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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The NOS Sylvanias Chrome Domes are mucher better in my system than the Sophias, better seperation, sharper image, deeper/wider soundstage and more ambiance at a much lower price.
I also forgot to mention that the Mac custom copper umbilical cord sounded more refined with better placement of images and draws you further into the recording. The Truth cable was not as accurate and adds bloom to the sound, which I didn't like.
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.