For sale is a 1992 Mesa Boogie Dual Rectifier Rev D #R0417. This amp is in very good condition and is all original with the exception of the tubes. The serial number on this head is R0417 making it one of the pre 500 amps. Notice that the amp has the small Mesa Boogie logo. This amp was originally sold in Japan so it needs to be used with a voltage converter. They're about $50 on Amazon. These amps are a great investment as they are getting harder and harder to find and definitely help shaped the sounds of the 90's.