Here's another interesting post on the same subject:-

From: David Nebenzahl
Subject: Another stereo amp using a common output xfmr
Date: Mon, 06 Nov 2006 04:05
Newsgroups: sci.electronics.repair

Hey, guess what: was browsing through some other stuff (looking for 813
tube circuits, akshooly) when I ran across this circuit:

http://members.aol.com/sbench/1060amp.htm

Another stereo amp that uses a common xfmr for both channels, with a
"helper" transformer, just like the one we discussed extensively above.
With an explanation of how the damned thing works, no less.

--
*Do they ever shut up on your planet?

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