Sony SCD XA5400ES tube rolling?


Just got my player back from Modwright,fully modded with the ultimate upgrade. Wow! incredible difference over the stock player even cold out of the box.

Now the question, anyone have experiences with tube rolling with this player? The stock Russian Tung Sol 6SN7s are supposedly fine, but I decided to order some KEN RAD WWII military (VT231)tubes and see if there is a big difference in sound. In the mean time, awaiting their arrival... comments are welcome.
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Jwm,

Myaudiocables.com is the site and they build custom umbilical cords. I have the pure copper version but will upgrade later to the liquid magic ref cable. lookup Audioman58, he knows alot about these cables.
I just read the exceptional (balanced, informative, non-hyped) review in july Positive Feedback. Where is best source to buy mullard and sophia tubes, and for a tube rolling neophyte is there a particular version/flavor/spec of those i should gravitate to or from? Thx in advance.
I enjoyed the review also. You can buy the Sophia tubes directly from Sophia. The NOS Mullards are getting pretty hard to find and pretty expensive. E-bay is an option for those. The listings there now are kind of disappointing.
I bought the NOS Sylvania Chrome Dome Bad Boys. Didn't even make it into my Sony player yet because they took a detour to my VAC 300.1a amp. Holy Toledo! They sound awesome. Added some heft, low end energy, space that wasn't there before. Now I need to find two more for the Sony!