Cary V-12 using KT-77 tubes?

I have owned Cary V12 amps for quite a while and I've always felt the stock Ruby EL-34 tube's sound the best. But the Ruby tubes still will not be available till sometime next year and I need to do something soon. The latest tip I received was to try Golden Lion KT-77 tubes. I have heard reliability has been an issue with these tubes in the past but with the Golden Lion current version they are much more dependable? I did check with Cary Audio and they gave the okay to use  KT-77 tubes in the amps. Has anyone had any experience with those tubes in this amp?