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Triac was usually jumped when cable came. The cable boxes had a switched outlet and made the on/off on the TV redundant.
Check the circuit breaker and ferroresonant capacitor. The cap opens and trips/kills the circuit breaker.
Also, check/replace any white safety capacitors. They would pop and slowly raise the high voltage until it could pop the neck on the CRT.
Check the capacitor/resistor connected to the horiz out transistor. 1.5 or 15 ohm (sorry, can't remember the actual values) and a small electrolytic paralled together. The resistor goes up in value killing the horizontal output and tripping the breaker.
Other than these, a very reliable set with a great picture.
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