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(1) Tested Philco 17D4 Tube Code 5839 Sylvania EIA Code Half Wave Rectifier Tube

(1) Tested Philco 17D4 Tube Code 5839 Sylvania EIA Code Half Wave Rectifier Tube

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(1) Tested Philco 17D4 Tube.
Date Code 5839.
The 312 EIA number indicates that this tube was made by Sylvania for Philco.

Tested on a calibrated Hickok TV-10 military tube tester with no shorts at 1525 where 800 is minimum pass/good.

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