| 1. | Air-traffic control equipment under repair contained TO-3 transistors instead of thermionic valves.
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| 2. | The "'EL34 "'is a thermionic valve or vacuum tube of the power pentode type.
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| 3. | The thermionic valve was invented in 1904 by the English physicist John Ambrose Fleming.
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| 4. | The Tommy Flowers-built thermionic valves ( vacuum tubes ) and binary representation of numbers.
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| 5. | ENIAC was, like the thermionic valves ( vacuum tubes ).
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| 6. | It was also called a thermionic valve, vacuum diode, kenotron, thermionic tube, or Fleming valve.
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| 7. | The war increased demand for such instruments and the War Office needed experimental thermionic valves.
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| 8. | In 1916 Ediswan set up the UK's first radio thermionic valve factory at Ponders End.
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| 9. | Valve electrometers use a specialized vacuum tube ( thermionic valve ) with a very high plate ) circuit.
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| 10. | "' Electronics "'is the study and use of electrically charged particles in devices such as thermionic valves and semiconductors.
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