16-Nov-2020: In late October a massive 82-hour fire destroyed AKM Semiconductor's ability to deliver parts, including the AK4490 DAC and AK5397 ADC used in the QA401. A replacement product (called the QA402) has been announced. 18-Jan-2021: A short run of the QA401 has been built, and we may do one more. But for now, QA401 can be purchas