Zesto Andros PS-1 Tubes

Is this the model which uses 12AU7s and 12AX7s? There has been a lot written in general about rolling those 2.
If it's the Phono Stage then certain commonly tried substitutions may not work. The switch I am thinking of in particular is using in 5751s instead of the stock 12AX7s. In a Phono stage, the loss of gain using 5751s may not be desirable. That does not preclude many other common rolls. If you like your sound clean and strong then vintage Telefunkens might sound good. If you want a rich full sound then older Mullards might do the trick, but they are getting truly scarce. The current production Gold Lion 12AX7s have been prized for their rich full sound.
A really special 12AU7 sub are the uber expensive Amperex Heerlen production 7316s. The Stock tubes are pretty good BTW they seem to like the current JJ803S replica, for their 12AX7.

7316s are very good, if you must use a 12AU7 variant. Amperex BugleBoy ECC82s are the best of the true 12AU7s I have heard in my system.

Jtwrace,
You have a beautiful, brand new component, made with advanced, top quality parts and materials that many would be ecstatic to have. It's like having a new, super hot girlfriend who turns heads on the street, and asking your friends whether she would be better with DD rather than D. I'd myself would enjoy her first just the beautiful way she was before asking for suggestions about improvements, if ever.

Directly on point here, I recently spoke with a successful tube power amp designer and asked him why he decided to go solid state with his phono preamp for a change. He said he was never fully satisfied with the prototypes, and he added that many of his clients who had great sounding tube phono preamps were nonetheless never fully content with the sound and forever continued searching for even better sounding tubes. He offered this was not for him. Perhaps that's something to think about.

06-28-12: Actusreus
Jtwrace,
You have a beautiful, brand new component, made with advanced, top quality parts and materials that many would be ecstatic to have. It's like having a new, super hot girlfriend who turns heads on the street, and asking your friends whether she would be better with DD rather than D. I'd myself would enjoy her first just the beautiful way she was before asking for suggestions about improvements"

Well at least with tube rolling, it's easy to go back.0:)

JTWrace.
The Andros-PS1 comes with four 12AX7 tubes, not 12AU7 as stated by one person above (at least mine did). I have been trying out some Gold Lion tubes for the past few months, and I am liking the results. Fuller sound stage, with deeper bass. The stock JJ tubes sounds great also, but I wanted to see what other tubes sound like in that unit. I am going to try some Tungsol next.