Quote:
Originally Posted by M3-SRT8
It appears completely original.
The Tuner tubes are dated 3-43. The earliest 1946 tubes are dated 6-17. The 5U4 is missing.
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RCA changed to a year-week code in 1946 so 6-17 is 17th week of 1946, if there is a dash it's an OEM tube, no dash it's a replacement tube.
Before that the code was a letter (Year) number (Month pair) combination, U=1937, F=1946; 1=Jan/Feb, 6=Nov/Dec, so 3-43 isn't an RCA date code.
In 1956 they changed again to the RMA-EIA code format YY-WW.
Chuck