Federal Telegraph type F-357-A half-wave mercury vapor rectifier
date: label: date made
content: ca 1932
name: label: maker
content: Federal Telephone & Telegraph Co.
notes: label: Description (Brief)
content: A large G-shaped glass tube with two ceramic-bead insulated leads emerging from the bottom, metal top cap, slivered. Paper label: “F-357-A / Federal Tel Co.”. Donor’s card reads: “Half-wave mercury vapor rectifier made by the Federal Telegraph Company. This tube comes from the power supply of the 100 KW WCAU AM transmitter at Newtown Square in 1938, and dates from the early 1930s. Designed for multiple/series polyphase operation to provide high voltage, heavy current plate power for broadcasting. Filament: 5 volts at 30 amperes. Maximum DC voltage from the anode 7000, maximum DC current 10 amperes.” See also: https://www.radiomuseum.org/tubes/tube_f363a.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.324819
label: catalog number
content: 324819
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: 20 in x 6 1/2 in; 50.8 cm x 16.51 cm