Aric Audio Systems Unlimited Preamp

The review of the Super 211 SET is live on 6 Moons:
https://6moons.com/audioreview_articles/aric/

I have a question for you folks that are running The Unlimited. What regulator,rectifier tubes are you using,and how do they sound? I've had my Unlimited for about a year and a half,and absolutely love it! 
I would like to keep some extra tubes on hand,and curious what others are using. 
      Thanks,
            Ray

I'm very familiar with it as I had one for some years. I still have it actually, I have just moved on to his Special 6SN7 Linestage which is similar, except it's purity times 10. It now leads the charge and no one is looking back.

Hi Ray, I'm using a NOS Sylvania 5U4GB (Black Plates) which I have come to believe is a wonderful discovery as it transforms the whole presentation into something nearly magic. I don't know why. As far as the regulators go, truthfully, I haven't noticed a marked difference between any of the types I have tried. The rectifier tube seems to influence the delivery far more than do the regulators. My opinion only.

Thanks for the response tubepower. The Unlimited uses a 5AR4 rectifier. I'm wondering if that variation will yield similar results as the Sylvania 5U4??