Help re: 'You're a Good Man , Charlie Brown' episode

Somewhere in the early '70's, Flip Wilson did an episode of his variety show whose highlight was Flip's own production/skit off "You're a Good Man, Charlie Brown." Alln I remember as to who played which characters was Flip ("Charlie Brown"), Lucille Ball ("Lucy") and Donnie Osmand ("Linus"). Other guest celebs whom I can't remember took on the roles of the rest of the Peanuts gang.

My question is, does anyone know (or can they find out) when this episode originally aired?

Sadly, there aren't many threads or posts in the Flip Wilson forum, so I won't be expecting a response any time in the near future. So if you have an answer and post it heare, please send me a private message and let me know to come back to this thread. Thanks in advance!