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The Echo has a strong reputation as a handsome OTL tube amp with a refined, spacious sound, and US$699 sits right in the normal used lane rather than screaming deal territory. Newer Echo pricing has ranged from about US$679 for the original U.S. retail up to US$1,099 for the MKII and US$1,249 for the Echo Vibe, so this ask is roughly fair-to-good for a clean unit, but not cheap enough to call a bargain.
What makes it worth a look is the pairing with high-impedance dynamics: Feliks rates the design for roughly 80–600 ohms, with about 350 mW output and 20 dB gain, and reviewers consistently praise its natural, smooth presentation and wide stage. If the tubes are healthy and the seller can confirm the original accessories and low hours, this is a very plausible buy for someone wanting the Feliks sound without paying new-amp money.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Feliks Audio traces its roots to Poland, where electronics engineer and audio enthusiast Henryk Feliks began designing amplifiers over 40 years ago as a passionate hobby. Around 20 years ago, he turned this pursuit commercial, selling custom-made units initially within Poland. In 2014, the second generation—sons Łukasz, Piotr, and Michał—joined the family business, elevating it into a global operation based in Lubliniec. Today, this tight-knit team of about 10 crafts products with over 25 years of accumulated expertise in tube amplification.
The brand specializes exclusively in handcrafted tube amplifiers, with a sharp focus on headphone applications. Their lineup includes output transformerless (OTL) designs like the accessible Echo, high-end models such as the Envy Susvara Edition, and even esoteric electrostatic amplifiers like the Bliss, which supports both modern and vintage headphones. Every piece is in-house engineered, tuned, and assembled, blending natural materials and unique topologies for purist performance, often doubling as preamps for active speakers.
Feliks Audio occupies a niche boutique position in the high-end hi-fi market, revered by headphone aficionados for its emotional, rewarding sonics that prioritize musicality over sterile precision. Distributed in over 20 countries through select channels, their four-figure pricing reflects premium, small-batch quality rather than mass-market volume, appealing to discerning buyers who value tradition-meets-innovation in tube-driven headphone amplification.
See all Feliks-Audio listings on RADAR.
