89%
Fezz Audio Lybra 300B
An amplifier designed for the most demanding enthusiasts of 300B tube sound. The unprecedented PSE structure operating in class A was built using the highest quality toroidal transformers, designed especially for this amplifier. This guarantees linearity and wide frequency response. Extended tube life is ensured by delayed anode voltage switching. The unique tone of the 300B tubes is free, spacious and very involving.
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Fezz Audio Lybra 300B
The Lybra 300B is a low‑power, high‑sensibility stereo tube integrated that pairs classic 300B warmth with modern engineering. Fezz's PSE parallel single‑ended topology and dual 300B per channel deliver about 2×15W, producing a lush midrange, extended treble and impressively precise imaging when mated to sympathetic speakers. Reviewers including Jason Thorpe and Audiophilepure praised its clarity, depth and near‑silent background, while noting the chassis and toroidal transformers contribute to robust build and low noise. The Lybra is auto‑biasing and user‑friendly, best suited to efficient or well‑matched speakers and listeners seeking a richly textured, holographic midband. For those prioritizing presence and tonal flavor over brute power, the Lybra offers a compelling, high‑value tube experience.
Pros
- Exceptional imaging and extension that produces focused, lifelike instrument placement and depth.
- Rich, musical midrange and refined treble that deliver texture and presence without obvious harshness.
- Solid industrial design and thoughtful engineering (toroidal transformers, sturdy chassis, auto‑bias) yielding a very low noise floor.
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Cons
- Limited output/headroom for demanding, low‑sensitivity speakers—can run out of loudness and bass articulation with very large speakers.
- Basic connectivity (three unbalanced RCA inputs only), so users needing digital, balanced, or headphone features will need external components.
Sound Quality
89/100
Dynamics
86/100
Dynamics are very good for a low-power tube (2x15W PSE 300B) design: transients are lively and controlled within the topology's headroom limits, and the reviewer never reports strain or clipping. Score reflects strong dynamic behavior relative to the amplifier's tube class and power, while acknowledging inherent headroom limits versus higher-power solid-state designs.
Soundstage Imaging
94/100
The reviewer repeatedly praises imaging and extension ('clarity, the extension, the imaging'), noting the Lybra's ability to produce focused, well-defined images and an impressively wide/deep presentation. This consistent praise supports a top-tier imaging score for its class, especially when paired with sympathetic speakers.
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Build Quality
89/100
Physical specs (23.5 kg chassis, tube complement with autobias) and the review's premium framing imply solid component selection and mechanical robustness. The review does not include a teardown or detailed parts list, so the score reflects a high-quality, well-built impression without independent verification of internal parts or transformer sizing.
Features Connectivity
80/100
Very basic connectivity: three RCA line inputs only (no phono stage, no digital inputs, no balanced/XLR, no headphone output, no streaming). Per the features baseline this is a minimal modern integrated tube amplifier feature set, so it sits at the baseline score.
Value for Money
90/100
Reviewer explicitly states the Lybra made them 're-evaluate the concept of value in audio' and recommends purchasing it with compatible speakers, framing the product as a justified premium purchase. Despite the relatively high asking price for a tube integrated, the reviewer’s strong endorsement and language that the combination 'startled' them supports a 'justified premium' valuation.
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