I assume you're not a diy-er or you;d have diagnosed the problem yself. So,
If you're happy with the DAC, take it to a technician to check. It could be a very simple matter and cheap to correct.
A new dac would have a more performant chip (yrs is bitstream) in it -- but less fancy componentry. You could buy a contemporary dac (say, a Benchmark or similar) and have it upgraded with your components (many of which are re-usable). Keep in mind that dacs cost 500-1000 and you'll have to add the cost of modding... However, current AD or Texas Instruments chips used in dacs are very good performers -- so chances are the contemporary modded dac will outperform yours.
And jazz deserves good treatment, doesn't it ;)
If you're happy with the DAC, take it to a technician to check. It could be a very simple matter and cheap to correct.
A new dac would have a more performant chip (yrs is bitstream) in it -- but less fancy componentry. You could buy a contemporary dac (say, a Benchmark or similar) and have it upgraded with your components (many of which are re-usable). Keep in mind that dacs cost 500-1000 and you'll have to add the cost of modding... However, current AD or Texas Instruments chips used in dacs are very good performers -- so chances are the contemporary modded dac will outperform yours.
And jazz deserves good treatment, doesn't it ;)