On the Tektronix yearbook; it was originally available from the Tek museum for a small donation. Several retired Tek employees I've emailed have the yearbook, but none of them were willing to send me a copy. In fact, in the time it's taken me to talk to these guys, I could have gone through all the photos by now. There are about 18,000 employees in the yearbook. Most are not wearing ties, and the gender ratio is close to 50/50 from the sample pages I saw.
None of the Tektronix retirees believe DB Cooper could have worked there. The Cooper hijacking was a huge story and everyone "saw the sketch."
I got some interesting information about the phosphor particles, which I relayed to Tom.