First, thanks to dvakman for the above links. I had read the Ampex article before; that story was going around a couple of years ago. It's all very interesting.
A couple of things I noticed on a couple of "Sesame Street Unpaved" episodes which aired on Noggin which may or may not pertain to this:
#406
Early in the show, the "Dee Dee Dee" song clip with Ernie and Cookie Monster is played (aside from Sam The Machine, #406 is worth having just for this song segment alone; it's one of Cookie Monster's finest moments). Ernie is singing about the letter "D" and when Ernie mentions an object which starts with the letter "D," Cookie Monster races to produce the object, or a sign with its name on it, or draw it on a sketch pad. Aside from teaching about the letter "D," it's funny just for the sake of being funny. But anyway...if you have that episode on tape, look closely at Cookie Monster during this segment. His chest area is quite dark and I swear (or affirm) that I am seeing digital artifacts flashing on his chest during this song...like a low-bit-rate MPEG or slow-speed DVD-R. And that was how it looked on air (when Noggin aired it). Apart from that though, #406 seemed to stand out among "Unpaved" episodes for generally having crisp and clean image and sound throughout, and that can be variable from one show to the next. It's an excellent-*sounding* episode.
#1839
Yes, this has to do with the famous "Death Of Mr. Hooper" scene. At the very tail end of the scene, when the whole cast forms a circle around Big Bird, is it my imagination or as the camera slowly pulls back and the scene slowly fades, does the "slowness" make it more noticable that these shows seem to have been duped on some "economic" (low bit rate) digital format? And I do need to acknowledge that I know very little about digital archiving...but there just seems to be something funny about these two segments in particular which I couldn't help noticing.
Anyway, I'm just rambling, for what it's worth...