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Blue only
Once you get to the blue only stage, you should be looking for equal blue luminance visually on the cyan and magenta bars. The tint control will set this. This should be your ideal tint point...for bars.
Modern monitors have a blue only switch for quick setups. Modern NTSC bars are also split field with a smaller sub-set of bars through the middle. With these bars, the larger cyan and magenta bars are tint set as before, but now the sub-set bars (also cyan and magenta, but about 135 degrees out-of-phase) should also be luminance equal (but backwards) to the point that their luminance visually matches the bar above it. Rotate the tint until the upper chip matches the lower chip and all four should match.
This is the quick way to set analog sub-carrier phase from multiple sources through a switcher.
Never having setup a CTC-anything this way, it seem like setting the tint to center and adjusting the innards with this as a reference point would be something to look at.
Hope I did not add more hours to your scope time Pete.
Dave A
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