(1) Tested Champion 6D6 Tube.
Date Code C3C.
This tube tests above NOS.
The wording on the base is partially worn and faded but still recognizable.
Tested on a calibrated Hickok TV-10 military tube tester with no shorts and no leaks with the following results:
Gm Test = 1750 micromhos
Minimum pass/good = 1000
Average NOS rating = 1500
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