This was one of our longer-term projects. We took a 60-year-old, well regarded
communications receiver, brought it back to its original specifications and then
modified it to meet today's standards.
The HRO's were a series of receivers manufactured by the National Company that
were first introduced in the 1930's. The HRO receivers were so well regarded during
WWII that they were copied by the Japanese, Germans, Soviets and Australians (in
that last instance, under license from the National Company). The HRO-60 was the
last of the vacuum tubed HRO's and was manufactured from 1950 through 1967, a
very long life for a communications receiver. Subsequent to the HRO-60, National
produced two solid state HRO's, the technically advanced HRO-500 and the ultra
Our HRO-60 was in fairly good shape. Cosmetically, it didn't show its age. Most
importantly, it was complete and for the most part, unmolested. We dated its
manufacture through component date codes to around the fall of 1951, a fair early
Click on the topics to the left to follow the various stages of restoration and the
modifications we did to this receiver.