Small change to the filament inrush/dropping resistor circuit that I started implementing in the Rev C's (and Ikes). No sense of adding extra heat down there when it is not necessary. Affects the parts list and new units - no change is necessary for earlier Rev C units, but if you are in the process of building you ought to go ahead and mount them on opposite sides.
http://www.diytube.com/revision.html
Shannon