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
Convert?fit=crop&h=128&policy=eyjlehbpcnkioje0ota4njawotasimnhbgwiolsicmvhzcisimnvbnzlcnqixx0%3d&rotate=exif&signature=fb461c4fb3396bf01452afe32f20172d4d9ed67aba086e1673b42f78d9a86908&w=128bkdou812