Last 25 minutes from a show of unknown date of broadcast, but confidently narrowed down to the end of 1989 or start of 1990.
The Blue Pearl single was not released until 1990, and the lack of any references to "next year" during the outro perhaps favour a January 1990 show. NB John was playing the promo version of this as early as October 1989.
Tape cuts in
Filthkick - Celebration of Good for Nothingness ( Split LP w/ Extreme Noise Terror, 'In it For Life', High Speed Recording, 1989)