Anything is an upgrade from Sovtek. I am surprised that Svetlanas burned out so soon. My current set get used about 10 hours a week and is 3 years old. They still test over 85%. The Svetlanas were designed to copy Mullard. If you liked the sound but want a little better quality, spend the dough on NOS Mullards!
Did all of the Svetlanas fail or just one? Get them tested?
Did all of the Svetlanas fail or just one? Get them tested?