Sylvania 5U4G Black Plate Bottom Getter Hanging Filament Rectifier Vacuum Tube Made in USA. Some white mica flakes are inside glass, which does not affect tube performance. Desirable Hanging Filament version. Fully tested by calibrated Hickok 539C tube tester with no shorts, leakage or gas. Measurement: 96/92 where minimum good value is 54 I will gladly combine shipping upon request. |
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