Ok-i tried to use a descriptive title. My amp has been doing this for awhile but today it was really bad. I'll be playing and it will be running fine & then the output disappears. The preamp signal light still lights up so i'm thinking the problem is after that stage. I know this probably isn't the best thing for it but i've just hit it or shook it till it works again and that helps for a while, but today it went out what seemed like every 10mins. Could it just be a wire that has come undone or do you guys think it's a major problem? I'd like to get it fixed but since money isn't unlimited if it's something that i can do that'd be great. I am more than willing to provide any information. I tend to run the amp @ 1/2 volume and then EQ it to suit the bass [bass guitar or upright]. I run it with the horn level off. Thats all Thanks for the Help.