TrueC Super500W — A High-Performance 1 kW-Class True-Complementary Symmetrical Power Amplifier

The Super500W is built around a fully discrete True-Complementary signal path, anchored by a wide-bandwidth front end, a high-swing VAS, and an eight-pair NJW output stage operating on ±96 V rails or at ±92 V loaded. The architecture emphasizes symmetry, phase discipline, and clean recovery, allowing the amplifier to maintain stability and low distortion even at high power levels. A thermally disciplined bias network ensures consistent quiescent current, while the global feedback loop is tuned for wide bandwidth without relying on aggressive compensation. The result is a high-voltage, high-headroom platform that behaves predictably under real-world loads. A true-complementary output stage preserves the symmetry of the signal from input to output, reducing crossover artifacts and maintaining linearity across the entire operating range. By using matched NPN and PNP devices in mirrored roles, the topology avoids the inherent imbalance of quasi-complementary designs and delivers cleaner harmonic structure, more consistent phase behavior, and smoother recovery from overload. In a high-voltage, wide-bandwidth amplifier like the Super500W, this symmetry becomes a core advantage—enabling clean swing, stable feedback, and a sonic character defined by low-order harmonics rather than compensation-induced artifacts. For more information email [email protected] Safety Disclaimer: This project uses high-voltage rails and large reservoir capacitors. Incorrect handling can be dangerous. The information here is intended for experienced builders and is not a step-by-step beginner guide. However, if you’re a newer builder who has built up enough skill and confidence to take on more advanced designs, you’re welcome to study the project and learn from it. Just make sure you fully understand the risks and follow proper safety practices at all times.