Anybody tried KT120 tubes on Conrad Johnson amps?


I use a pair of Conrad Johnson Premier 8A mono blocks. I was using Svetlana 6550 tubes on it, I switched to Tungsol 6550. Then Tungsol announced KT120s. Tungsol says it is suitable for 6550 users, but CJ says use only 6550s. Did anybody have an idea?
john_kns
I have been using sed kt88's,and have also tried golden lions in my premier 12's.I noticed very small diferences between those brands.I installed kt120's wow!bass has explosive dynamics,very natural and effortless, a much greater sense power and ease the sound stage is now deeper and wider,midrange is also expanded and more musical the top end is at least on par with kt88's.differences are dramatic I am extremely impressed