App note: Grid resistors: Determining nominal resistance

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App note from Vishay on selecting grid resistors base on their application as resistors vary over continuous duty. Link here (PDF)

Nearly all resistor materials change resistance as temperature increases. Depending on the material, this change can range from a few percent to 50 % and higher at 100 % duty on the resistor (100 % duty raises the resistor temperature to ~ 375 °C over ambient).

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