I have been extremely happy with my GL KT-77's. I'm just thinking ahead, as we all know (or am I wrong ?) that power tubes should be replaced every four years or so. Should I be proactive and replace them in a few months, or should I wait for a tube to fail ?
Tube recommendations for my Rogue Audio Cronus ...
First set of big tubes were the original stock Svetlana EL-34's. After three years, I replaced them with a beautiful sounding quad of Genelex Gold Lion KT-77's. It's now three and a half years with the GL's, and I need to start thinking of my next set. What are your ideas ?