Davnes007 said:

I might be showing my ignorance, but if you use the composite connections (Video, Audio L & R), you wouldn't be using the comb filter.

The comb filter is only used for the S-Video connection.........right?

:?

Well, a comb filter can be applied to any signal. There are even software comb filters available in AviSynth; e.g., TComb.

However, it's my understanding that, in hardware, it's usually the opposite of what you mentioned. That is, comb filters are applied to composite video sources because the luma and chroma aren't separated (unlike S-Video), which results in dot crawl and rainbowing artifacts.