Pure 300B Character

A single-ended Class A valve amplifier created around the natural, expressive sound of the legendary 300B triode.

The Fezz Audio Mira Ceti 300B is designed for listeners who value tonal richness, openness and musical involvement above sheer output power. Its directly heated 300B valves deliver 8 watts per channel, making the amplifier particularly well suited to sensitive loudspeakers and carefully matched two-channel systems.

Rather than chasing specification figures, Mira Ceti 300B focuses on the qualities that have made this valve type so highly regarded: a full, textured midrange, smooth high frequencies and an effortless sense of space around voices and instruments.

Single-Ended Class A Engineering

A simple signal path and toroidal output transformers preserve clarity and natural musical flow.

Mira Ceti 300B uses a Single-Ended Class A topology with two 300B output valves supported by a pair of 6SN7 tubes. Fezz combines this traditional circuit approach with specially developed toroidal output transformers, helping the amplifier maintain wide bandwidth and stable performance while retaining the distinctive character of directly heated triodes.

The result is a presentation particularly suited to vocals, jazz, acoustic and classical recordings, where texture, timing and tonal nuance matter more than high output power.

Designed for Natural Musicality

The amplifier combines warmth and body with enough control to keep recordings clear and well defined.

Its 20Hz–65kHz frequency response allows the Mira Ceti 300B to reproduce both low-frequency weight and delicate upper-frequency detail without sounding constrained. The 300B output stage gives music a spacious, fluid quality, while the carefully controlled circuit helps maintain dynamics and bass definition.

Automatic bias adjustment keeps the output valves operating correctly without requiring regular manual calibration, making ownership more straightforward than with many traditional valve amplifiers.

Built for a Focused Hi-Fi System

Simple connectivity keeps the emphasis on the shortest possible signal path.

Three RCA inputs provide connections for conventional analogue sources, while separate 4Ω and 8Ω loudspeaker outputs allow appropriate matching with different speaker loads. Optional system upgrades can also include a pre-in connection, Bluetooth module, remote control and protective tube cage depending on configuration.

Mira Ceti 300B is ultimately a specialist amplifier: modest in output, but capable of exceptional intimacy and tonal expression when partnered with the right loudspeakers. For listeners drawn to the distinctive qualities of 300B amplification, it offers a beautifully focused route into true single-ended Class A sound.