The Luna Mini is the smallest and least expensive integrated amplifier Fezz Audio makes, and the successor to the long-running Alpha Lupi. It is a single-ended Class A valve amplifier, hand-built in Poland around a pair of EL34 output valves, and it makes 10 watts per channel. That is a small number, and the Luna Mini is built for a particular kind of system: efficient speakers, a small or medium room, and a listener who values tone, texture and presence over sheer volume. Within those limits it offers the single-ended valve sound in a well-made, compact and properly finished chassis at an approachable price.

Brief product overview

A stereo single-ended Class A integrated amplifier using two EL34 output valves and two 12AX7 driver valves, producing 10 watts per channel. Single-ended means each channel’s output is handled by one valve working alone, rather than by two valves sharing the waveform in push-pull. This is the simplest topology there is, and the source of the distinctive single-ended sound. Fezz grew out of Toroidy.pl, a toroidal transformer manufacturer, so both the power transformer and the output transformers are toroidal and potted in resin, which is unusual in valve amplifiers. Quoted bandwidth is 16Hz to 130kHz, signal-to-noise ratio is 84dB, and input sensitivity is 0.7V. The amplifier has three RCA line inputs and a subwoofer output. There is no phono stage, DAC or streaming, so every source connects at line level. A pre-heating mode warms the valves before the high voltage is applied, to extend their life, and a signal ground switch helps deal with hum in a system with several earthed components. The valves are supplied separately and numbered V1 to V4 for fitting. A metal and acrylic valve cage and an aluminium remote control are included. The chassis measures 285 x 417 x 220mm and weighs 15kg, and it comes in Black Ice or Moonlight.

How it sounds

The Luna Mini sounds the way a single-ended EL34 amplifier should: dense in tone, open and fluid through the midrange, with voices and acoustic instruments that have real body and presence. Much of a single-ended amplifier’s appeal is in the first watt, and at the one or two watts most listening actually uses, the Luna Mini is clean, quiet and engaging. The limits come with the design. Distortion rises as the amplifier approaches full power, as it does in any single-ended circuit, and 10 watts will not drive an inefficient speaker to high levels or grip a demanding bass driver. With a speaker of 90dB sensitivity or more and a benign load, in a room of moderate size, it plays at realistic levels with good scale. With a low-sensitivity speaker in a large room, it runs out of headroom quickly, and the sound hardens as it does so.

What we’d partner it with

The speaker matters more than anything else in a Luna Mini system. The Triangle Comète 40th Anniversary is a well-judged partner. It is a two-way French standmount with a horn-loaded 25mm magnesium dome tweeter and a 165mm natural cellulose paper mid-woofer. Its 90dB sensitivity and 8-ohm nominal load (4.2 ohms minimum) are exactly what a low-powered valve amplifier wants, and Triangle designs it for rooms of up to about 25 square metres, which suits the Luna Mini. Two alternatives from our range are the Klipsch Rebellion, a 95dB horn-loaded standmount that makes even more of every watt, and the Klipsch Heresy IV, a 99dB floorstander for anyone who wants more scale from the same amplifier.

For streaming, the Bluesound Node Icon is the source we would choose. It runs BluOS, which covers Tidal, Qobuz, Spotify Connect, AirPlay 2 and Roon, and it uses a dual-mono DAC with two ESS ES9039Q2M chips. It also has an HDMI eARC input for a television, which a line-only valve amplifier otherwise cannot connect to. The standard Bluesound Node offers the same streaming for less money, and the Eversolo DMP-A6 Gen 2 adds a large touchscreen and a library-management approach.

For vinyl, the Luna Mini needs an external phono stage. The Fezz Gaia Mini is the natural match: a compact MM/MC phono stage from the same maker, built around a Burr-Brown OPA2132 op-amp with a stabilised power supply, and finished in the same Fezz colours. It suits the Clearaudio Compass, which arrives ready to play with Clearaudio’s T1 tonearm and N1 moving-magnet cartridge fitted. The Rega Fono MM and Pro-Ject Phono Box S3 B are alternative phono stages, and the Rega Planar 3 and Pro-Ject Debut EVO 2 are alternative decks.

On cabling, a well-made interconnect between each source and the amplifier and a speaker cable of appropriate gauge for the run are all that is needed; AudioQuest and Chord are the cable brands we stock.

Who shouldn’t buy it

If your speakers are rated below about 88dB, present a difficult load, or have to fill a large room, the Luna Mini is the wrong amplifier. The Luna EVO keeps the EL34 sound but runs four valves in push-pull for 40 watts per channel, with switchable triode and ultra-linear modes and separate 4-ohm and 8-ohm terminals. If you listen loud, the same applies. If you want streaming, a DAC and a phono stage built into one chassis, a line-only valve amplifier means adding each of those separately; the Eversolo Play combines them in a single chassis, though as a solid-state Class D design. And valves are consumables that need occasional replacement and run hot, which is part of owning any valve amplifier.

Two opinionated systems we’d build around the Luna Mini — the source and speakers we’d actually run ourselves.

Position the Luna Mini on a firm, level surface with plenty of free air above and around it, never in a closed cabinet, as the valves and transformers run hot. Fit the valves before first use, following the V1 to V4 markings, and handle them with gloves or a clean cloth. Then fit the valve cage, particularly if there are children or pets in the home. Connect the speakers before switching on and never run the amplifier without a load attached. Use the output terminals that match the speaker’s nominal impedance; for the Comète 40th, that is the 8-ohm connection. Use the pre-heating mode at switch-on and allow a warm-up period before serious listening. Connect the Node Icon’s RCA outputs to one of the line inputs and set the Node’s output to fixed in the BluOS app, so the Luna Mini’s volume control does the work. The Gaia Mini connects to another line input, with the Compass’s earth lead attached to the Gaia Mini’s ground terminal and the phono stage set to MM. If hum appears with several components connected, try the signal ground switch. The subwoofer output is there if you add a powered sub later.