The Feliks Audio Echo Classic is the most accessible way into the Feliks Audio tube amplifier lineup. Built as the purest expression of the Echo concept, it keeps the focus exactly where it should be: handcrafted Polish tube amplification, a warm and natural presentation, and strong synergy with high-impedance headphones. As a simplified version of Feliks Audio’s best-selling Echo platform, Echo Classic is made for listeners who want the tube experience without paying for extras they may not need. It delivers the rich midrange texture, smooth treble, spacious imaging, and easy musicality people expect from a well-built OTL tube amplifier, all in a compact desktop design with classic wood side panels. Pure Tube Sound, Made More Accessible Echo Classic is designed as a gateway into premium tube audio. It is not overloaded with features, switching options, or unnecessary complexity. Instead, Feliks Audio has stripped the formula back to the essentials: a clean signal path, a proper OTL tube circuit, carefully chosen tubes, and enough power for the high-impedance headphones that pair best with this kind of amplifier. The result is a headphone amp that feels immediate and inviting. Vocals have body, instruments carry natural texture, and treble stays smooth without losing air. It is the kind of sound that makes long listening sessions feel relaxed and immersive rather than clinical or fatiguing. Built for High-Impedance Headphones Echo Classic is optimized for headphones from 80Ω to 600Ω, making it a natural match for many of the dynamic-driver headphones that tube amp fans love most. With 350mW of output power and 20dB of gain, it has the voltage swing and character needed to bring out the richness, scale, and tonal density that make high-impedance headphones so rewarding. This is where OTL tube amplification makes the most sense. Pair Echo Classic with the right headphone and you get a presentation that feels open, full, and human, with a touch of warmth that flatters without smearing the music. Classic OTL Character OTL stands for output transformerless, a tube amplifier design that removes the output transformer from the headphone signal path. For the listener, that design can translate into a more direct and expressive tube sound, especially with medium to high-impedance headphones. Echo Classic uses a pair of driver tubes and a pair of power tubes to deliver the kind of sound Feliks Audio is known for: smooth, spacious, slightly warm, and naturally detailed. It gives music a sense of weight and flow without making the amp sound slow or overly soft. Simplified Construction, Feliks Craftsmanship The Echo Classic is intentionally simple, but it does not feel basic. It is handcrafted in Poland with the same attention to fit, finish, and long-term reliability that defines Feliks Audio’s higher-end amplifiers. The compact metal chassis and wood side panels give it a timeless desktop look that feels equally at home in a focused headphone system or a smaller office setup. By keeping the design streamlined, Feliks Audio makes the Echo Classic easier to place, easier to use, and easier to recommend as a first serious tube amplifier. No clutter, no unnecessary extras, just the core tube experience done properly. Key Features Entry-level Feliks Audio OTL tube headphone amplifier More accessible version of Feliks Audio’s best-selling Echo platform Designed for high-impedance headphones from 80Ω to 600Ω Classic warm tube sound with smooth treble and rich midrange texture 350mW output power 20dB amplification level 15Hz to 45kHz frequency response 6.3mm headphone output Pair of driver tubes and pair of power tubes included Compact desktop chassis with wood side panels Handcrafted in Poland Simple, focused design with no unnecessary extras Technical Specs Product Type OTL tube headphone amplifier Input Impedance 100 kΩ Recommended Headphone Impedance 80Ω to 600Ω Frequency Response 15 Hz to 45 kHz, +/- 3 dB Power Output 350mW Amplification Level 20dB THD 0.4% at 300Ω, 20mW Headphone Output 6.3mm jack Tubes 1 pair of driver tubes, 1 pair of power tubes AC Voltage 120V or 230V Weight 3.5 kg Dimensions 26.8 x 21.7 x 11.8 cm What’s in the Box Feliks Audio Echo Classic tube amplifier 1 pair of driver tubes 1 pair of power tubes AC cord User manual Warranty card
