| 11. | They probably have more vacuum tubes than any agency in the world.
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| 12. | The electronic vacuum tubes invented later around 1906 superseded the Crookes tube.
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| 13. | Also devices with mercury arc rectifiers or vacuum tubes were in use.
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| 14. | This circuit was originally implemented using a pair of vacuum tubes.
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| 15. | An ion detector is analogous to a capacitor or vacuum tube.
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| 16. | It employed a single pentode vacuum tube and could register only twofold coincidences.
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| 17. | Powered by vacuum tubes, those old radar units are now dinosaurs.
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| 18. | In the 1950s, Maestro was a leader in vacuum tube technology.
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| 19. | In fact these early electronics used Vacuum tubes ! # 4.
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| 20. | The second solution used additional electromagnets wrapped around the vacuum tube.
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