| Alum Rock Technology | Tube Amplifiers, Transformers |
| Amtrans | Parts, Tubes |
| Angela Instruments | Parts, Speakers, Tubes |
| Aqua Blue | Tube Amplifier Kits, Speakers, Parts |
| Audio Consulting | Capacitors, silver wired Transformers |
| Audio Note | Tube Amplifiers, Dac's, Speakers, Parts |
| Audio Part Laboratory APL | Tubes, Transformers, Parts, Vintage gear |
| AudioAPL | Koma Electronics, tubes, parts |
| Audiokit | Tube Amplifier Kits, Speakers, Parts, Tubes |
| Bartolucci Transformers | Transformers |
| Black Art Audio | Transformers |
| BorderPatrol | Tube Amplifiers, PSU's |
| Classic Components Inc. | Tubes, Japanese Parts |
| Dada Sound Lab | Handwound Transformers |
| Digitex | Tube Amplifier Kits, Tubes, Speakers, Parts |
| Edcor Electronics | Transformers |
| ElectraPrint Audio | Transformers |
| Electra-Print Audio Co. | Transformers |
| GOLDEN MIDDLE | Tube Amplifiers, Transformers, Tubes |
| hificollective | Tube Amplifier Kits, Parts |
| Lancroft Audio Transformers | Tube Amplifiers, Transformers |
| Lundahl Transformers | Fine Swedish Transformer Company |
| Play Things Of Past | Tubes, Parts |
| Stevens & Billington Ltd Audio Transformers | Interstage Transformers |
| Tamura | Power Transformers, Audio Transformers |
| Tamura Transformers | Transformers |
| Tubes 4 all | Tube Amplifier Kits, Parts |
| VVT Transformers | Transformers |