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This webpage offers two ways to calculate tube bias and plate dissipation. For amps with cathode bias resistors you can simply measure their voltage drop and use the Tube Dissipation Using Cathode Resistor Voltage Drop calculator.
Biasing Tube Amplifier Calculator. Use this calculator to determine the bias current for an amplifier’s power tubes. Enter the plate voltage and type of power tubes to get the bias current at various levels of plate dissipation.
Optimize your amp's performance with our Tube Bias Calculator. Accurately calculate bias voltage and current for power tubes. Get started today!
CALCULATE PLATE DISSIPATION (In Cathode Biased Output Stage) Based on Voltage and Resistance Readings. In these calculations, 5% of the cathode current is assumed to be screen current. With multiple tubes sharing the same cathode resistor, this calculator assumes the tubes are fairly well matched. How many tubes share the same cathode resistor?
Select your tube type and amp class (Class A, Class AB Low, Class AB, or Class AB High) and enter your Plate Voltage or B+. The calculator will give you the bias current for each tube. Use this as a guide for setting your bias.
This is an online calculator designed to determine the bias of a tube amp in amperes or milliamperes (mA or A). Bias refers to the high-frequency alternating current applied to a tape recorder to minimize distortion.
Biasing Tube Amplifier Calculator. Use this calculator to determine the bias current for an amplifier’s power tubes. Enter the plate voltage and type of power tubes to get the bias current at various levels of plate dissipation. Enter the values for your amplifier below.