Would MC501s Rescue My Sound Quality?

[robinmtns]

Hi again. I've recently moved to a new house (and new country but thats a different story). By the time I left Colorado, I had my system dialed in pretty well, and was enjoying about the best sound I've ever had.

WHAT'S DIFFERENT
Unlike wood construction in the US, here in France construction is mostly cement block walls and cement floors. The space is also different with very tall ceiling sloping up to an open loft. Distance front to back wall is 11m/37ft and side to side 4.5m/15ft. Equipment is same but C2200 is now running on 230v and MC275 is on a step-down/iso transformer. I used to listen in near field and now my listening place is 6m/20ft from the speakers.

AND THIS HAPPENED
When I first fired up the system it sounded AWFUL! Strident, echoey, jumbled, incoherent with 0 soundstage. As it played longer it sounded better, maybe it didn't like the container voyage? But then leveled off at so-so SQ at best. Now have makeshift room treatments at first reflections and front/back walls and they're helping. But still only the beginnings of a soundstage/imaging and generally the sound does not fill the room. My speakers are Spendor S100s that are known for their rich sound, with a great mid bass, running 13" woofers. In this room they are sounding thin.

SO MY QUESTION
Is solid state power needed? I have been doing some research on this and I'm intrigued. To put a bogey out there, lets say I'd replace my MC275 with a pair of MC501s. If I were to take as gospel all that I've read about the 501s they will: not lose the tonality of a tube amp; create a killer soundstage; fill the room; restore the bass/mid bass and eradicate the thin sound. Now, it's been a few years since I've been a serious listener to a solid state amp, and maybe transistor amp technology has improved leaps and bounds. But I gotta say I'm skeptical.

WOULD LOVE TO HEAR YOUR EXPERIENCES
If you have made the same amp change, or if you have heard a familiar system before and after the same or similar amp change please share what you heard. It would help me a lot. You just could help me avoid making a big mistake that I'll regret for a long time.

Thanks!!