandescent electric light bulb for the first time.
   http://www.maxmon.com/1883ad.htm

MachMat main  
   Vacuum tubes for the audio amp market.
   http://www.machmat.com/sales/

Freeland Products, Inc.  
   Rebuilder of vacuum power grid tubes for industrial, radio and television applications.
   http://www.freeland-inc.com/

The Tube Center  
   Providing HAM and amateur radio operators, antique radio enthusiasts, audio professionals and hobbyists the ability to choose from an inventory over 2000 different tube types.
   http://www.thetubecenter.com/

20000 NOS Electron Tubes  
   NOS and used tubes, rare valves, virtual museum.
   http://geocities.com/nikolic_lj_dragan/Tubes/NOSElectronTubes.htm

TubeTronic  
   Vintage Vacuum Tubes and Test Equipment. Audio tubes, TV tubes, Radio tubes and Electron tubes. 12ax7, 12au7, 12at7, Generators, Analyzers, and Counters.
   http://www.TubeTronic.com

Kennetron, Inc  
   Offering rebuilt vacuum, oscillator, induction and transmitter tubes.
   http://www.kennetron.com/

Mike's Electric Stuff  
   Antique Glass and Vacuum stuff, for electronics and high voltage.
   http://www.netcomuk.co.uk/~wwl/electric.html

Yueqing Zhengli Rectifier Corp.  
   Tube rectifiers. Site in English and Chinese.
   http://www.chinazenli.com/

Vacuum Tube Valley  
   All about vacuum tubes. Tube audio amp kits.
   http://www.vacuumtube.com/

Tube Database Search  
   From NJ7P Great site for tube searches.
   http://hereford.ampr.org/cgi-bin/tube

Electron Tube Enterprises  
   Supplier of new and used tubes, specialising in hard to find radio and audio tubes for vintage electronic equipment. Online catalogue, price list and purchasing.
   http://members.aol.com/etetubes/

Superior X-Ray Tube Company  
   Manufactures high quality custom-made x-ray tubes for a wide range of applications such as thickness gauging, food inspection, bone densitometry, dental, medical, and baggage inspection.
   http://www.superiorxraytube.com

Vacuum Tube Links  
   A long list mostly audio stuff.
   http://www.acadia.net/guest/michelle/tubes.htm

N9Tew  
   A supplier of vacuum tubes for ham, audio and antique radio purposes.
   http://www.hamtubes.com/tubes/

Vacuum Tubes, Inc.  
   Worldwide sellers of vacuum tubes and electron tubes for audio, radio, and industry
   http://www.vacuumtubesinc.com/

Thales Electron Devices  
   Provides electron tubes for space, telecom, radio and TV broadcast, military , X-ray imaging, science and industry applications. Includes products specifications and application notes. Formerly Thomson Tubes Electroniques.
   http://www.thales-electrondevices.com/

D & C Electronics  
   World-wide distributor of electron tubes, sockets and magnetrons. Replacement tubes for Perkin Elmer mass spectrometer.
   http://www.dandcelectronics.com

Collins Tube Specials  
   Listing of surplus tubes, searchable database.
   http://www.surplussales.com/Tubes-Sock-Acc/VacTubeIndex.html

New Sensor Corporation  
   Manufacturer and wholesale distributor of vacuum tubes and electronic parts. Sovtek tubes.
   http://www.sovtek.com

Michelle Troutman's Electronics Items  
   NOS and used vacuum tubes; also, service manuals and Sams Photofacts, parts, magazines, books, radios and test equipment.
   http://www.michelletroutman.com

Magnatek X-ray sources  
   "Integrated X-ray generators". Also prototype x-ray sources. Danish company.
   http://www.xray.dk

Pacific TV Vacuum Tube Sales  
   Vacuum tubes for radio, audio and amateur use. Over 1,000 types with regular 5 lot sleeve specials. Canadian site.
   http://members.shaw.ca/pacifictv

Tom's Tubes  
   Russian PA tubes. Paypal.
   http://www.tomstubes.com

Vintage SoundWorks  
   Service for all makes of vintage tube amplifiers and radios. NOS and new and used vacuum tubes.
   http://www3.sympatico.ca/v.soundworks/

Daily Electronics Corp.  
   Electron and vacuum tubes. Industrial, military, broadcast and entertainment applications supplied from inventory. Hard to find and obsolete tubes available.
   http://www.worldaccessnet.com/~daily/daily.html

DBtubes.com  
   New old stock, new bulk and used tested tubes. Canadian site.
   http://www.geocities.com/dbtubes2002/

Tuboselectronicos Chile  
   Sell and buy electron vacuum tubes in South America.
   http://www.tuboselectronicos.co.cl

Phamitech International Company Ltd  
   Exporter of electron tubes, TWT, valves, thyratrons, magnetrons, klystrons, transmitting tubes, heating tubes, vacuum interrupters and X-ray tubes made in China
   http://www.phamitech.com

Penta Laboratories  
   Manufacturer and distributor of electron tubes for broadcast, industrial, marine and avionics applications worldwide.
   http://www.pentalaboratories.com/