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Marconi-Osram Radio Valve Type R, by Marconi Company, London, c. 1923
Inventory Number: 85569
Number of documents: 2
Document Type: Miscellaneous Note
Document Heading: Inscription - Inv Num 85569
Text:
"MARCONI OSRAM VALVE / MADE AT THE LAMP WORKS / GOVERNED BY VARIOUS PATENTS" stamped on one side of exterior surface of bulb. "BBC [LOGO] / D.E.R. / 6542" on other side of exterior surface of bulb. "Fil. Volts 1.8-2.0 Fil. Amps 0.4 av. Anode Volts 30 -50 / This Valve has been thoroughly tested before leaving the / Works, and no responsibility can be accepted for Valves / used under conditions other than the above." 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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