2" Helical

AKA
2 inch helical VTR, VR-1500, VR-660
Era
1961–1970s
Format
analog
Format2
open reel
Developed by
Ampex
Manufacturers
Ampex
Market
Educational, Industrial
(Max) Capacity
5 hours
Size
6.5", 8", 10.5", 12.5" reels
Color
Color
Encoding
Composite
Scan Process
Helical scan
Tape type
Oxide
Tape width
2"
Bandwidth
Low Band
Fun facts
This format was not suitable for broadcast use and the machine was too large and pricy for consumers, so this format was marketed to industrial and educational sectors
The VR-660 (the professional version of the 2" helical scan deck) weighed 100 pounds, which was considered light in comparison with other video recorders from the same era
The 2" tape runs at 3.7 inches per second
Changing the angle that the 4 heads "the quad" recorded and read information on the tape from a 90° angle to a much longer angle (think diagonal, like the hypoteneuse of a triangle) allowed for more information to be written on the tape in the same amount of space (needing less tape for the same length of content)."(Michael Henry Grant)
Changing the angle that the 4 heads "the quad" recorded and read information on the tape from a 90° angle to a much longer angle (think diagonal, like the hypoteneuse of a triangle) allowed for more information to be written on the tape in the same amount of space (needing less tape for the same length of content)."(Michael Henry Grant)