I was thinking about that when I started reading this thread
I could not remember what show it was, I was thinking flip wilson
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There was another appearance on PBS on a show called "Soul".
Gladys and the Pips did at least a 1/2 hour show backed by King Curtis and a band that included Chuck Rainey, Cornell Dupree, and Bernard Purdie. It was around 1970. This was a short lived series on PBS - maybe 3 or 4 shows. It was broadcast on Sunday nights on Channel 13 in NYC at 10:00 or maybe 11:00 pm. If any video survives it would make one hell of a DVD release series. I remember another show featured Junior Walker.