I don't get all this 'B&W- no good with tubes' nonsense.
Your 805's will flourish with a nice tube preamp. They're fine speakers that will sing in many systems. While the Rotel amp isn't the last word in sonics, it'll do just fine with a good, not so expensive second hand Conrad Johnson preamp. PV8, PV11. An Audio Research LS2 or 3. Maybe even a used Doge 8 Clarity if a remote is necessary. Just sell the Rotel pre, put the few hundred toward the new used pre and you'll never look back. Your preamp was the weakest link in this mix. Then down the line, flip the amp for a better SS amp, but you may not feel you have to, so one step at a time.
Your 805's will flourish with a nice tube preamp. They're fine speakers that will sing in many systems. While the Rotel amp isn't the last word in sonics, it'll do just fine with a good, not so expensive second hand Conrad Johnson preamp. PV8, PV11. An Audio Research LS2 or 3. Maybe even a used Doge 8 Clarity if a remote is necessary. Just sell the Rotel pre, put the few hundred toward the new used pre and you'll never look back. Your preamp was the weakest link in this mix. Then down the line, flip the amp for a better SS amp, but you may not feel you have to, so one step at a time.