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(1) Tested Sylvania 6CU5 with Box Date Code fh ABY Black Plate Power Pentode

(1) Tested Sylvania 6CU5 with Box Date Code fh ABY Black Plate Power Pentode

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(1) Tested Sylvania 6CU5 Tube with Original Box.
Date Code fh ABY. Black plate.

The box shows areas of scuffing.

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

Gm Test = 8375 micromhos
Minimum pass/good = 5650

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