Threshold S/300 Power Amp


Does anyone know what the difference is between the original S/300 and the MK2 or modified S/300. In other words what internal parts were changed in the mod? Also, who does these mods and where are they located?

Thanks for all comments and I look forward to hearing from you.
rbwinterlink
http://forum.audiogon.com/cgi-bin/fr.pl?aamps&12326244

http://forum.audiogon.com/cgi-bin/fr.pl?aamps&123359840334

http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1232592025