By 1952 BCE also had moved on to multi-track machine, but found limitations in recording bandwidth even at the high speeds. In 1953 BCE discovered that the magnetic head design was the problem. This problem was corrected and bandwidths exceeding the 1 megahertz limit were able to be recorded. Since BCE and AMPEX were working together on the video recorder the new head design was shared with them, and AMPEX used it in their recorder. In 1955 BCE demonstrated a broadcast-quality color recorder that operated at 100 inches per second and CBS ordered three of them. Many other fixed-head recording systems were tried but all required an impractically high tape speed. It became clear that practical video recording technology depended on finding some way of recording the wide-bandwidth video signal without the high tape speed required by linear-scan machines.