First of all, the transformer is the same at 750VA (there was some rounding off of values in some of the earlier Krell literature, but it has always been 750VA). The internal layout is a virtual dual mono design, with each channel seperated with dedicated heat sinks and localised power supplies (large caps)..I believe it's two per channel. The preamp stage is an evolution based class A design, not just an overglorified volume attenuater like before. The wiring is much more substantial as well. The power delivery noted in the HiFiNews article indicates a far more capable integrated amp vs it's predecessor. Call Krell for more insight