National Union type NU-403 "heater" triode
date: label: date made
content: ca 1930
name: label: maker
content: National Union Radio Corp.
notes: label: Description (Brief)
content: A double-ended tube with a plastic 4-pin base and a 2-pin plastic top cap. T-shaped envelope. Stamped: "403" and "5159". Donor's card reads: "Triode made by National Union Radio Corporation, 350 Scotland Road, Orange, N.J. in the late 1920s. A copy of the original McCullough AC operated heater type tubes to convert battery operated radio receivers to AC operation. Mounted on a conventional UX long pin base it has the plate and grid connected to the same pins used in battery operation, and the cathode connected to one of the filament pins to complete the triode connection. The AC heater current is connected to the two pins on the top cap, through a wiring harness that ran from tube to tube. Physically somewhat similar to [catalog numbers 324394 and 35439]."
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.324396
label: catalog number
content: 324396
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 1 5/8 in; 13.335 cm x 4.1275 cm