The Havana has only 25 hours break-in and I'm using the stock GE tube so keep that in mind with my comments.
The Valab was my introduction to NOS digital and it's been nothing short of a revelation. I really love this little unit and it easily beat my $2k upsampling set-up in terms of sheer enjoyment and non-fatiguing sound. I can easily sit and listen for hours on end, unheard of for me before with my digital set-up. So I am 100% sold on the NOS design that is coming out of the far east right now -- it just sounds right to my ears.
I would have to say that the Valab and Havana are closer in sound than they probably should be on paper - clearly in the same family. However the Havana retrieves considerably more detail, has a much blacker background and seems more agile with quicker transients. In comparison, the Valab sounds slower with a flow that you'll probably either love or hate. I happen to love that sound but compared to my vinyl rig or the Havana it just doesn't have the same snap. The Valab almost reminds me of hearing some SET amps -- great presence, very musical and pleasing but tending to be softer and 'slower'. Dynamics are quite different - the Valab has room for improvement in that area. Again, being able to hear my crappy lossy digital files sound that musical is a huge plus in my book and I'll take it over throwing upsampling in my face.
With the Havana I need more time to really get a handle on it's sound but I can say with fair certainty that it's a few steps up from Valab -
Hope this helps --
