De Forest experimental radio tube
date: label: date made
content: ca 1917
name: label: maker
content: De Forest Radio Telephone & Telegraph Co.
notes: label: Description (Brief)
content: A candelabra-screw base with skirted shell, plated brass , 2 glass insulators, lead wire insulation emerging from side of envelope. 2 collector plates, one on either side of a flat-wound grid that surrounds a vertically-mounted tungsten filament with spiral vibration absorber. Tipped T-shape envelope. No extant maker's markings. Original record lists this as a De Forest tubular "Audion" tube and the stem structure appears similar to a CF-185, but the base appears similar to a Moorhead E12 tube. Reference: https://www.radiomuseum.org/tubes/tube_moorhead_d_e12.html.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from the United States Bureau of Standards, Dept. of Commerce
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.188571.01
label: accession number
content: 188571
label: catalog number
content: 188571.01
objectType: label: Object Name
content: Electron Tube, Triode
label: Object Name
content: triode
label: Other Terms
content: Electron Tube, Triode; Electron Tubes
physicalDescription: label: Physical Description
content: glass (overall material)
label: Physical Description
content: metal (overall material)
label: Measurements
content: electron tube, triode: 15 cm x 2.5 cm; 5 7/8 in x in
label: Measurements
content: overall: 6 in x 1 1/4 in x 1 in; 15.24 cm x 3.175 cm x 2.54 cm