I gotta say when you answer a question; you answer a question. I see that as the questions get more specific your answers really become easier to follow and more enlightening. Thats a talent. Can I ask; When you say we use "the mu output", and this; gets us the low output z at the "expense" of requiring attention to the PS output z; can you maybe elaborate. I know what mu means and how it relates to a tube but why we incur an expense from the PS that is different from another circuit topology is something I am not sure of. I hope I said that right. Thanks as always; J.R.