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I would check the horizontal output transistor for shorts before replacing the fuse because there's a good chance it's shorted. There are several things that can cause a HOT to short; such as a bad flyback transformer, loose solder connections, and bad electrolytic capacitors in the B+ and horizontal driver circuits. Instead of a fuse, you might wish to use a 100 watt standard incandescent bulb in place of the fuse. If there is a short, the bulb will serve as a load that will help protect other components.
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