From what I have gleaned about the subject you would want to have the tube dissipate close to max. That is why I picked about 90% of max. I was using v=ir to calculate the current dissipated by the resistor.What do you want your plate Pd to be? 30W? Do you know the formula for finding cathode current?
My first resistor was 470 ohm but that was way to cold. If I recall that was about 60ma cathode current. I wanted to know what other builders had previously used in successful amps. cheers.
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