De Forest type VT21 triode
date: label: date made
content: ca 1918
name: label: maker
content: De Forest Radio Telephone & Telegraph Co.
notes: label: Description (Brief)
content: De Forest type VT-21 radio tube. Nickel-plated brass base with 4 pins, composition insulator, tipped pinched T-shaped glass envelope. Stamped on base shell: "De Forest / type VT 21". "A" etched near one pin. Mild blackening evident on inner tube wall. Reference: Tyne, "Saga of the Vacuum Tube," pages 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.322792
label: catalog number
content: 322792
label: accession number
content: 250988
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 1/2 in x 1 3/8 in; 8.89 cm x 3.4925 cm