| Allegro | Tube Amplifier Book |
| Amptek | Tube Guitar Amplifiers, Tubes, Books, Parts |
| Angela Instruments | Parts, Speakers, Tubes |
| Antique Electronic Supply | Attenuators, Books, Capacitors, Enclosures, Guitar Parts, Knobs, Manuals, Potentiometers, Resisitors, Tubes, Tube Boxes, Tube Sockets, Speakers,Tools, Transformers, Wires |
| Audio Speaker Design Calculators | for Speakers |
| Audion - La tua rivista di elettronica | Tubes, Books, Speakers, Records |
| Bequaert old books | Book |
| British Audio Products Online | Tubes, Books |
| CE Distribution LLC Tube Accessories | Parts, Tubes |
| Digitex | Tube Amplifier Kits, Tubes, Speakers, Parts |
| DIY Hi-Fi & Tubes | Tubes, Tube Amplifiers KITS, Parts, Books |
| Duncan's Amp Pages | Tube Guitar Amplifiers, Tube Data, Information |
| Elderly Instruments Elderly Instruments | Books, Instruments Retailer |
| EventCom | Books |
| Experience Electronics | Tube Amplifier Kits, Parts, Transformers |
| Friedrich Hunold | Book author, tipps, schematics, forums |
| GlassWare | Audio Design Software |
| Hi-Fi News and Record Review Accessories Club | Tubes and Audio Accessories |
| Hifi Speaker Design | Information |
| hificollective | Tube Amplifier Kits, Parts |
| Infotronix | Manuals, Schematics |
| Island Audio | Retailer, Books & Software |
| KBápps.com | RCA Receiving Tube Manual |
| Media Concepts | Books, Links, Tubes |
| Next Power Company | Articles, Software |
| Onkel frihu's Community das Forum | German Forum about Tube Audio |
| Pispola Patrizia | Componenti elettronici |
| PR Novelty | Tube Radios, Radio Services, Tubes |
| Radio 711 | RCA Manual online |
| Radio Attic | Tube Radios, Links, Classifieds |
| SAMS Technical Publishing | Books |
| Sonoran Publishing | Books |
| The Antique Wireless Association | Museums, Books, Links |
| The Tube CAD Journal Table of Contents | Software |
| The Tube Shop | Tubes, Books |
| THEL Audio Engineering | Tube Amplifier Kits, Tubes and DIY Parts |
| THL Audio | Parts |
| Torres Amps | Tube Guitar Amplifiers, Kits, Parts, Tubes |
| Transcendent Sound | OTL Tube Amplifiers, Kits, Books, BBS |
| Triode Electronics Online Catalog | Tubes, Parts, Tube Data, Schematics, Links |
| True Audio - Loudspeaker Design Software | Software |
| Tube Amp FAQ 1-20-99 (Frames supported) | Musical Instrument Tube Amp Building |
| Tube amplifier parts, Hoffman Tube Amplifiers | Tube Electronics for Musicians |
| Valve Electronics | Tubes, Parts, repair and restoration of Radios |
| Vintage Radios | Tube Radios & Related Vintage Items, Information |
| Welborne Labs | Tube Amplifier Kits, Tubes and Parts |
| World Audio Design | Tube Amplifier Kits from Hifi World |