Yesterday, one of the power tubes in my amp went south, arching pretty badly, loud bangs etc. To play it safe I will replace both. The tubes were Mesa GLC 6L6 STR 430's, they were in the amp since about 11 months with no heavy use. I would like to replace them with something more rugged and that does last longer. For which brand/type/model should I be looking for? I don't want to use GT, Sovtek, Svetlana or JJ's if possible, as I didn't have good experiences with them recently.