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(1) Tested Philco 6AU6 Tube Date Code 247 Philco 6AU6 Sharp Cut Off Pentode

(1) Tested Philco 6AU6 Tube Date Code 247 Philco 6AU6 Sharp Cut Off Pentode

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(1) Tested Philco 6AU6 Tube.
Date Code 247.
The 312 EIA code indicates that tube was made by Sylvania for Philco.

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

Gm Test = 3250 micromhos
Minimum pass/good = 2050

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