I would guess the tube was nearing market during the Korean War. I know the early to mid-1950s is the time frame for the T-368 transmitter, specified with a 4-400 in the final. I have a 1957 Crosley T-368C that came with an old red script Eimac 4-400, JAN-type. The T-368 was the successor to the BC-610, so maybe some military historians on here know the development chronology. --Paul/VJB
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