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Need schematic for Sansui TU-555 vintage SS tuner

Hello Everyone,
I found the schematic for a Sansui TU-666 tuner on this site, I suppose that it is one model up from mine.
If anyone knows if the circuitry is similar between them and/or what the differences are, this would be appreciated.
Otherwise, here's to hoping that someone can dig up a TU-555 schematic for me.