In that particular unit, the video recorder actually used 2" tape, but instead of the signal being laid down in the traditional quad format, the video recorder used a proprietary helical scan system.
The recorder installed in the cabinet unit is probably a VR-660, advertised as the company's first portable VTR, which was later followed by the very similar looking VR-1500. The list price of the recorder alone was $14,500!!
To give you an indication of how "portable" they are, mine weighs 96 lbs... **without** the tape!
-Kevin