Audion Black Shadow, in my case driving Zu Definition 2. Against Mastersound, Viva, DeHavilland, Cary, Nagra P-P and others, the Audion consistently reveals more of what's in your recordings, more convincingly than other 845s -- though it's hard to go wrong with nearly any 845 SET amp.
Nagra VPA mono blocks driving Sonus Faber stradivari speakers and Art Audio Clarissa driving Ref 3A Grand Veena, were two systems that I enjoyed listening to.
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