Thanks both for your replies, I was considering the Audio Research CA- 50 tubed integrtated as a replacement to my Classe CAP 151. But my worry has been that that AR would have enough reserves and all to safely handle my listening needs or if it was just too low on power to be avoid problems no matter what I listen to. I have never had any tube gear in my systems before and just have a lot of concerns and need help to stay out of troubled choices.