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  2. Ignitron - Wikipedia

    en.wikipedia.org/wiki/Ignitron

    An ignitron is a type of gas-filled tube used as a controlled rectifier and dating from the 1930s. Invented by Joseph Slepian while employed by Westinghouse, Westinghouse was the original manufacturer and owned trademark rights to the name "Ignitron". Ignitrons are closely related to mercury-arc valves but differ

  3. List of vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_vacuum_tubes

    This is a list of vacuum tubes or thermionic valves, and low-pressure gas-filled tubes, or discharge tubes. Before the advent of semiconductor devices, thousands of tube types were used in consumer electronics. Many industrial, military or otherwise professional tubes were also produced.

  4. Thyratron - Wikipedia

    en.wikipedia.org/wiki/Thyratron

    Unlike a vacuum tube (valve), a thyratron cannot be used to amplify signals linearly. In the 1920s, thyratrons were derived from early vacuum tubes such as the UV-200, which contained a small amount of argon gas to increase its sensitivity as a radio signal detector, and the German LRS relay tube, which also contained argon gas.

  5. Mercury-arc valve - Wikipedia

    en.wikipedia.org/wiki/Mercury-arc_valve

    Mercury rectifier on display in the Beromünster AM transmitter in Switzerland, before being decommissioned.Three-phase full-wave rectifier with six anodes. A mercury-arc valve or mercury-vapor rectifier or (UK) mercury-arc rectifier [1] [2] is a type of electrical rectifier used for converting high-voltage or high-current alternating current (AC) into direct current (DC).

  6. Magic eye tube - Wikipedia

    en.wikipedia.org/wiki/Magic_eye_tube

    The magic eye tube (or valve) for tuning radio receivers was invented in 1932 by Allen B. DuMont (who spent most of the 1930s improving the lifetime of cathode ray tubes, and ultimately formed the DuMont Television Network). [5] [6] [7] The RCA 6E5 from 1935 was the first commercial tube. [8] [9]

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  8. Pentode - Wikipedia

    en.wikipedia.org/wiki/Pentode

    The term most commonly applies to a three-grid amplifying vacuum tube or thermionic valve that was invented by Gilles Holst and Bernhard D.H. Tellegen in 1926. [1] The pentode (called a triple-grid amplifier in some literature [ 2 ] ) was developed from the screen-grid tube or shield-grid tube (a type of tetrode tube) by the addition of a grid ...

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