In Reply to: Class G linear amplifier posted by Z. Tao on 12/20/01 at 6:41 PM:
Hi, Z. Tao.
The Google search: http://www.google.com/search?q=class+G+linear+amplifier&btnG=Google+Search has a number of sites on the topic.
One of them says, in brief, that in class-G, the amplifiers supply voltage is modulated in keeping with the level of audio output required.
(I've never personally heard of this being used anywhere, but then there is so very much in this world of which I seem to be unaware.)