"Jim Lesurf" wrote in message


I guess designers of commercial audio amps back then were
more habituated to using transformers than nowdays. I
didn't know about the above, but recall that some early
domestic transistor amps included things like coupling
transformers.

Driver transformers were last used in US built hifi amps, probably in the
origional Acoustic Research amplifier and receiver. Probably early 1970s.
It did not appear that they hindered performance all that much. It was a
pretty passable solution for building a SS amp in the days when
complementary transistors were expensive or simply unavailable.

http://www.hifiengine.com/manuals/ac...receiver.shtml .