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(1) Tested Philco 5U4GB Tube Black Ribbed Plates Square Halo Getter Code 55-07

(1) Tested Philco 5U4GB Tube Black Ribbed Plates Square Halo Getter Code 55-07

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(1) Tested Strong Philco 5U4GB Tube.
Date Code 55-07.
The 312 EIA code indicates that this tube was made by Sylvania for Philco.
Black ribbed plates with a top square D halo getter.

Some surface scratching on the base.

Tested on a calibrated Hickok TV-10 military tube tester with no shorts at 1350-1300 where 800-800 is minimum pass/good.

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