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Classic Currents

(1) Tested 1957 Sylvania 7A4 Tube Code 713 Loctal Tube Medium Mu Triode Tube

(1) Tested 1957 Sylvania 7A4 Tube Code 713 Loctal Tube Medium Mu Triode Tube

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(1) Tested Strong Sylvania 7A4 Loctal Tube.
Date Code 713 (13th week of 1957).

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

Gm Test = 3125 micromhos
Minimum pass/good = 1640

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