I added the 2 resistors to make 690ohm and a 16V 220uF cap I found in series as a test then tried it on my CRT TV again. The last time I tried the Jag on my CRT the colours were really messed up. It had a really yellow tint, very dark image and just really messed up colours in general, but then it looked OK with the OSSC. The TTL CSYNC explains it all now and it looks absolutely perfect on the CRT too. Really bright and perfect colours.
How do I go about testing CSYNC to 75ohm termination? Sorry if that’s a stupid question but I’m not entirely sure which points to test for it.