Sancho22, nice speakers! I had a pair soon after their release. Small budget then. I first had a Haffler 200, just OK. Later upgraded to a CJ MF200 in the late 80s and it was much better. I would think any CJ (non-tube) would be great. The 3.5s are not an extreemly hard load so higher end tubes with power for the bass boost will work great, but that may not be practical.
A friend has an Ayre v3 with Thiel 3.6s which sounds great and you may know the 3.6s are a much harder load. I owned those as well.
Right now I have another pair of 3.5s, pick up used for a second system, that runs off an old Adcom 545 which is just enough for medium volume but the sound is very nice. A CJ or Ayre would be better...for a lot more money.
Bottom line, you may need some power depending on room size but there are many options for the 3.5s.
Terry
A friend has an Ayre v3 with Thiel 3.6s which sounds great and you may know the 3.6s are a much harder load. I owned those as well.
Right now I have another pair of 3.5s, pick up used for a second system, that runs off an old Adcom 545 which is just enough for medium volume but the sound is very nice. A CJ or Ayre would be better...for a lot more money.
Bottom line, you may need some power depending on room size but there are many options for the 3.5s.
Terry