Western Electric type 220B transmitting triode
date: label: date made
content: ca 1926
name: label: maker
content: Western Electric
notes: label: Description (Brief)
content: A water-cooled transmitting triode. Glass envelope set on a metal cooling sleeve, contact clips on top with top contact on glass stem. Marked: "Western Electric / Made in U.S.A. / 220-B / Pat. in U.S.A. / 6-26-17 / 2-14-19 / 2-18-19 / 5-13-19 / 1-27-20 / 9-28-20 / 5-5-25 / 5-29-23 / 12-18-23 / 4-23-24 / 5-5-25 / 6-16-25 Two Pats. / Pats. Applied For". Serial number "2731" on envelope, "1344" stamped in base.
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.322621
label: catalog number
content: 322621
label: accession number
content: 241556
objectType: label: Object Name
content: triode
label: Object Name
content: vacuum tube
label: Other Terms
content: Electron Tube; Electron Tubes
physicalDescription: label: Measurements
content: overall: 21 in x 3 1/2 in; 53.34 cm x 8.89 cm