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(1) Tested Strong RCA 18FX6A Tube with Box Date Code AT Pentagrid Converter Tube

(1) Tested Strong RCA 18FX6A Tube with Box Date Code AT Pentagrid Converter Tube

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(1) Tested Strong RCA 18FX6A Tube with Original Box.
Date Code AT.

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

Gm Test = 1000-6625 micromhos
Minimum pass/good = 600-3600

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