I'm a jazzman, but do Mozart, Vivaldi and their friends quite often. I'm driving 101db speakers with 40 SET wpc. My speakers never drop below 6 ohms. I get all I need from the Brandenburg Concertos to Stravinsky's (some serious SPL) Firebird. I cannot imagine stella satisfaction with an 845 tube with 88db speakers. I would always be yearning for more when playing big symphony music. I would think in terms of more sensitive speakers, then hook up with an SET tube 845 amp/pre. It works for me.
warren
warren