Class A Hybrid - tube/fet amplifier
Heros is an unusual two stage hybrid transformer loaded amplifier.
Based on our design concepts and experience it features a tube input stage providing the necessary voltage amplification followed by transformer loaded cascaded jfet/mosfet output stage taking care of current gain.
No solid state amplifiers designer would attempt to use a transformer for speaker output as the the whole concept of solidstate amplifiers is to avoid it.
The numerous benefits from using an output transformer are usually ignored mostly due to cost reasons.
Yet the result speaks for itself.
Almost double the efficiency of a normal Class A design, no DC on output and many other benefits are taken advantage of in our implementation. Like a fully differential (balanced) architecture using an input phase splitting transformer and summing back at the push pull output transformer. This solution completely floats the inside of the amplifier isolating it from any external influences.
The design being fully differential is immune to power supply noise, but still we use our flagship current source shunt regulator for the input stage.
The power supply for the output stage uses a new breed of rectifier diodes using a new material called Silicon Carbide. They have no reverse current and switching loses.
When properly applied the rectifier produces no EMI/RFI in the chassis. The result is an amplifier free of grain and frizziness, giving new meaning to transparency and tone.
Operating all devices in class ‘A’ produces a fair amount of heat. The design of the chassis is such as to cope with the heat and yet to provide vibration free structure for the components. All the electronics are enclosed in separate compartments as not to interfere with each other.
Blending this with stylish aesthetics produced a beautiful sculpture - To be known as Heros.
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