I like KT90 tubes on my Cronus.
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I am currently using EH Kt-90's in my Atlas ( magnum upgrade) and the results are outstanding. My friend swears by the Gold Lion KT-77's in his Atlas (magnum upgrade) I like the KT-90's because of the added weight and authority you get with the extra power they provide, I am able to drive my Clements RT-7's (big floor standers) with ease. Not only do the KT-90's have the added bass authority, they are also extremely detailed and extended in the higher frequencies. This weekend I plan on getting some hours on my Gold Lion KT-77's and then doing some comparisons
I replaced all the small tubes, with the guidance of Nick and Mark at Rogue Audio, as follows : an RCA 5814A in the center gain stage position, a pair of GE 5751 "Goldpins" in the 12AX7 slots, and a pair of GE 12AU7A's in the 12AU7 positions. All tubes are "NOS." This change in the five small tubes created a very beautiful improvement in the overall musical presentation of my system.
So, with all this in mind, and again with the guidance of Mark O'Brien, I'm seriously considering the Genalex Gold Lion KT-77's.
I use the KT90s in my Magnum version, so take this for what it is worth , might want to try the Black Trasure 6CA7 in place of the EL34/KT77 - I sawpped a quad of BT KT88s in my Ayon Spirit 2 in place of the very good Gold Lion Reissues and they took the sound up a several notches - don't know if their 6CA7s would have a similar effect