I thought it was a good idea to move this topic from the conversion thread. Hum reduction and safety but how does it work? It passes hum to ground? If a two prong amp is plugged in with hot and neutral reversed, the chassis is isolated from the hot wire by the death cap. Some call it the life cap. I'd call it the ground cap. A typical value is .047 mF. The chassis is isolated from the hot wire by the cap. How much voltage and how much current gets thru? Does .047 mF pass or block 60 cycle power? IDK how does one find out? How much current gets thru? It gets limited by the cap. How is it found? Use ESR of the CAP at voltage? Is that hard to find? my examples pass the wall voltage entirely to the chassis when plugged in wrong. Is that right? The cap provides safety by limiting current, does it also limit voltage?