| Acoustic Masterpiece presented by axiss-usa | Tube Amplifier Kits |
| Antique Electronic Supply | Attenuators, Books, Capacitors, Enclosures, Guitar Parts, Knobs, Manuals, Potentiometers, Resisitors, Tubes, Tube Boxes, Tube Sockets, Speakers,Tools, Transformers, Wires |
| Aqua Blue | Tube Amplifier Kits, Speakers, Parts |
| Arizona Tube Audio | Tubes |
| Aspen Amplifiers | Tube Amplifier Kits |
| Audio by Decware ™ | Tube Amplifiers, Kits, Speakers, Links, Forums |
| Audio Concept Hi-Fi | Tube Amplifier Kits |
| Audio Consulting | Capacitors, silver wired Transformers |
| Audio DIY Kits Supplier | Tube Amplifier Kits |
| Audio diy kits supplier | Tube Amplifier Kits |
| Audio Electronic Supply | Tube Amplifier Kits and parts |
| Audio Note | Tube Amplifiers, Dac's, Speakers, Parts |
| Audio Professor | Tube Amplifier Kits |
| Audio Workshop Raphael | Tube Amplifier Kits, Tube Amplifier, Transformers |
| Audiokit | Tube Amplifier Kits, Speakers, Parts, Tubes |
| Audiokits.com | Tube Amplifier Kits |
| Audion | Tube Amplifiers Kits, see als paudion4.htm |
| Audion | Tube Amplifiers |
| Bartolomeo Aloia | Tube Amplifier Kits |
| Borbely Audio | Tube Amplifier Kits, Tubes |
| Bottlehead.com | Kits, Parts, Information |
| Curcio Audio Engineering | Tube Amplifier Kits |
| DHTsound.com | Japanese Portal, Parts, Tube Amplifier Kits, tubes, forums, links |
| Digitex | Tube Amplifiers Kits, Parts |
| Digitex | Tube Amplifier Kits, Tubes, Speakers, Parts |
| DIY audio | Tube Amplifiers Kits, forums |
| Diyhifisupply | Tubes, Tube Amplifiers KITS, Parts |
| EIFL Corporation | Capacitors, Transformers, Speakers, Tube Amplifier Kits |
| Elekit JP | Tube Amplifer Kits |
| Elektor - die Zeitschrift für Elektronik und Computertechnik | Tube Amplifier Kits, magazine |
| ELV online | Tube Amplifier Kits, Parts |
| Essential Audio | Tube Amplifier Kits |
| Essential Audio by Generoso Cozza | Tube Amplifier Kits |
| Experience Electronics | Tube Amplifier Kits, Parts, Transformers |
| Feliciano Ferretti | Tube Amplifiers, Tube Amplifier Kits |
| Fidelity Audio | Tube Amplifier Kits |
| Gabe's Tubes 'n' Stuff | Information and DIY Tube Amplifiers |
| GC Elettronica | Tube Amplifier Kits, Transformers |
| Glasscase Amplifiers | Tube Amplifier Kits |
| GR Research | Speakers, Tube Preamplifiers, Tube Preamplifier Kits |
| Guytronix | Tube Guitar Amplifiers, Tube Amplifier Kits |
| Hagerman Technology LLC | Tube Amplifiers, Tube Testers |
| HAJDINJAKLABS | Tube Amplifiers |
| 'HAWK' High End Audio Equipment | Tube Amplifier Kits |
| HB-AmpDesign | Tube Amplifier Kits, Tubes, Parts |
| Hi-Fi audiophile Amplificateurs à tubes haut rendement | Tube Amplifiers |
| hificollective | Tube Amplifier Kits, Parts |
| IAG | Tube Amplifier, Tube Amplifier Kits |
| Ikarus Audio | Tube Amplifier, Tube Amplifier Kits |
| Krypton | Retailer, Tube Amplifier Kits |
| Lighthouse Electric | Tube Amplifier Kits |
| London Power Amplifiers | Tube Amplifier Kits and Books for Musicians |
| Mapletree Audio Design | Tube Amplifier Kits |
| Marsh Tubes and Amplifier Service | Tube Amplifier Kits, Tube Amplifier Service |
| Moondog Audio | Tube Amplifier Kits, Speakers |
| Octave Electronics | Parts |
| Oh's Audio | Tube Amplifiers, Tube Amplifiers Kits, Forum, Parts |
| Opera Audio | Tube Amplifiers |
| Parts Express | Electronics and more |
| Passion Audio Kit | Tube Amplifier Kits |
| Past Audio | Tube Amplifiers |
| Praktiker Verlag, Wien (Austria) | Audio Magazine, DIY Tube Amplifiers |
| RadiiAudio | Tube Amplifiers |
| Raphael audio workshop - tube audio kits | Tube Amplifiers Kits |
| Real Audio Technika | Tube Amplifiers, Output Transformers |
| Reinhöfer Electronic | Tube Amplifier Kits, Tubes, Parts |
| Roger's Tube Amplifiers & Transformers | Tube Amplifiers Kit |
| Rotac Électronique inc. | Tube Amplifier Kits |
| S-5 Electronics | Tube Amplifier Kits |
| Sonofield | Tube Amplifiers, Tube Amplifier Kits |
| Soriaudio | Forums, Links, Enclosures, Transformers |
| STF-Electronics | Tubes, Transformers, Tube Amplifier Kit |
| Sun Audio | Tube Amplifiers |
| Tektron-Italia | NOS Tubes, Radios, Tube Amplifiers, Service |
| The Wright Sound Company | Tube Amplifier Kits |
| THEL Audio Engineering | Tube Amplifier Kits, Tubes and DIY Parts |
| Torres Amps | Tube Guitar Amplifiers, Kits, Parts, Tubes |
| Trafo Baule | Tube Amplifier Kits, Transformer, Tubes |
| Transcendent Sound | OTL Tube Amplifiers, Kits, Books, BBS |
| Triod Ljud | Edison, Audion Tube Amplifiers |
| Tube Audio Kits. Com | Tube Amplifier Kits, Parts |
| Tube Town | Tubes, Parts, Kits |
| tube4hifi | Tube Amplifier Service, Tube Amplifier Kits |
| Tubebuilder.Com | Tube Amplifier Kits, Tube Datas, schematics |
| Tube-Kit | Acoustic Masterpiece Tube Amplifier Kits |
| Tubes 4 all | Tube Amplifier Kits, Parts |
| Ultratone Amplifier & Supply Company | Tube Guitar Amplifiers, Tube Guitar Amplifier Kits |
| Vacuum State Electronics | Books, Tube Amplifier Kits |
| Vacuum Tube Valley | Tube Audio Magazine, Tubes, Parts, Service, Vintage Hifi Rebuild Kits, Capacitors |
| Velleman Kit | Tube Amplifier Kits |
| Viking SW Produce valve (tube) equipment | Tube Radio Receiver Kits |
| Vintage Hi-Fi | Tubes, Parts, Tube Amplifier Kits |
| VT-62 Tube Amplifier | Japanese DIY Tube Amplifier |
| Welborne Labs | Tube Amplifier Kits, Tubes and Parts |
| World Audio Design | Tube Amplifier Kits from Hifi World |
| World Tube Audio Kits | Serious Tube Amplifier Kits, Tube Amplifier Service, Speakers |
| World Tube Audio Portal | Links, Kit building service |
| Wright Sound Company | Tube Amplifiers |
| Yamamoto Sound Craft Homepage | Japanese Tube Amplifiers and Parts |
| Yogoo | Tube Amplifiers |
| Yoshiba Onkyo | Japanese Tube Amplifiers and Spaekers |