JTN ...
By vintage, we are talking at least 25 years old ... right?
I have been using two restored Marantz receivers for the last 4 or so years (2216B and 2240). Their tuners perform great, but the amplifiers will sound like a modern amplifier only with judicious use of the tone controls. A NAD C320BEE will best these two receivers for most tasks.
Tube to tube, I had a Scott 299 for a while, but my Prima Luna Prologue Two is just better. There is a cost difference ... but also a performance difference. I find the old vintage amps have the desired warm sound to them, but are just not as clear and clean sounding.
If you do go the vintage amp route, I am of the mind that you should consider going vintage speaker. If you research these things over at Audio Asylum, there are threads that point to how damping and slew factors, etc are different today and that speakers were voiced back then to take this into account. But as said before, restoration is really the key.
Regards, Rich