RCA history with FM and "stereo" - interim notable here between Armstrong FM patents and Zenith multiplex run-arounds
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Restoring a pair of 1961-2 RCA 3-channel consoles, both have a RC1192C tuner with this 3 position selector(FM/AM/FM-AM), the first two being mono
, "living stereo"
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In the simple days of joint ownership with TV and Newspaper enterprises, with AM and FM studios in the same location, it was easy to broadcast one channel on AM and the other on FM. I imagine those without this feature heard incomplete audio if tuning in only one or the other
