That was my first thought....the head cylinder on those old things spun at 1800 RPM. Though they may have only spun at 1500 RPM in the UK since (if I remember correctly) PAL had a 50hz vertical rate.
11 posted on 04/05/2013 4:28:38 PM PDT by Nik Naym
(It's not my fault... I have compulsive smartass disorder.)