| Audiokit | Tube Amplifier Kits, Speakers, Parts, Tubes |
| Golden Sound | Cones |
| Hi-Fi News and Record Review Accessories Club | Tubes and Audio Accessories |
| Shun Mook Audio, Inc. | Tube Resonators |
| Star Sound Technologies | Cones |
| THL Audio | Parts |
| Welborne Labs | Tube Amplifier Kits, Tubes and Parts |