Jimborjrib ,- all in the for what it is worth context - I have a Cronus Magnum with the KT90s. I haven't tried the KT77s in this amp or EL34s for that matter,had another amp that accepted EL34s and although I prefer a somewhat warmer sound the EL34 wasn't to my liking. While you didn't ask this, for comparison purposes the old Lion KT88s I use in my Ayon Spirit 2 are a warmer tube than the KT90.
What 12ax7 and 12au7s are you using? My Cronus came with Sylvanias, after awhile I switched in RFT 12au7s and Tungsol 5751s which to me gave a warmer touch.
What 12ax7 and 12au7s are you using? My Cronus came with Sylvanias, after awhile I switched in RFT 12au7s and Tungsol 5751s which to me gave a warmer touch.