Sugden Audio is a British engineering company that manufactures hi-fi and audio equipment. Founded by James Edward Sugden in Cleckheaton, West Yorkshire in 1967,^[1] the company is best known as the manufacturer of the Sugden A21 amplifier.

Sugden had been involved in the manufacture of scientific equipment since 1960 with his company Research Electronics.^[1][2] Sugden was keenly interested in hi-fi, in particular in overcoming the problem of crossover distortion common in Class B solid state amplifier designs at the time. He developed a Class-A amplifier, the Si 402, which avoided this, however it was extremely expensive, costing 100 Guineas (£105, equivalent to £2,000 in 2021^[3]) and few if any were sold.^[2] At the time, Sugden was the only company in the industry using Class A design in their Hi-Fi amplifiers.^[1]

The following year Sugden agreed to work with local loudspeaker manufacture Richard Allan, which would market Sugden's amplifiers under their brand name.^[4] In April 1968 the A21 amplifier was premiered at an audio fair in London. It would sell for a much more attractive £52 and received good reviews in the audio press.^[4]

Shortly after they set up a factory at Carr Street in Cleckheaton in West Yorkshire and started producing the A21 amplifier under their own name.^[1] They subsequently expanded their range of products to include other amplifiers and tuners.

In 1981 they relocated to Valley Road in Heckmondwike where they remain.

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