Ortofon MCA-10 upgrade

Hi, I just started an upgrade to my old pre-preamplifier Ortofon MCA-10. I would like to share that experience if there are interested guys.
Unfortunately, there is no schematic on the net. There is anybody in possession of this?
Or there is someone that has done this upgrade?
Many years ago I use it with my EMT XSD 15 and sounded great.
 

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