Hi James,
Yes, the Vulcan that was designed by Franco, the self biasing one with 6 x EL34s per side. He was working on some speakers called ARS Acoustica (Irving's Speaker) at the time. He sent me out to various shops around town to procure various caps and minor upgrades. I truly think it is a wonderful product when used in the right environment. And unlike it's reputation I have had zero problems, other than to replace a couple of 5965s.
With the 63s it is pure magic, the transient attack almost perfect. The clarity and ability to see into the soundstage was fantastic. I'm not a huge cable juggler but I replace my XLO speaker cables with Vovox (a little known product distributed by Tosh from Divergent) and I was a very happy camper. The other components in my system are the MFA Luminescence, Versa 1.2 with Grasshopper, Modwright SACD/CD player, Magnum MD-108 or Marantz 10B.
So why upgrade if the 63s were magic. Well it's the old quest for the holy grail, if 4 panels sound great then 6 would be even better. I'm not convinced I may not be able to achieve this but I think I may have to rethink the location, partnering equipment, et al. My major problem now is that I like the scale, but my objections are similar to those when I had stacked 57s; more of everything but a loss of focus and some of the magic. I know I'm being premature in making my judgements but these are my initial impressions.
Now that you have lived with the 2905s maybe you can enlighten me on your progress. Any tips, pointers would be appreciated. Have yours changed significantly now that they have broken in further?