Beautiful and intriguing system, florianw, I'd love to hear it. Coincidentally, I have Apogees (1-ohm Scintillas) driven by tubes (CAT Statement monoblocks) and an Acoustic Signature turntable (Final Tool II). It's a small club of people driving Apogees with tubes, to be sure!
What are the blue lights at the bottom of your speakers? Looks very cool, but I know there's more to it than that.
Richard