The Williams/Bally promo videos were exactly that... Videos!
What you see on YouTube are copies of the original VHS promo videos that have been played a thousand times before being copied.
These are available on DVD from Pin Game Journal:
http://www.pingamejournal.com/cool/They are better than what you see on YouTube, but only that they play full screen. The video quality itself is the same.
I have them here, and they are a GREAT watch! Williams really put some effort into these videos
