I just switched the V8L and V10R tubes, and the V9L and V11R tubes. I've pushed it quite a bit harder since swapping and still no distortion. I'm going to pick up a MixMatcher II and test all 4 tubes. I'm also going to buy a spare set of KT-88's to keep on hand.
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Living Rm: O/96, REL S/510, MC275vi, C2700, MT5, Lumin T2, Jay's Audio CDT2-MKIII
Family Rm: Elipsa, A-48, C-2450, DP-430, Auralic Aries G1, Denafrips Venus II
Home Office: KEF LS50, Schiit Vidar, Modi-Multibit, Sys, Loki, REL T/7i
Home Gym: KEF LS50W-II
Office: ZuAudio Dirty Weekend, BluSound Powernode, Schiit Mani, Fluance RT85, REL T/5i
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