De Forest type DL2 "Audion" triode
date: label: date made
content: ca 1925
name: label: maker
content: De Forest Radio Telephone & Telegraph Co.
label: Maker
content: Western Union Corporation
notes: label: Description (Brief)
content: De Forest type DL2 "Audion" triode. Ceramic base with 4-pins and makers stamp, tipped T-shaped envelope. Paper testing label reads. "Tested / by dealer [number crossed thru] / tube / Date Sept. 15, 1927 in presence / of [blank] Purchased"; stamped on base: "De Forest / Reg. U.S. Pat. Off. / Audion / Reg. U.S. Pat. Off. / Patented as shown / on carton / Isolantite base".
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Western Union Corporation
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.333068
label: accession number
content: 294351
label: accession number
content: 294351
label: catalog number
content: 333068
objectType: label: Object Name
content: Tube, Electron
label: Object Name
content: vacuum tube
label: Object Name
content: triode
physicalDescription: label: Measurements
content: overall: 4 1/4 in x 1 3/8 in; 10.795 cm x 3.4925 cm