I was a Scott collector at one time and had almost the whole range, was just short a few pieces. I was also into vintage for a long time. I have come to the conclusion for my ears that most (not all) vintage pieces are just not up to snuff with the stuff around today. (Vintage meaning Scott, Eico, etc, not ARC, CJ which I still beleive some (not all) of the older pieces are still up there in sound quality). I say that, but it all depends on the sound you are looking for and what you will listen too. In stock form, I didnt like most vintage amps. I had a famed Marantz 8b and it didnt really do it for my, I liked a rebuilt (new caps only) Dynaco ST70 and ST35 much better. Dont flame me, just my preference to my ears. I used to hate 6550 amps as bright or missing magic. But I now have Cary SLM200 which use 6550 and they are awesome.
This is my opinion, with the price of some used modern equipment costing equal or less to some vintage pieces, modern is the way to go.
Good luck with your decision.