Any info on Win Laboritories SPG- 10 preamp w

I recently picked up a Win Laboritories SPG - 10 preamp, And am hopeing to find some info on iy and Dr. Sao who designed and produced this ,appears to have has MM & MC phono, only its marked STD in. On what I have been able to find , he had a special cartridge he used... Any assistance would be great ! Thank you.

Best regards
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