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