But in tubes, excepting OTL, transformers are a necessary and accepted part of the circuit. It is one of the virtues of SS that they are not required, what they are doing in Mac is a mystery in this day and age. Allegedly in the early days they were put in because Mac didn't have a clue how to design transistors. There may be some truth to this, I was at a Mac clinic in Chicago in the middle 60s when a electrical engineering student from Cal Tech brought in a very good looking home made transistor amp labeled "Fengs Folly". It measured beautifully and the Mac guy ask him"how would you like to work in upstate NY." He was at least half serious. If you want the sound of transformers get tubes, if not get transistors, don't mess with mister in-between.