Suggestions for a tube pre and power amp

@jw944ts  Thank you for sharing your system details. Good to know that it is never leaving Class A in a big room with Revel Saloon.

@lals Right now I just have the Coda, an Accuphase A–75, and a Luxman 595 integrated. Speakers are Magnepan 3.7i and KEF Reference 1 Meta. Very difficult to say which amp is best, I rotate things in and out, system synergy and amp to speaker matching I have found is very important. Source is an Aurender N200 and EMM Labs DAC2X V2. Somebody else mentioned Audio Research and Pass, I have had that combination and that is a very nice sounding pairing also.
I’m interested in a pair of Revel 328BE how do you like those? I had a pair of 228BE and unfortunately had quality control issues from the factory and the serial numbers for left and right were so far apart, nine months manufacturing difference I could never get the speakers to image very well. I liked their overall tonality, but would be picky to find another pair. 

@kevemaher I have also seen the measurements in ASR. I was not able to understand the significance of low phase. Coda amps are high current amps but I my mind was inclined to Coda S5.5 but some suggested to go with No8.I need to find out the perfect match.

Revel generally paired with ML gears in shows. and they seems to be perfect matching.

lals

I own both the CODA S5.5 and Aric Audio Motherlode XL preamp, and can confirm they are a brilliant match. I have no problem running several different speakers: Clayton Shaw Caladans, Buchardt Audio S400 MkIIs, 1990s Infinity Kappa 7s, Thiel CS1.2 & CS 2.3, and any number of speakers I've borrowed. The Infinity and Thiel speakers are not easy to drive either.

The CODA S5.5 may not be the most powerful option, but the new type transistors it uses are beautiful. It delivers 50wpc pure class A, more in A/B, and peak power delivery is 100amps.

Give a call to Doug Dale at CODA and to Aric Kimball at Aric Audio; they are both great to talk to, and quick with an honest opinion.

@porchlight1 To be honest I am looking for 3D holographic sound and high level of clarity. I am not very good in describing my preferred sound. 

Luxman 590Mk2 is Class A 30W @8ohms and then it switch to class AB. I never felt power is less but with bad recording I may prefer a little warm presentation. I can try what you suggested, Luxman can be used as a preamp alone as well as a power amp with separates switch. 

Other question I have is it really needed to go with balanced output or single ended connection is good enough? 

Thank you.