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Marconi Radio Valve Type Q, by Ediswan, London, c. 1919

Inventory Number: 31396

31396-2t 31396-1t

Date: c. 1919

Maker Details: Attributed to Ediswan.

Inscription: "MARCONI'S W. T. CO. LTD. / PAT. APPN. No. 28413-19. Q" 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 Q, with distinctive wire mesh cage grid. Grid is made of longitudinal wires with interwoven helical wire, all supported on rectangular wire frame. Filament is not clear but is single strand filament running length of valve and tensioned by a spring. With complete filament, and plain metal cylinder anode taken to one of the side connections. Previously catalogued with assorted other valves.

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