Loadline calculator for tube amplifier power stages

This calculator allows you to compute and tune loadline and operating point of tube amplifiers’ power stages.

You can :

  • choose among most common power vacuum tubes,
  • set the operation modality, among ultralinear, pentode, and triode mode,
  • set the B+ voltage, the screen voltage, the screen tap, the quiescent bias current.

The calculator :

  • plots the anode characteristic graph, for the chosen operation modality,
  • plots the loadline,
  • highlights the operating point,
  • estimates the grid bias voltage,
  • estimates the maximum expected output power.

The underlying model and equations, for tracing tube characteristics curves, are those discussed by Norman Koren, in his web site.

To start, just select a Pentode:
Chose Operating mode:
Ultralinear
Pentode
Triode
PP or SE configuration:
PP SE
Set B+ (V): Computed Grid Bias Voltage (V):
Set Bias Current (A): Computed Max Output Power (W):
Set Reactive Load (Ohm):
Set Screen Voltage (V):
Set UltraLinear tap (%):



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