Philips-Mullard type PM4 / B98 triode
date: label: date made
content: ca 1926
name: label: maker
content: Mullard
notes: label: Description (Brief)
content: A four-pin plastic base. Tipless S-shaped envelope with internal getter stain. Stamped on envelope: "B98 / [?????] / for use only / Made in [?????]", on base: "B98". The PM4 marking does not appear on this tube, so the identity is uncertain. Donor card reads: "Triode made by Mullard of England for "Amateur use only." Used as a Class A amplifier; 150 volts at 8 mA on the plate, 15 volt negative grid bias. Filament: 4 volts at .15 ampere. Similar to Tungsram L-414 and Philips B-405 tubes." See also: Tyne, "Saga of the Vacuum Tube," page 377-379.
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.324484
label: catalog number
content: 324484
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 1/4 in x 1 5/8 in; 10.795 cm x 4.1275 cm