For technical informations, I have uploaded the Owner's manual and a clean schematic on the Yamaha database on AK.
I've made minor modifications in my unit, mainly to reduce the offset and the noise floor, but it remains a 25+25 Watts amplifier...
http://www.audiokarma.org/forums/showthread.php?t=154865&highlight=yamaha
also you might find this thread interesting (odd that you'd have missed it):
http://www.audiokarma.org/forums/showthread.php?t=230585
. . . but it remains a 25+25 Watts amplifier...