Leben CS600 owners, what tubes have you rolled?

Neil,
On my setup, the Reflector 6n3ce tubes are very well balanced tonally and are the exact replacement for the 6L6GC as far as setting go. If you are using Sovteks now you will notice a much more smoother treble and midrange and the same bass slam as you are used to.
I have heard the SED 6L6GC and not the RCA black plates and the reflector is far better.For the price the reflector option seems like a very good bet as they are not expensive..you can always keep it as a backup.

Another option is the Tung Sol KT120. I still am awaiting mine to roll to see the difference but they are supposed to be much better (let me check to see where it is better and by how much)

The power difference will be quite large between the 6n3ce and the KT-120. Not even close. I wonder if a reasonable comparison can be done under such circumstances.

The KT-120s are the best I've had in my CS600 to date. Easily besting the 6n3ce.

OK. I have the KT120s running past the 20 hr mark and they are outstanding. especially around both High Freq And Bass
the first 1 hr they were horrible and the treble was almost screechy..but then it started opening up.
the articulation in the bass as well as the clarity in the highs really standout, I believe the 6n3ces have a great Midrange as well so i am not able to notice too much of a jump there..but in a couple of days will put the 6n3ce back just to see the difference
At this point they are a big thumbs up....and you can safely upgrade and give the 6n3ce's a pass.

I appreciate all your responses. Arj, please give us an update when more burn in time happens on your KT120s. Notec, what are some of the tubes you have rolled? Thanks Neil