It took some time to find the discussion of this circuit from Bob Cordell so I decided to make a thread with it as the title. I seem to recall a more detailed analysis of the balanced drive buffer but can't seem to find it. There is at least some discussion after Bob's first post #199:
http://www.diyaudio.com/forums/soli...complementary-input-stage-20.html#post1305166
Bob provides the LTSpice simulation files here in post #208:
http://www.diyaudio.com/forums/soli...complementary-input-stage-21.html#post1305497
http://www.diyaudio.com/forums/soli...complementary-input-stage-20.html#post1305166
Bob provides the LTSpice simulation files here in post #208:
http://www.diyaudio.com/forums/soli...complementary-input-stage-21.html#post1305497
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