Tube Amp Bias Calculator

How it helps

Use it for a focused task

This bias calculator helps you determine safe operating ranges for tube amplifiers. Input your amplifier's B+ voltage, plate current, and tube type to get recommended bias voltage and dissipation values.

The calculator includes preset data for common tube types like EL34, 6L6, KT88, and 12AX7. Results include estimated tube lifespan, measurement tips, and adjustment procedures.

Select your tube type from the dropdown or choose custom entry. Enter your amplifier's B+ voltage (measured at the plate supply) and desired plate current in milliamps.

Good next steps

Make the result easier to act on

• Start with the examples or presets if you are unsure what to enter for Tube Amp Bias Calculator.
• Try one realistic scenario first, then adjust the numbers or notes to compare another path.
• Use save or share from the project footer when you want to return to the same helper later.
• Open a related project below when the result points to a timing, budget, writing, planning, or comparison task.