Grace's Guide

British Industrial History

Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,470 pages of information and 233,895 images on early companies, their products and the people who designed and built them.

M-O Valve Co

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July 1945.
May 1960.

of Brook Green, Hammersmith, London.

1919 Private company.

1920 The name of the Marconi-Osram Valve Co was changed to M-O Valve Co[1].

1920 Jan. Physical and Optical Societies Exhibition. Exhibited wireless telegraphy.

1927 Recorded as being a subsidiary of GEC

1929 Gramophone Co acquired Marconiphone Co as well as Marconi's share in M-O Valve[2].

Continued to supply valves to Marconi.

1956 GEC purchased EMI's share in the M-O Valve company.

1958 Business had been focussed on thermionic devices for telecommunications, radar and military, and cathode ray tubes[3]

1961 Manufacturers of electronic and thermionic valves, cathode ray tubes and devices, magnatrons, hydrogen thyratrons, klystrons, backward wave oscillators, travelling waves tubes, T.R. cells and geiger-muller counters. 1,500 employees.

1969 Formation of GEC Electronic Tubes to bring together M-O Valve Co and English Electric Valve Co, a company which would have half of UK valve production, the largest specialised valve manufacturer outside USA[4].

See Also


Sources of Information

  1. Competition Commission [1]
  2. Competition Commission [2]
  3. The Times, Sep 05, 1958
  4. The Times, 22 April 1969