Svetlana vs. GE tubes for conrad-johnson

About 2 years ago c-j changed the source of the 6550 power tubes in Premier amps from the GE n.o.s. to Svetlana 6550-C. If you have owned a Premier 11 or 12 and have compared, what's your impression of the different sound these two tube sources produce? Any other good choices of tubes for these units?
I did try both of them on the Premier 11a. Personally I like Svetlana tubes than the GE tubes.
I had the 12's and went from GE 6550's to EI KT90's and liked them much better..also, check out the svetlena kt88.