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Record Details 2

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

preview image for Marconi Radio Valve Type DEV, by Marconi Company, English, c. 1923
Inventory Number: 83921
Object Type:
Place Created: England United Kingdom Europe
Accession Number: 2004-9/311
Brief 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.
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.
Provenance: Presented by the Marconi Corporation.
Collection Group: Marconi Collection
Material(s): Glass
steel
assorted metals.
Dimensions:
Height Width Depth Diameter Unit
75 30 mm

Narratives

Image with multimedia irn 39945Image with multimedia irn 39946

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