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

Inventory Number: 94536

94536-2t 94536-1t

Date: c. 1923

Maker Details: Signed by Marconi Valves.

Inscription: "MARCONI / VALVES / PATENTED / MADE IN ENGLAND / D.E.V. C" printed on exterior surface of bulb.

Size: 70 mm in overall length

Materials: Glass, steel, assorted metals.

Other Given Number(s): Christie's 210.


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. Previously catalogued with assorted other valves.

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