※Please read the profile section before purchasing. This is a transformer-type universal AC adapter. Operation has been confirmed. The DC plug has been polished and is shiny. Because it's a low-noise transformer type, it's ideal for audio equipment with a wide input voltage range. Also, it's around 12V even without a load, so it can be used with audio equipment that doesn't support very high voltages. Please be aware that using it with equipment that has a fixed general input voltage may cause the equipment to malfunction. There aren't many AC adapters with this large a rated power that are transformer-type, so it can be used with audio equipment that consumes a lot of power. Specifications are as follows: Manufacturer: HUAMEI E.TWN (?) Model Number: 20L2170 Rated Voltage: 9V (12.3V without load, 8.8V with 1A load) Rated Current (Maximum): 1A Rated Power (Maximum): 9W Polarity: Center positive Outer Diameter/Inner Diameter: Outer diameter 5.5mm / Inner diameter 2.1mm Remarks: Transformer type, with old electrical appliance control law mark You can use various plugs by using a plug adapter with an outer diameter of 5.5mm and an inner diameter of 2.1mm. https://www.amazon.co.jp/dp/B0722J415P/