General Electric type FG-235-A / GL-5552 ignitron
date: label: date made
content: ca 1948
name: label: maker
content: General Electric Company
notes: label: Description (Brief)
content: A large metal cylinder with braided cable emerging from the top, side contact near bottom. Stamped on side: “General [GE logo] Electric / FG-235-A / Made in U.S.A. / 13310 / 19H3”. Donor’s card reads: “Ignitron made by the General Electric Company. Dates from 1950 or before. Generally used in two pairs for AC control service, in which two tubes connected in inverse-parallel will control 1200 kva at voltage 250 to 600 over a frequency range of 25 to 60 cycles. Contained in a stainless steel water jacketed cover, containing mercury vapor in operation, this tube can be controlled by thermostats in the water colling lines. The anode terminal is a large flexible lead at the top, the cathode lead is the heavy lug projecting from the bottom, and the ignitor terminal is the small cap within the bottom skirt of the metal shell.”
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.324973
label: catalog number
content: 324973
label: accession number
content: 252994
objectType: label: Object Name
content: Electron Tube, Triode
label: Object Name
content: ignotron
label: Object Name
content: ignitron
label: Other Terms
content: Electron Tube, Triode; Electron Tubes
physicalDescription: label: Measurements
content: overall: 13 in x 4 3/4 in x 4 in; 33.02 cm x 12.065 cm x 10.16 cm