Thanks for this post. I'm exploring the same thing. I currently have a Line Magnetic LM-508. Its a SET Class A tube integrated. Unlike most SET tube amps this one has balls. 48 watts per channel. However, its very large, heavy and hot. It has no issue with moderate sensitivite speakers but not sure how it would do with less sensitive speakers. Spatial X-5's are on my short list for my next speakers and I think the LM508 would be a great match. However, I'm also considering some less sensitive speakers. I also just acquired a Kismet stereo amp from Odyssey. I'm actually breaking it in now. My idea was, in time, to get a Sachs preamp and partner it with the Odyssey and see how it sounds compared to the LM-508. I'm hoping to retain the tube microdynamics, tone, holographic imaging but with more power for less sensitive speakers. Your post has me thinking I'm heading in the right direction. Thanks for the post.