De Forest type D400A triode in original box
date: label: date made
content: ca 1925
name: label: maker
content: De Forest Radio Telephone & Telegraph Co.
notes: label: Description (Brief)
content: De Forest type D-400-A "Audion" triode in original box. Ceramic base shell with 4 long pins and maker stamp, tipless S-shape envelope, partly silvered with paper maker label: "De Forest Radio Company / D 400 A". Refers to carton for patents that range between 821637 and 1612440. "10197" stamped on bottom. Instruction sheet included. Reference: Tyne, "Saga of the Vacuum Tube," pages 305-306.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Franklin Wingard
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.323124
label: catalog number
content: 323124
label: accession number
content: 241556
objectType: label: Object Name
content: vacuum tube
label: Object Name
content: electron tube
label: Object Name
content: triode
physicalDescription: label: Measurements
content: tube: 4 1/4 in x 1 3/4 in; 10.795 cm x 4.445 cm
label: Measurements
content: box: 5 1/2 in x 2 1/8 in x 2 1/8 in; 13.97 cm x 5.3975 cm x 5.3975 cm