I think Skylab is right... BUT... you have to burn the JJ's in with music for about 120 hours before they open up and perform like they are capable of doing. If you are making your hard fast "give up on 'em" judgment before about 120 hours, you are missing what the JJ's can do. Different tubes require different break in time... just as amp circuits are different. But, my general rule over all my years with tube amps, and even with solid state, you should burn in with real music... especially "Big Band" type with all those horns.
I have the Gold Lions and the Schiit 6N1P's coming tomorrow and the day after. I'm anxious to see what they can do against a burned in set of stock Lyr's.
By the way, I was quite disappointed with the Lyr at 100 hours, compared to my Little Dot Mk IVSE, driving my HE-5LE's. But, at about 115 to 120 hours, the Lyr suddenly became a different amp... a good amp! I'm anxious to see how it compares with these next two set of tubes.