I’ve been running a Pass x250.8 with great results. I’ve also tried the Black Treasure CV181’s ( 2 different pairs) in my LS-100 and have nothing but noise after a couple months use. Now have a set of Psvane CV181’s running which are almost as good as the Black Treasures, but are starting to get a little noisy after just a few months. I’ve gone through the old rectifier tube that was in when I got it in May of last year, plus a new one I replaced the old one with. This also blew the Synergistic Red fuse I was running in it. I’m done playing with tubes. Just the other day I bought an Ayre K-1xe to replace the Modwright. It arrives Thursday.
Good luck in your quest.
Good luck in your quest.