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Marconi-Osram Radio Valve Type R, by Marconi Company, London, c. 1923
Inventory Number: 22908
Number of documents: 2
Document Type: Miscellaneous Note
Document Heading: Inscription - Inv. Num. 22908
Text:
"R BBC [LOGO]" on other side of the exterior surface of bulb. "Fil. Volts 4.0 Fil. Anode 0.65 av. / This Valve has been throughly tested before leaving / the Works, and no responsibility can be accepted / for Valves under conditions other than the above. / Suitable Anode Volts 45-60" printed on label glued around base.
Document Type: Miscellaneous Note
Document Heading: Manufacturer Details
Text:
Marconi-Osram Valve Co. Ltd. was founded in 1919, and took over the manufacture of Marconi valves from Ediswan, the trade name of the Edison and Swan United Electric Light Company Limited. The M-OV, as it was later known, was a joint Marconi-GEC valve-manufacturing company. It produced all of its valves at the Osram Lamp Works at Hammersmith, London.
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