| Alum Rock Technology | Tube Amplifiers, Transformers |
| 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 Consulting | Capacitors, silver wired Transformers |
| Audio Electronic Supply | Tube Amplifier Kits and parts |
| Classic Components Inc. | Tubes, Japanese Parts |
| Electra-Print Audio Co. | 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 Electronics | Tubes and Parts |
| Lundahl Transformers | Fine Swedish Transformer Company |
| Metco Electronics | Parts |
| Noguchi transformers | Transformers |
| Peter W. Dahl Co. | Transformers |
| Play Things Of Past | Tubes, Parts |
| Sowter Audio Transformers | Transformers, Attenuators |
| Tubes 4 all | Tube Amplifier Kits, Parts |
| VVT Transformers | Transformers |
| Welborne Labs | Tube Amplifier Kits, Tubes and Parts |