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
@ebm "Had Rowland 8T for many years Jeff Rowland has great service and says thats the best amp he has ever made."

I always react whenever I hear someone say this.  While it's often true in other realms, when it comes to a still viable HEA manufacturer on that level, it defies logic. If that was really the best amp he ever made, why did he stop making them?  More importantly, why on earth would anyone spend such incredible prices for his more recent / current offerings when they could own JRDG's best amplifier for so much less?  More likely, it's meant to diffuse the typical audiophilia nervosa, and put the owner at ease.
Roberjerman, do you mean a Perreaux 2150B? I too have one, sitting in my garage. Thanks for reminding me🤔  
@tubegroover : my mistake! I have the 2150B. Big and heavy! 200 watts/ohms, 400/4ohms. Clipping at 300+ and 500+ watts respectively! Sound quality as good as Levinson or any of today's expensive amps! List price $1500 in 1983. I bought it to use with my restored DQ-10's. A forgotten "sleeper" amp! I'm holding onto mine! I suggest you take it out of the garage, clean it up and put it to use! Or sell it to someone who will appreciate it!