Wonderful, I’m glad it doesn’t look like I’m completely off base here. I’ll try to solder something up soon to see if it works and share that here.
I noticed that they noted the voltage level on the RGB to YPbPr schematic and from Lars’ response on this thread about the Cadet II clipper circuit, it seems to pretty much match up with the expected voltage level.
My initial idea was to tack this circuit onto my Cadet II and install the YPbPr jacks in an adjacent 4HP blank or on a 1U row right below it. If this turns out to be right (or if it’s too noisy on protoboard), I’d be up for working with someone who knows PCB layout better than me to produce a 8HP layout with YPbPr built into it.