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  2. Grid-leak detector - Wikipedia

    en.wikipedia.org/wiki/Grid-leak_detector

    A grid leak detector is an electronic circuit that demodulates an amplitude modulated alternating current and amplifies the recovered modulating voltage. The circuit utilizes the non-linear cathode to control grid conduction characteristic and the amplification factor of a vacuum tube. [1] [2] Invented by Lee De Forest around 1912, it was used ...

  3. Vacuum tube - Wikipedia

    en.wikipedia.org/wiki/Vacuum_tube

    A vacuum tube, electron tube, [ 1][ 2][ 3] valve (British usage), or tube (North America) [ 4] is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied. The type known as a thermionic tube or thermionic valve utilizes thermionic emission of electrons from a ...

  4. Vacuum-tube computer - Wikipedia

    en.wikipedia.org/wiki/Vacuum-tube_computer

    A vacuum-tube computer, now termed a first-generation computer, is a computer that uses vacuum tubes for logic circuitry. While the history of mechanical aids to computation goes back centuries, if not millennia, the history of vacuum tube computers is confined to the middle of the 20th century. Lee De Forest invented the triode in 1906.

  5. List of vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_vacuum_tubes

    YD1336 – 1.8 kW, Air-cooled, UHF power triode. YD1342 – 30 MHz, 530 kW, Water-cooled RF power triode. YD1352S (8867, DX334) – 5 MHz, 2 kW, Water-cooled Neotron, a gridless field-effect tube where a magnetically focused electron beam is modulated by varying the voltage of a gate electrode surrounding it.

  6. Valve Amplification Company - Wikipedia

    en.wikipedia.org/wiki/Valve_Amplification_Company

    Valve Amplification Company ( VAC) is a U.S. supplier of high end audio electronics, principally utilizing vacuum tube technology. It was founded in 1990 by Kevin Hayes (b. 1959) and Channing W. Hayes (1923–2009). A Florida corporation, as of 2011 it is located in Sarasota, Florida, U.S.

  7. List of Mullard–Philips vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_Mullard–Philips...

    ECL113 – Triode - AF power pentode, Rimlock base. ECL200 – Triode - CRT drive power pentode, decal base, PCL200 with a different heater. ECL802 – Triode - Power pentode for use as vertical oscillator and output tube in TV receivers. ECL805 – Triode - Power pentode with separate cathodes, PCL805 with a different heater.

  8. 7AK7 - Wikipedia

    en.wikipedia.org/wiki/7AK7

    7AK7. The 7AK7 is a pentode vacuum tube (thermionic valve). According to its manufacturer, Sylvania, it was "designed for service in electronic computers". [ 1] The tube was developed in 1948, [ 2] designed at the request of L. D. Wilson for use in the Whirlwind computer. [ 3] Significant attention was directed towards its manufacturing process ...

  9. Rogers Vacuum Tube Company - Wikipedia

    en.wikipedia.org/wiki/Rogers_Vacuum_Tube_Company

    Rogers Vacuum Tube Company (formally named Radio Manufacturing Corporation Limited) was founded as the Standard Radio Manufacturing Corporation in 1925 by Edward Rogers (1900–1939) to sell Rogers "Batteryless" radios using vacuum tube technology. [1] [2] It was later renamed Rogers Majestic Corporation Limited when Rogers merged his company ...

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