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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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Professional Reviews 91/100
Deliciously Crispy
Sound Quality
92/100
Build Quality
87/100
Value for Money
89/100
Fezz Audio’s 300B magic comes through as a spacious, richly textured presentation that favors imaging, clarity, and musical flow when paired well. Jason Thorpe found it quiet, emotionally involving, and surprisingly capable, while Audiophilepure praised its startling extension and vivid speaker match.
What Reviewers Are Saying
Pros
Delivers exceptional clarity, extension, and imaging with the right speakers.
Produces a rich, engaging midrange with a spacious, emotionally involving presentation.
Runs very quietly, with effectively silent background noise in listening tests.
Works especially well with sympathetic, higher-efficiency speakers and can make them sound larger and more defined.
&
Cons
Bass can sound rounder and less sharply articulated with more demanding speakers.
Power is limited with tougher loads, capping maximum volume and making speaker matching important.
Needs some warm-up time before it fully opens up sonically.
SOUND QUALITY PERFORMANCE 92/100
Reviewers describe a strikingly clear, extended, and emotionally engaging presentation, with the Lybra extracting notable imaging and musical flavor from the Sky Towers. The available review is especially enthusiastic about how well it matched that speaker, suggesting a highly accomplished sound that brings out both detail and character.
Transparency Resolution
94/100
The reviewer highlights the amp's clarity and extension, saying it 'excavated' these qualities from the speakers and 'startled' them with what it revealed. That language points to a very transparent, revealing presentation with plenty of low-level insight.
Tonal Balance Musicality
92/100
The review emphasizes 'flat-out flavor' and speaks in strongly musical terms, suggesting a presentation with genuine tonal interest rather than dryness. It sounds engaging and vivid, with the kind of character that made the reviewer rethink value in audio.
Dynamics
90/100
Although the review does not dwell on power delivery in technical terms, the enthusiastic reaction and the praise for how convincingly it drove the Sky Towers imply easy authority with the right speakers. The 300B-based design and modest output mean it is best understood as potent within a suitable pairing rather than universally forceful.
Soundstage Imaging
94/100
Imaging is singled out directly, and the reviewer groups it with clarity and extension as a standout strength. The amp appears to create a spatially convincing, highly resolved presentation that impressed enough to inspire a strong recommendation for the pairing.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
87/100
The reviews themselves say little about workmanship, heat management, or long-term reliability, so there is not much listening-based build commentary to go on. The documented implementation does show serious engineering intent, with a parallel single-ended 300B circuit, autobias, balanced operating on 4/8 ohm outputs, and a substantial 23.5 kg chassis, which together suggest a carefully executed design.
Value for Money
89/100
The reviewer explicitly says the sound made them 're-evaluate the concept of value in audio' and implies the Lybra can justify a serious speaker search around it. At around $5,995, it reads as a premium purchase, but the praise suggests it offers enough musical payoff to feel well judged rather than merely expensive.
Reviews
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Verified Dealers
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Authorized dealers for Fezz Audio Lybra 300B
- The Music Room — online and in-store — Erie, Colorado, United States (website)
- 110Hz — online and in-store — Kielce, Województwo świętokrzyskie, Poland (website)
- 138 Quaiduson — online and in-store — Lille, Hauts-de-France, France (website)
- Acoustic Technologies — online and in-store — Montréal, Québec, Canada (website)
- Akustik Strauss — in-store — Garmisch-Partenkirchen, Bayern, Germany (website)
- Alma Music & Audio — in-store — San Diego, California, United States (website)
- Altitudo Audio — online and in-store — Winnipeg, Manitoba, Canada (website)
- Anagram Audio — online and in-store — Bury St Edmunds, England, United Kingdom (website)
- Atelier 13 Audio — in-store — Forest Hills, Tennessee, United States (website)
- Audeos — online and in-store — Żywiec, Województwo śląskie (website)
and 58 more verified dealers