Brought from the HDP-R10 thread :-
Your pix were the first I saw in the internet. We were discusing them on a russian forum player.ru a year ago.
The information about 627 after DAC comes from one russian engineer from city Novosibirsk. He made a HI FI player Alexmod before the appearance of HM801. He used several bodies of other players (such as Cowon x5 or Iriver 120 an 140) and his own audiotract board. Also he made a dx100 and R10 modification. Perdonally I don't know for sure, if it is opa627 used after the DAC dx100, but player.ru users are sure about the 627+buf634 usage in the phone amp section.
It was very interesting for me to know, what OP is used in R10, because in the audio section dx100 and R10 are clones.
You guys were discussing about my pix :P!? Anyways...
What I'm curious about is how reliable and accurate is the info about the OpAmps used in the DX100. Maybe this is better in the DX100 thread. AFAIK, no one has been able to confirm the OpAmps used in the DX100 to be 627s. Let's carry on this on the DX100 thread anyway as it's quite interesting.
Your other HDP-R10 question could remain on this thread.
So I'm kinda curious on the folks on the Russian thread managed to determine the OpAmp used in the DX100 is the OPA627?