One of the online tube retailers has upgrade packages for lots of amps and I'm looking at the 2 options for my AC30CC. One has the Russian EL84M / 6P14P-EP and Sovtek 5AR4 / GZ34, and, the other JJ EL84 and JJ GZ34 / 5AR4. Both packages have Tung Sol 12AX7's. Does anyone have any experiences with these set ups? My initial thought was to go with the JJ's since Voxes are tough on tubes and JJ's seem to be able to take a beating, but the packages cost about the same so I'm wondering if I should consider the other option. Any thoughts/comments or other options/suggestions are appreciated.