I don’t have experience with those integrated amps, but I think the character of the preamp will be preserved using class d. I think a nice tube pre and a class d amp would be great. For me it was all about whether the speakers will respond to the additional power. My McIntosh was going into protection mode more frequently than I liked and that was an additional incentive to try class d. My wife complains about how loud I play my tunes. Lol. I also like having a back up amp in my main system. Don’t be intimidated by the naysayers to try class d.