I think a picture of your burned analog board is in order if you can, Kallikak, this is making me quite curious. The only thing I can think of is what tomlee59 said, maybe the switch failed somehow or was left at the perfect spot between off and on where it proceeded to burn up. You can do this to burn up ordinary light switches if you're careful and persistent, and it does produce quite a burning stench. All depending on how many lights, etc. are hooked up to it. 60W won't do much, but 600W, well now we're talking.