Sorry to bring a two year old thread to the top, but it's a very interesting set.
Tom if it's still fresh in your Electronic memory
, I'd be curious to know how they ran the composite video input into SC video module on that beast. I recently picked up a second SC model 2500 off Craigslist that the cabinet has seen it's better days and I'm contemplating hacking it into a color monitor. Basically all in the name of education and experimentation.
Edit added note - I realize it needs to go the grid of the 1st video amp. What I'm wondering if they added any circuitry or if the composite video connector goes directly to pin 4 on the video module/mother chassis. Pin 4 appears to be the 4th pin inward on the video sub chassis connector when viewing from the back side.