I have an ampeg svt-3pro currently. Found the 4 pro on craigslist for $650! So I could sell the 3 pro for pretty close to that. I play in a punk band so I could probably use some more head room, however the 3 pro has 3 preamp tubes and 2 driver tubes and the 4pro only has 3 preamp tubes. Will I lose some of the grit that I enjoy with my 3 pro and thus sacrificing grit for more headroom??? Any advice would be greatly appreciated.