VTL 2.5 Preamp Tube Suggestions.

I hope that the other owners of this fine preamp could offer suggestions for upgrading the stock tubes.
It uses 2 12AU7's and 2 6350's in the linestage section.
3 12AX7's in the MC phono section.
Thanks for the always helpful advice.
Bugle Boy 7316 for the 12AU7 were the best I tried in my VTL IT85 (which is a combo of the 2.5 preamp and st 85 amp)
I can't speak for the phono section but after a few tube swappping sessions I found some tube magic with the Mullard Miltary spec CV4003 and Electro Harmonix 12AT7 combination.