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Marconi Radio Valve Type DEV, by Marconi Company, English, c. 1923

Inventory Number 83921

Acknowledgement: © History of Science Museum, University of Oxford, inv.83921

Item type
Object
Provenance
Presented by the Marconi Corporation.
Primary inscriptions
"MARCONI'S W. T. CO. LTD. / MADE IN ENGLAND / COVERED BY VARIOUS PATENTS / D.E.V. / 1430 BBC [LOGO]" printed on exterior surface of bulb.
Object type
Radio valve
Dimensions
Diameter: 30mm Height: 75mm Weight: 0.05kg
Inventory No
83921
Accession Number
2004-9/311

Description

Marconi Radio Valve Type DEV (Dull Emitter V), with grid and anode connections as side pips on envelope, and single strand tungsten filament running entire length with spring for tensioning. Construction was co-axial with helical wire grid surrounding filament and fitting within cylindrical anode. In thin glass envelope half painted red, with envelope caps at either ends. BBC logo ('TYPE APPROVED BY THE POSTMASTER GENERAL') was used from 1st November 1922 until September 1924, and is a good indication of the date of origin. Previously catalogued with assorted other valves.

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