(1) Tested Strong and Balanced Unbranded 5751 Tube.
Manufacturer unknown, there is only the tube number and an etched date code of NV.
Black plates with a top square getter.
Tested on a calibrated Hickok TV-10 military tube tester with no shorts and no leaks with the following results:
Gm Test = 1750-1750 micromhos
Minimum pass/good = 950-950
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