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Message: <blockquote data-quote="ingenieus" data-source="post: 407156" data-attributes="member: 13716">An adjustable gain control. Hang on, there is one on the preamp. The v-o-l-u-m-e control? :thinking:In the (hack cough hack) classic three stage transistor amplifier, the gain is controlled by the ratio of two resistor values. But you can't change these willy nilly because there are DC offset issues to consider. :stop:The idea of using a high(ish) voltage rail is a good one, but you need a normal one as well. Then you have a class G amp with two PSU voltages. The lower one does most of the work and the higher one only kicks in when the going gets loud. You could in fact have the low voltage amp run in Class A, giving you the best of both worlds. Douglas Self explain this very well in his book "Audio Power Amplifier Design Handbook."</blockquote>