I am driving my Stages with TRL GT-400 and I love it!!!!!!
I agree with So_good that a *good* 100-150 WPC tube amp can drive the Stage well.
A good tube amp to consider is Audio Valve Challenger. Its sound is lush and seductive.
that's fine but can you tell us how they sound when you hear Bruckner 8th symphony at realistic volume or some Puccini or Wagner opera ?
If you want to get the best out of these speakers you need to control them perfectly ...
and this was quite a problem in the eighties