Hello fello TGP'ers, looking for some power tube recomendations for a Peavey VTM60 with 518V plate voltage. I have been researching a lot of tubes, especially KT-66's. Should I be worried about max voltage handling? After much research I am leaning toward Valve Arts, Shuaguang, or JJ KT-66. I would be playing mostly metal and rock on this amp, and occasionally blues.