General Electric type PJ-2 pliotron
date: label: date made
content: ca 1925
name: label: maker
content: General Electric Company
notes: label: Description (Brief)
content: A metal 4-pin base with S-shaped envelope, getter stain. Donor’s card reads: “Triode made by the General Electric Company..., made for use in railway signal systems. Apparently dates from the 1920s. From a GE letter of 8 March 1963: PJ-2 developed about 1922 under designation TC-3 for use in block signal apparatus installed in locomotive cabs. Made for Union Switch & Signal Co. of Swissvale, PA, and was first put into locomotives of the Pennsylvania Railroad in 1923 by that company. Later this tube was made at the rate of 500 per month and was also used by General Railway Signal Co. In 1924 it was in use on the Santa Fe, Nickel Plate and the New Haven. Manufacture was discontinued in 1938. .... The PJ-2 is not a thyratron but a pliotron, an industrial triode. Filament: 4.5 volts at 1.1 amperes. Amplification factor 30. 350 volts plate power. Has a 1000 mmfd condenser connected from grid to filament within the base.” See also: https://www.radiomuseum.org/tubes/tube_pj-2.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.324654
label: catalog number
content: 324654
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: 5 1/4 in x 2 in; 13.335 cm x 5.08 cm