Catalogue
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Marconi Radio Valve Type Q, by Ediswan, London, c. 1916
Inventory Number: 33191
Date: c. 1916
Maker Details: Attributed to Ediswan.
Inscription: "MARCONI'S W.T. CO. LTD. / PAT APPN. ______" stamped vertically on exterior surface of bulb. "Q" stamped horizontally on exterior surface of bulb.
Size: 70 mm in overall length
Materials: Glass, steel, assorted metals.
Other Given Number(s): Christie's 197.
Notes:
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 five other valves: Marconi Type V24 Valve (Inv. Num. 35245), Marconi DEV Valve (Inv. Num. 15771), Marconi DEQ Valve (Inv. Num. 74920), Mullard ORA/B Valve (Inv. Num. 18833), Marconi FE2 Valve (Inv. Num. 92775).
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