What happens? Does it go all at once or slowly? Does a slow death equate to a corresponding degradation of tone? When it's completely failed, will the amp cease to work? I ask because I just got a used amp and it sounds terrible. I've owned this model before and know what it should sound like. This one is muddy and farty with no definition. I took a look at the filter caps and low and behold, saw this; Other then the horrible tone, the amp seems to be working OK. So is this filter cap the likely culprit? Since the amp still works is the cap just part of the way to total failure? What happens then, sparks and explosions and stuff?