Reactive dummy load for a small power tube amp.
Contrary to a pure resistive dummy load (high power resistor) this one follows the non linear impedance curve of a real speaker, including the resonance peak and the slow impedance rise in the mid/high range.
Features:
- 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.
Schematic:
Sound samples:
Here is an interesting experiment showing what direct impact on the sound has the speaker's impedance curve (simulated by this device):
