Disclaimer: This was not my rig, distro, feed line, or stage. I was mixing the second band of the event but it all went down on my shift so I got the headache.
We had gotten the stage set and were setting monitors when someone noticed that the Dj's laptop and mixer were power cycling. While he was checking his connections the singer noticed that the monitors were cutting in and out. I notified the tech in charge of the rig that we were having issues and he started checking stage power. About that time I noticed that the lead guitarists amp was GLOWING BRIGHTLY and SMOKING! Lots of panicked disconnecting ensued. I went and got my meter and started checking power and some outlets were at 120v with others at 202v! Not good. Start checking from the distro back and discovered that the feed line was about 100' of 8/3 (not a good sign). There was a 50a twist lock connector that connected it to the distro and on the distro side of the connector there were issues causing neutral to half the outlets to lift. Problem gets fixed, provisions are made for the guitar amps, and the show goes on. Now in the aftermath the company providing PA is agreeing to repair the amplifiers that were damaged. The owners of the amplifiers want them replaced because they say that even if the amps are repaired there is no way to tell if the lifespan of the amps has been shortened. Has anyone else dealt with this situation? Even though this wasn't my rig or my gig (gear wise anyway) I'd like to know how others have handled this type of situation.