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

Inventory Number 94536

Acknowledgement: © History of Science Museum, University of Oxford, inv.94536

Item type
Object
Provenance
Presented by the Marconi Corporation.
Primary inscriptions
"MARCONI / VALVES / PATENTED / MADE IN ENGLAND / D.E.V. C" printed on exterior surface of bulb.
Object type
Radio valve
Dimensions
Diameter: 25mm Height: 75mm Weight: 50g
Inventory No
94536
Accession Number
2004-9/300

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. Previously catalogued with assorted other valves. Construction was co-axial with helical wire grid surrounding filament and fitting within cylindrical anode. In thin glass envelope half painted red? (this example is orange), with envelope caps at either ends.

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