Loadline calculator for power stages with reactive load

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 (I am slowly adding more),
  • set the operation modality, among ultralinear, pentode, and triode mode,
  • set Single-Ended or Push-Pull configuration
  • set the Power Supply V+ 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,
  • estimates the needed cathode resistor, if you want to use self-bias

Single Ended

Push-Pull

Select a Tube:
Operating mode:
Ultralinear
Pentode
Triode
PP/SE:
PP SE
V+ (V): Grid Bias Voltage (V):
Quiescent Operating point: Iq(mA):
Vq(V):
Max Output Power (W):
Load (Ohm):
Screen Voltage (V): Cathode resistor (Ohm):
UltraLinear tap (%):

If you are not familiar with loadlines, their purpose, and their use, I suggest you checking my guide: Section 3.2 (for resistive loadlines), Section 4.1.3 (for reactive loadlines), and Section 4.2.2 (for AC loadlines).

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

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