Jadis Electronics JA688

The emotion of tube sound, signed by Jadis

Special attention has been given to the power supply of the six-tube push-pull output stage. Each amplification stage benefits from its own dedicated voltage supply, preventing unwanted interaction and preserving signal integrity throughout the circuit.

To guarantee speed, stability, and dynamic response, the power stage uses a π-filter directly after rectification. The tube screens are supplied by a filtered and regulated voltage source, allowing for improved control and consistency under demanding conditions.

The driver stage also benefits from a highly filtered and stabilised power supply, delivering the precision and clarity required at this critical point in the signal path. Tube bias is rectified and π-filtered, while the tube heaters are electronically filtered to reduce noise and preserve low-level detail.

All power supplies are derived from a bespoke transformer, manufactured using high-grade materials and meticulous production methods to ensure long-term reliability and outstanding performance.

The power module has been designed to drive highly demanding loudspeakers, including models from Wilson Audio or Magico. It delivers substantial power through a six-KT170 push-pull output stage with shared bias, a configuration chosen to optimise both sonic performance and tube lifespan.

The driver stage, essential to controlling such an output section, consists of a phase splitter, a voltage gain stage, and a cathode follower to ensure proper impedance matching. The signal is then coupled to the power tubes through capacitive coupling before being processed by the output transformer, which matches impedance for optimal power transfer to the loudspeakers.