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(1) Tested Western Union 6SJ7 Tube Date Code 6622 RCA EIA Pentode Vacuum Tube

(1) Tested Western Union 6SJ7 Tube Date Code 6622 RCA EIA Pentode Vacuum Tube

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(1) Tested Western Union 6SJ7 Tube.
Date Code 6622.
The 274 EIA code indicates that this tube was made by RCA for Western Union.

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

Gm Test = 1750 micromhos
Minimum pass/good = 1040

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