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 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". "BS" on base shell. 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
creditLine: label: Credit Line
content: from the US Bureau of Standards
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: ZZ.RSN80536U02
objectType: label: Object Name
content: Electron Tube
label: Object Name
content: triode
label: Other Terms
content: Electron Tube; Electron Tubes
physicalDescription: label: Physical Description
content: composition (overall material)
label: Physical Description
content: metal (overall material)
label: Measurements
content: electron tube: 3 1/2 in x 1 5/8 in; 8.89 cm x 4.064 cm
label: Measurements
content: overall: 3 3/8 in x 1 1/2 in; 8.5725 cm x 3.81 cm