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(1) Tested RCA 6S4A Tube with Box Date Code K9 Medium Mu Triode Vacuum Tube

(1) Tested RCA 6S4A Tube with Box Date Code K9 Medium Mu Triode Vacuum Tube

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(1) Tested RCA 6S4A Tube with original Box.
Date Code K9.

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

Gm Test = 4450 micromhos
Minimum pass/good = 2600

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