Hi there. I set up for practice last night (AI Clarus into Epifani UL110) and discovered that there was NO SIGNAL. Bah! FAIL! There seemed to be a tiny amount of signal getting through, but certainly not workable. I tested the head separately later and the DI output seems to be working OK - it returns a clean signal and applies the EQ as normal so I'm guessing it must have something to do with the poweramp section. I tested the amp outputs with both Speakon to Speakon and Speakon to jack into the UL and I tried both Speakon outputs - no signal. The speaker seems to be OK tested separately so I don't think that's the issue. Any clues? EDIT: Since we now suspect simply a blown fuse rather than anything more sinister I'm changing the title of the thread. I don't want to give the impression that Acoustic Image amps are suspect or liable to fail in any way. I've had the amp 3 years with excellent results and this is the first problem I've had.