Becarfull with the Presence knoob! I never put more than 10h, cause it gets sizzle and thin...12hs is the LIMIT FRO ANYTHING (MarkIIC ou Mark IV Modes)!!!You shold try to EL34 ...i use it...and do not miss the 6l6!!! I play Metallica, megadeth, antrax, blacksabbath, slayer, pantera (my cover...