| American Trans-Coil: Manufacturer of military parts including R390A and other radio parts for sale. USA. |
| DaySequerra: Manufacturer of high definition modular tuner designed for professional, audiophile or home theater applications. |
| Music in every room: Provides a radio designed specifically for kitchens and bathrooms. Retail outlets UK electrical wholesale distributors. |
| Nortex Electronic Co.: Surplus test equipment and components, tube amps, RF and power supply components, transformers, capacitors, power resistors, new and used parts. In Fort Worth, Texas. |
| Peter W. Dahl Co.: Transformers and chokes. New, used and custom built. Texas, USA. |
| Radiosophy: Manufacturer of transportable HD Radio receiver. |
| Weybrook: Manufacturer of radio products like dynamo, Internet and HiFi radios. Germany. |
Classical
