TADAC owners - which best 12au7 tubes?

TADAC owners. Which 12au7 tubes have you /tried used to replace the stock chinese tubes?
What has been your listening experience with the ones used?
Which tube do you find gives the best performance?
Your comments are appreciated!
I have some RCA blackplates that have made a big improvement over the stock chinese. Another very nice tweak is the Herbie Audio Lab dampners. I now have a much cleaner top end! The preamp ultrasonic 9's. You have to cut them in half though so they can sit on top of the tubes.
Mazda (RT/RTC) are all incredible, across all types. It's uncanny really. I have some square getter wing plate 12AU7s I can't wait to roll into my new DAC.
I am using black glass Tung Sol's, sound great! I tried them after first trying standard NOS Tung Sol's which sounded so nice and clean, I figured the black glass variant was worth a try. Yes very nice vocals and clean sounding!

I noticed after getting rid of the stock Chinese tubes that the Tubiness knob was clean sounding through all it's range, and not distorting as it was with the original tubes.
I recently sent mine in for service (my fault, moving) and Paul replaced the chinese tubes with EH 12bh7's. Much, much better even out of the box.

I tried some E80CC's from Brent Jesse, but the TADAC didn't like them (tubes kept shutting down), and just traded them for Telfunken rib plates. Don't like them at all out of the box. Edgy sounding, and not as sweet and airy as the EH 12bh7's.

I'm new to tubes, and it seems the Tele's might need a bit to break in....
Hard to beat the Mullards and Telefunkens!

I believe the Mazda's are Mullards as well....

I have been using the Mullards for a couple years now and liquidy Mullards are a perfect fit! The TADAC is hard to beat for the money...........