Air Ministry type MH41 / VR505 vacuum triode
date: label: date made
content: ca 1935
label: date made
content: ca 1935
label: date made
content: ca 1935
notes: label: Description (Brief)
content: British type MH-41 / VR-505 vacuum triode, audio frequency. A 5-pin plastic base with tipless domed envelope, upper half having an internal gray coating. Stamped on tube: "[crown logo] / A.M. / ZOKJ" and "Made & Patented in England / MH41 / 1 / 3", and "V.R.505 / 10E/388". Note: the 10E/388 marking is clear. The tube is not marked 10E/631. AM is for Air Ministry. Reference: https://www.radiomuseum.org/tubes/tube_vr505.html and https://www.radiomuseum.org/tubes/tube_mh41.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 Franklin Wingard
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.321041
label: catalog number
content: 321041
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: 4 3/8 in x 1 3/4 in; 11.1125 cm x 4.445 cm