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(1) Tested Silvertone 6D6 Tube Date Code 56X Engraved Base Pentode Tube

(1) Tested Silvertone 6D6 Tube Date Code 56X Engraved Base Pentode Tube

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(1) Tested Silvertone 6D6 Engraved Base Tube.
Date Code 56X.

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

Gm Test = 1800 micromhos
Minimum pass/good = 1000

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