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(1) Tested Very Strong RCA 12SA7 Tube with Box Date Code NR Converter Tube

(1) Tested Very Strong RCA 12SA7 Tube with Box Date Code NR Converter Tube

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(1) Tested Very Strong RCA 12SA7 Tube with Original Box.
Date Code NR.

Box shows various ares of scuffing.

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

Gm Test = 975-1050 micromhos
Minimum pass/good = 470-470

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