What year are your 6n23p? That Vega is one sweet dac! Did you read the 6moons review? Dedicated DsD and DxD chips? http://www.6moons.com/audioreviews/auralic5/1.html
Hey, sorry for the late reply, I was (and still am, while typing this... woops, the music just stopped time to add more ) listening to my LCD-3's with the 1980's rockets, I posted the ebay link where I got it from before on this same thread you can check it out and here's the link just so you don't have to work your way to find it:
http://www.ebay.com/itm/2x-MATCHED-SUPER-STRONG-6N23P-80s-USSR-VOSKHOD-Military-TUBES-PAIR-6DJ8-E88CC-/301115482116
So far: Very warm sound, strong bass presence, three dimensional, treble is sparkling, mid is sweet and lush, schiit load of detail as well.
Still can't wait for the Vega, I'm gonna be blown away.
Also, just yesterday I put some music and listened on my bed with eyes closed, at some point, there was some sound as if a meteorite is falling down and exploding at the end, it was quick, but very very real I was rather mind blown (Hence why Vega with with my Lyr would totally blow my mind )