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(1) Tested Philco Type 24A Tube Engraved Base Date Code U6 24 A Tube Tetrode

(1) Tested Philco Type 24A Tube Engraved Base Date Code U6 24 A Tube Tetrode

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(1) Tested Strong Philco Type 24A Engraved Base Tube.
Date Code U6.

One small horizontal deep scratch located to the above right of the letter "O" in Philco.

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

Gm Test = 1200 micromhos
Minimum pass/good = 630

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