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Marconi Radio Valve Type V24, by Marconi Company, England, c. 1925

Inventory Number: 25470

25470-2t 25470-1t

Date: c. 1925

Maker Details: Signed by Marconi Valves.

Inscription: "MARCONI / VALVE / PATENTED / MADE IN ENGLAND / V.24 BBC [LOGO] / Z5350" printed on exterior surface of bulb.

Size: 70 mm in overall length

Materials: Glass, steel, assorted metals.

Other Given Number(s): Christie's 209.


Marconi Radio Valve Type V24, in thin glass envelope with caps at either ends, with grid and anode connections as envelope side pips, and single strand tungsten filament running entire length with a spring for tensioning. Construction was co-axial with helical wire grid surrounding filament and fitting within cylindrical anode. In this valve, 'U' shaped glass support holds two stout wire rods that attach to anode and grid respectively; thus electrodes are only supported at one end. BBC Logo ("ENTIRELY BRITISH MANUFACTURE") was used between September 1924 and 1927 and is a good indication of the date of origin. Previously catalogued with assorted other valves.

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