Marconi type Q radio valve
date: label: date made
content: ca 1917
name: label: maker
content: Marconi Wireless Telegraph Co. Ltd.
notes: label: Description (Brief)
content: Four metal contacts, one at each end (filament) and one on each side (plate and grid). Cylindrical plate, mesh grid, straight single wire filament. Tipped T-shaped envelope. Envelope stamped: "Marconi's W.T. Co Ltd. / Pat. Appn. No. 28413-13". According to Tyne's "Saga of the Vacuum Tube," (pages 223-224) the Q tube differs from the type V24 through its use of a "fine mesh gauze" through which the filament leads passed. The cyliderical collector also appears to be larger in diameter. This tube exhibits both features.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Susan Horle
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.314094
label: catalog number
content: 314094
label: accession number
content: 195337
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: 3 in x 1 in x 3/4 in; 7.62 cm x 2.54 cm x 1.905 cm