Williamson Amplifier

The Rogers Williamson amplifier was an early and influential high-fidelity audio amplifier produced by Rogers Developments Co. in the late 1940s and early 1950s.
Key details include:

• It was based on D.T.N. Williamson's famous amplifier design published in Wireless World magazine in 1947.
• Rogers was one of the first companies to commercially produce the Williamson circuit, announcing production in October 1948.
• In October 1949, Rogers advertised two versions in Wireless World magazine:
  • Standard Model A with 150mA HT supply, priced at £27/19
  • Standard Model B with 200mA HT supply, priced at £29/10
• It used KT66 output valves in a push-pull configuration.
• Early versions likely used 4 x L63/6J5 triodes in the input and driver stages, though later variations may have used different tube combinations.
• Power output was likely around 15 watts.
• It featured switches for selecting between radio and turntable inputs.
• The amplifier helped establish Rogers as a leader in high-fidelity audio equipment in the UK.
• In December 1951, Wireless World magazine advertised the RD Williamson Model D amplifier (£29/10) and a new, extremely versatile pre-amplifier/tone compensation unit (£9/17/6), which featured accurate compensation for all types of recordings.
• It was part of the broader trend of commercial Williamson-type amplifiers that dominated the high-end audio market in the early 1950s in both the UK and US.

In December 1951This amplifier represents an important milestone in the development of high-fidelity home audio equipment in the post-war era.

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