Unknown? It's well known model based on wery well Burr-Brown chips PCM1702. I modded it. I built a new tube analogue stage. There are some pictures:
http://audiosurgery.beepworld.pl/odtwarzaczecd.htm
http://audiosurgery.beepworld.pl/odtwarzaczecd.htm
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Jan Dupont said:(...)
Not yet found any reason to mod it
Nice work, McGyver
Thanks!
Try passive I/V conversion followed by SRPP (Audio-Note like) and You never return to opamps.
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