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That link didn't seem to work for me - so here's a look into the doghouse of a CTC-5. The flyback is in the upper left. The yellowish tubular part is the primary winding, and the secondary (high voltage) winding is the donut-shaped part wound over the primary.
It's called a "flyback" because it works with the horizontal deflection yoke to make the beam scan left to right across the screen and fly back to the left quickly. During the fly-back, the primary generates a half-sine-wave voltage pulse of perhaps 5000 volts in a tube color set (about 1000 volts in a transistor set), and the secondary winding multiplies this up to the 20,000 to 25,000 volts needed for the picture tube.
You can see a black wire from the primary going out of the doghouse, which goes to the horizontal output tube (not visible). The black wire from the donut goes to the high voltage rectifier tube, which then has a red wire going to the picture tube. The tube at the lower right is the high voltage regulator, which is not needed in later designs. The small tube mounted on a slant is the focus voltage rectifier.
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