I currently own the Viva Aurora 845. I received them shortly after the January CES in Vegas. I sold a pair of the Viva Aurora 572 to buy them. The lower powered Viva Verona amp is no longer manufactured, at least not for US distribution. One friend in my group has compared the Viva to a WE 300B based amp and said that the Viva was better. I know the Cary 845 is not in the running against these, and I doubt the Nagra (dual 845) is either. I cannot absolutely say with the Lamm. Although I heard the Lamm at the CES, and was not impressed, this is poor experience to compare against having owned the Viva's for over two years. I can say that I am not a fan of the 6C33C that the Lamm uses as an output. It is also safe to say that the Viva is one of my most favored amps, and I have owned many of the highest end amps made. The (current) final decision about what to use in my own system is being performed with the Viva as a finalist.
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