The first prototype Fleming valves, built October 1904.Early commercial Fleming valves used in radio receivers, 1919Fleming valve schematic from US Patent 803,684.
The Fleming valve, also called the Fleming oscillation valve, was a thermionic valve or vacuum tube invented in 1904 by English physicist John Ambrose Fleming as a detector for early radio receivers used in electromagnetic wireless telegraphy. It was the first practical vacuum tube and the first thermionic diode, a vacuum tube whose purpose is to conduct current in one direction and block current flowing in the opposite direction. The thermionic diode was later widely used as a rectifier — a device that converts alternating current (AC) into direct current (DC) — in the power supplies of a wide range of electronic devices, until beginning to be replaced by the selenium rectifier in the early 1930s and almost completely replaced by the semiconductor diode in the 1960s. The Fleming valve was the forerunner of all vacuum tubes, which dominated electronics for 50 years. The IEEE has described it as "one of the most important developments in the history of electronics",[1] and it is on the List of IEEE Milestones for electrical engineering.
^"Milestones:Fleming Valve, 1904". IEEE Global History Network. IEEE. Retrieved 29 July 2011.
The Flemingvalve, also called the Fleming oscillation valve, was a thermionic valve or vacuum tube invented in 1904 by English physicist John Ambrose...
tube. The simplest vacuum tube, the diode (i.e. Flemingvalve), was invented in 1904 by John Ambrose Fleming. It contains only a heated electron-emitting...
Ambrose Fleming FRS (29 November 1849 – 18 April 1945) was an English electrical engineer and physicist who invented the first thermionic valve or vacuum...
developed as a radio receiver detector by adding a grid electrode to the Flemingvalve, it found little use until its amplifying ability was recognized around...
partial vacuum tube that added a grid electrode to the thermionic diode (Flemingvalve), the triode was the first practical electronic amplifier and the ancestor...
added a grid to the Flemingvalve (thermionic diode) to create the first amplifying vacuum tube, the Audion (triode). In a valve, the hot cathode emits...
effect could be used as a radio detector. Fleming patented the first true thermionic diode, the Flemingvalve, in Britain on 16 November 1904 (followed...
alternator transmitter. Thermionic diode (Flemingvalve) - The first vacuum tube, invented in 1904 by John Ambrose Fleming, consisted of an evacuated glass bulb...
A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to...
replaced relays for logic operations. Lee De Forest's modification of the Flemingvalve in 1907 could be used as an AND gate. Ludwig Wittgenstein introduced...
physicist John Ambrose Fleming invented the two-electrode vacuum-tube rectifier, which he called the Fleming oscillation valve. for which he obtained...
for logic operations. Lee De Forest's modification, in 1907, of the Flemingvalve can be used as a logic gate. Ludwig Wittgenstein introduced a version...
thermionic vacuum tube diode, originally called the Flemingvalve, was invented by John Ambrose Fleming in 1904 as a detector for radio waves in radio receivers...
processing unit [...] which is a fraction of the blade's CPU. Fifield, Tom; Fleming, Diane; Gentle, Anne; Hochstein, Lorin; Proulx, Jonathan; Toews, Everett;...
multilayer valve stack called a quadruple valve. Three such stacks are typically mounted on the floor or hung from the ceiling of the valve hall of a long-distance...
Center (249) Klystron Gallery Pictures Klystron collection in the Virtual Valve Museum Archived 2010-10-06 at the Wayback Machine Klystron Amplifier "Microwave...
incorporated. The thermionic valve (a kind of vacuum tube) was invented in 1904 by the English physicist John Ambrose Fleming. He developed a device he called...
tried in repeaters, with little success. The development of thermionic valves which began around 1902, provided an entirely electronic method of amplifying...
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