RCA type 2E5 “Radiotron” magic eye tube
date: label: date made
content: ca 1937
name: label: maker
content: Radio Corporation of America
notes: label: Description (Brief)
content: A 6-pin plastic base with top contact, T-shaped envelope. Stamped: “2E5 / L7 / Radiotron / Electron / Tube [RCA logo]”. Donor’s card reads: “Electron ray tube made by the Radio Corporation of America. Glass type used to indicate visually by means of a fluorescent target the effects of a change in controlling voltage. The 2-E-5 is used as a convenient means of indicating the degree of accuracy of radio receiver tuning. Heater type: 2.5 volts at .8 ampere. With 250 volts on the plate and target, a shadow angle of 0 is obtained with 8 volt negative grid, a 90 degree shadow is produced with zero volts on the grid.” See also: https://www.radiomuseum.org/tubes/tube_2e5.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.325240
label: catalog number
content: 325240
label: accession number
content: 252994
objectType: label: Object Name
content: Electron Tube
label: Object Name
content: electron tube
label: Other Terms
content: Electron Tube; Electron Tubes
physicalDescription: label: Measurements
content: overall: 4 in x 1 1/8 in; 10.16 cm x 2.8575 cm