I did a rehearsal today and a fuse blew in my 400+. I haven't used it in a while. When it blew, there was a burnt smell. The tubes have less than 5 hours on them, and I don't know if this is going to be a chronic problem, because it has never happened before. I was running it from one of the 4ohm output jacks into a 8x10 SVT. After an hour, I replaced the fuse, it powered back up, and sounded fine. However, I'm afraid to take it to a gig now. Anyone have experience on this one?