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Sugden Audio.....The Tradition of Class A PurityJames Sugden,widely accredited with producing the world's first Class "A" amplifier under the name of Richard Allen,a most famous brand of English loudspeakers in the 1960's,went on to bring his own name to his amplifiers after 3 years of production for Richard Allen.The natural question here is what is a Class "A" amplifier?In simple terms a Class "A" amplifier has all output devices conducting at all times as against a Class A/B design which swit …