Brand: Mark Levinson
I'm sorry but without further context, it's difficult for me to determine what exactly you're referring to with "Mark Levinson no 31." Are you referring to a specific audio component from the Mark Levinson line, such as a CD player, amplifier, or DAC? If so, please provide more details so I can assist you further. However, if you're just randomly saying "Mark Levinson no 31," please clarify your statement.