Choosing between 2 preamps

I'd pass on both and consider the Audio Research SP-14 that's listed on eBay right now for $1400.00.  Especially since you have an Audio Research power amp.

I don't have a horse in this race, and I'm not getting anything from the deal, but this sure looks like a great deal on a preamp that's definitely top-tier. Stereophile said 

'In my opinion, the sound of the SP14, via line or phono, will set new standards for the industry. I can see other companies using the SP14 as a benchmark by which to judge their own products—it's that good. It is user-friendly and attractively styled, injecting its unique form of magic into the reproduction of music to a degree I've rarely experienced before. I feel it should be included in Class A of "Recommended Components." It is a very special product."

@panzrwagn my amp ihas only xlr inputs.

Got the Atma Sphere mp 3 mk3.2.

thinking about putting Gold Lion 12au7 for 130dollar or

CBS hytron 5814a 12au7 from 1960 NOS 200$

Any experience with these Tubes?

also suggests for 6sn7gt that not too costy?

You might consider everything from Modwright, all hand made to the highest standards….you can’t go wrong…

Friend has the VK-31SE and inspired me to buy a VK-33SE ... both excellent...but yours has been modified so probably no one here has a clue how it sounds...