Thx man very informative thing is I'm an old rocker, for me nobody and nothing is going to convince me that the ampeg svt 2 pro is not the ultimate in bass sound I love it ! Thing is never sure if a valve going flipped until it does not gigging as much and as I said not as young as I was lol found the tech 21 sansamp vt deluxe think for me it's going to be a winner