RCA type 898 "Radiotron Skyscraper" transmitting power triode
date: label: date made
content: ca 1935
name: label: maker
content: RCA Corporation
notes: label: Description (Brief)
content: A large glass tube with long copper heat sink on bottom, top cap with two braided leads, and a glass stem with braded lead on each side. Printed on collar: "RCA Radiotron 898" and "11079". In a wooden shipping crate. Donor’s card reads: “Power triode made by the Radio Corporation of America in the early 1930s. From station KYW (now WRCV) at Whitemarsh, PA. Used as a Class B modulator (in push-pull) to control the output of two type UV-862 tubes. Tungsten filament divides into three sections, each requiring 70 amperes at 33 volts, or a total filament current of 210 amperes at 33 volts. The output of two tubes in push-pull Class B modulator service: 12000 volts on the plate, zero signal current 2 amperes, maximum signal current 12 amperes. Negative grid bias 100 volts, driving power for full output 6 kw. Maximum audio output for two tubes, 90 kw.” See also: https://www.radiomuseum.org/tubes/tube_898.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.325319
label: catalog number
content: 325319
label: accession number
content: 252994
label: model number
content: 898
objectType: label: Object Name
content: Electron Tube
label: Object Name
content: radio tube
label: Object Name
content: triode
label: Other Terms
content: Electron Tube; Electron Tubes
physicalDescription: label: Measurements
content: overall: 61 in x 15 in x 7 in; 154.94 cm x 38.1 cm x 17.78 cm