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OK So I'm curious, the big Zenith TV of mine, has all of its original Zenith branded tubes in it and they are all sourced from different companies including Sylvania (Zenith's primary tube source), GE, RCA and several tubes in the IF and Audio section that were sourced oddly enough from Philips-Miniwatt in Holland, I say "oddly enough" for the Philips-Miniwatt sourced tubes in this set because I didn't think Zenith sourced OEM Parts such as tubes from Philips-Miniwatt during that time period in their history, and the reason why I know they are all original tubes and not replacements is because all of the tubes have matching date codes from between late 1963 to early 1964 which was about the time period we had thought this TV dated to possibly.
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