I have been considering the same thing with my Music Hall CD25.2 for some time. It has socketed op amps, which should make this easy (Burson sells the HD op amp on 8-pin DIP socket). Very tempted, hoping someone chimes in who has done this already. Think it would cost less than $200 for the parts, can't get much DAC for that money.
I have upgraded to Burson op-amps in as ASR Emitter II amplifier and a high-end CD player. This is a very worthwhile upgrade, better than monolithic op-amps in every aspect of the audio checklist. Give them a couple of hundred hours to break-in and have fun! I have about 15 years experience in tweaking electronics. This is a winner, probably one of the best electronic tweaks. Warning: pay attention and make a note of the location of pin 1 in order to avoid mishaps. You may need to solder a short ground wire between the op-amp and the component's circuit board. I had to add a ground wire on the ASR Emmiter, though I do not recall the reason anymore. Enjoy!
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