We find many references in the Talmud to what could be perceived as a Sanhedrin, like Chachamim or Beis-Din, or that Hillel and his descendants were the Nessi'im (of a Sanhedrin presumably), but I don't recall a reference to an specific institution of Sanhedrin, with a team of 71/23 (full-time) judges either before the destruction of the Temple, in the times of the Zugos, or after, when "the Sanhedrin exiled".
I do, however, recall that the Gemmorah does mention numerous places where the Sages meet and did their rulings, like personal homes and esp. penthouses (עליית הגג) or synagogues.
Does the Talmud mention a functioning Sanhedrin, like "this decision was directed in X Sanhedrin voting Y for and Z against"?
*NB: The question is very specific, please don't bother discussing if a Beis Din or a penthouse resembles the Sanhedrin or not.*