I resurrected my system five years ago by purchasing a Yamaha A-S3000 integrated amp. It was a huge sonic improvement over the Yamaha A-1000 integrated I bought in 1985. It was easy to discern because I had the same speakers, Infinity RS-4b’s.
The sonic improvement was the start of a very deep rabbit hole for me. I upgraded speakers next with Magico A3’s. Then I listened to a Prima Luna integrated amp a buddy let me use. That led to buying a Dynaco PAS-3X tube preamplifier. I paired that with the A-S3000. The sonics were an improvement over the A-S3000 alone!
I’ve since upgraded the preamplifier, the power amplifiers twice with two pairs of mono blocks, added a separate phono preamplifier, upgraded the turntable, cartridge, cables, power cords and added room treatments, Soon the power conditioner will be next.
I’ve enjoyed the journey but I was naive as to what I was getting into when I upgraded to the A3’s in regards to what it would take to bring the sonic level of my rig up to what I heard in the demo. My advice is to proceed cautiously.
Obtaining synergy between components most likely will become very expensive. I also have another rig which uses the old RS-4b’s with a Scott A 436 integrated amp and McIntosh MR-55A tuner. I enjoy that system almost as much as the main rig when I listen to it!