Philips-Mullard type PM4 triode
date: label: date made
content: 1926
name: label: maker
content: Mullard
notes: label: Description (Brief)
content: Markings: on envelope: "Mullard Valve / Patent / Italy" and on paper label, "This valve has been carefully tested and no claims / for replacement will be entertained for valves used / under conditions other than those specified below. / Max. Fil. Volts 4.0 Fil. Ct. 0.1 Amp. / Max. Anode Volts 125 v. / P.M.4 / There is practically no glow from this filament". A triode with four-pin plastic base. Banana pins. Tipless S-shaped envelope with internal getter stain. Unit is not in the original box. Box is for an "Ever Ready Gaslighter Battery / U.14 / Price 2/6 / A product of the Ever Ready Co., Great Britain, Ltd." Reference: Tyne, "Saga of the Vacuum Tube," pages 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 Franklin Wingard
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.322488
label: catalog number
content: 322488
label: accession number
content: 241556
objectType: label: Object Name
content: Electron Tube
label: Object Name
content: triode
physicalDescription: label: Physical Description
content: cardboard (box material)
label: Measurements
content: tube: 4 1/4 in x 1 5/8 in; 10.795 cm x 4.1275 cm
label: Measurements
content: box: 4 3/8 in x 2 in x 2 in; 11.1125 cm x 5.08 cm x 5.08 cm