Cheers, I'm glad you liked it.
The amp is a Peavey 6534+ with the standard Ruby EL34BHT tubes (actually this is a replacement set, but it came with a set of those) and a mixture of Tung Sol, Ruby, and Sovtek tubes in the preamp (Ruby AC5 HG on the lead channel, Sovtek LPS for the PI, and the rest Tung Sol). The screen resistors have also been changed and all of the solder in the amp was replaced, and the amp biased a little hotter than stock. Really though besides the basic amp design most of it is the pickups, the EQ settings, and a couple of nice pedals like the Ghost Echo. Personally I think the picks have an impact on the tone, as does the way a person plays. You could use the same gear and settings and sound different. The picks I use are just 1.14 Dunlop Max Grips, nothing special but a fairly stiff pick. I don't think changing the tubes made a massive difference, although I did have a Tung Sol in V2 for a short while and I did notice that was too strident for me, and I swapped it with a Ruby and moved the Tung Sol to V3 (effects loop).