-Class of operation - Currently class B. Variable through the 90ohm resistor. Could be set to B,AB and maybe even A with an extra pair or two of output transistors.
- Output Power - 66W/4ohm
- Drawn Power - 200W
- Efficiency - 33%
- Frequency response - 7Hz - 20Khz. Low end controlled by the 4.7mF cap and high end by 1nF cap.
- THD - 0.03%@1Khz@66W. Noise from zero point switching is higher than harmonic distortion and contributes to 90% of the THD reading. To bring the THD even lower try switching deeper into class AB mode or switching to class A mode altogether.
- Supply Ripple rejection - -80dB
⚠ Stick to the ground placement presented here to avoid ground loops.
⚠ Power supply tips - Filtering cap minimum 4.7mF recommended 15mF. Transformer should be rated 280VA with a secondary winding corresponding to 50V~55V.
