Catalogue
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Marconi Radio Valve Type R, by Marconi Company, England, c. 1916
Inventory Number: 94475
Date: c. 1916
Maker Details: Signed by Marconi's Wireless Telegraph Co. Ltd.
Inscription: "R / 18 892C" on one side of exterior surface of bulb. "MARCONI'S W. T. CO LTD / MADE IN ENGLAND / COVERED BY VARIOUS PATENTS" on other side of exterior surface of bulb.
Size: 110 mm in overall length (excluding base pins)
Materials: Glass, nickel, steel?, tungsten, assorted metals.
Other Given Number(s): Christie's 198.
Notes:
Marconi Triode Radio Valve Type R, with slightly smoked glass, a concentric formation of electrodes, and a single fine strand of tungsten filament. The fragile and brittle filament has been partly protected by a coil formation adjacent to the clearly visible grid support, giving a measure of tension to prevent sag when the filament is at operating temperature. The pin formation suggests a date of production during WW1. With nickel-plated base and four steel? base pins. Previously catalogued with three other Type R Radio Valves (Inv. Num.s 22908, 82041, 80773).
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