Mullard type PM4DX vacuum triode from SS Fort Royal
date: label: date made
content: 1941
name: label: maker
content: Mullard
notes: label: Description (Brief)
content: A 4-pin plastic base, banana pins, with tipless S-shaped envelope. Paper label reads: “S.S. Fort Royal / French 2-1942”. Stamped on top: "BVA / Protected by Patents / Mullard / PM4DX / DB". Donor’s card reads: “Triode of French origin, from the French ship Fort Royal in February 1942 at the time of the vessel’s seizure by the US government for use in World War II. A general purpose tube used in all the positions of a commercial receiver. Filament: 5 volts, plate circuit as used, 90 volts.” Reference: https://www.radiomuseum.org/tubes/tube_pm4dx.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.324505
label: catalog number
content: 324505
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: 4 in x 1 3/4 in; 10.16 cm x 4.445 cm