## Sonnet Kratos Mono Block Amplifier
**High-Voltage FET Front End Delivers Tube-like Spaciousness combined with Solid-State Control**
The Kratos mono block amplifier differs in many respects when compared to normal transistor power amps. When looking at contemporary hybrid designs where tubes drive the power output stage, soundwise, the Kratos will have lots of similarities. Like them, Kratos has an airy and spacious sound but with the control and grip of a transistor amplifier.
### No Tube Aging
A disadvantage of tube hybrids however, is the problem of aging of the triodes. To avoid this problem for our Kratos, a front end with high voltage FET transistors was designed. As a result, the measurable properties and sound signature are completely identical compared to triodes, but having the advantage that no aging occurs. A similarity is the high operating voltage to get these circuits working. The result is a high degree of linearity.
The input stage circuit drives a class A/B MOSFET output stage. Only a small amount of feedback is needed to get the correct gain while also improving the damping factor. A dedicated circuit for the high voltage is used, where the output stage is powered using a generously overdimensioned 400 Watts power supply. The phase margin and current capability of the Kratos power amplifiers is large enough to drive a 10uF capacitor, so difficult speakers can be driven without problems.
### System Integration
In addition to manual control of the amplifier, it can also be controlled via a remote cable to our Morpheus or Pasithea DAC. Another switchable option is the so-called "music sense" that checks the input for the presence of music and automatically turns the power amplifier on. After half an hour of silence, the music sense circuit will put the amplifier back into standby mode.
### Comprehensive Protection
Protections are of course part of this design such as overcurrent, offset and overheating and are monitored in real time. All relevant information is visualized on the front display, which can also be turned off from the menu so it will not distract from your listening experience. In the unlikely scenario that a fault occurs, the display will turn on and inform you of the status.