[ARC Tech-109]

Good deal thank you for that. I'm still chasing my tail with the video input circuit but I did find the name of the Setchell Carlson TV-Monitor we used in school (before climate change) and they were called the "Color Educator". For some reason I thought they were B&W but as it turns out it was because they were used with a Panasonic NV-3020 monochrome EIAJ machine and that added to my confusion.
Problem I'm having seems to be with the impedance matching and higher frequency response as the chroma is very weak, strong color highlights show but anything below that is washed out luma only. Going to put together that 12AT7 circuit tonight and see how that works out, not sure I have a 20uH choke however.
I spent the morning looking at the World History pages but didn't get this far down the list so thanks again for the link, I didn't know we had microwave STL in the early color days. Judging by the cabinet it looks like a kilowatt or better of input power to get a few watts of microwave, wish we had those electric rates today!