RoHS

RoHS stands for the "restriction of hazardous substances" ordinance. Since its adoption by the European Union, it has set the worldwide standard for manufacturing practices. In electronic equipment, batteries not included, this limits what substances may be put in at the time of manufacturing. Toxic substances such as PCBs (polychorinated biphenyls) previously used in capacitors, certain fire retardants, and lead solder are no longer going into your electronics products. For the most part, these restrictions are a good thing. The down side is that lead free tin solder is brittle and will break under strain, especially with wave soldered (machine soldered) products...

This means that your amp won't make it to the gig and back as many times before something goes wrong. I understand the idea of keeping lead out of the water table, but you end up with more electronics products in landfills because their being designed to fail and are being manufactured for cheaper than you can pay someone to fix them. Anyway, the more malleable lead solder is the way to go to keep from throwing the stuff away over bad solder joints. For this one reason, I am a bit RoHS defiant.