I've had a Peavey valveking for about a year and I almost always play metal rhythm and shred guitar. It has enough gain but it's not as tight or punchy as I'd like. I LOVE the sound of engl amps and I was checkin out a screamer and the thunder and they have the qualities I like in an amp but I was wondering if I could breathe new life into my peavey by retubing it. What do you guys think?