The Genus integrated is 25W in Class A1 yet only has two gain stages. It takes key design ideas from our Concero 25 monoblock circuit. It is effectively a small stereo SET amplifier driving a bigger stereo SET in one chassis.
The input / driver stage is a small 0.7W SE amplifier built around the Siemens E280F super triode and is loaded with a double c-core bifilar wound interstage transformer. This single tube stage offers maximum linearity and bandwidth for maximum transparency. No coupling capacitors are present anywhere in the circuit.