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(1) Tested Delco 6N7 Tube Date Code 213 Medium Mu Twin Power Triode Tube

(1) Tested Delco 6N7 Tube Date Code 213 Medium Mu Twin Power Triode Tube

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(1) Tested Delco 6N7 Tube.
Date Code 213.
The 274 EIA code indicates that this tube was made by RCA for Delco.

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

Gm Test = 1575-1600 micromhos
Minimum pass/good = 950-950

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