Hi diddly dee, the capture life's for me!
Relevant links be here;

Here's a link to that T-shirt
https://www.redbubble.com/people/fuzzclone/works/36782468-cromaclear-slot-mask-crt-pattern?p=classic-tee&ref=explore-recently-viewed

And the Trinitron/Sony Color logo one:
https://www.redbubble.com/people/fuzzclone/works/36782775-trinitron?p=classic-tee&ref=explore-recently-viewed

This is the video I'm following up on;
https://www.youtube.com/watch?v=ZC5Zr3NC2PY

And this is the video I referenced talking about composite video;
https://www.youtube.com/watch?v=InrDRGTPqnE