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Classic Currents

(1) Tested RCA 12SF5 Tube Date Code 4-22 RCA 12SF5 High Mu Triode Vacuum Tube

(1) Tested RCA 12SF5 Tube Date Code 4-22 RCA 12SF5 High Mu Triode Vacuum Tube

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(1) Tested RCA 12SF5 Tube.
Date Code 4-22.

There are various areas of paint loss and surface pitting - see photo 3.

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 = 950

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