| Audio Electronic Supply | Tube Amplifier Kits and parts |
| Audio Note | Tube Amplifiers, Dac's, Speakers, Parts |
| Audiokit | Tube Amplifier Kits, Speakers, Parts, Tubes |
| CAIG Laboratories, Inc. | Connector Enhancing Treatments |
| Electronix Express | Parts |
| Farnell | Parts, Tools |
| Gabe's Tubes 'n' Stuff | Information and DIY Tube Amplifiers |
| Hinkel-Elektronik | Parts |
| M.M. Newman | Tools |
| Main Electronics Receiving Tube Page | Tubes, Parts |
| Maplin Electronics | Parts |
| MarVac Home | Parts |
| Newark Electronics | Potentiometers, Parts |
| Parts Express | Electronics and more |
| Products International | Tools, Soldering Equipment |
| RP Electronics | Tubes, Test Instruments , Power Supplies |
| THL Audio | Parts |
| WBT USA | RCA Type Connectors, Binding Posts, Spade Connectors, Silver Solder, Banana Plugs |
| Welborne Labs | Tube Amplifier Kits, Tubes and Parts |