Before I start watch this Tektronix 4014 demo to set the tone.
https://www.youtube.com/watch?v=IztxeoHhoyM
The README for xterm says "Abandon All Hope, Ye Who Enter Here" and proceeds to say it has Tektronix support, but will be removing it soon. A few decades later...
Start xterm in tek mode with
$ xterm -t
Grab some *.tek files from here which includes one of the ones shown in the video.
http://atariage.com/forums/index.php?app=core&module=attach§ion=attach&attach_id=144074
Now cat one of those bad boys and experience the 70s all over again. Want to make your own? Here is the Tektronix 4014 manual http://www.vt100.net/tektronix/4014-um/4014-um.pdf
Obligatory wiki link https://en.wikipedia.org/wiki/Tektronix_4010
Memories http://www.modularsynthesis.com/tek/