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Honestly I wouldn't even worry about it, either way its a 57 watt drop of energy and must be dissapated be it with a 50 watt or 100 watt resistor and that is going to cause a rise over the ambient. Unless it's causing a problem with the nearby selenium or other parts I wouldn't worry about the rise. A wirewound resistor can handle far more than its paper ratings without shifting its value.
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