Carver 275 Crimson tube amp --- any feedback appreciated

I would say it has great bottom end and smooth but with warm tones. Top end is not bright but clear. All this compared to ARC VT80 and Cary equipment.

New owner of a Crimson 275 purchased from Jim Clark. I love this amp! I've been around long enough to remember riding my bike to the corner drug store to test tubes from the family's tv's and radios. A little over a year ago I decided to get back to the basics of tuby goodness and bought a Vincent SV-237MK hybrid. Loved the sound of it enough that I decided to try a full tube rig. I picked up a chifi Muzishare X-7, a surprisingly well built and competent integrated amp running KT88's with a both SS and 5AR4 for rectification. I did run it for a short time as an integrated, but it has no tone controls and was a little too neutral for my tastes. The 237MK has an excellent tube preamp in it, and really made the X-7 sing. After about two months with it, I was hooked and started shopping for a final replacement. My requirements were, preferably US made, by a company with a reputation for quality, and a price below $6 K. I remembered Bob Carver's name and reputation but didn't know he was still actively producing equipment. It didn't take long for him to jump to the top of the list. I really liked his methodology for running the tubes at a less demanding voltage because I don't much care for the crap shoot of replacing output tubes on a regular basis and hoping that the sound at least stays the same.
One thing I really liked about the X-7 was it's selectable Ultralinear/Triode output mode. I much preferred UL for the majority of listening because triode, at least with the X-7 was slightly muddy. I had read that Bob Carver wasn't much of a fan of running tubes in UL, so I was kind of leery about that. Jim Clark convinced me that the Crimson 275 didn't have a triode sound signature, so I ordered one up. Best audio choice I've made in awhile. Using the Vincent as a preamp, the Crimson 275 comfortably walks the center line between ultralinear and triode all while retaining the best of both. Paired up with Klipsch Cornwall 3's, it has deep but not overwhelming bass, vibrant midrange, and clean but never harsh highs. I have no idea how it would sound with a preamp with no tone controls, and being old school, I would never buy one. Part of the reason I bought the Vincent was because it has both tone controls and a loudness switch. Most of my listening is at lower volume levels where a loudness switch really makes a difference. 
Let me start this summation by stating that I don't work for Jim Clark, nor have I ever met him! If you are hanging on the fence about the 275, get it from Jim Clark, and you can send it back if you don't like the sound. That's why I bought mine from him. All you will be out is shipping, and since it doesn't weigh 50 pounds like most tube amps, even that's not a deal breaker. One poster made a statement about the weight of an amp equating to quality. The Crimson 275 easily debunks that one too. 
BTW, you can mono block the 275 and get 150 watts per channel. Jim has a video both on his store site and YouTube on how to accomplish it. You'll get pretty much the same sound signature as their Crimson/Raven 350 Monoblock for $4 K less. (their words, not mine, but I believe it) The Crimson 275 is a keeper.

My System:
Bob Carver Crimson 275
Vincent SV-237MK
Sony HAPZ1ES
Technics SL-1500C/Ortofon 2M Bronze
Klipsch Cornwall III
Pangea Audio Premier SE interconnects
SKW Speaker Cables
Pangea and other brand high current power cables
Furman SPR-20i on dedicated 20 amp circuit with Pangea outlet

I have one and thinking of getting another and go mono!!! Anyone try this yet?

I am pretty sure that the 275 cannot be configured mono.

I was really hoping that they would come out with something in between the 275 and 350.

My speakers, Legacy Whisper XDS, have built in amps for the woofers so the 275 would likely be adequate but would prefer some mono blocks in the 150 or so range (partially just for the mono block display coolness factor)

The Crimson 275 can most assuredly be configured mono.
https://www.youtube.com/watch?v=Lb2NHT2MbYA&t=66s

Another BTW;
I seriously considered buying two Crimson 275's and running them mono blocked, then decided against it. Why? At this point in my journey, I am all about simplifying things, not making them more complex. A mono block set up would have necessitated getting matching stands and re
arranging my listening area to accommodate them. It would have required more cabling to connect them. It would have doubled the number of tubes that had to be monitored for changes. And finally, I really don't need 150 watts per channel.