De Forest type VT21 / CF185 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 / CF-185 triode. Nickel-plated brass base with 4 pins, composition insulator, tipped T-shaped glass envelope. Printed on envelope: "Dont Exceed / .85 Amps / De Forest / type CF 185", inked in press: "111", paper label: "DF-VT21". 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
creditLine: label: Credit Line
content: from Susan Horle
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.314064
label: catalog number
content: 314064
label: accession number
content: 195337
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 3/4 in x 1 3/8 in; 9.525 cm x 3.4925 cm