Catalogue
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Osram Radio Valve Type R, by Osram, England, c. 1918
Inventory Number: 80773
Date: c. 1918
Maker Details: Signed by Osram.
Inscription: "OSRAM / MADE IN / ENGLAND" on one side of exterior surface of valve. "R / 249" on other side of exterior surface of valve.
Size: 95 mm in overall height (excluding base pins)
Materials: Glass, tungsten, brass?, steel, assorted metals.
Other Given Number(s): Christie's 198.
Notes:
Osram Triode Radio Valve Type R, example of early Type R; probably produced in late WW1. Made by Osram before the formation of Marconi-Osram Valves in 1919. Cylindrical anode threaded by helical grid within which passes single strand of Tungsten wire as filament. In use filament would burn brightly just like a light bulb. With brass? base and steel base pins. Previously catalogued with three other Type R Radio Valves (Inv. Num.s 94475, 22908, 82041).
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