The KT90s sound more neutral, more like good solidstate. But they're still natural sounding, like most any tube. I like them. KT88s sound to tubby to me. Plus I like the little extra power of the KT90s. I'm staying with the KT90s.
6550 to KT88
I switched out my EH6550's to JJ KT88's yesterday in my Rogue M120's, quite a difference from the get go...much better bass, sound stage is wide/deeper and overall I like the way they reproduce the music better... so now I'm wondering if the KT90's will be any better? Anyone go from the 88's to the 90's and stay with the 90's? Thanks for your comments.