| 12AX7 tube identification | Information about Tube Audio - Articles |
| 300B's | 300B's |
| Amplifier Tips | Information |
| Audio Cables - Silver Wire | Cables |
| Audio Parvi | Tube Audio Information |
| Audio Products Audio Information | Alliance Audio, Chimera One , Vintage Audio |
| Audiofans.net | Forum, Links, Information |
| Blues Mobile | Information about 6L6 GC VACUUM TUBES |
| Boozhound Laboratories | Articles, DIY Tube Amplifiers |
| Calcolo di Trasformatori | X-former Calculations, DIY Tube Amplifiers |
| Charles MacDonald's Electronic Tube page | Information about Tube Audio - Articles, Links |
| Chicago Joe's Tube Information Page | Information about Tube Audio - Articles |
| Circlotron History Page | Tube Audio Information |
| Class 330 AMPLIFIERS | U.S. Patent Classification Definitions |
| Dirty Harry's Tube Amplifier Page | Tube Audio Information |
| DIY Audio & Video | Information, Links |
| Duncan's Amp Pages | Tube Guitar Amplifiers, Tube Data, Information |
| Eenetasia | Information about Chinese factories |
| Eimac | Eimac's classical tube textbook! |
| Electronic Vacuum Tube Reference Manual - KBápps.com | RCA Receiving Tube Manual |
| Electronics 27 | Information about Tube Audio - Articles |
| Evacuated Envelops - valvelife.txt | Article about Tube Life |
| Friedrich Hunold | Book author, tipps, schematics, forums |
| Fun with Fibrillation A Beginner's Guide to DIY Tube Audio | Tube Amplifier building Information |
| Funkamt Flensburg | Schematics, Tube Comparison List, Links, Tube Radios & Related Vintage Items |
| Gabe's Tubes 'n' Stuff | Information and DIY Tube Amplifiers |
| Gary's Vacuum Tube Web Page | Tube Audio Information |
| Generating X-Rays with Receiving Tubes | Article |
| GEO - the Guitar Effects Oriented Web Page | Tube Amplifiers Services, Tubes, Effects |
| Guitar Amp Evolution | Information about Tube Guitar amps |
| Guitarage Main Page | Information on building a tube amplifier |
| H.-T. Schmidt | Museum, Collection, Information about Tubes |
| Hello, Mister Valve! | Information about tubes, Tube Boxes |
| Helthansen | Information about Tube Audio - Articles |
| Hifi-Notes | Audio Information from Benelux |
| High Fidelity | Audio Information |
| Highend Audio und Hifi auf highendaudio.de | German based Audio Information Platform |
| Homebrew Tube Amp Corner | DIY Tube Audio |
| Isym | Information about Tube Audio - Articles |
| Jim's Citation Amp and Vacuum Tube Page | Tubes, Information |
| Joe's Tube Lore | Information about Tube Audio - Articles |
| Jonz Valve Page | Tube Radios, Links |
| Jonz Valve Page | Tube Radios, Links |
| KCA NOS Tubes | Tubes, Information about Tube Audio - Articles |
| KlausMobile English Index Page | DIY Tube Audio, Information |
| Kutloch | Information |
| Leak | All about Leak and Lowther Amplification |
| mainecoon.com | Information about Tube Audio - Articles |
| Marshall Arts | Information about Tube Guitar Amplifiers |
| Marshall Transformer Codes | Information about Tube Audio - Articles, Schematics, Manuals |
| Meta-Gizmo THE NEW HOME OF THE TRIODE GUILD | The triode Guild of Dr. Gizmo |
| Mighty Physics Page | Information about Tube Audio - Articles |
| Mike's Electric Stuff | Tube Audio Information |
| Music and Guitars and Amps, Oh My! | Links, Information |
| Music Electronics µArchive | Schematics, Information, Links |
| My Hobby | Personal Audio Site |
| Nostalgia Air | Vintage Radio References |
| OEI Obsolete Electronics Inc. | Information about Tube Audio, Transformers |
| Old Tube Radio (Vintage Radio), Luxembourg | Tube Radios & Related Vintage Items |
| Paeng-Design | Information about Tube Audio - Articles |
| Peet's Guitar Tubeamp site | Information about Tube Guitar Amplifiers |
| Quad World | History of Quad Amplifiers |
| Radio D'Epoca | Tube Radios & Related Vintage Items, Parts |
| Research Design Engineering @ PAEng | DIY Tube Amplifiers, Information about TubeAudio - Articles, Forum |
| Rod's Classic & Antique Radios | Military VT Tube Cross Reference |
| Röhrenfieber | Private Tube Audio Sites |
| Rudy Godmaire | DIY Tube Amplifiers, Information |
| Russian Tube Factories and Logos | Logos |
| Russian Valveamplifiers | DIY Tube Amplifiers |
| Seigo Ito | Principles of Vacumm Tubes |
| SJS Electroacoustics | Tube Amplifiers, Parts, Speakers |
| Skip's corner | 12AX7 Tubedata information |
| SoundStage! | Audio Magazine |
| Stan White Audio | Speakers |
| Swan & Vintage Radio Tubes | Information |
| The Audio Equipment Cicuit | Information about Tube Audio - Articles |
| The DIY Audio Corner | Information |
| The Scots Guide to Electronics | Information |
| The Scots Guide to Electronics | Information about Tube Audio - Articles, Basics |
| The Tube Electronics Page | Tube Audio Information |
| The unofficial Ampeg page | Information about Tube Audio - Articles |
| Tube Amp FAQ 1-20-99 (Frames supported) | Musical Instrument Tube Amp Building |
| Tube Amp Information | Information |
| Tube Amplifier Debugging Page | for Tube Guitar Amplifiers |
| Tube amplifier parts, Hoffman Tube Amplifiers | Tube Electronics for Musicians |
| Tube Amps | Information |
| TubeSeller.com | Tubes, Information about Tubes |
| Ultraaudio | Information about Tube Audio - Articles |
| V&T News Visists Svetlana | Factory Tour |
| Vacuum Tube Index | Information, Links |
| Vacuum Tubes, Inc., Electron Tubes | Tubes, Sockets, Manuals, Schematics, Information, Radios |
| Valves Unlimited | Tubes, Tube Audio, Vinyl records |
| Valves' World | Power Amp Guide, Restoration, Books |
| Valvole e Matematica | Information |
| Vandit Kalia DIY Pages | DIY Tube Amplifier |
| Vintage H.H. Scott Hi-Fi Stereo Archive | All about vintage Scott tube audio products |
| Vintage Paper | Vintage Guitar Catalog Reproductions |
| Vintage Radio Components | Tube Radios & Related Vintage Items |
| Vintage Radio Repair and Restoration | Information, Datas, Repair, Restoraration |
| VT.HTM | Military VT-Tube to Commercial Tube Convesion Table and more |
| WA2ISE sub-miniature tube page | Sub-miniature "pencil" tube data |
| WA7ZCZ | Information |
| Wade's Audio And Tube Page | Tube Amplifier circuits and information |
| Wumpus´s Old Radio World | Tube Radio Information |
| Zen clones | DIY Tube Audio Site |