This guy (Lab Guy as he calls himself) has been a long-term You Tuber on all sorts of topics relating to television. In recent times he's done quite a few related to NBTV, both electronic and mechanical. He can at times be a bit long-winded, but his videos are worth watching...
https://www.youtube.com/user/videolabguy/videos
A sample of his home-page showing a few NBTV items he's done...the link above (hopefully) takes you to that exact page...no doubt many of you are already aware of him...click image for larger version, your back button to return here...not the one as part of the attachment..
Steve A.