| AHF Art Audio | Transformers, Tubes, Schematics |
| Alum Rock Technology | Tube Amplifiers, Transformers |
| Amptek | Tube Guitar Amplifiers, Tubes, Books, Parts |
| Amtrans | Parts, Tubes |
| 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 |
| Antique Sound Laboratory | Tube Amplifiers, Transformers, Parts, Tubes |
| Aqua Blue | Tube Amplifier Kits, Speakers, Parts |
| Audio Consulting | Capacitors, silver wired Transformers |
| Audio Electronic Supply | Tube Amplifier Kits and parts |
| Audio Kit Mania | Parts, Kits |
| Audio Marketing-Bartolucci ??? | Output Transformers |
| Audio Note | Tube Amplifiers, Dac's, Speakers, Parts |
| Audio Part Laboratory APL | Tubes, Transformers, Parts, Vintage gear |
| Audio Transformers | Transformers, Transformer rewinding |
| Audio Workshop Raphael | Tube Amplifier Kits, Tube Amplifier, Transformers |
| AudioAPL | Koma Electronics, tubes, parts |
| Audiokit | Tube Amplifier Kits, Speakers, Parts, Tubes |
| Automatic Electric Europe | Tubes, Transformers |
| Bartolucci Transformers | Transformers |
| Black Art Audio | Transformers |
| BorderPatrol | Tube Amplifiers, PSU's |
| BTB Elektronik - Vertriebs GmbH | Tubes |
| Centro Laboratorio HI-FI | Tube Amplifiers, Parts |
| Classic Components Inc. | Tubes, Japanese Parts |
| Dada Sound Lab | Handwound Transformers |
| Digitex | Tube Amplifier Kits, Tubes, Speakers, Parts |
| DIY Audio Craft | Parts |
| EIFL Corporation | Capacitors, Transformers, Speakers, Tube Amplifier Kits |
| ElectraPrint Audio | Transformers |
| Electra-Print Audio Co. | Transformers |
| Experience Electronics | Tube Amplifier Kits, Parts, Transformers |
| Frag Jan zuerst- Ask Jan first | A lot of information regarding old tube radios |
| GC Elettronica | Tube Amplifier Kits, Transformers |
| Hammond Mfg. Co. (Electronics Group) | Racks, Transformers, Power Bars |
| Handmade Audio Transformers | Transformers |
| Handmade Electronics | Tubes and Parts |
| Hasimoto Transformers | Transformers |
| hificollective | Tube Amplifier Kits, Parts |
| ICL's Audio Products Information and Control Laboratory | Tube Amplifiers |
| Jensen Transformers, Inc. | Transformers |
| Jingau Enterprise | Tubes, Transformers, Parts |
| Klare | Tube Amplifiers, Transformers, Tubes |
| Lancroft Audio Transformers | Tube Amplifiers, Transformers |
| Lundahl Transformers | Fine Swedish Transformer Company |
| MagneQuest | Output Transformers |
| Magnetic SA | Transformers, DIY Tube Amplifiers |
| Majestic Transformer Co. | Transformers |
| Metco Electronics | Parts |
| Noguchi transformers | Transformers |
| Oh's Audio | Tube Amplifiers, Tube Amplifiers Kits, Forum, Parts |
| OlimpiaAudio | Tube Amplifiers, Tubes, Transformers, Parts |
| One Electron | Output Transformers |
| Parts Connexion | Parts |
| Parts Express | Electronics and more |
| Patuxent Communications | Parts, Transformers |
| Peter W. Dahl Co. | Transformers |
| Plitron Manufacturing Inc. | Torodial Mains and Output Transformers |
| Reinhöfer Electronic | Tube Amplifier Kits, Tubes, Parts |
| Roger's Tube Amplifiers & Transformers | Tube Amplifiers Kit |
| SAC Thailand | Tube Amplifiers , Speakers, Tubes, Parts |
| Shinrock | Transformators, Capacitors, Tube Sockest |
| SiverTone Audio | Tube Amplifiers, Output Transformers SE |
| Sowter Audio Transformers | Transformers, Attenuators |
| STF-Electronics | Tubes, Transformers, Tube Amplifier Kit |
| Surplus Sales of Nebraska Index | Parts, Tubes |
| Tamura | Power Transformers, Audio Transformers |
| Tamura Transformers | Transformers |
| THEL Audio Engineering | Tube Amplifier Kits, Tubes and DIY Parts |
| Trafo Baule | Tube Amplifier Kits, Transformer, Tubes |
| Trans Ya | Tube Amplifiers |
| Transformer Manufacturers, Inc. | Transformers |
| Trasformatoriaudio | Transformers |
| Triode Electronics Online Catalog | Tubes, Parts, Tube Data, Schematics, Links |
| Tube Audio Kits. Com | Tube Amplifier Kits, Parts |
| Tubes 4 all | Tube Amplifier Kits, Parts |
| Valve Electronics | Tubes, Parts, repair and restoration of Radios |
| Vintage Hi-Fi | Tubes, Parts, Tube Amplifier Kits |
| Vivaaudio | Tube Amplifiers, Speakers |
| VVT Transformers | Transformers |
| Welborne Labs | Tube Amplifier Kits, Tubes and Parts |
| Well Audio Labs | Capacitors, Resistors, Transformers |
| Welter Electronic | Tube Amplifiers, Transformers |
| Woodside Electronics | Transformers, especially for Radford, Quad |
| World Audio Design | Tube Amplifier Kits from Hifi World |