wisnon ~ Yes I understood what the OP was asking but since I had some experience with a tubed DAC (and also an AYON tubed dac) I just threw in my 2 cents worth. And while the BIG6 was wonderful I'm sure the more expensive Lampi's sound better, they should but I never heard one myself so can't comment. Also the OP didn't ask about tube size so the age old question remains....does size matter!