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Classic Currents

(1) Tested 1949 Sylvania 14C7 Tube Date Code 9-39 Loctal Sharp Cutoff Pentode

(1) Tested 1949 Sylvania 14C7 Tube Date Code 9-39 Loctal Sharp Cutoff Pentode

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(1) Tested 1959 Sylvania 14C7 Tube.
Date Code 9-39 (39th week of 1949).

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

Gm Test = 1750 micromhos
Minimum pass/good = 990

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