For sale is the 'holy grail' of amp op-amps from Burson Audio.

https://www.bursonaudio.com/product/supreme-sound-opamp-v5i/

I bought a pair of these a while back and swapped out the stock op-amp in my xDuoo XD-05. It is an instant upgrade for the sound quality and my little xDuoo is now dominating my listening time. I have one extra to send to people in need.

Price includes shipping, so you get the product at a much lower price than the official website without having to deal with international shipping.

Please PM if interested. Thanks for reading.