Curiosity overcame me this morning. The few carbon resistor failures that I've seen looked burned. Why would this normal-looking resistor fail? I assume this porosity wasn't part of the design, but was it a manufacturing defect or did it occur during use?
In that vein, here's a photo of something I found a few months ago when I started this project. When checking continuity, I couldn't get consistent readings on this coil. I think somebody at the factory forgot to solder this one.
