Cathode Ray Tube for Television
date: label: date made
content: ca 1940
name: label: maker
content: DuMont Company
notes: label: Description (Brief)
content: RCA demonstrated electronic television at the 1939 World’s Fair and other manufacturers quickly began to develop products. Allen B. Dumont Laboratories already produced one of the main components, cathode ray tubes or CRTs. Dumont made these tubes for oscilloscopes but understood they would also serve as picture tubes. This tube has a 3.5 inch face with a white phosphor. The clear envelope allows one to see the electron gun mechanism that produces the stream of cathode rays.
label: Description (Brief)
content: Marked: "149" inked on press. Stamped with Dumont maker's stamp and "Globe Television and Phone Corp." Paper label handwritten: "Fil. Current 5.6A Med[?] Elect. -20V Accel. Elect. +840V Accel. Current 250 microamps" Fil = filament, accel = accellerator. Dumont provided tubes for its own sets and for other manufacturers like Globe Television and Phone Corp. of Boston. Globe made mechanical television sets in the early 1930s and presumably was moving into electronic television.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
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content: Communications
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content: American Enterprise
creditLine: label: Credit Line
content: from Fairchild Camera and Instrument Corporation, Dumont Laboratories Div., thru Edgar S. Hill
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.328322
label: catalog number
content: 328322
label: accession number
content: 270517
objectType: label: Object Name
content: cathode ray tube
label: Object Name
content: television picture tube
physicalDescription: label: Physical Description
content: glass (overall material)
label: Physical Description
content: metal (overall material)
label: Physical Description
content: plastic (overall material)
label: Measurements
content: overall: 12 in x 3 1/2 in; 30.48 cm x 8.89 cm