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Original Message
Copper resistance increases with temperature.
Posted by sser2 on March 18, 2017 at 17:13:27:
Copper has one of the highest positive thermal resistance coefficient (TRC) of all metals. For this reason, cold choke has lower DCR than when it is heated by current passing through and warmer environment of working amplifier. Metal in resistors has much lower TRC than copper, so value doesn't change much with temperature. Carbon resistors have negative TRC (their resistance drops with increasing temperature.