This is all very interesting. Perhaps a better choice than high-powered vintage receivers is some classic tube equipment, like the Marantz 7 preamplifier, and Marantz 8b amplifier combo. I once had a Model 7 and was impressed with it. The 8b has a simple circuit with what might be the best output tubes out there...that might be a good way to go: you stay in the vintage era like the Paragon, and get very good (although not very high-powered) amplification.
Top vintage receivers vs. modern high-end equipment
I am considering pairing an old amplification system to my JBL Paragon -- the idea of getting an all vintage system is very attractive to me. Among other things, I am looking into classics such as the Pioneer 1980 receiver or the Marantz 2600. Does anyone have direct experience in comparing this kind of equipment (very high-end but 40 years ago) to current high-end equipment, imagine an integrated Pass Lab amplifier? How do they stack up? Thank you.