The AVR-11A was a rack mount receiver with gray painted panel but without a chassis dust cover and with matching rack mount speaker.The AVR-11B was a rack mount with dust cover with black painted panel and rack mount speaker.Each band required three coils, RF Amp, Mixer and Local Oscillator which gave the user five tuning ranges. It's likely that less than 100 RHM receivers were built and only a few survive today since most of the airport equipment was scrapped when it became obsolete.
Dating vintage radios
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 $123.
Or, if the ham couldn't wait, he could opt for the Hammarlund Comet Pro, the only other commercially-built shortwave superhet available at the time.
In the article there was a photo of the Radio News' AGS set-up that showed they were using a National Dog House power supply and a set of Hi-Z 'phones for the audio output.
I've been running my RHM in this fashion also, using a National 5886 PS (6.3vac Filament and 180vdc B ) and then listening on a pair of Type-C Navy Baldwin 'phones.
The AGS was upgraded with newer tube types and other changes during its short production life (probably two or three production runs totaling no more than 300 receivers.) The major change was with the introduction of the AGS-X that added a front panel BFO control and a James Lamb type crystal filter to the receiver.
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.
By the early thirties, National had grown from a company that produced radio parts and regenerative TRF receivers into one of the top shortwave receiver producers in the country.
National's chief engineer and general manager, James Millen, had guided the company from its early radio designs (that usually had National as a parts supplier) into the new shortwave receiver market that was becoming popular by 1930.
Actually, the Comet Pro was only 5 (and it had a built-in power supply) but it didn't have an RF stage and required an external pre-selector for image-free reception above 10mc.