That is the primary difference between computer and television monitors. The television monitor has a video decoder that can take the single composite color signal, turn it into the three separate color signals and feed those to the color tube. They have no effect on the image that is recorded. Hue actually rotates the phase of the color wheel. Saturation dials color into and out of the black and white picture that is the foundation of a color picture.
Contrast varies the video level.
This causes only blue to show on the tube. The effect on color bars is to create alternating bright and dark vertical columns. All the dark columns should be equally dark and all the bright columns should be equally bright. Sony has, in the past few years, gone to a system that turns the tube monochrome when the blue gun only switch is depressed. Adjustments are made the same way to hue and chroma controls, but the image looks gray and black, rather than blue.