Top vintage receivers vs. modern high-end equipment

I have a JBL Metregon, your Paragon's little brother.  We are both very lucky people!Both the Metregon and Paragon are pretty efficient and I have run mine with both tubes and ss.  With the Prima Luna Prologue 6 monos (with either Psvanes KT 88 Mk II IIseries or  JJ E34L Blues the sound is as you would expect very tube like.  Warm and rich with the E34Ls I think surpassing the KT88s in a very sweet and detailed midrange. The power difference isn't that great between the 2 sets and the Paragon doesn't need it anyways.  The KT88s have a slightly deeper defined bottom end. I ran a friends' 12 w tube amp to demonstrate it for him and the Metregon could still blow out the room.
I have many hours running the Metregon with a Pioneer SX1050 (fully refurbished) and because the 1050 was designed to be tube like there is very little difference except because of the 1050s power the bass is stronger and I think more detailed.  The mids and highs are very nice and certainly very acceptable but not in the cat of either tube set. I think the horns like the tubes better.So take this for what it is worth, I really don't think you can wrong either way
Best 
Mark

psI use a Jolida tube pre with the PLs

I'm not saying you should get one , it's not the best by any means but some of these old amps have a non audiophile magic. I acquired a Mapleshade Scott LK48 not really knowing what it was. I brought it to work hooked it up to some Paradigm very first generation Atoms speakers, a 2 or $300 speaker, source was an old Denon DVD player. I hit play and could not believe those Atoms could sound like that. I brought it back home that same day. Hooked it up to some Usher tiny dancer and with jazz, blues or non complex music there is a very natural presentation that addicting. No big bass or super detail. 

I'm not saying you should get one , it's not the best by any means but some of these old amps have a non audiophile magic. I acquired a Mapleshade Scott LK48 not really knowing what it was. I brought it to work hooked it up to some old Paradigm first generation Atoms speakers, a 2 or $300 speaker, source was an old Denon DVD player. I hit play and could not believe those Atoms could sound like that, they never have not even close. I brought amp back home that same day. Hooked it up to some Usher tiny dancer and with jazz, blues, folk or non complex music there is a very natural presentation that's addicting. No big bass or super detail. This was my first el84 amp, just makes me want to hear more el84 amps. I have some mullard el34 xf1 and 2's and love those tubes but the el84 is now one of my favorite tubes, wonderful tone. One trick take out hard wired stock power cord and put in a IEC.

I’m in my late fifties and have has so much gear throughout the years it’s silly.  Mac, Pioneer, Sansui, Phase, Citation, Krell, Levinson, Crown, marantz, etc.

Some pieces I’ve kept and swap in every now and then, but my go to does everything right is my Sansui 9090DB.  It’s so smooth, has grace and power. I can’t find any sonic shortcomings.

My audio buddies are always amazed at just how ‘good’ it sounds. 
Just the right amount of everything.  My second favorite are my vintage marantz preamps.