I also use a Cayin A88-T. The build quality of some of these Chinese amps is as good or better than some similar priced American gear. You should consider Line Magnetic as well. I have one of their DACs, also top notch build.
The older amps won’t have any advantage in sound quality. By the time they’re refurbished, you’ll basically have the equivalent of a modern tube integrated, but no remote.
The older amps won’t have any advantage in sound quality. By the time they’re refurbished, you’ll basically have the equivalent of a modern tube integrated, but no remote.