Anyone listen to Zu Audio's Definition Mk3?

Morganc,
Do the nano drivers render the Zu more neutral or revealing than the Pendragon ? Was the Frankenstein 'warmer' with the Pendragon(is this speaker perhaps voiced warm?). The Frank`s sound does change significantly depending on choice of 300b selected.I`ve used EH golden grid,W.E. reissue version,Sophia Royal Princess and Takatsuki-TA 300b. Each tube actually makes the Frankenatein sound like a different amplifier.

The Sophia RP is excellent,the Takatsuki is simply sublime!
Regards,

Morgan,

I have the generic shuguangs, but after further discussing the tubes with 213cobra, it appears the "Preferred Series 274B" that tubestore sells for $30 have a stronger vacuum and may be 'better.'

If it were me I would drop $20 on a generic pair immediately and if I liked what I heard, keep them as a backup and get the better ones when I got around to it.

Hi Mrpaul, you're the most recent owner to praise the new Def4s. Mine are to be installed in exactly 2 weeks. They've been out for a pro review, so should be no bedding in issues.
I've bought them blind (deaf?) w/out audition to replace my beloved 2s, so this unanimous thumbs up is filling me with (cautious) confidence.
The thing I am most concerned about is whether there is any loss of the seductive Zu tone dense presentation, with perhaps a move to a more spotlit hi fi type sound.
I would hate it if improved treble extension, midrange transparency and bass control in the 4s led to a hyped up exaggerated presentation I moved away from in the first place going to Zu 5 years ago.
Deep down your comments as well as Phil's and Gopher's should mean this fear is unfounded, but as in so much of audio, new very rarely means truly improved.

Hi Spiritofmusic,

In my system there is no loss of the "seductive Zu tone". If anything it is more dense and fleshed out due to the increased mid-range resolution and improved bass and treble. Instruments sound more natural and realistic. With these improvements I find myself listening to a lot of older, less stellar recordings and enjoying them greatly. I think you are going to like them very much. It's hard to describe how much better they are across the board than the 2s.

Regards,

Fantastic, Mrpaul. Much as I love my 2s, treble was always a conundrum. It appeared to be absent in the traditional hifi style of presentation ie not spotlit at all. Just a wall of highly communicative dynamic tonally rich midrange. Then a percussion instrument or high pitched string would appear to remind me, yes, treble info is there after all, just v. reticent. Bass integration was a real issue too until I invested in the SpatialComputer Black Hole, and now I have less reservations.
It's so reassuring that greater resolution thru the frequency extremes augmented by greater performance of the all-important FRDs are keeping all that is great about the 2s but taking things to a better all-around package.
It's interesting that with me, satisfaction with the Zu sound means that I'm "hearing" the xover in other spkrs, even those at the very high end. Once smitten by the Zu sound it's hard to go back.
These really are going to have to be my final spkr upgrade, and I'm really stoked for a week on Monday!