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(1) Tested Strong RCA 6JB6A Date Code FO 6JB6 A Beam Power Vacuum Tube

(1) Tested Strong RCA 6JB6A Date Code FO 6JB6 A Beam Power Vacuum Tube

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(1) Tested Strong RCA 6JB6A Tube.
Date Code FO.

The name is partially worn away but still recognizable.

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

Gm Test = 7750 micromhos
Minimum pass/good = 4400

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