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Well I don't have a schematic in front of me (and sadly its packed away deep), but IIRC those are the wires to the control grids. You would still have a blue raster I think(?).
Old color sets like the 16 have to produce a good b/w picture before the color signal is added back in. The (b/w) video is fed to the cathodes (it's called the y signal). The guns all have to track.
The chroma signals are added to the mix at the control grids. These are r-y, g-y, and b-y. As an example, b-y literally means "blue minus y", or blue minus the black and white component of the picture. As you turn the chroma control up, more of these three signals are added to the (already adjusted perfectly) black and white picture.
As for the resistors, if they're wirewound ceramics they aren't that hard to get. Otherwise, they might be metal film (I cant remember. pics would help). Those arent hard to get either. Anyway, look on mouser for "ohmite brown devils" if they're wirewound, and just "metal film" I suppose if they're those blue things marked with regular color bands. More wattage never hurts as long as the size is reasonable.
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