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LEAK is the brand name for high-fidelity audio equipment made by H. J. Leak & Co. Ltd, of London, England. The company was founded in 1934 by Harold Joseph Leak.  The company initially focussed on provision of amplifiers for public address systems and theatres, with only a few staff. Typical designs used were similar to those found in the Partridge Public Address Manuals of the time, which used Osram's DA30 power triodes in push-pull for 45 watts output. During the latter part of the Second World War, the company started developing amplifiers that made extensive use of negative feedback to achieve...

  Igranic of 147 Queen Victoria Street, London, EC4. Telephone: Central 7123. Cables: "Igranic, London" of Bedford (1943) 1913 Private company. 1916 Patent - Improved Means for Controlling Electric Motors. 1920 September. Exhibited at the Machine Tool and Engineering Exhibition at Olympia with chargers for accumulators used in electric trucks. 1924 Patent - Improvements in or relating to means for inductively coupling electric circuits. 1929 Advert for Radio Components; Short Wave and Universal Portable Reveivers. Manufacturers of Radio Receiving Sets: Neutrosonic, Universal, Neutor-regenerative; Outfits for building Receiving Sets: Igranikit, Supersonic-Heterodyne. Radio Components. Gramophone reproducing equipments for cinemas, Ballrooms or domestic...

The Ken-Rad Corporation, Incorporated, A Division Of Ken-Rad Tube & Lamp Corporation, Owensboro, Kentucky owes it's inception to the Kentucky Electrical Lamp Company which began operations at 817 Lewis Street during February 1899. The company was sold to Roy Burlew in 1918 who also founded the Kentucky Radio Corporation with just 6 employees later shortened to Ken-Rad. Burlew grew the company significantly as the lamp plant continued to be profitable with Burlew expanded the product range to include the manufacturing of valves for radios in 1922 and by 1930, the company had expanded to open plants in Bowling Green, Tell City & Huntingburg, Indiana....

December 1946 Establishes Kasuga Radio Co., Ltd. (predecessor of Kenwood Corporation) in Komagane, Nagano prefecture.  January 1949 High-frequency transformer passes the NHK (Japan Broadcasting Corporation) approval certificate for the first time in Japan.  January 1950 Renamed Kasuga Radio Industry Corporation.  February 1955 Establishes the Tokyo office in Ota-ku, Tokyo, and begins mass production of audio, communications and measuring equipment.  January 1960 Renamed Trio Electronics, Inc.  September 1962 Launches the industry's first transistor amplifier.  December 1963 Sets up a sales firm in the U.S., and begins full-scale overseas operations.  January 1966 Fully transistorizes audio products for the first time in the...

1922 Company founded. 1928 Public company. 1938 Company made private. 1961 Radio and television manufacturers, electrical engineers and plastic moulders.