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, tipped T-shaped glass envelope. Donor card reads: "Triode, made by De Forest. An experimental model preceding the production type made for the US government in World War 1. Probably dates from about 1917. A "hard" (high vacuum) tube, not particularly good as a detector but an excellent audio frequency amplifier. Filament, 5 volts at 1 ampere."
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Paul G. Watson
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.324318
label: catalog number
content: 324318
label: accession number
content: 252994
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 1/2 in; 8.89 cm x 3.81 cm