I suggest you don't do anything with it; a twenty year old DAC will be trounced by any number of new models. I suggest you put it out to pasture in a less refined rig. I would not dream of using a twenty year old DAC, not with the fabulous advancements and low prices of new ones. Go whichever direction you wish, NOS or massive oversampling, you can get some terrific results. I'll let others boast of their performance.
Replacing caps in DAC
I’ll be replacing caps in my 20 yr old Entec Number Cruncher 3.0 – last upgraded by Bob Crump. It still sounds pretty good. The 10 Nichicon Muse caps (radial) will be replaced by the same. The 6 low value Hi-Rel and AudioCaps (axial) are not made anymore. Any suggestions for substitutions? Thx