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I recently acquired a number of bits and pieces from an old Technics amplifier.

Included was a potted power transformer with mulicoloured leads. Stamped on the transformer are, SLT5M89 and ETP66H7E.

I have tried an ohmmeter across leads, no obvious indication which is primary.
The leads are coloured: GREY, BROWN, ORANGE, YELLOW, RED, BLACK, BLUE x2, WHITE x2 and
and a further lighter GREY.

Any help would of course be greatly appreciated.
Thanks for your time.