De Forest type VT21 triode
date: label: date made
content: ca 1917
name: label: maker
content: De Forest Radio Telephone & Telegraph Co.
notes: label: Description (Brief)
content: De Forest type VT-21 triode, nickel-plated brass base shell with plastic insulator, 4 pins, tipped glass envelope with pinched shape. Stamped on base: "De Forest / Type VT-21". "*" written on envelope. References: Tyne, "Saga of the Vacuum Tube," 120-122; https://www.radiomuseum.org/tubes/tube_vt-21.html.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.320380
label: catalog number
content: 320380
label: accession number
content: 242605
objectType: label: Object Name
content: Electron Tube
label: Object Name
content: vacuum tube
label: Object Name
content: triode
label: Other Terms
content: Electron Tube; Electron Tubes
physicalDescription: label: Measurements
content: overall: 3 5/8 in x 1 3/8 in; 9.2075 cm x 3.4925 cm