The ZOTL 40 is hand-built with premium components in Washington, DC.  

A new amp by Linear Tube Audio and David Berning, the ZOTL40 is a worthy flagship and a triumph of design. The ZOTL40 Power Amplifier provides two 40W outputs with accurate, uncolored sound and automatically protected circuitry. With such rapid response, detail, and absence of tube bloom typical of other tube amplifiers, the ZOTL40 Power Amplifier sets itself apart as best-in-class, producing an unforgettably palpable and poignant listening experience.


  • Designed by David Berning - one of the world’s premier amplifier designers
  • Hand-wound coils & impedance converters
  • 40 watts per channel with little or no hum
  • Frequency response flat from 8 hz to almost 50K hz
  • Transformer-less design eliminates intermodulation distortion inherent in all transformer designs
  • Impedance converters simulate correct theoretical output transformer turns ratio
  • Low impedance output easily matches a wide range of speakers and cannot be damaged with no load
  • No adjustments – tubes are auto-biased
  • Automatic protection circuitry
  • High voltage turn on delay to maximize tube life
  • 10 - 20 years tube life depending on use
  • Push-pull, Class AB output stage
  • No heavy power or audio transformers
  • Universal voltage power supply (autosensing 100-240VAC 50/60Hz)
  • Has one input through Alps volume control
  • Second set of inputs bypass volume control for direct input
  • Uses 4 EL-34s, 2 12AU7s, 2 12AX7s - all premium Tung-Sol tubes (Russian)
  • One year warranty including tubes (international buyers pay shipping)


Power Output: 40W per channel stereo

Input Sensitivity: 1.3V

Frequency Response: 8hz to 50Khz