My search for an excellent new production KT88 tube has at least for now ended...these Genalex Gold Lion reissues are the real deal for sure. I have owned original Genalex Gold Monarch KT88s, and have run Sovteks, Penta Labs, and Shuguangs for new production KT88s. Up until now I've felt the Penta Labs KT88s (the "SC" version) gave the best balanced sound. But, they had reliability problems, and now they are apparently out of production for at least a year, unavailable. So I tried some of the Genalex reissues. Very glad I did. For my money they are by far the best KT88 I've yet to hear. Gorgeous, detailed midrange, liquid highs with tremendous extension, and tight, natural sounding bass without a hint of looseness or flab. Truly awesome. The original Gold Monarchs were closest to what I'm getting with these reissue tubes - they had an equally wonderous midrange but were much looser in the bass and much more artificial sounding on top. Not to mention being like $600 more expensive. So in my view, not much of a contest. You can see my equipment in my profile - suffice to say that I have strived in my set up for transparency and neutrality, so tube choices make a very big difference to the overall sound of my system. The other tubes I listed were nice but nothing compared to these. Anyway wanted to pass on the word and I'd be interested to know if others run these tubes.