Sources close to Linda tell TMZ she'd like to get a look at the tape because she feels it could be a key piece of evidence in Hulk's defamation lawsuit against Linda. Hulk sued Linda last year ... claiming she was lying when, in her book, she alleged Hulk was abusive and cheated on her.
We're told Linda would like to figure out when the tape was made because it could help her prove Hulk was a cheater. According to our sources, if Linda can figure out who has the tape, she'll attempt to subpoena them for her case.
Hulk told TMZ this week he has been faithful to his current wife Jennifer, so the tape is at least five years old.