Radford Electronics is a renowned British audio manufacturer started by Arthur Hedley Radford in 1961 when the STA range of Amplifiers was launched accompanied by the DSM pre-amplifier. The Series 3 STA25, along with other Amplifiers in the STA range, won critical acclaim. As an expert in transformer design, Arthur Radford was able to reduce distortion by a factor of ten over the best performing amplifier of the day.

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  • Radford Electronics is a renowned British audio manufacturer started by Arthur Hedley Radford in 1961 when the STA range of Amplifiers was launched accompanied by the DSM pre-amplifier. The Series 3 STA25, along with other Amplifiers in the STA range, won critical acclaim. As an expert in transformer design, Arthur Radford was able to reduce distortion by a factor of ten over the best performing amplifier of the day. The MK11 and Series 3 Amplifiers used a unique pentode phase inverter that was a joint venture between Dr A R Bailey and Arthur Radford and was the subject of a detailed article in Wireless World. However Arthur Radford’s greatest love was for his loudspeaker designs and the rear termination of drivers. After many years of work he eventually took out a patent in conjunction with Dr A R Bailey for the first transmission line loudspeaker. This system was the basis for all his larger designs and is still used by many well-known manufacturers. Although today the valve amplifiers attract the most attention from enthuiasts, the quality of Radford design continued into the transistor age with the "Zero distortion" series of solid state power amplifiers produced in the mid 1970s in which THD was reduced to less than the circuit noise level. These (and later products such as the Quad 405 and Halcro range) achieved the near perfect measured performance for which designers had been striving since the earliest days of the industry. Left with no potential for objective improvements in quality, the industry started to concentrate on subjective analysis of designs and products which has, in some cases, led to a re-interest in valve amplification amongst audio enthusiasts. At the peak Radford had four factories in Bristol England, employing 160 personnel producing metalwork, painting, printing, transformer design / production Loudspeaker assembly / test and PCB manufacture, all in house. For example another well known Radford product was the "Labpak" low voltage power supply, used in schools and colleges both in the UK and overseas. As Arthur approached retirement the company was wound down as there was no one to take it on. After he retired in 1989 Woodside Electronics was formed by John Widgery, who had been apprenticed to Radford Electronics and was responsible for many of the classic designs. Mike Davis joined John as a partner in 1989 and they worked together to launch the CD player and update the range of valve equipment as part of the Renaissance series. Arthur died on the 21st of November 1993 and Woodside continued for a while but finally ended production in Llanbedrog, Pwllheli, North Wales in 2004. Radford valve amplifiers are rare today and still command high prices on the secondhand market. Much sought after and enthusiastically rebuilt, they are particularly known for classic and restrained physical design and outstanding and listenable sound quality - including a particular ability to drive, very sweetly, the notoriously difficult Quad electrostatic loudspeakers. 2006 brought hope of a rebirth for the brand, with news of plans to begin manufacture of classic valve based designs like the STA 25 Mk III in 2009 . The Radford forum, a Yahoo group of enthusiasts from all over the world, maintains substantial files of schematics, pictures and discussions.
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  • Radford Electronics is a renowned British audio manufacturer started by Arthur Hedley Radford in 1961 when the STA range of Amplifiers was launched accompanied by the DSM pre-amplifier. The Series 3 STA25, along with other Amplifiers in the STA range, won critical acclaim. As an expert in transformer design, Arthur Radford was able to reduce distortion by a factor of ten over the best performing amplifier of the day.
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  • Radford Electronics
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