| All Electronics | Electro-Mechanical and Electronic Parts |
| Farnell | Parts, Tools |
| Fuses Unlimited | Fuses |
| Keystone Electronics Corp. | Standoffs, Fuse Holders |
| Memory Protection Devices Inc. | Fuse Holders |
| Parts Connexion | Parts |
| Soynia Electronics | Parts |
| TAD - The Tube Amp Doctor | Tubes, Parts |
| Tube Amp Doctor GmbH | Tubes |
| Van Weelden | Tubes, Parts |
| Welborne Labs | Tube Amplifier Kits, Tubes and Parts |
| Wickmann | Fuses, Fuse Holders |