Greetings. Several years ago I built Bob's ST-120 amplifier and have enjoyed it immensely. I am an electrical engineer and have a question on the design of the ST-120 amplifier. We have the classic power amplifier designs such as The Williamson, The Mullard 5-20, and The Quad II. The Dynaco wiki page mentions that Hafler wrote an article for Radio-Electronics Magazine in 1955 delineating the design of a high-power version of the Williamson amplifier using Ultralinear circuitry. From studying the schematic of the Dynaco ST-120, I can see the various characteristics and stages of the amplifier. For example, the input stage, the 180 degree phase splitter, the push-pull output stage, and the negative feedback. I would like to know which classic amplifier the Dynaco ST-120 closely resembles.
Thank you,
Chuck
Thank you,
Chuck