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(1) Tested Philco 6AF4 Tube Date Code 57-52 Medium Mu Triode Tube Sylvania EIA

(1) Tested Philco 6AF4 Tube Date Code 57-52 Medium Mu Triode Tube Sylvania EIA

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(1) Tested Philco 6AF4 Tube.
Date Code 57-52.
The 312 EIA code indicates that this 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 = 3750 micromhos
Minimum pass/good = 2840

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