Feliks Audio Echo II


The Echo II is an output transformer-less (OTL) headphone amplifier and preamplifier featuring  6N6P and 6N1P tubes. Despite being Feliks’ entry-level amplifier, the Echo II is no slouch when it comes to presenting a highly musical and well-extended sound. The Echo II is slightly warm, smooth, intimate, and laid-back, flattering a wide range of headphones.


The qualities of the Feliks Audio Echo II, in addition to incredible build quality and brilliant engineering, amount to an amplifier that performs far beyond its class. It is fully handmade and the headphone sweet spot is for medium to high impedance headphones (from 100 ohms). It can also be used as a tube preamp for both tube and solid-state amplifiers.


  • Tube complement: 2 x 6N6P, 2 x 6N1P
  • Frequency response: 15 Hz - 45 Khz +/- 3 dB (300 ohm)
  • Optimal headphone impedance: 80-600 ohm
  • Inputs: 3 x RCA line
  • Input impedance: 100 kOhm
  • Power output: 380 mW
  • Headphone output: 6.3 mm