Revision 3 Atma Sphere amps

In case you haven't yet seen it, Ralph recently offered his perspective on the difference from rev.2 to rev.3 at the ASOG's site.
http://www.otlamp.com/forum/messages/3361.html

This question was recently asked on the Atma-Sphere owners group (www.otlamp.com) Somebody indicated that there is little difference between later revision 2 and revision 3. Check out the site. It's a great resource for A-S owners and anyone who aspires to be an A-S owner.