So did you read Occam(Paul Kaplan's) comments? Paul owns the Ncores.
I'm a poor choice for poster boy to promote any specific view....
Yup, I've had my Ncores for nigh on 2 months and am not totally happy with them. But that is by no means a criticism of the product, but an acknowledgement that optimizing a system is hard. It took me 3 months to truly be happy with my EAR Acute CD player. It took many iterations, a gradient search if you will, to come up with a proper combination of tubes and isolation that worked (for me) when powering my Aksa Lifeforce directly. I ended up with Siemens PCC88s with Herbies Ultrasonic SS dampers and Stillpoints for isolation. Anyone familiar with the Siemens 'sound' would opine they're anything but warm and cuddly. It also tells one that (assuming the cabling is neutral) that if my goal is neutrality (with a scootch of warmth) that the Aksa leans towards a warm sound.
Given that, it shouldn't surprise anyone that substituting an off the cuff implementation of the Ncore 400s for the Aksa Lifeforce isn't going to be optimal from my perspective. The only thing I concluded from this is that the Ncores aren't as subjectively warm as the Aksa. So I'll change out some of the internal wiring in my Ncore build and try some other tweeks. I'll try different PCC88/ECC88s and compare them with different tube dampers in the EAR cd player. I'll swap isolation devices using Stillpoints, brass cones and BDR cones.
And then I'll go about re-integrating my CAT SL-1 preamp as I miss my vinyl playback, which will be yet more grief. Frankly, if I didn't manufacture balanced interconnects, I'd wouldn't have bought the Ncore. But I do, and the Ncore is an excellent choice.
For those of you who can pick one (component, cable, etc...) from column A, one from column B and get a system that satisfies your needs, good on ya. It took me 4 months to get my Marten speakers performing the way I wanted. It certainly doesn't upset me that optimizing my system for a new amp doesn't happen instantaneously. Its never worked that way for me in the past, and I don't expect anything different in the future. YMMV