It depends on your definition of hold up is. A good condition vintage receiver, mated to a compatible speaker, can sound anywhere from "vintage" (aka poor) to pretty damned fine. But I doubt that anyone would replace their Shindo gear with a used Pioneer receiver.
Having said that, I have restored vintage receivers and integrated amps that have been excellent systems in their own right. I bought a Luxman amp new in 1975, and regularly used in an office system it until I gave it to one of my daughters a few years ago. New caps are often (almost always) helpful if not necessary, and if you can't do it yourself the added expense might make the total cost unattractive.
Having said that, I have restored vintage receivers and integrated amps that have been excellent systems in their own right. I bought a Luxman amp new in 1975, and regularly used in an office system it until I gave it to one of my daughters a few years ago. New caps are often (almost always) helpful if not necessary, and if you can't do it yourself the added expense might make the total cost unattractive.