After reading so many positive reviews I bought 2. One for my Peavey 5150 with SED Winged C 6L6GC's & one for my JSX with SED Winged C EL34's. Both in V1 & made all the difference in the world. Such a well balanced tube & three-dimensional. I've only been able to set my guitars down long enough to order more since they've been installed. I never thought a preamp tube could make such a difference. 5 stars all the way around!!!!!!