ZOTL40 Power Amp

LTA Reference Power Amp


We are excited to be able to offer Linear Tube Audio components, all of which are designed & manufactured in America. Plus we designed and make the chassis for LTA with Fern & Roby's aesthetic approach shaped around our love of materials & processes to make you want to look at & touch this beautiful amp as much as you will want to listen to it! You can learn more about our contract Design & Manufacturing services at our shop Tektonics Design Group!

The ZOTL40 Power Amplifier is hand-built with premium components in Takoma Park, MD  by Linear Tube Audio and David Berning, one of the world’s premier amplifier designers.  The ZOTL40 Amp provides 40+ watts per channel outputs with accurate, uncolored sound and automatically protected circuitry.  The hand-wound coils & impedance converters delivers 40 watts per channel with little or no hum and the frequency response flat from 8 hz to almost 50K hz.  Also, the transformer-less design eliminates intermodulation distortion inherent in all transformer designs.  The ZOTL40 Mk.II sets itself apart from its peers, producing an unforgettably palpable and poignant listening experience, it also comes with a one (1) year warranty including tubes. 


  • Sensitivity: 1.2V RMS for 40 watts output
  • Output impedance 1.6 ohms
  • Input impedance: 50k
  • 100V / 120V / 240V operation: Auto-swg
  • Hum and noise: 94dB below full output (measured between 20Hz-20kHz)
  • Power output with 4-ohm load: up to 51W, 0.5% THD
  • Power output with 8-ohm load: up to 46W, 0.5% THD
  • Frequency response (8-ohm load): 8Hz to 50kHz, +0, -.5dB
  • Amplifier class: Push-pull Class AB
  • Net weight: 15 lbs
  • Finish: Aluminum case
  • Tube complement: two 12AX7s, two 12AU7s, and four KT77s
  • Push-pull, Class AB output stage
  • No adjustments – tubes are auto-biased


H - 5.9", W - 17", L - 14.5" (including binding posts)

Contact us to discuss options

or call:
(804) 233 - 5030