David Berning

Established in 1974, The David Berning Company manufactures tube audio amplifiers utilizing the patented ZOTL Impedance Conversion Technology that properly matches high impedance vacuum tubes to the low impedance realm of speakers without the use of traditional audio power output transformers or numerous paralleled output tubes common in traditional OTL designs. The ZOTL Technology and David Berning's numerous other products have been reviewed over the decades by substantial publications including Stereophile Magazine, Audio Magazine, and The Absolute Sound. In continuous operation for over 40 years, the David Berning Company is among the oldest in audio manufacturing. Hi-Fi+ Magazine awarded Berning's Quadrature-Z "Power Amplifier of the Year 2009". Other notable technologies pioneered and patented by The David Berning Company include Screen Drive and Tube + FET Hybrid technologies.