Quote:
Originally Posted by zeno
...carbon resistors rarely go down in value much.
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Occasionally there is an exception to this, with 2 watt carbons in applications where they run exceptionally hot. The phenolic casing carbonizes, partially shorting out the resistive element inside.
An example is seen in certain Sylvania hybrid color chassis where both demodulator transistors have a 2 watt collector load resistor which chars progressively, eventially killing the transistor.