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


Lamm hybrids, Rowland 8t, Levinson 23.5 etc. How reliable are they and how expensive to fix if something goes wrong ? Capacitors, resistors needing replacement, after 25 years, 30 years, something else ?
I didn't mention Gryphon and Nagra, as examples, they are too expensive even old.
inna
Had Rowland 8T for many years Jeff Rowland has great service and says thats the best amp he has ever made.
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.