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The Williamson amplifier used negative feedback coupled with a special design of output transformer, to produce lower levels of distortion than previous designs.
The articles were detailed, which insired many builders to constuct copies, both for their own use, as well as for sale.
The basic amplifier was designed to use GEC L63 Triodes as phase inverters, and drivers. Later in August 1949, Williamson recomended 6SN7s for these positions. The output stages were Triode connected KT66 Pentodes, although a 6L6 was also reccomended as long as its slightly lower output was taken into account.
D.T.N. Willamson, The Williamson Amplifier - A collection of articles reprinted from Wireless world, (Reprint 1994)
Vacuum tubes