Frank's Electron Tube Pages
- Vacuum tube, vintage radio and other electronics information. Tube data sheets and pinout.
- http://www.tubedata.org/

Tubeopedia
- A wiki encyclopedia of information on vacuum tubes and related topics including equipment that uses tubes, circuits, theory, and companies.
- http://www.tubeopedia.com/index.php?title=Main_Page

Triode Electronics, Inc.
- Tubes and parts for hi-fi, radio and guitar. Tube data and amp schematics, links to tube amp information.
- http://www.triodeelectronics.com/

Triode Tubes
- Electronic tube technology featuring books, articles, schematics, video and sound clips.
- http://triodetubes.com/

The Tubes and Valves Online Database
- European electron tube charts with characteristic data, basing diagrams, and application info. Includes Russian types.
- http://www.ginko.de/user/franz.hamberger/infobase/charts/roehren/

Clocks with Nixietubes
- Various types of time keeping devices made with Nixie tubes and Nixie tube like componenets.
- http://www.nixieclocks.de/

Rf Power EXchange
- RF power tubes and transistors, large inventory.
- http://www.rfpowerx.com/

The Tube CAD Journal
- A monthly webzine devoted to vacuum tube circuit design and understanding.
- http://www.tubecad.com/

TechInfo_2
- Vacuum tube equations, design and technical information.
- http://www.aikenamps.com/TechInfo_2.htm

Glowbugs
- Vacuum tube circuits, some theory, manuals, and calculators.
- http://www.mines.uidaho.edu/~glowbugs/

Dr. Tube
- Tube amp schematics, tube datasheets and other tube related technical info.
- http://www.drtube.com/

World Tube Audio Portal
- Audio tube related link list, forums and newsgroups, tube amplifier collection and tweaking. Audio amplifiers that use tubes. Tube replacement list included.
- http://www.worldtubeaudio.com/

JMH's Virtual Valve Museum
- An extensive collection of pictures and information of old, unusual and unique vacuum tubes.
- http://www.tubecollector.org/

Tube Collectors Association
- A great resource for tube theory and operation. Quite a bit of history also.
- http://www.tubecollectors.org/

Eimac's
- Care and feeding of power grid tubes. A lot of information on beam power tubes also.
- http://www.cpii.com/eimac/cf.htm

RadioPistoia by Pierluigi
- Audio tube amplifier project. European tube number guide. Links to other tube sites. [English, Italian]
- http://www.radiopistoia.com/

Svetlana Applications Notes
- Application notes on the care and feeding of Svetlana tubes, mostly for high power service.
- http://www.rfparts.com/tubesvet.html#svetlana

Cathode Corner
- A scope clock, and tiny scope museum. The "Scope Clock" kit may be purchased.
- http://www.cathodecorner.com/

Tube Rebuilders
- Technical data, theory, trouble shooting information for high power tubes.
- http://www.econco.com/

Vacuum Tubes
- N9TEW is supplier of vacuum tubes for ham, audio and antique radio purposes.
- http://www.hamtubes.com/tubes/

Shortwave Transmitter Tubes
- A service from TDP with links to and information about the manufacturers, rebuilders and distributors/suppliers of tubes. An extensive list of data sheet sources.
- http://www.tube.be

Tube Datasheet Database
- Datasheets for about 3,000 vacuum tubes.
- http://www.nj7p.org/cgi-bin/tube

Vintage H.H. Scott Hi-Fi Stereo Archive
- This site promotes open sharing of information, understanding and historic appreciation of vintage H.H. Scott (vacuum tube) consumer high fidelity audio products produced from 1946 through 1966.
- http://hhscott.com

Vacuum Tube Index
- Vacuum tube resources for students and more advanced users.Everything from fundamental techniques to SPICE simulation.
- http://www.ee.ualberta.ca/~schmaus/elect/tdex.html

Duncan's Amp Pages
- Resources for vacuum tubes. A data sheet data base for tubes. SPICE models for vacuum tubes, and software available for download.
- http://www.duncanamps.com/

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

Vacuum Tube FAQ
- How to use them and how they work. One of the more accurate vacuum tube FAQs on the net.
- http://shay.ecn.purdue.edu/~busenitz/vac.html

Vacuum tube FAQ
- How to use them and how they work. List of tubes and what they are used for.
- http://www.vacuumtube.com/FAQ.htm

Russian/Soviet
- Tube factories and their logos.
- http://www.ominous-valve.com/russtube.html

Mike's Electric Stuff
- Antique glass and vacuum stuff, for electronics and high voltage.
- http://www.electricstuff.co.uk/

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