Have a PL-4000 inbound that needs a complete reflow,. Once that is corrected then have to find a PL-400 to rebuild and modify. Remember seeing that combination in a stereo store in the mid 70's gracious 50 years ago. Will be interesting to see how it does against my full on restoration of a Sansui CA-3000/BA-2000 combo. So for now will be doing lots of reading on those two pieces. As a side note rather conversant with KiCad, given all the threads about that main control board designed before plated through holes might just have to give myself a winter project and come up with a modern version.
I also see the love for the 700 however the 400 has more than enough power and that look hits all the right buttons for me. And another note since I am rambling about, I really really like all my quad gear so will be interesting to see how well the PL-4000 SQ mode stacks up.