Great comments Macedonian hero.
I too changed to the genelex ECC88 tubes soon after getting the Lyr because I felt that the amp needed a little more air and midrange detail. I have recently changed back to the stock tubes and have discovered that the stock tubes seem to develop more top end after a longer burn in. It is quite hard to do back to back testing as the tubes are reasonably difficult to swap out combined with the cool down and warm up delays but I think the stock tubes have a little extra bass.
Do you find similar or am I just loving the Lyr in all combinations?
I'm thinking I prefer the Genalex Gold Lions. I find the bass a (to my ears anyway) a bit more/deeper bass and warmer mids. Overall I find them just a bit more "musical' and "tubey". The stock tubes do sound really good, but come off a bit clinical. I will need to burn them in a bit before passing final judgement on them. (My Genalex tubes already have about 50 hours on them from my WA2).