Feliks Audio Eos – 300B Tube Amplifier for Headphones and Speakers

Polish manufacturer Feliks Audio has revealed new details about its flagship Eos amplifier, a prototype of which was shown at High End Vienna 2026. The new model sits above the Envy series and is designed not only for dynamic and planar magnetic headphones, but also for driving loudspeakers. Electrostatic headphones, meanwhile, remain the domain of the dedicated Bliss amplifier.

At the heart of the Feliks Audio Eos are directly heated 300B triodes, although the manufacturer has yet to disclose the exact architecture of the amplification stages. One of the key development goals was to reduce the amplifier’s inherent noise: according to Feliks Audio, the noise level is approximately ten times lower than that of the most advanced Envy configuration. This is particularly important when using sensitive dynamic headphones and in-ear monitors. The company also claims the widest operating frequency range of any Feliks Audio amplifier, although full technical specifications have not yet been published.

Particular attention has been paid to the electronic monitoring system. A display on the front panel shows the amplifier’s operating parameters, while the prototype allowed users to monitor the remaining life of each tube, tube socket temperature and bias parameters in real time. In this way, the Eos combines a classic tube-based design with a modern monitoring system that could simplify maintenance and make it easier to keep track of tube condition.

The Eos is the first Feliks Audio amplifier designed from the outset for both headphones and loudspeakers. Output power for speakers has not yet been announced, so the amplifier will most likely be best suited to relatively sensitive loudspeaker systems. The model supports remote control and is available with wooden side panels, including oak and American walnut finishes. The recommended retail price of the Feliks Audio Eos headphone amplifier in Europe is €11,999.