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I was able to find some date code info on the net. I could only find out what the first two digits of the three digit code stand for. Every tube in both the radio and television chassis, except for one, are RCA branded and coded KE5, XE1, XE2, or XE3. That means 1938, and 1939 OEM for the first two digits, does the last number indicate month? The only exception in the set is the horizontal output tube which is branded National Union. The only coding I can find on that tube is an "F". I don't have a tube tester so I don't know how well used they are, but maybe the set was used so little that the tubes are all original?
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