| Allied Electronics | Parts |
| Audio Consulting | Capacitors, silver wired Transformers |
| Audio Electronic Supply | Tube Amplifier Kits and parts |
| Audio Kit Mania | Parts, Kits |
| 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 |
| Bartolucci Transformers | Transformers |
| BorderPatrol | Tube Amplifiers, PSU's |
| Classic Components Inc. | Tubes, Japanese Parts |
| Dada Sound Lab | Handwound Transformers |
| 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 |
| Guitar Tube AMP Items | Tubes, Capacitors, Resistors, Transformers |
| Hammond Mfg. Co. (Electronics Group) | Racks, Transformers, Power Bars |
| Handmade Audio Transformers | Transformers |
| Handmade Electronics | Tubes and Parts |
| Jensen Transformers, Inc. | Transformers |
| Lancroft Audio Transformers | Tube Amplifiers, Transformers |
| Leeds Electronics | Tubes and Parts |
| Lundahl Transformers | Fine Swedish Transformer Company |
| MagneQuest | Output Transformers |
| Majestic Transformer Co. | Transformers |
| Metco Electronics | Parts |
| Noguchi transformers | Transformers |
| Oh's Audio | Tube Amplifiers, Tube Amplifiers Kits, Forum, Parts |
| Omak | Tube Amplifiers |
| One Electron | Output Transformers |
| Parts Connexion | Parts |
| Plitron Manufacturing Inc. | Torodial Mains and Output Transformers |
| Reinhöfer Electronic | Tube Amplifier Kits, Tubes, Parts |
| RF Parts Company™ Amateur Radio Catalog | Tubes, Parts |
| Roger's Tube Amplifiers & Transformers | Tube Amplifiers Kit |
| Shinrock | Transformators, Capacitors, Tube Sockest |
| Sowter Audio Transformers | Transformers, Attenuators |
| STF-Electronics | Tubes, Transformers, Tube Amplifier Kit |
| Surplus Sales of Nebraska Index | Parts, Tubes |
| TAD - The Tube Amp Doctor | Tubes, Parts |
| 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 |
| Transformer Manufacturers, Inc. | Transformers |
| Trasformatoriaudio | Transformers |
| Triode Electronics Online Catalog | Tubes, Parts, Tube Data, Schematics, Links |
| Tube Amp Doctor GmbH | Tubes |
| Tubes 4 all | Tube Amplifier Kits, Parts |
| Van Weelden | Tubes, Parts |
| Vibroworld.com | Discount Tube Guitar Amp parts, tubes |
| Vintage Hi-Fi | Tubes, Parts, Tube Amplifier Kits |
| VVT Transformers | Transformers |
| Welborne Labs | Tube Amplifier Kits, Tubes and Parts |
| West Coast Magnetics | Custom design Output Transformers, Chokes, Power Transformers |
| World Audio Design | Tube Amplifier Kits from Hifi World |