Received the ol' mouse ears today from that ebay listing the other day. I like it, kind of a lot. I will run it for a bit before I decide if I like it over my JJ 6SN7 that I was running previously. As of right now, they are pretty close sounding to me, but after running for a day or 2 we shall see if that stays the same. This thing doesn't have much glow, but it has glorious sound for sure. One thing I did notice right away, schiit in gets you schiit out for sure. My good sounding tracks sound amazing. My crappy recorded tracks sound, well like schiit. Probably enjoy Diana Krall through this tube more so than any other tube I have tried to date.
EDIT: How do you figure/find out the production year of these mouse ears?