Umatic variants

[old_tv_nut]

Let's clarify the color under process. All tape mechanisms produce timing jitter that is too great for a receiver or monitor to follow the chroma frquency and phase changes. Full bandwidth systems like quad 2 inch correct the whole baseband signal including luma and chroma.
Color under systems separate the hgh frequency part of the composite signal including chroma and luma but the only correction is the phase of the chroma and burst. The jitter of the luma between 0 and 3 MHz is acceptable uncorrected. But no chroma can be allowed to go through the luma channel because it would give a total mess of corrected and uncorrected chroma.

When the signal is known to be monochrome, the color circuits can be turned off and wider bandwidth luma can be passed through the FM luminance channel. Still jittery compared to a machine with TBC, but acceptable.