Italian company Audiozen Audio has introduced a two-unit stereo amplifier Lysios with output stages on silicon carbide-based Si-C MOSFET transistors. Earlier in the same concept, the Audiozen Mono monophonic amplifier was made. Until that moment, the Audiozen Lysios amplifier had output stages based on IGBT transistors – bipolar transistors with an insulated gate. Now, following the Mono monoblock, these transistors have been replaced with Si-C MOSFET based on silicon carbide.
Silicon carbide is characterized by the highest strength and the ability in MOSFET technology to provide an increase in switching speed – MOSFET Si-C transistors are three times faster than classic silicon MOSFET transistors, and the minimum input and output currents of elements based on silicon carbide are an order of magnitude lower than that of ordinary MOSFET. The high thermal conductivity of silicon carbide, which is about three times higher than that of silicon components, has reduced the design requirements of the cooling system.
To use the new transistors in the Lysios amplifier, Audiozen engineers redesigned a balanced output stage circuit operating in class AB. The Baksandall diode is also used in the quasi-complementary circuit, which eliminates the local Miller effect and is designed to provide improved linearity in the high-frequency range.
Recommended cost in Europe of the Audiozen Lysios amplifier is 3,420 euro.