Audiophilepure

In practice, therefore, Class A Kora amplifiers operate in two modes: nominal current, which corresponds to the device’s maximum power, and a more economical mode in which the current is reduced by half. Selection between these two currents can be done manually or automatically. The “auto” mode allows the amplifier to operate at a reduced current, but with an automatic switch to high current mode if the signal requires it, for example, fortissimo. The transitions are inaudible.

Operating in pure Class A has another advantage: because the signal comes from 60 output transistors, the power stage is insensitive to current-feedback phenomena, whether imposed by the speaker’s crossovers or by the drivers. The amplifier offers exceptional stability with complex loads, even if they are highly capacitive.

To transfer the audio signal from the SquareTube (voltage) section to the power (current) section, Kora has created a pure-analog voltage-to-current converter without any semiconducto