• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

resistors of a lower power rating

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rpapps

Member
Joined 2004
They can overheat, change in resistance value or simply go open circuit.
Measure the voltage accross them and use the e^2/r formula to work out the power being dissipated.
It's good practise for reliability to use resistors rated at least twice the power they are actually dissipating.

Cheers
Rob
 
kmtang

kmtang

Member
Joined 2004
Simply measure the voltage across the resistor. Then calculate the power dissipation of it with P=V*V/R.

Most of the time people put a higher power rating. With this calculation, you should know exactly what it should be.

For reliable operation, you should allow at least 50% margin on the resistor wattage rating.

Johnny
 
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