I am selling a set of two Burr-Brown OPA2604AP audio op-amps. I purchased these new about 15 years ago and have kept them in storage. As you can see in the photos, the pins have discolored to a brownish hue due to aging, but they work without issue when inserted into the IC sockets of my amplifier. I have a total of 33. If you let me know the quantity you want in the comments, I will relist them with the number and price (@1000 yen x quantity). I will ship from Kanagawa Prefecture via Yu-Packet Post Mini. Thank you.