So tonight I was using my VB2 at rehearsal, then all of a sudden, it started to get softer and softer....then, nothing. No sound, not even a buzz or hum. I checked all the cables, switched instruments, etc. and still nothing. The tubes are lit like a christmas tree, so I assume they're good. I pulled the fuse out, but it is sand filled or something, so no way to tell if it's bad...plus, the tubes were lit, so that would lead me to believe the fuse is OK. Anyone have any ideas with this? I'd like to try and troubleshoot before I take it to a tech and spend serious cash. Thanks.