Big vintage amps worth paying for and keeping for a long time

When I see the word " Vintage".  I thought you mean Western Electric , Jensen and old Fisher amplifier.

They are worth getting.

Rowland, Lamm, Levinson are not vintage but just middle age old amplifiers.

Okay, whatever we want to call them. But no I didn't mean too old amps.

Any of the Krell CX series of Full Power Balanced amps

Perreaux 1250B! I have one and it's certainly competitive with Levinson for build and SQ!

Any old amp should be checked for snubbers. If there is no snubber circuit for the bridge rectifiers then they should be replaced with soft recovery rectifiers. Beyond that, finding repair parts can be difficult to pretty much if not impossible. Through hole semiconductors are going obsolete at a pretty fast pace. I am horsing a few for many of my old amps.