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(1) Tested GE 6BY6 Tube Date Code 57-48 Pentagrid Amplifier Tube

(1) Tested GE 6BY6 Tube Date Code 57-48 Pentagrid Amplifier Tube

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(1) Tested GE 6BY6 Tube.
Date Code 57-48.

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

Gm Test = 1200-600 micromhos
Minimum pass/good = 750-315

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