Raven Osprey with Spatial M3 Sapphires

@audiosaurusrex -- thank you for the detailed response. I really like what I'm hearing -- magical midrange, clean detailed, not overly warm/tubey, huge soundstage, palpability.

Since you have had SS amps before, how do you compare bass and dynamics? I used to have an Audio Research GSi75, and while I really liked the amp, I was never impressed by the quality of the bass -- too loose and flabby. This is one area where the Luxman 590AXII just walked all over the ARC. Of course, I understand that tube amps have their limitations when it comes to bass, but having said that what are your thoughts on attributes like punch, tightness and control, especially when compared to your experience with SS amps?

@arafiq 
Yes I didn't speak to the bass. I have owned Parasound, Krell, more recently SPL and then decided to switch to tubes. So the big difference in bass for me came when I went with an open baffle speaker. I came from Vandersteen 2 ce's which made the room shake. The M3's certainly don't do that, they're so very different. It took me a while to adjust to the change thinking I was missing something. I was wrong, in fact the Spatial's brought out everything in the music, just not over emphasized.
Even with the SS amps the bass was noticeably better, tighter and more detailed. The Octave was certainly leaner but again more real IMO. When I switched to the KT150's bass response improved even more. I think based on your room acoustics and getting the M3's dialed in the Octave is a stellar performer. The other thing I read after the fact that the V70 Class A seems to be optimized for 4 ohm again another match with the M3. @jjss49  is correct with his assessment on power. The Octave has the ability to use low power tubes KT88, 6550 which I tried and the difference is very noticeable. The higher power just makes the M3 so much fuller. Octave manufactures their own transformers and Andreas and family are very responsive to inquiries. I've emailed him quite a few times to ask for his expertise. Always responds even to my more mundane questions. Both Octaves I demoed are dead quiet and use the ecopower to save tube life. The V70 is autobias and the V40 you have to adjust. I found the V40se to be a beautiful amp with the M3's as well for half the money. Same price as the Osprey. The V70 Class A (Reflection price range) takes that beautiful midrange and IMO achieves what Clayton Shaw intended in his engineering of the M3 Sapphire.

@audiosaurusrex -- thank you, again. Your posts are really so helpful, there's nothing better than hearing from actual owners instead of professional reviewers or dealers. Also, appreciate the offer to visit your place. Unfortunately, TX is quite a ways from MA, otherwise I would have definitely taken you up on the offer.

BTW, do you know if your amp can take KT170s? I've heard that they take it to the next level.

@arafiq 
yes too bad. My family is down in Houston but they’re not cursed/blessed with this hobby ;-)
I don’t believe the V70 will take the 170’s but honestly the 150’s are just so amazing.
enjoy and hope you let us know what you wind up with.

What about Pass xa25 or 30.5 maybe 30.8?