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That circuit breaker is usually in the cathode circuit of the horizontal output tube. It will trip when it draws to much current to protect the tube and flyback. A loss of drive to the output tube, and a bad output tube can cause it to trip. A shorted primary is also possible. The 1 ohm sounds like winding on the bottom going to the HV rectifier tube. It is just 1 turn of wire and could easily be .1 ohm like shorting the leads. I would have to look at the schematic.
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