Dating rca vacuum tubes
There were three models available, the AVR-11 that was installed in a metal cabinet with matching speaker.
The AVR-11A was a rack mount receiver with gray painted panel but without a chassis dust cover and with matching rack mount speaker.
Today, the RHM performance seems antiquated and crude but in 1932 it was "state-of -the-art" and the fact that the receiver is still operating and is still fairly accurate in its dial readout is testament to National's build quality and Herbert Hoover Jr. This same design team again worked together in 1934, producing the famous HRO receiver.
RCA supplied some airports with this 16 tube superheterodyne receiver beginning around 1937.
RCA included a BFO, a sensitivity control, a noise suppressor circuit and a headset output jack - all necessities for a communication receiver.
Additionally, an optional Crystal Filter assembly was available on special order.
If a person wanted to know my sins and they kept telling me all kinds of sins and they come across a sin ive done and i say no bcz i don't want them to know only god.
Plug-in coils to select the tuning ranges, a separate power supply and a micrometer-type tuning dial are foremost in the design and were to become standard features for National receivers over the next several years.
In 1934, optional 10 meter coils were added as the AGS frequency coverage was increased to reflect the needs of a "ham receiver" - although at 5, not many hams could afford it.
If the ham really wanted the AGS-X he could wait for the introduction of the HRO (in early 1935) at which time Leeds was selling the AGS-X for 3.
Also, National produced a long wave receiver built along the same lines as these early airways receivers, the RIO.
The RIO didn't use plug-in coils but had two switched tuning ranges that covered frequencies below 500kc.