Hi Don, Most of the old CBC show were shot on video and usually it got use again and again.
So in true CBC fashion most of those early shows were destroyed. Not sure about CHCH, but I would expect the same.
However Manny and Bill Langstroth(married Anne Murray) created a show 10 years ago and the basis of the show was old clips of these early folk/music shows.
I'll PM you Mannys address and perhaps he might point you in the right direction.
All the best,
Glen