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The QUAD II tube amplifier was manufactured by a company with big traditions, as founded by Peter J. Walker in 1936, SP Fidelity Sound Systems, renamed later in the same year to the Acoustical Manufacturing Co. Ltd. The company was initially located in London, but after a bombing in 1941, was moved to Huntington. The name "Ouad" is an acronym for "Quality Unit Amplifier Domestic" and I must admit that the equipment bearing this name deserve to be called a high-quality audio equipment. The name "QUAD", used for many years only to manufactured products became so known in the market that in 1983 the company changed its name to QUAD Electroacoustics Ltd.