[QuadList] Ampex AST heads and CMC DPT heads--what's different?

[Dennis Degan]

		On May 8, 2010, at 11:14 AM, C. Park Seward wrote:

 > I think the Ampex AST head performs the same way. I'll try to find  
some docs.

		I offer:

	I somehow remember that the AST head was mounted on TWO strips of  
bimorph material sandwiched together.  Flexing of the two would  
maintain the head's face flat against the tape.
	A single strip would flex in an arc, which would cause the face of  
the head to not be flat against the tape at extreme head position  
swings.

			Dennis Degan, Video Editor-Consultant-Knowledge Bank
	  				   NBC Today Show, New York