A Geneva engineer and a student project.

The name looks invented, and in a sense it is: darTZeel is an anagram of Delétraz, the surname of its founder, Hervé Delétraz — the same eight letters rearranged, with the T and Z set in capitals. The German magazine fairaudio, in a company report of March 2024, says he studied electrical engineering at the engineering school in Geneva, graduating in 1984, and then worked with LeCroy oscilloscopes, in computer importing and configuration, and in IT support for the City of Geneva’s administration before turning to amplifiers full time. As a child, it says, he wanted to build “the world’s best amplifier,” and he corresponded with the Finnish engineer Matti Otala about the sonic effects of negative feedback.

The amplifier took a long time to arrive. SoundStage!, reviewing it in May 2005, traced its roots to 1984, when Delétraz designed an amplifier without negative feedback as a student project; the circuit was developed through the 1990s, and the first unit was assembled on 11 November 1999. The finished NHB-108 Model One was shown in New York in 2002 and went on sale that year, with American sales following in 2003. “NHB” stands for “Never Heard Before.”

The company’s motto, on its website, is “Listen first, measure afterwards,” which it calls the principle by which all its products are designed. Its Geneva address has moved: Swiss register notices place the operating company at Petit-Lancy, in Lancy, when it was registered in 2017, and at Plan-les-Ouates from 2022. fairaudio described about 600 square metres there in March 2024, though it dated the move to 2023.

Gold, red, brass and glass.

darTZeel’s look is one of the most recognisable in high-end audio, and it has hardly changed. SoundStage! described the original NHB-108 in 2005 as having a gold-anodised faceplate and red heatsinks, with a dual-mono layout, two 300VA transformers and polished brass bus bars left visible inside; it rated the amplifier at 100 watts per channel into 8 ohms and 160 into 4, at a price of $18,181. fairaudio, nearly two decades later, listed the same constants — gold front plates, red heatsinks and glass tops — and Art Deco-style transformer housings with mu-metal shielding.

The range grew slowly from that first amplifier. By 2024 fairaudio listed the NHB-108 Model Two stereo amplifier at €65,000, the NHB-468 mono amplifiers at €265,000 a pair, the NHB-18NS preamplifier at €65,000, the CTH-8550 MkII integrated amplifier at €42,000, the LHC-208 MkII streaming integrated amplifier at €27,000, and a cartridge and phono stage called MC Step 1. The magazine reported that Delétraz listens to every amplifier before it ships, and that the company says the NHB-108 Model Two is designed to last about 40 years, capacitors included.

On where the products are made, the company points to Geneva. Its website lists “machining, anodising, assembling, finishing” under the heading of craftsmanship without saying which steps happen in its own workshop, and in October 2024 Delétraz wrote that “darTZeel instruments are made in Geneva to last forever.” We give both as the company’s account; we found no independent description of its suppliers. fairaudio visited darTZeel together with the loudspeaker maker Stenheim, but described them as separate companies.

Swiss hi-fi and its makers.

Switzerland’s audio reputation was built largely on professional machines. Stefan Kudelski made the first Nagra tape recorder in 1951, and it became the standard for film sound from the 1960s to the 1990s, English Wikipedia says; the brand now belongs to Audio Technology Switzerland, near Lausanne. Willi Studer founded Studer in Zurich in 1948 and registered the Revox name for consumer equipment in 1951. Thorens is older still: it was registered at Sainte-Croix, in Vaud, in 1883.

Austria’s record centres on Vienna. AKG was founded there in the late 1940s by Rudolf Görike and Ernst Pless; its owner, Harman, closed its Vienna operations in 2017. Pro-Ject, founded by Heinz Lichtenegger in 1991, designs its turntables at Mistelbach, in Lower Austria, and makes them in the Czech Republic, Slovakia and Germany.

Vienna is now the trade’s meeting place too. In September 2024 the High End Society announced that its HIGH END show would leave Munich after 2025, StereoNET reported; the first Vienna edition was held at the Austria Center Vienna from 4 to 7 June 2026.

According to their own websites, Goldmund is at Satigny and darTZeel at Vessy, both in the canton of Geneva; CH Precision is at Préverenges, near Lausanne; Soulution’s maker, Spemot, is at Dulliken, in the canton of Solothurn; Piega is at Horgen, on Lake Zurich; Revox, Swiss by origin, is now run from Villingen-Schwenningen in Germany; and Vienna Acoustics is at Weigelsdorf, south of Vienna.

This guide sets out what can be checked about each brand — who founded it, who owns it, and what it says about where its products are made — and marks clearly what rests only on the company’s own word.

Rumours in 2024, the register in 2026.

The business has been small and closely held. The operating company, darTZeel Audio SA, was registered in June 2017 with capital of CHF 100,000 and Hervé Delétraz as sole director, according to notices in the Swiss Official Gazette of Commerce; a second director sat on the board from 2018 to 2023, after which Delétraz again served alone.

In October 2024, after rumours that the company was closing, Delétraz issued a statement published by Michael Fremer’s Tracking Angle. “Not only will the darTZeel brand continue to exist, but it will also change its paradigm by focusing on new concepts,” he wrote, blaming discounting for turmoil in the extreme high-end market. Production of the NHB, CTH and LHC series would from then on be made only on demand, customer service would continue unchanged, and a new line “aimed at a broader audience” was under study.

The register tells what happened next. A notice published on 1 April 2026 says darTZeel Audio SA was dissolved following bankruptcy declared by Geneva’s court of first instance on 12 March 2026, and its name became “darTZeel Audio SA, en liquidation.” A further notice, published on 13 August 2026, says the bankruptcy proceedings were suspended for lack of assets by a judgment of 6 August 2026. When we checked in early October 2026 the darTZeel website was still online, listing five models, and its contact page said darTZeel Audio was now “operated by Cape124 Ltd,” at an address in Vessy, also in the canton of Geneva; the old Plan-les-Ouates address remained only in the page’s hidden code. We found nothing in the sources we checked explaining who is behind Cape124, or announcing the new product line, and we do not know what will become of the name.

For a design guide, darTZeel shows how a fixed pair of colours can become a brand on its own: gold and red were enough to identify the amplifiers for more than twenty years. Compare Goldmund, another Geneva maker that has changed hands, and Soulution. For this guide we use gold, red and glass black with a sans, an unofficial interpretation; no product or logo is reproduced.

Keep darTZeel’s identity on hand — save it to a board in the Made Good inspiration library.