Federal Telegraph type F-348-A triode
date: label: date made
content: ca 1936
name: label: maker
content: Federal Telephone & Telegraph Co.
notes: label: Description (Brief)
content: A large glass tube with heat sink on bottom, metal top cap with two braided copper leads, side contact with metal cap. Label: “F-348-A / Federal Tel. Co.” Donor’s card reads: “Triode made by the Federal Telegraph Co. of California and of Clifton NJ. Water cooled, intended for use as a modulator in AM broadcasting, may be used in radio frequency service up to 1600 kilocycles. From WJJD Chicago about 1937. Tungsten filament: 22 volts at 52 amperes, single phase. For Class B modulator or audio amplifier service, 15000 volts at 1 ampere on the plate, for an output of about 7 kw of audio power.”
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.324765
label: catalog number
content: 324765
label: accession number
content: 252994
objectType: label: Object Name
content: Electron Tube, Triode
label: Object Name
content: triode
label: Other Terms
content: Electron Tube, Triode; Electron Tubes
physicalDescription: label: Measurements
content: overall: 19 1/2 in x 7 in x 4 in; 49.53 cm x 17.78 cm x 10.16 cm