Here is a performance of Tchaikovsky's opera from Boston in 1976 with Benjamin Luxon (Onegin), Nicolai Gedda (Lensky), Galina Vishnevskaya (Tatyana), Joy Davidson (Olga), and Paul Plishka (Gremin). Seiji Ozawa is the conductor. The entire cast is identified in the opening credits.
Here is a link to my main Benjamin Luxon playlist:
• Benjamin Luxon (1937-2024)