SDS Labs Headphone Amp (solid state)

This little headphone amp uses a push-pull Class A MOSFET output stage, being driven by an op-amp. The output stage is included in the op-amp feedback loop, so the distortion figures are amazingly low. The power supply uses a 25 watt toroid transformer, and two adjustable regulators. It sounds very good; surprisingly un-solid state.

Headphone amp article preview.