The introduction of the Williamson Amplifier in the late 1940s
changed the hi-fi world forever. Throughout the 1930s,
technicians and inventors had made great progress in developing
technologies that resulted in improvements in the sound quality
of music and sound systems. For instance, microphones introduced
in the 1940s were made to deliver the full range of audible
frequencies with low distortion. FM radio, introduced in the
late 1930s, provided listeners with a new source of music and
entertainment with excellent fidelity. There were changes in
sound technology that were transformed from expensive,
commercial systems, such as those used in the movie industry, to
inexpensive consumer items. One of these was the famous
Williamson Amplifier circuit. D. T. N. Williamson was an English
engineer working for the M. O. Valve Company. He later worked
for the Ferranti Company. His amplifier circuit design was first
published in a series of articles in the magazine Wireless World
in 1947, and it immediately attracte