Marconi-Osram type T30 transmitting triode
date: label: date made
content: ca 1922
name: label: maker
content: Osram
notes: label: Description (Brief)
content: Markings: "Marconi Valve / Made at / The Osram Lamp Works / Covered by Various Patents / Made in England / T-30 / 312". A transmitting triode with four pins and spiral grid. Reference: Tyne, "Saga of the Vacuum Tube," pages 380-381.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Franklin Wingard
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.322486
label: catalog number
content: 322486
label: accession number
content: 241556
objectType: label: Object Name
content: triode
label: Object Name
content: vacuum tube
physicalDescription: label: Measurements
content: overall: 5 3/4 in x 1 7/8 in; 14.605 cm x 4.7625 cm