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(1) Tested Sylvania 6CU8 Tube and Box Code NR DDZ Triode Pentode Vacuum Tube

(1) Tested Sylvania 6CU8 Tube and Box Code NR DDZ Triode Pentode Vacuum Tube

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(1) Tested Sylvania 6CU8 Tube with Original Box.
Date Code NR DDZ.

This tube tests well above NOS.

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

Gm Test = 7000-4450 micromhos
Minimum pass/good = 3900-2100
Average NOS rating = 5850-3150

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