In article ,
Jim Lesurf wrote:
Could be class H. This is a power saving scheme that uses two power
rails - one low for normal listening, and a higher one that gets
added on when the power requirement is higher.

Right - but if you removed the 60 volts you'd get no output?

So the lower voltage is only for the earlier stages? OK, not class H
then.

Hard to guess without the diagrams, etc. But two things came to mind here.
One was that the output stage has voltage gain. e.g. bipolars with
collectors to the output and emitters to the rails. The other was FET
devices with an aburdly high resistance or minimum source-drain
requirement. However I'm also wondering... does the above mean *only* +60
for the output and not +/-60?... Curious.

Here's the diagram of the offending amp.
http://s139.photobucket.com/albums/q...kies/A2070.jpg

--
*If a mute swears, does his mother wash his hands with soap?

Dave Plowman London SW
To e-mail, change noise into sound.