Adjustable output level preamp equipped with vacuum tubes. The vacuum tubes have been replaced with new ones from Electro-Harmonix. A GE vacuum tube is also included as a bonus. Operation has been confirmed, and there were no signs of bulging or bursting in the capacitors. An adapter is not included, but please purchase a 9V AC adapter from Soundhouse. They sell them for around 1800 yen. The position of the holes in the casing is poor, and one screw cannot be fully tightened.