Historic American brand known for manufacturing high-quality amateur radio communications receivers, transmitters, and radio components from 1910 to 1973.
The Hammarlund Manufacturing Company, founded by Oscar Hammarlund in 1910, was a pioneering American manufacturer of radio equipment and communications receivers. Originally based in New York City and later in Mars Hill, North Carolina, Hammarlund became famous for its short-wave superheterodyne receivers—such as the renowned HQ and SP series—as well as its industry-standard variable tuning capacitors.
Although the company officially dissolved in 1973, its ruggedly built 'boatanchor' receivers remain highly regarded and actively preserved by vintage amateur radio enthusiasts and collectors worldwide.
Latest manuals from manuals+ curated for this brand.
Common questions about manuals, registration, and support for this brand.
We provide a collection of original instruction manuals, user guides, and schematics for classic Hammarlund models like the HQ and SP series here on Manuals.plus.
No, the Hammarlund Manufacturing Company was dissolved in 1973, but their classic radio equipment is still highly popular among amateur (ham) radio enthusiasts and collectors.
According to original Hammarlund manuals, a single wire indoor antenna (20 to 50 feet) or a tuned half-wave outdoor dipole fed with a 300-ohm transmission line works best for tuning into shortwave bands.
Hum in vintage tube receivers can often be reduced by properly grounding the receiver and ensuring proper AC plug polarity. If it persists, it may indicate that aging electrolytic capacitors in the power supply section need replacing.