I would move as others have stated to a new DAC. If your system is on the bright side two DACS in your price range come to mind. For a great tube DAC in your price range a used Havana is very warm and musical sounding and can be fine tuned with different tubes. For SS I would look at a Metrum Octave which is not as warm as the Havana but will give you more detail and is still on the warm side of the dacs I have tried . Metrum was selling these out factory direct for about what you want to spend but they may be gone by now and might be hard to find on the used market. The HavanaÂs come up from time to time and IMO are a great value. Good luck and keep us posted on what you end up with and how you like it.
Greg
Greg