DELICATE OPERATION -- Richard Barrett (right, William Gaunt) looks on as Sharron Macready (Alexandra Bastedo) removes a transistorized receiver from the ear of Craig Stirling (Stuart Damon), in “The Invisible Man” colorcast of the NBC Television Network’s “The Champions” Monday, July 1 (8-9 p.m. NYT)   (6/7/68) (D)      NBC-TV CAPTION SUBJECTS:     (left to right): Alexandra Bastedo, Stuart Damon and William Gaunt PROGRAM:     “The Invisible Man” episode of “The Champions” TIME:     NBC Television Network colorcasts, Monday, July 1 (8-9 p.m. NYT)