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2. 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.

3. 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.

4. Triode - Wikipedia

   en.wikipedia.org/wiki/Triode

   A triode is an electronic amplifying vacuum tube (or thermionic valve in British English) consisting of three electrodes inside an evacuated glass envelope: a heated filament or cathode, a grid, and a plate ( anode ). Developed from Lee De Forest 's 1906 Audion, a partial vacuum tube that added a grid electrode to the thermionic diode ( Fleming ...

5. 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 ...

6. Lee de Forest - Wikipedia

   en.wikipedia.org/wiki/Lee_de_Forest

   Lee de Forest (August 26, 1873 – June 30, 1961) was an American inventor, electrical engineer and an early pioneer in electronics of fundamental importance. He invented the first practical electronic amplifier , the three-element "Audion" triode vacuum tube in 1906. This helped start the Electronic Age, and enabled the development of the ...

7. Vintage amateur radio - Wikipedia

   en.wikipedia.org/wiki/Vintage_amateur_radio

   Vintage amateur radio is a subset of amateur radio hobby where enthusiasts collect, restore, preserve, build, and operate amateur radio equipment from bygone years, such as those using vacuum tube technology. Popular modes of operation include speaking over amplitude modulation (AM), and communicating using Morse code through continuous wave ...