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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. Amplifier Tube Values. Enter the values for your amplifier below.
With the plate voltage and milliamp values go to my Tube Bias Calculator. Select your tube type, enter the plate voltage and click a Calculate button. The 5F6A is a Class AB Fixed Bias amp so 70% of max dissipation is your safe limit.
If you have a class AB amplifier that uses fixed bias and requires the setting to be changed with every tube change, this chart can help you. This is for a 6L6GC tube type with some common amp voltages and safe dissipation settings.
6L6 Author: RCA Subject: FP-1999-02-28 Created Date: 2/24/2002 7:46:40 PM ...
With a properly biased amp, the amplifier will work more efficiently and will accurately amplify the sound of the guitar, pedals, and preamp. An incorrect bias setting can result in crossover distortion, inefficiency, and can cause damage to the tubes and amplifier. This guide will cover fixed adjustable bias amps.
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. My recommended bias measurement method is the "Output Transformer Resistance Method."
6L6GC Basing Diagram. 6L6GC Basics. The 6L6GC is an octal, beam power tube. What does that mean? The octal part tells us what kind of socket the tube plugs into. It has eight pins arranged around the circumference of a circle with a diameter of about 11/16 of an inch.
