I have used the USB 6259 DAC previously but it is not appearing as a current item. Are they still being sold, or is there an equivalent replacement part?
NI used to include a recommended replacement part number, not sure why they would stop doing that. But the USB-6353 https://www.ni.com/en-us/shop/model/usb-6353.html looks like a close match. You can always call to double check.
