Pat Sajak Tapes Tribute to 'Wheel' Announcer

11/4/2010 6:00 AM PDT
Pat Sajak and Vanna White put in some extra time on the set of "Wheel of Fortune" this week-- shooting a tribute for the show's legendary announcer Charlie O'Donnell, who passed away Monday.

We're told Pat and Vanna each said some kind words about the 78-year-old TV veteran -- and gave an intro to a montage honoring their friend as well ... and it's all set to air during Friday's episode.

FYI -- O'Donnell worked on "Wheel" for 28 years.