Best 12AU7?

I used the Brimar 13D5 several years ago and loved them.  In my SET, they were very clean and clear without being bright.  I had the RCA clear tops prior and the Brimars were in another league in my opinion with quite noticeably more detail.  Some have said they are a bit warm.  I did not hear that at all but I did not hear any leanness either.  Images were also more distinct.  They are just a great tube, if your sonic preferences reflect the qualities mentioned.  

I have a pair of Telefunken 802S Platinum Matched Pair Best 12AU7 for sale. Please reach out to me.

Telefunkin ,Siemens , all very good nos tubes from Germany 

I use 12au7 tubes in my DAC... have tried LaRadiotechnique, Brimar CV4003, RCA Clear Top, Telefunken amount others. These are my (4) favorites for sure but right now I have the La Radiotechniqe in and they seem play best with the particular speakers I'm using these days. These were never imported into the US so if you can grab a set, go for it. Not overly expensive either but really a spectacular presentation to to bottom. French tubes have a personality all their own. Just my opinion 

I can also vouch for Radiotechique. I am running the equivalent version produced for the French military, the 6189/12au7 in my Rogue ST100 and I would describe the sound as "Lush".