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The complex history behind the electron or vacuum tube. ... In 1904, John Ambrose Fleming invented the first practical electron tube called the 'Fleming Valve'. Leming invents the vacuum tube diode. ... In 1921, American Albert Hull invented the magnetron electronic vacuum tube.
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inventors.about.com/od/uvstartinventions/a/Vacuum_tube....
inventors.about.com/od/uvstartinventions/a/Vacuum_tube.htm
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The vacuum tube didn't reach its full maturity until Lee De Forest came along a decade later. De Forest invented something he called the "audion." Not only did it force current to move in a single direction, but it could be used to increase the current along the way.
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www.pbs.org/transistor/science/events/vacuumt.html
www.pbs.org/transistor/science/events/vacuumt.html
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Vacuum tube - Wikipedia, the free encyclopedia
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In electronics, a vacuum tube , electron tube (in North America), thermionic valve , or valve (elsewhere, especially in Britain) is a device used to amplify, switch, otherwise modify, or creat...
en.wikipedia.org/wiki/Vacuum_tube
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In 1919 he invented the first multiple grid vacuum tube, the tetrode. Schottky obtained multiple doctoral degrees, taught at universities from 1920 to 1927, and then worked for Siemans for nearly five decades.
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www.ece.umd.edu/~taylor/Electrons3.htm
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The Vacuum Tube Era ; (1905 — 1948) ... The magnetron, a vacuum tube whose electron current is controled by a magnetic field, was invented by Albert W. Hull in 1920. ;
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www.hbci.com/~wenonah/history/edpart4.htm
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De Forest, who invented the vacuum tube and held over 300 patents, was the son of a president of Talladega College.
http://en.wikipedia.org/wiki/UN/LOCODE%3AUSASN
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William D. Coolidge invented the Vacuum Tube. ... Invented the Vacuum Tube Patent No. 1,203,495. ... His X-ray tube-popularly called the 'Coolidge tube', completely revolutionized the generation of X-rays and remains to this day the model upon which all X-ray tubes for medical applications are patterned.
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www.bkfk.com/inventor/coolidge-william.asp
www.bkfk.com/inventor/coolidge-william.asp
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Lee De Forest invented the Audion vacuum tube in 1906 which made long-distance wireless radio possible in the years to follow. ... Lee De Forest invented the Audion vacuum tube in 1906, which went on to become the most significant electronics innovation of the first half of the 20th century after its application to radio...
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www.cedmagic.com/history/deforest-audion.html
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The first transistor was invented at Bell Laboratories on December 16, ... Prior to the transistor the only alternative to its current regulation and switching functions (TRANSfer resISTOR) was the vacuum tube, which could only be miniaturized to a certain extent, and wasted a lot of energy in the form of heat.
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www.cedmagic.com/history/transistor-1947.html
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