Power amplifiers stereo — Fezz Audio Fezz Lybra 300B

The Fezz Lybra 300B is a distinctive single-ended-triode stereo power amplifier from Fezz Audio, built around the celebrated 300B output tube with a modest, characterful power output. The Fezz Lybra 300B brings Fezz Audio's most storied engineering heritage to dedicated single-ended-triode power amplification.

Key specs that matter

Output power is a modest 15W into 8 ohms - a classic single-ended-triode figure reflecting the celebrated 300B tube's characteristic power ceiling. Frequency response spans 15Hz to 60,000Hz within plus-or-minus 3dB. Total harmonic distortion plus noise is under 0.25% at 100% global feedback. Maximum power consumption is 180W. At 420 x 380 x 226mm and 23.5kg, the Fezz Lybra 300B's considerable weight reflects serious internal transformer engineering consistent with quality single-ended-triode design.

Sound and use context

Expect the exceptionally rich, harmonically resonant character single-ended-triode 300B amplification is broadly celebrated for among tube enthusiasts, with the modest 15W output best suited to notably efficient loudspeakers.

Pairing

The modest 15W output pairs best with notably efficient loudspeakers to achieve satisfying dynamic headroom, given the inherent power constraints of single-ended-triode design.

Alternatives

Fezz Audio's own Fezz Mira Ceti 2A3 offers a related single-ended-triode alternative built around the 2A3 tube within the same broader catalogue.