Cosmos model VR-4 (early) radiophone
date: label: date made
content: 1925
name: label: maker
content: Metropolitan Vickers Supplies Ltd.
notes: label: Description (Brief)
content: Marked: paper tag: "Cosmos Radiophone / Type VR-4 / Cat. No. 8999591 / Serial No. 322743"; engraved: "METRO-VICK Supplies, Ltd. / London / Cosmos / Entirely British Manufacture / BBC." Model is a regenerative receiver using three 4 prong triode vacuum tubes. Circuit appears to be a regenerative detector followed by two stages of audio frequency amplification. Feedback is accomplished by varying the capacity of a fixed but movable condenser marked 200-550 meters. Electrostatic coupling to a movable plate provides regeneration control. A Marconi type tuning capacitor provides station selection. Filament rheostat on base. Total structure housed under a circular shell. This is an earlier version of the VR-4, a later version appears substantially different. Reference: https://www.radiomuseum.org/r/metropolit_vr_4.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.321032
label: catalog number
content: 321032
label: accession number
content: 241556
label: catalog number
content: 899591
label: serial number
content: 322743
objectType: label: Object Name
content: radio transceiver
physicalDescription: label: Measurements
content: overall: 9 1/2 in x 9 1/2 in; 24.13 cm x 24.13 cm