Since I built my first tube amplifer in 1969 I have always followed this technology. Not just copying schematics and building it, biut learning how and why they work as they work. This meant extensive studying on the electronics. But It did let me take away the magic and approach it with some common sense. Something that seems to disappear a bit these days. As such you get all kinds of mythical statements on the web while in reality it is just plain common maths.