This answer to a question about the looks of hyperspace travel in Star Wars seems to indicate the "blue tunnel" effect, which happens once the ships are traveling through hyperspace, was already there in Return of the Jedi.
Now, I know memory is a tricky thing, but my childhood memories of the original trilogy are very vivid when thinking of the stretching stars when entering hyperspace, but I don't remember the "blue tunnel" effect at all.
Does anyone have any footage of the original Return of the Jedi, unmodified by later SFX remixes, to check whether the blue tunnel was always there or it was added in later edits of the movie?