(1) Tested Philco Type 41 Engraved Base Tube.
Date Code 6S.
This tube tests as NOS.
Tested on a calibrated Hickok TV-10 military tube tester and exhibiting no shorts or leaks with the following results:
Gm Test = 1725 micromhos
Minimum pass/good = 1000
NOS rating = 1500
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