Personally, I wish it DID use op amps in the preamp section anyway. It will be DAMN difficult to replicate the performance of an AD8599 discretely. Discrete circuits can be built very well, but they are also a bit more susceptible to noise because they take up so much more space and use much longer wires between components. That said, as long as the SNR turns out well, it should be fine. I once had a NAD T753 with the worst SNR ever, so it does happen in relatively expensive gear sometimes. I also agree that room correction is absolutely necessary, and it must be Audyssey MultEQ XT at the very least.
"Vintage" is good for wine, not for A/V equipment.