Raytheon type RK-21 half-wave vacuum rectifier
date: label: date made
content: ca 1943
name: label: maker
content: Raytheon Manufacturing Co.
notes: label: Description (Brief)
content: A 4-pin plastic base with top contact, S-shaped envelope. Donor’s card reads: “Diode rectifier made by the Raytheon Mfg. Co. during World War II. Heater type with two cathodes, 2.5 volts at 5 amperes. Used in the power supply of radio transmitters and in industrial equipment. Identical and interchangeable with the type 836 tube [catalog number 324647]. 5000 volts peak inverse anode voltage, maximum D current 300 milliamps.” See also: https://www.radiomuseum.org/tubes/tube_rk21.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.324833
label: catalog number
content: 324833
label: accession number
content: 252994
objectType: label: Object Name
content: Electron Tube, Diode
label: Object Name
content: rectifier
label: Other Terms
content: Electron Tube, Diode; Electron Tubes
physicalDescription: label: Measurements
content: overall: 6 1/2 in x 2 1/4 in; 16.51 cm x 5.715 cm