I’m still using my 1989 vintage NAD 7600 in my reference system. This was NAD’s best integrated amp and tuner put on the same chassis: 150 wpc into 8 ohms, 500 watts of dynamic power into 4 ohms for 200 milliseconds (ten times the typical duration for this spec). But specs are not the point, as has often been stated here. Sure that I could improve my system with newer amplification, I had a friend’s Primare A30.1 for several weeks: a dual mono design, award winning and with many faithful fans, made in Sweden in the twenty-teens. The NAD sounds more natural (more realistic instrumental timbre), creates a wider and deeper soundstage, and is better at specifying the location of instruments in space. Also tried another friend’s Outlaw; same result. The differences are very slight; both the Primare and the Outlaw sounded great (although I was disappointed with vinyl through the Outlaw, while the Primare had no phono circuit at all). But the NAD sounded just slightly better than these much newer units. The NAD has been checked out, but I’ve not had to re-cap it or in any other way modify it; even the hard-wired power cord is original. And the NAD, besides having a tuner, also has a first-rate RIAA equalized MM/MC phono stage, very useful "semi-parametric" tone controls, an indispensable powered balance control (you’d be surprised how important fine-tuning the balance is for maximizing the spatial effects), and other features not found on most "high-end" separates.
Richard Clark, Peter Aczel and others have done empirical studies confirming the relative unimportance of amplification, so long as one’s equipment is sufficiently powerful never to be driven into clipping. This should be taken into account here.
Finally, one might also note the astonishing sound quality of the earliest stereo recordings, made before consumer stereo was even available for purchase. Fritz Reiner and the Chicago Symphony Orchestra made recordings for RCA "Living Stereo" of Dvorak and Mussorgsky in 1957 (the Westrex disc cutter made the production of stereo records possible in 1958). Available now on SACD, these recordings rival anything made since for sound quality. That should tell you all you need to know in order to answer the OP’s question.