Thanks, jb0194 - interesting to know how downsizing can be done without too much sonic loss.
Wolf_Garcia and Elizabeth - OK, tubes can be "too much", but does it need to be so? I agree that tubes give better sound (to my ears). That’s why I changed from a Krell FPB600 solid state system. I have had troubles, yes, but I think they can be solved.
The main factor of component breakdown, I think, is time x heat. If you give a component a lot of heat it will last shorter. If this heat come from solid state or tube amps or preamps is not decisive. Class A solid state runs very hot too.
To cool down - literally - my own cost of ownership, I now have two computer fans mounted on the wall behind the most heat-prone components of my system. After I adjusted them down to low volt, the fan spinning slower so I cannot hear it, still giving a cool breeze over the components, I am very happy., A 100 USD investment, or so, to increase the chance of components holding up. Even here in Norway, it can be come very hot in the summer, it was 32 celsius, a week ago.