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(1) Tested CBS 7Y4 Tube with Box Code DD Loctal Tube Rectifier Vacuum Tube

(1) Tested CBS 7Y4 Tube with Box Code DD Loctal Tube Rectifier Vacuum Tube

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(1) Tested CBS 7Y4 Loctal Tube with Original Box.
Date Code DD.

The wording is partially worn off of the glass but still recognizable as being CBS branded.

Tested on a calibrated Hickok TV-10 military tube tester and exhibiting no shorts at 1350-1325 where 800-800 is minimum pass/good.

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