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Marconi Radio Valve Type QX, by Marconi Company, London, c. 1921
Inventory Number: 27778
Number of documents: 2
Document Type: Miscellaneous Note
Document Heading: Technical Details - Marconi Radio Valve Type QX
Text:
The Type Q valve had a number of serious problems including a high value of anode resistance and a difficulty in mass-production and hence, in 1921, their replacement, the Type QX, was introduced. This valve was a redesigned Type Q valve but almost identical in construction and structure to the Type V24 valve. The Type QX valves worked well at lower anode voltages (compared to the Type Q) and proved a better complement to the V24 in (later) receivers using both types.
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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