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(1) Tested GE 1L4 Tube with Box Date Code 60-48 General Electric Pentode Tube

(1) Tested GE 1L4 Tube with Box Date Code 60-48 General Electric Pentode Tube

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(1) Tested GE 1L4 Tube with Original Box.
Date Code 60-48.

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

Gm Test = 1075 micromhos
Minimum pass/good = 650

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