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(1) Tested Very Strong RCA 12SA7 Tube Date Code JBR Converter Tube

(1) Tested Very Strong RCA 12SA7 Tube Date Code JBR Converter Tube

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(1) Tested Very Strong RCA 12SA7 Tube.
Date Code JBR.

Very minor paint loss in one spot on the top rim.

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

Gm Test = 900-950 micromhos
Minimum pass/good = 470-470

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