So, I noticed when I change the volume with my preamp knob that it will futz and make static noises. I think there might be a short somehow since it only happens with that knob. Second the other day I started to smell a funny smell from the amp and noticed the fan wasn't going on and it seemed moderately warm. Since then, I've used it for by myself practices and at low volumes and at moderately louder volumes (middle on first volume, middle on master, no boost) but the fan never seems to kick on. I can't seem to recall if the fan on these goes on often or not (or if only at loud volumes or prolonged periods of usage). How often does your fan come on? Loud volumes only? Long time usage?