• 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.

Bias the new power tube

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The answer to that could fill a book. Or at least a chapter or two of a book. A few days spend studying the Radiotron Designer's Handbook will help a lot- this is a complex issue with a lot of variables.

Or... you can just go with the recommendations of the tube manufacturer. Most data sheets for power tubes give suggestions for load, bias, power, and distortion.
 
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