Ok, here is a fun one! I've had an AT-6666 since March and have used it at home and in my mobile. It has worked flawlessly with stock mic, power mic, 5/8-wave Sirio in the mobile and my dipole at home at all power rates. Last Friday when driving home from work, when I keyed up it showed SWR at 17:1 (it was 1:1 in the mobile) and then it died. I was wondering what caused it? It wasn't hot out, the Mic was turned up half way. I'm having it replaced for free but don't want to make the same mistake again -- unless this is just how they work... the just randomly blow up at some point. Suggestions?