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(1) Tested Raytheon 6S4A Tube with Box Japan Code M14 Medium Mu Triode Tube

(1) Tested Raytheon 6S4A Tube with Box Japan Code M14 Medium Mu Triode Tube

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$9.95 USD
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(1) Tested Raytheon 6S4A Tube with original Box.
Date Code M14. Made in Japan.

This tube tests well above NOS ratings.

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

Gm Test = 4875 micromhos
Minimum pass/good = 2600
Average NOS rating = 3900

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