Rolling Tubes in the Atma-Sphere C-30 amp


I imagine there must be at least a couple of people who have experience with rolling tubes in the C-30. Suggestions would be greatly appreciated regarding what tubes to use for the best possible sound and which positions they should occupy in the C-30.
sabai
Clio09,
When you stated ""the front row of tubes" did you mean the row closest to the listener or the row closest to the back panel?
Jeffreybehr,
Are people using 6 Roundplates in their C-30 or are they using a couple of Roundplates with other tubes, as well?
Jeffreybehr,
I have emailed Ralph but I also wanted to hear from users of the C-30 about their personal experiences. Thank you for this very useful information.