(1) Tested Strong Zenith 6JM6 Tube with Original Box.
Date Code 73-04.
The 188 EIA code indicates that this tube was made by GE for Zenith.
The box has some wear and light staining on it.
Tested on a calibrated Knight KG-600B tube tester with no shorts and no leaks where 50 is minimum pass/good with the following results:
Zenith = 100
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