Most Dynaco followers know that the push-pull output stage with negative feedback on tube amplifiers was developed by D. T. N. Williamson about 1947. Ed Laurent and David Hafler used the basic Williamson output circuit in the creation of the Dynaco Mark II in 1955. I ran across two of Williamson's original papers the other day. These were originally published in the British magazine "Wireless World". The 1952 article is in more depth.
D.T.N. Williamson 1949 article
D.T.N. Williamson 1952 article
Bob
D.T.N. Williamson 1949 article
D.T.N. Williamson 1952 article
Bob
Last edited by Bob Latino on Mon Aug 16, 2010 5:12 am; edited 1 time in total