Solid state equipment should last a long time. However, maybe 15-20 yrs *is* a long time for audio gear. In my opinion, the path forward is to is borrow a pre and power amp you are interested in, and see if while listening you say "wow" or "why bother?"
I owned an MF2300 in the 1990s, and when I tried a Bryston 14B SST in its place, it was "wow" -- I put the CJ on the market the same day. Now I use a Bryston 4B3 with Janszen Valentinas, and I like that combination a lot. But those are *my* ears, and your ears by definition are different.
Good luck!
I owned an MF2300 in the 1990s, and when I tried a Bryston 14B SST in its place, it was "wow" -- I put the CJ on the market the same day. Now I use a Bryston 4B3 with Janszen Valentinas, and I like that combination a lot. But those are *my* ears, and your ears by definition are different.
Good luck!