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Most degaussing coils are placed (in series with a thermistor low ohms when cold, high resistance when hot) across the powerline. When you switch the TV on, the coil sees a high AC current for about 1/2 second until the thermistor gets hot to cut the current to almost nothing. If there is a fair amount of insulation on the degaussing coil (probably there is) try salvaging a thermistor from a dead computer monitor (be sure it fed its degaussing coil and not its power supply (the power supply one goes the wrong way) and connect it in series with the degausing coil. I assume that the degausing coil has no connections to the chassis, and that you can easily access both ends leads of it to isolate it from the chassis electrically.
The TV won't be as designed modified this way, but it should work fine and be a good work around for the unobtanium Heath parts.
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