Thanks so much for the info. What is the (R) badge? Also what does the polarity switch do?
The polarity switch switches the polarity of the AC in the power supply, only relevent with the old two prong plugs.
Sometimes switching polarity is a cure for hum and/or getting shocked by your amp when you touch something.
Usually "something" like a microphone with your lip.
Use the search feature and do a little research, you will get answers for
most of your questions, if you can't find something specific post a question. People here are
very helpful but the same questions over, and over, and over can get a little annoying.
EDIT: Sorry loudthud, I was typing when you posted!