Leben Hi-Fi Stereo Co. CS-300x (S)

I bought this recently to see what all the buzz was about with Leben. I understand now! These are great with speakers and amazing with headphones, but I need a bit more power with my particular speakers. So selling this to try the more powerful CS600.
This is the CS300Xs, 15 watts per channel. There have been a couple versions of this. There was a 12 wpc version with Sovtek tubes, a 15 wpc version with various upgrades and Mullard and GE tubes, and then when Mullards became harder to find for a manufacturer, the CS300Xs came out, which is the upgraded version but with Sovtek tubes. This is that version, but with the upgraded Mullards and GE 5751 tubes. So this is the best CS300 version. Simple, right?
It comes with the Mullards and GE's, not the Sovteks.
I am not the original owner but I was told it had low hours as it was only used in a part time residence.
Sounds great, very quiet even with my ear a foot away from the speakers. Superb detail and musicality. When I first heard it in my system I thought I would never sell it, but the thought of this sound with a bit more power sounds very enticing and I see there are a couple of the more powerful model available...
Original box is in fine condition.
There are a couple of marks on the rear of the side panels which are only surface scuffs, not gouges. They are smooth to the touch. In the picture they appear to be gouges but they are not. A little stain should take care of them! Asking $2100 or best offer. Free shipping at price listed conus.