Stan Griffiths
Stan Griffiths was employed at Tektronix from 1960-1966 and 1970-1989.
He owns a large collection of Tektronix equipment and runs a Tek related website: http://www.reprise.com/ash/clients2/default.asp
He wrote a book, Oscilloscopes: Selecting and Restoring a Classic, covering 300- and 500-series oscilloscopes and plug-ins, and early 400-series (410, 422, 453/454 and 491 spectrum analyzer).