High End Class Tube Headphone Amplifier developed by famous american audio engineer Alex Cavalli in combo with dedicated premium quality tube power made by Audiobrava( UK) . Designed for work with wide variety of high quality headphones and is effective for impedances in range of 32 to 600 Ohms. Technical parameters corresponds to Hi End level of quality. Tube power supply is essential for a high quality tube based audio item like this Headphone amplifier and push quality of sound reproduction to the very high level. Both amplifier and power supply to be delivered with set of new high grade audio tubes. Technical condition is perfect and sound quality is really very high