@jond A good sounding DAC is a good sounding DAC full stop for me. I am currently using a 12 or so year old DAC, the Yamamoto YDA-1 and it sounds fantastic
Amen brother!
The Yamamoto is an under the radar Japanese audio gem. I agree with you and others here on the merits and longevity of really well designed, engineered and implemented DACs stand the test of time easily. Things do improve and change over time but I believe this is often greatly overstated.
Focused attention and quality put toward the DAC’s power supply, analog output stage and I/V conversion go a very long way in ensuring many years of satisfying sonic performance.
Charles