Catalogue
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Marconi-Osram Radio Valve Type R, by Marconi Company, London, c. 1923
Inventory Number: 22908
Date: c. 1923
Maker Details: Signed by Marconi-Osram Valve Co. Ltd.
Inscription: "MARCONI OSRAM VALVE / MADE AT THE LAMP WORKS / COVERED BY VARIOUS PATENTS" printed on one side of the exterior surface of bulb. See Documents for other inscriptions.
Size: 110 mm in total length (including base pins)
Materials: Glass, phosphorous, nickel?, plastic?, steel, assorted metals
Other Given Number(s): Christie's 198.
Notes:
Marconi-Osram Radio Valve Type R, made by Marconi-Osram Valve Co. for the domestic radio market and dating from the early era of broadcasting in the 1920s. This valve is unusual for an R type in that the electrode assembly is held vertically, with neat and minimal supports. The glass envelope is partially silvered inside, and the valve itself is gettered. The filament is single thread and is spring loaded. The grid is a bright wire helix fixed to single vertical rod support. The anode is a bright cylinder fixed to the pinch by a single stout support. With nickel-plated plastic? base and brass? base pins. Previously catalogued with three other Type R Radio Valves (Inv. Num.s 94475, 82041, 80773).
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