Seeking Feedback from Leben CS-600x Owners

Hi,
this is a terrific amp full of nice timbre, acepting either el34 or 6l6. I have heard it with Blumenhofer Genuin FS2, FS3. I will have a listen to them again this week some time when i visit my dealer friend so i can give you more details about any additional matchings.

I owned a CS600 and currently have a CS600x in my office system. The Cs600x is better in every way but read up on the cs600 for speaker matches, its just a better and improved version. To me it seems to have more presence and snap. Maybe some power supply improvements, but it isn’t so different that speaker recommendations that were applicable to the 600 no longer apply. I enjoy Devores with the Leben but I have also connected it to my Wilson Sashas and it did a surprisingly good job, just a little loose in the low bass.

Thanks for both responses.  I'm considering pairing with Devores although I've heard that the Leben may not have the most "tubey" sonics.  Does that ring true with you @ghasley ?

What do you mean by tubey sonics? It is rich and musical, responds to tube rolling and yet, it isn’t a set amp. It sounds right to my ears but YMMV. 
Side by side with say, a Primaluna dialogue premium integrated with el34’s it sounds more powerful than the PL on ultralinear and more rich than the PL on triode. The 600x controls the bass where you wont miss the ss control and yet, the mids and top are undeniably top notch tube sonics. But dont confuse it with an overly euphonic kind of amp but an overly euphonic amp is usually deviating considerably from optimal performance. Big round tone while being faster than most el34 tube amps. You really should go listen to one on several speakers. Its worth the money to travel to do so. Besides, even if you fall in instant love, you will have to wait for yours given the backlogs and the wait typically experienced when buying a Leben. They hand build them and demand exceeds supply, even during a pandemic.