Some small parts like IC's, PCB's and small motors for cassette recorder, which I order from Germany in China, was often send via "Registered mail" in a small package - go toBecause I am in China. Unable to sell them on EBAY. So it can only be used as a display. The mailing fee is quite expensive.
https://en.wikipedia.org/wiki/Registered_mail#:~:text=Registered mail is a postal,a delivery attempt was made.
I always thought that this only worked for postcards and letters without any goods in them, but this isn't true.
Maybe this is a possibility for you to send your PCB's in other countries.
P.S.: check out this threads:
https://www.diyaudio.com/community/threads/ultraanalog-d20400-data-i-have-it-all.254748/
https://www.diyaudio.com/community/...r-ultra-analog-dac-d20400.377627/#post6801120
https://www.diyaudio.com/community/threads/ultraanalog-d20400a.81542/
http://bbs.hifidiy.net/thread-1499850-1-1.html
P.S.-II:
maybe the member of post #29 under
https://www.diyaudio.com/community/threads/ultraanalog-d20400-data-i-have-it-all.254748/page-2
can say, from where one can get the datasheet of OKI's M72H035 (custom made for Ultra Analog).
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