French "Metos" triode
date: label: date made
content: 1919
notes: label: Description (Brief)
content: A brass 4-pin (long) base with tipped PS-shaped envelope, horizontal element. Stamped: "Metal". Donor's card reads: "Triode, of French origin, bearing the name "Metal" stamped on the envelope. Has some mechanical variation from [catalog number 324334].
label: Description (Brief)
content: The donor also noted: "[I] purchased [this] in Bordeaux in 1919. The general purpose type in Europe of the World War 1 period. Generally considered a "hard" (high vacuum) tube, it was a very satisfactory detector, amplifier, and oscillator. Filament is high temperature, tungsten wire, 5 volts at about 1 ampere. ...
label: Description (Brief)
content: About 1915 and thereafter, General [Gustave-Auguste Ferrié (1868–1932)] of the French Telegraphie Militaire and his assistants worked on the development of a triode for general radio receiving purposes. They developed before World War 1 the "Metos" models [and] the British army "R" tube which became widely used in Europe after the war. ... Further, [several] German army tubes of WWI show the same horizontal element design as the French, however, the German tubes are have plates smaller in diameter and shorter in length. It is definitely known that Lee De Forest was aware of this work in France, and cooperated with General Ferrié before WWI." See catalog number 324329.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Paul G. Watson
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.324335
label: catalog number
content: 324335
label: accession number
content: 252994
objectType: label: Object Name
content: Electron Tube, Triode
label: Object Name
content: triode
label: Other Terms
content: Electron Tube, Triode; Electron Tubes
physicalDescription: label: Measurements
content: overall: 4 1/2 in x 2 1/8 in; 11.43 cm x 5.3975 cm