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(1) Tested Sylvania 12K5 Tube with Box Code NR ADT Power Tetrode Vacuum Tube

(1) Tested Sylvania 12K5 Tube with Box Code NR ADT Power Tetrode Vacuum Tube

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(1) Tested Sylvania 12K5 Tube with Original Box.
Date Code NR ADT.

Tested on a calibrated Hickok TV-10 military tube tester with no shorts with the following results:

Gm Test = 3050 micromhos
Minimum pass/good = 1900

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