With the help of a few ex-Tek and ex-Sony/Tektronix employees who have graciously provided information, photos, and scans, we now have a fairly complete page on Sony/Tek history. It is located under "Information and Resources">"Locations and Subsidiaries">"Rest Of World">"Sony/Tektronix".
Under "Information and Resources">"Articles" there is a page for "Memories Of Gotemba" which includes a scanned booklet commemorating the 30th anniversary of the manufacturing site.
Also under "Information and Resources">"Articles" there is a page for "30th Anniversary of Sony/Tek" which includes a scanned booklet which is very large so is divided into 6 sections for viewing.
If you have any additional photos, documents, videos, or information on Sony/Tek please contact the museum. Our email is on our home page.