De Forest type 503 transmitting triode
date: label: date made
content: ca 1930
name: label: maker
content: De Forest Radio Telephone & Telegraph Co.
notes: label: Description (Brief)
content: A 4-pin (short) brass base shell with ceramic insulator, T-shaped envelope. An air-cooled transmitting triode. Donor’s card reads: “Triode made by De Forest in the 1920s and early 1930s. Electrically similar and interchangeable with the RCA type 203-A tubes [catalog numbers 324511 and 324553]. This is the De Forest version of the popular “fifty watter” of the late 1920s. 10 volt filament, 1000 volts on the plate, for an average output of 50 watts.” See also: https://www.radiomuseum.org/tubes/tube_503.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 Paul G. Watson
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.324626
label: catalog number
content: 324626
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: 7 1/4 in x 2 1/4 in; 18.415 cm x 5.715 cm