[Arran]

Quote " @ Arran, I have an RCA 5T7 ca 1936 -7 that has a similar scheme, green pointer for BC, red pointer for SW. However, the dial is rather small and not as exciting as a Zenith Big Black Dial or others." 
 
 I rather like the way that RCA sets were built in that era, unfortunately they do suffer from power supply failures more then their earlier sets, not as bad as the early 40s Brand Z sets though. RCA, and in Canadian GE, and others seemed to like using that tube lineup, it was completely unnecessary to separate the detector, and AVC diodes from the first audio triode but it allowed them to market a five tube set as a six tube without adding anything but an extra socket. Sometimes they would tie the two diodes in the 6H6 together or ground out one of them. I noticed they stopped doing this shortly after that scandal erupted about companies like International Kadette marketing so called "ten tube" radios where three or four of the ten were just ballast tubes, the laws were changed after that. 
Regards
Arran