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Classic Currents

(1) Tested Philco 7H7 Tube Date Code 6O Loctal Tube Loktal Pentode Tube

(1) Tested Philco 7H7 Tube Date Code 6O Loctal Tube Loktal Pentode Tube

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(1) Tested Strong Philco 7H7 Tube.
Date Code 6O.

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

Gm Test = 4500 micromhos
Minimum pass/good = 2400

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