Beside the popping how does it sounds with the hd800? I've been considering the hd800, what tube did you use them with?
The lyr hasn't given me any problem so far and enjoyed them with the he400, he500, k702 65th, and even with d2000 even though they are said to not be used with easy to drive headphone. That's my limit though, I don't think I have the guts to try something like the esw9, maybe one day I'll plug in the m50 that my brother has since its cheap.
I was mostly listening with what I felt were cleaner sounding tubes such as Telefunken and Siemens. The best results I had were with a fantastic pair of Siemens 7308.
I felt that the Lyr sounds great with the HD800, but it is not the best match for me and indeed the HD800 will show a lot of the Lyr's limitations. The Lyr's noise manifests itself in a kind of gray background and of course the popping is scary. The Lyr is high power amp and I like it better with the HE-500 etc.
The HD800 certainly do live up to their reputation as being difficult, but when they are well matched they are spectacular and unparalleled among the phones I have heard. In my case I am not certain I entirely like their sound, but once you have listened with that level of resolution it becomes difficult to go back.