Tube amps under $7500

@mdalton Ah. That explains everything.  You have scored some truly classy gear at good value. I  admire, but can't emulate. The stoic good humor alone would make all worth reading. See below. 

@larryi Just so. In a perfect world, I would bi-amp with Aric or such on top and Coda or such on the bottom. But I am old, not to mention tech-lazy, and times are chaotic, and 90% of my listening is casual, which leaves me in the usual compromise state, albeit vastly better informed owing to the wealth of information shared here. Thanks to all.  

+1 @larryi 

My listening values are pretty much the same.  I have no experience of Legacy speakers but I take the OP at his word that they are non-negotiable.  That’s why I suggested the possibility of bi-amping, as one approach to solving these simultaneous equations.  But for me, with my listening values, if I wanted to experience the magic of tubes, I’d think about easier-to-drive speakers.  Having said that, the OP is taking a nicely deliberate approach and might just be able to get it all with the Legacies and the right tube amp.  And I’m enjoying trying to help. 

The MC275 is a great amp once you throw away the junk OEM tubes. Which should he done with immediacy IMHO.

@mdalton 

Bi-Amping is the way, at least for me.

I have two mono-blocked MC275s (running GEC A2900s and KR Audio KT88s or GEC KT88s depending on any  given day) up top and a pair of Pass Labs xa160.8 mono-blocks down under. I love how they sound together.

Speakers are BW 802D4s.

@larryi I'm told that many tube users are switching to Coda SS amps. Extended bottom end is a necessity for me.
@mdalton Sounds optimal, but how do you manage level matching, etc.?