Cathode Bias Calculator for Power Tubes

Output Valve Cathode Bias Calculator

Output Valve Cathode Bias Calculator

Note: The chart dynamically plots a range of resistor values based on your selection, typically from 50% to 150% of the chosen value in 10Ω steps. This calculator uses textbook values for dissipation limits - many amps exceed textbook values for various valves, so just be mindful of this. Textbook values are worth considering if you want to keep your vintage power tubes running as long as possible.

Suggested Bypass Capacitor (Ck) is based on -3dB rolloff at 25Hz.

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