Tube amp suggestion

I drive my B&W 804S with McIntosh MC275 and love it. I tried biamping with a Rotel RB1080 that was replaced by the MC275, but believe it or not the 275 had better bass than the 200 Wpc Rotel...go figure! Sold the RB1080 and run the 275 full bandwidth.

Maybe the 805D is different...but the 805S wasn't fit for biamping the way you seem to describe it, because it had only one set of binding posts. Did you mean tubes for top end and SS for bass? The 805D has a tweeter and a midrange...sorry, I don't mean to be a pest, but are you sure?

Anyway, try to audition a 275 with 805D. I'm sure they sound really good.

Almarro also has a beefier tube amp that may be good.

@Lewinskih01 to answer your question, yes the 805D's have two sets of binding posts. As far as tubes for top end and SS for bass? I really don't know, as I said before, I don't know enough about tubes to know what to do, go tube amps for highs and lows or tubes for highs and ss for lows.
Also, budget is also a consideration.

I'd say try to audition an MC275 with 805D. Might not be that difficult as many dealers carry both lines.

Again, with my 804S the Rotel didn't provide better bass than with the MC275, so don't assume SS will outperform tubes ALWAYS.

If you can swing it, get the tube amp you choose, play a bit with biamping and decide which way to go. I chose for a single amp and upgraded the preamp with the sold amp.

To properly biamp you will need an external crossover, plus an extra sets of ICs and 2 extra power cords...and the extra amp, of course. Is it worth the extra cash? Your ears will tell you. In my case I went for better electronics, but YMMV.

I hope it helps.

Maddog,
When you say, "my cables are already set for biamping", what exactly do you mean? Do you have 4 spades per channel at the amp end and only two per channel at the speaker end? Re-termination should be a minor concern vs. your other questions.

Yes, you can add some warmth by using a tube preamp w/your ss amps. This is a common step many in your shoes take. But that won't do what a good tube amp will.

IMO, simplifying with one good amp would be your best bet. Yes, it does need to be capable of driving your speakers and best way to get a handle on that is too post a thread titled "What tube amps go with B&W Model XYZ" etc. People who have experimented w/that will reply. Cheers,
Spencer