Suggestions for a tube pre and power amp

@agbrace Thank you very much for explaining the sound characteristics of LTA preamp. Will keep an eye on LTA preamps.

You are correct with Coda input impedance of 10K ohms for balanced  will work well with 50ohm impedance of LTA. One reason I avoided LTA in my initial list is lack of balanced connections. I am really not sure is that is a wise decision or not.

@lals I don’t feel that its single-ended only output is a limiting factor, it is a very nice component and reasonably priced given its performance. I have been through a ton of gear and currently have 3 other preamps at the moment, all solid state, and it can easily hang with them. Levinson 523, Classe Delta, and an EMM Labs PRE2. 

OP - while generally I agree with the quality recommendations of Audio Research preamps, I have heard fabulous things about Backert preamps. making two changes at once can be tough though as both amp and pre- will have different break in cycles if both are new. So that throws a huge number of variables into the mix. 

I'm not familiar with your Luxman, but if it has pre-amp outputs, you might want to start with the power amp and get that variable set before moving on to the pre. Just my 2 cents worth

Have had Pass X250.8 driving Revel Salon 2 for several years. Room with big volume. Amp NEVER leaves Class A mode at loud levels!  Preamp LTA MicroZotl, 

great synergy. You can’t go wrong with these items. 

Your Revel speakers are good enough for a tube power amp. They are 91db and 8 ohms which is great for tube amp.About preamp - I wasn’t a big proponent of changing preamp vs power amp. I thought power amp will give you bigger improvement over preamp. This was until I put my new preamp WAVE tube preamp from Audio Mirror (currently at 20% off) in the system. I am not exaggerating, but it was a WOW! Everything improved. I’ve got bigger soundstage, more details and less grainy sound.  Improved immediacy and dynamics. Improved imaging. In my case live and natural representation, the feeling like you are in front of  musicians or like you are in the studio. Music became more airy and easy flowing. I sat and listened for hours and I was re-discovering music I know by heart. Of coarse I am talking about tube preamps. Design is very important. Don’t go for preamp with many tubes involved. This is a wrong understanding than the more is better. It is quite opposite. Look for good sounding tubes, capacitor-less design and high quality parts. High quality parts are bringing the refinement and microdetails in the sound. They can shape the sound too. They require longer brake in time, but the improvement is worth. In short a good preamp can bring big improvements if chosen wright.