Overview
National Radio Company was an American manufacturer of communications receivers, amateur radio equipment, transmitters, and electronic accessories. Founded in 1914 in Malden, Massachusetts, National became one of the leading producers of high-performance radio communications equipment during the vacuum tube era.
The company was especially known for its HRO series communications receivers, which were widely used by amateur radio operators, commercial communications services, military organizations, and government monitoring stations throughout the world.
National equipment developed a reputation for precision engineering, excellent receiver sensitivity, and rugged construction.
Description
National Radio Company began during the early development of wireless communications and initially produced radio parts and regenerative receivers. During the 1930s the company expanded into advanced communications receiver manufacturing and became one of the major American producers of amateur and professional radio equipment.
National products included:
- Communications receivers
- Amateur radio receivers
- Transmitters
- Coil sets and accessories
- Mobile communications equipment
- Shortwave receivers
The company competed with other major American communications manufacturers including:
HRO Series
National’s most famous products were the HRO series receivers introduced in 1935.
The HRO receivers became highly respected for:
- Precision micrometer dial tuning
- Plug-in coil sets
- Excellent selectivity
- High sensitivity
- Mechanical stability
HRO receivers were widely used by:
- Amateur radio operators
- Allied military monitoring stations
- Intelligence services
- Commercial radio operators
- Government agencies
During World War II, HRO receivers were extensively used by Allied military and intelligence organizations for monitoring and intercept operations.
Postwar Products
After World War II, National continued producing advanced tube communications receivers and amateur radio equipment.
Popular postwar models included:
- HRO-50
- HRO-60
- HRO-60T
- NC-183D
- NC-300
- NC-303
The company remained active into the 1960s but faced increasing competition from newer solid-state equipment and imported Japanese electronics during the late tube era.
Historical Timeline
| Year | Event |
|---|---|
| 1914 | National Radio Company founded in Malden, Massachusetts |
| 1920s | Produced early radio receivers and components |
| Early 1930s | Expanded communications receiver development |
| 1935 | HRO communications receiver introduced |
| Late 1930s | National became major supplier of amateur and commercial communications receivers |
| World War II | HRO receivers widely used by Allied military and intelligence services |
| Late 1940s | Expanded postwar amateur radio product lines |
| 1950s | NC and HRO receiver series modernized |
| Late 1950s | HRO-50 and HRO-60 introduced |
| 1960s | Continued production of advanced tube communications receivers |
| Late 1960s | Competition from solid-state equipment increased |
| 1970s | Company operations declined and eventually ceased |
Historical Addresses
| Year | Address |
|---|---|
| Early Operations | Malden, Massachusetts |
| Mid-1900s | National Radio Company, 61 Sherman Street, Malden, Massachusetts |
Legacy
National Radio Company remains one of the most respected names in vintage American communications receivers.
Its HRO series receivers are considered among the finest vacuum tube communications receivers ever produced and remain highly collectible among amateur radio operators, restorers, and vintage radio enthusiasts.
National equipment played an important role in both civilian and military radio communications during the twentieth century.