Hi All, I've been running my ARC monoblocks for AGES with a duff tube in one (darn). I have Grove Tubes Ei KT90's at the moment. Looking for a sensible priced set (I'll need two matched sets of 8) of KT88's or KT90's. What would you recommend? I drive very large speakers Mirage M1's so need a fair bit of power. Due to needing 16, I'd prefer if there was a low failure rate! Thanks, Tim