The circuit board was damaged, so it has been replaced with a board that was traced and created. Also, all the potentiometers have been replaced with new ones. The parts themselves are all original except for about three SMD resistors that were damaged along with the board, and the potentiometers. There are no particular problems with the operation. The unit only. The appearance shows signs of use. Please check the photos. This is a used item stored by an amateur and has been repaired, so there may be oversights. Please refrain from purchasing if you are sensitive to such things.