High End Integrated Choices

The only thing I would worry about with the BAT supertube is being beholden to BAT and not having any swapping choices. But great integrated. Have considered the move myself. I would listen to the complete opposite end of that spectrum, something like the Cary 300-SEI (or SLI-80 for tube swapping possibilties) just to make sure it's really what you want.

You will have zero problem driving 805's with the Mac. If you ever have any doubts about amp to speaker, look at the tranformer. If it's heavy, it will work. If it's not, it won't. Usually it's multiply by 3 to compare tube watts and solid state, but I have never heard of any probs with the 2275 driving anything. Ever.

I have heard them with a pair of Revel's M20s which a lot of people think are more difficult to drive than the 805's. But again, you know, you'd have to see if it suits you. But I would bet yes.

Love the new JJ Tesla's, and Groove Tubes makes the Mullard EL34 reissues, as well as the early rock n' roll/country r&b GE 6V6 that everyone is so in love with. I like the SLI-80 for it's versatility most, so I'd be tempted to get a few different types.

KT66's have less power than the 88 or 90, and 6V6 and EL34's are different again, but all should have enough to power the speakers. The transformer is your real issue, not the power tubes, and the transformer is top notch. Slope and type of power is more important with the input tubes and inverters, it won't affect wattage as much.