A measuring-instrument business from Yokohama.

Phasemation is the hi-fi brand of Kyodo Denshi Engineering Co., Ltd. (協同電子エンジニアリング), an electronics engineering company in Yokohama. Its company profile dates the business to March 1970 and names Nobuyuki Suzuki as chairman and Akihiko Kitazawa as president. Most of its roughly 100 staff work on in-car electronics — car audio, navigation and ETC toll equipment — designed for other companies, from first concept to mass production; audio is a smaller line.

Suzuki has told the story himself. In a 2021 interview with the trade paper Dempa Shimbun, he said that after university he worked at Aiwa, where his jobs included product inspection, and that he and a group of colleagues left — he linked it to Aiwa’s merger with Sony — to set up the predecessor company, Kyodo Denshi System. The company’s English-language history says that business began with OEM and contract production of electronic measuring instruments, took on car-electronics design work around the same time, and in 1974 began selling a magnetic-head tester under its own name. In his chairman’s column on the Phasemation website, Suzuki describes the early work as measuring instruments for magnetic recording, followed by contract design for car electronics, and says he long wanted a high-end audio brand of his own.

The present company is a later creation. In August 2004, the company says, Kyodo Denshi Engineering was split off from Kyodo Denshi System to concentrate on in-vehicle equipment; Suzuki told Dempa Shimbun that the measuring-instrument division was sold at the same time.

From coils to cartridges.

The route into audio ran through magnetics. Measuring magnetic heads depended on winding coils, Suzuki told Dempa Shimbun, and the company owned its own winding machines; he had himself wound coils for dynamic microphones at Aiwa. In the early 1990s, he said, the president of Musashino Onkyo Kenkyujo, the company behind the Koetsu cartridges, asked Kyodo Denshi to measure cartridge coils, and that work led it to make moving-coil step-up transformers. The company’s own history says it made MC step-up transformers in the 1990s for a “worldwide audio brand” it calls only “K company,” and converters for other makers it also does not name.

In April 2002 the company launched its own high-end brand, Phase Tech. Its first product was the P-1 moving-coil cartridge, with a stainless body and rosewood cover. A step-up transformer, the T-1, followed that October, and in December 2003 a valve phono stage, the EA-1, and a top-loading CD transport, the CT-1, built around a Victor mechanism. Through the decade came more cartridges, preamplifiers and passive volume controls, among them the P-3, with a duralumin body coated in diamond-like carbon.

In December 2010 the brand was renamed Phasemation, the company says, and it lists the MA-1, a valve monoblock with an 845 output tube, as the first Phasemation product. The name, it explains, combines “phase” and “information,” and its stated aim is the “reproduction of live music stage in front of the listener” — with the emphasis, its Japanese site says, on where the performers are placed.

Today the range centres on record playback: moving-coil cartridges such as the PP-500, PP-2000 and the flagship PP-5000; phono amplifiers up to the six-chassis valve EA-2000; step-up transformers; and valve amplifiers such as the MA-5000, a made-to-order monoblock with paralleled 211-type output tubes that Stereo Sound reported in May 2023 at ¥14.3 million a pair. In Stereophile’s January 2021 Analog Corner column, Michael Fremer reviewed the PP-2000, then $6,999, and described its sound as “lush” and “sumptuous.” The company lists Japanese awards for the PP-5000, including the Stereo Sound Grand Prix 2022.

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.

Still a brand inside an engineering company.

Phasemation has never been a stand-alone company. It remains the audio brand of Kyodo Denshi Engineering, whose head office is in Tsuzuki ward, Yokohama, and which also lists a subsidiary in Los Angeles. In October 2015 the audio operation moved to a separate site at Nippa, in Yokohama’s Kohoku ward, the company says; that address, in Shin-Yoshida Higashi, is the one given on both its Japanese and English websites. The same year, it says, its CA-1000 valve preamplifier received a regional industrial-technology award from the nine prefectures and cities of the Tokyo area.

The company presents itself as a maker. Its corporate website lists the manufacture and sale of audio equipment among its businesses, and the English Phasemation site says the firm’s technological root is developing and manufacturing electronic measuring instruments. We have not found an independent account of how much of each product is built at Nippa, so we leave it at the company’s word. Several of its larger amplifiers are made to order, and the company says it aims to keep products in its catalogue for as long as possible so that customers can use them for many years.

Its engineering habits have stayed consistent. Suzuki told Dempa Shimbun that the company favours fully monaural construction, sets levels with transformers rather than resistors, and mostly avoids negative feedback in its amplifiers — ideas visible in its multi-chassis phono stages and its “Control Meister” volume controls, which combine transformers with precision resistors.

For a design guide, Phasemation shows how a measuring-instrument business can turn its engineering into a hi-fi name of its own. Compare Koetsu, whose coils it once measured, and Dynavector, another Japanese cartridge maker. For this guide we use navy, graphite, aluminium and a coil copper with a sans, an unofficial interpretation; no product or logo is reproduced.

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