so i know this has been beaten to death, and i've already searched, but haven't been able to find a solid answer. in all my posts, i pretty much tell my gear. svp pro, qsc rmx 850, peavey 810, mia jazz, and i play in rock bands. i need new tubes for my svp. i basically have it narrowed down to the sovtek 12ax7lps, or electro-harmonix 12ax7. which are going to sound more balanced, smooth, and less distorted. also, which would last longer. i've heard about problems with the lps dying early. what do you all think?