An ex-Luxman engineer’s workshop in Amagasaki.

Leben is often filed as a Tokyo maker, but it is not: every address it and its Japanese distributor give is in Amagasaki, the industrial city in Hyogo Prefecture between Osaka and Kobe, and the Japanese press calls it a valve-amplifier brand “from Hyogo.” Its founder is Taku Hyodo (兵頭卓), an engineer who, the company says, worked for Luxman before going out on his own, and who had once played guitar professionally.

The company’s English history says Hyodo left Luxman in 1979, at the age of 30, to set up Kouri Denki, a business making electrical and electronic components, parts and printed circuit boards. Alongside that work he kept building valve amplifiers under the KFH name, mostly to order for cafés, bars and restaurants. A member profile published by a Hyogo non-profit, of a man who worked there from 2007 to 2015, also names the firm as Kouri Denki, with Hyodo as founder and president, and says it was later renamed Leben Kobo — “Leben Workshop.”

The first KFH product sold more widely was the Triode 33, a power amplifier built around the 3C33 valve. The same company page dates it to 1991 in its text and to 1992 in its product list, and the American magazine Positive Feedback has written that the firm was founded in 1992, so we give the dates as the sources do. The first amplifier under the Leben name was the RS-35a, a 6L6GC power amplifier, in 1995, followed by the RS-28c preamplifier in 1998. That 1995 start fits Stereo Sound’s report in November 2024 that the brand would mark its 30th anniversary in 2025.

“Leben” is German for “life,” the distributor’s brand story notes.

Self-bias, natural wood and a green band.

The distributor’s brand story sets out the idea behind the name: valve amplifiers are known to be expensive, and Leben wanted to make one that was good value without cutting corners — and, it adds, to make it in Japan rather than overseas. Its output transformers, from the CS300 onwards, are custom-made by a Japanese transformer specialist that it does not name and that, it says, sells nothing under its own name.

Every Leben amplifier uses self-biasing (cathode bias). The company accepts the cost — about 20 percent less output than a fixed-bias design, the brand story says — so that owners can change valves without adjusting the bias and the circuit stays stable. That made it easy for later models such as the CS600 integrated amplifier and the CS660P power amplifier to accept different types of output valve.

The look is just as settled. The brand story says wooden exterior parts are “Leben’s way,” made of solid natural wood rather than veneer, and that the box-shaped integrated amplifiers and preamplifiers carry a green band above and below the front panel to give a compact, sharp image. That combination — a light panel, green stripes and wooden sides — is the clearest visual signature the brand documents.

The best-known models followed in the 2000s: the CS-200 power amplifier in 2001, the EL84-based CS300 integrated amplifier in 2003 and its CS300X versions from 2005, the CS600 in 2005 and the RS-30EQ phono stage in 2008, according to the company’s product history. The American magazine Stereophile reviewed the CS300, a 12-watt-per-channel EL84 amplifier, with the RS-30EQ in its November 2011 issue, in a comparison by Art Dudley that also took in amplifiers from Quad and Luxman. The company’s own news page lists further awards from French, German, Polish, British and American magazines between 2007 and 2010, which we give as its claims.

Japanese boutique hi-fi.

Japan supports many small hi-fi makers, and several in this guide were started by people from the big names. Air Tight’s founder, Atsushi Miura, had been at Lux, now Luxman, before he set up A&M in 1986, according to a 2017 Phile Web interview. Leben’s Taku Hyodo also worked for Luxman, his company says, and Soulnote’s parent, CSR, was founded in 2004 by former members of Marantz Japan, according to Soulnote.

Others came from outside hi-fi. Aurorasound’s Shinobu Karaki spent almost 30 years at Texas Instruments Japan, his company says; Phasemation belongs to Kyodo Denshi Engineering, mainly an automotive-electronics firm; Kiso Acoustic was founded by a collector, Toru Hara.

Valve amplifiers remain central to this world: Zanden says it mainly makes products that use vacuum tubes, Leben calls itself a maker of tube amplification, and Air Tight says it holds to valve amplifiers. The Tokyo publisher Stereo Sound, whose founder held that no measuring instrument surpasses human sensibility, Japanese Wikipedia says, ran a quarterly devoted to valve equipment until October 2025. Its Grand Prix counts for small makers: Kiso Acoustic’s HB-1 won in 2009, and Phasemation says it was honoured in 2025.

The seven are not gathered in one district. Air Tight is in Takatsuki and Zanden in Kishiwada, both in Osaka Prefecture, and Leben in neighbouring Amagasaki; Phasemation and Aurorasound are in Yokohama, Soulnote elsewhere in Kanagawa, and Kiso Acoustic in Nakatsugawa, Gifu, according to their own websites and listings.

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.

The founder retired; the workshop carried on.

Leben is no longer Hyodo’s one-man project. In June 2020 the Japanese site Phile-web reported that the founder, Taku Hyodo, had retired about seven years earlier, and that the business had then continued, at the request of European and American dealers, as Leben Kobo, shipping more than 200 amplifiers a year to more than 45 countries. In Japan, sales had been suspended for some years; the distributor, Hino Enterprise, still says domestic sales are paused “for various reasons” apart from some models. We have not found who owns or runs Leben Kobo today.

Domestic sales returned with the CS600X, a revised CS600 priced at ¥780,000 before tax, which Phile-web described in 2020 as “completely made in Japan.” It takes four EL34 output valves as standard, but internal switches let it run 6L6 or KT88 types instead, and it offers 4, 6, 8 and 16-ohm speaker taps and a headphone mode. In November 2024 Stereo Sound reported the CS300XS, a refined CS300, at ¥572,000 including tax, also described as made in Japan, with delivery three to four months after ordering. The CS600X has since been reviewed abroad by What Hi-Fi? and Australia’s StereoNET.

The company’s English website, whose news stops in 2013, says all Leben products are made by hand with point-to-point wiring and “are still made in Japan.” We give that as its claim, supported by the Japanese press reports above, and note that its contact page and the distributor give different street numbers in the same Amagasaki district.

For a design guide, Leben shows how a small maker can keep one look — wood, a light panel and a green band — for three decades. Compare Luxman, where its founder trained, and Air Tight, another Kansai valve-amplifier maker. For this guide we use a deep green, natural wood and champagne with a serif, an unofficial interpretation; no product or logo is reproduced.

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