Coincident Frankenstein MkII - very good sound in all parameters. The manufacturer is not the best to deal with, but sound quality here I must say is of the highest note. You can still improve by asking for caps upgrade before ordering. It drives 89dB speakers to quite nice levels, but I wouldn't use them with large drivers, 10inch max. With bigger ones, it lacks attack and dynamics. Depending on your speaker character, you can play with 300B tubes, the WE300B replica from Psvane is marvelous, and gives incredible details and mids. The Takatsuki TA300B is slightly more balanced (again, will depend on speaker and/or your taste) and gives better bass. The Psvane black bottle does very well too. A good preamp will obviously improve these SET quite dramatically. Although I usually prefer to pair transistor/tube preamp/amps, I have experienced that they match perfectly with their cousin, the Coincident Statement Line.