Update, since I KNOW people around here care deeply about my gear: I scored (obtained?) a supposedly barely used (made in Dec. 2016) Dennis Had Inspire Fire Bottle SEP amp to pair with my 93db efficient new Sonist speakers. New AQ biwire cable also. The amp sports (!) new Russian Gold Lion KT88s, an Amperex 6SN7GTB driver tube and a JJ 5Y3 S rectifier. I had been put off by the tone of the new Sonists to the point of dismay…lack of air in the treble maybe…but YOWZA…the Fire Bottle fixed everything, kicks it at any level I can stand, and is the bargain of the century (such as it is). It’s a small miracle, and hey…I’m an atheist! The Sonists (Recital 3s…their "smaller" floor stander) sound clear as a bell, the mid issues (especially piano…I’m a piano freak) are gone, and seriously…hats off to Had. Anybody know if the 5Y3 tube allows use of KT150s? Please post the answer immediately. I have some I want to try in there although the amp sounds great as is. Also, to stay on topic, I took the fuse out, cleaned the contacts (they looked clean…but hey…I care), and replaced it with itself in the now antiseptic fuse holder. And there ya’ go.