I have an ampeg v4 distortion knob amp. It was beaten up and spray painted by others. I was looking into get a tune up, changing to a grounded plug, maybe putting in a fan and definitely putting in a fx loop. Now I'm reading it isn't the same thing as the early non master volume and or non distortion model. That those are way cooler and have a totally different schematic. So before I go modding this one, that I haven't had a chance to play with a lot yet, should I sell it for an earlier model? How different are they? Is it apples and oranges or apples and apples of a slightly different varietal?