Reactive dummy load for a small power tube amp.

Differnt from a pure resistive dummy load (high power resistor) this one folows the non linear impedance curve of a real speaker, including the resonance peak and the slow impeance rise in  the mid/high range.

RLC Dummy Load


  • maximum dissipation power 5W,
  • nominal impedance 8 Ohm,
  • 3 position Resonance switch, allows to set the resonance peak height,
  • 5 position rotary Presence switch, allows to set one of five, different impedance rise curves.


RLC dummy load schematic

RLC Dummy Load RLC Dummy Load

Demo videos / Sound Samples: