General Electric type GL-5593 “Phasitron” tube
date: label: date made
content: 1948
name: label: maker
content: General Electric Company
notes: label: Description (Brief)
content: An 11-pin plastic base with center post, T-shaped envelope. Base stamped: “General [GE logo] Electric / GL-5593 / Made in U.S.A.” Donor’s card reads: “Phasitron made by the General Electric Company in 1948. From the WMBR-TV transmitter, Jacksonville, Florida trough the courtesy of Robert Ried, W4TK, Chief Engineer. This is a phase modulator tube for use in frequence modulated radio transmitters. Intended for operation up to 250 kilocycles without any degree of subsequent frequency multiplication. As a modulator the 5593 enables the introduction of comparatively wide phase excursions at audio frequency rates in a crystal controlled carrier. The modulating circuit audio response is such that the tube has a wide swing frequency modulated output. Phase modulation is converted to frequency modulation directly at the tube through the self-induction of the external audio modulating coil. Number of electrodes: 10; cathode indirectly heated, 6.3 volts at .3 ampere; #1 plate voltage 250; #2 plate voltage 300; deflectors #1, 2, and 3 100 volts; deflector #4 100 volts; #1 grid 25 volts; #2 grid 50 volts; cathode current 12 milliamperes.” See also: https://www.radiomuseum.org/tubes/tube_5593.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.324627
label: catalog number
content: 324627
label: accession number
content: 252994
objectType: label: Object Name
content: electron tube
label: Object Name
content: phasitron
label: Other Terms
content: Electron Tube; Electron Tubes
physicalDescription: label: Measurements
content: overall: 4 1/2 in x 2 3/4 in; 11.43 cm x 6.985 cm