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Classic Currents

(1) Tested 1955 Tung Sol 6AC7 Tube Code 540-3 Sharp Cutoff Metal Pentode Tube

(1) Tested 1955 Tung Sol 6AC7 Tube Code 540-3 Sharp Cutoff Metal Pentode Tube

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(1) Tested Tung Sol 6AC7 Tube.
Date Code 540-3 (40th week of 1955).

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

Gm Test = 5750 micromhos
Minimum pass/good = 3800

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