A chapter of HFR’s Complete Buyer’s Guide to High-End Audio
TechDAS is the turntable brand of Japanese distributor Stella Inc., founded in 2010 by Hideaki Nishikawa — the engineer who designed Micro Seiki’s reference SX-8000 turntable in the 1980s before spending two decades running Stella as a high-end distributor. The Air Force series applies the air-bearing and vacuum-hold-down principles he proved out at Micro Seiki, refined with thirty additional years of development.
This guide covers what to know before buying a used TechDAS: the Nishikawa/Micro Seiki history, how the technology works, the current Air Force lineup from the V Premium to the $450,000 Air Force Zero, and how to buy well on a thin, low-volume used market.
Nishikawa earned a mechanical engineering degree in 1963 and joined Stax Ltd. the following year, working on manufacturing engineering and the development of Stax’s electrostatic headphones. He left Stax in 1973 and, with former colleagues, founded an OEM company designing and manufacturing audio products for other brands — including electrostatic headphones and a tonearm for Micro Seiki.
In 1980, Nishikawa joined Micro Seiki directly, as manager of the technical department and later Sound Business Director. The statement product he planned and designed during this period was the SX-8000 system turntable — a large-mass belt-drive design using an air-bearing platter and vacuum record hold-down, features that were unusual even at the flagship tier at the time. Micro Seiki wound down as a turntable manufacturer in the CD era; Nishikawa’s SX-series designs remain sought after on the used market four decades later.
In 1989, Nishikawa co-founded Stellavox Japan Inc. with Yasuo Nakanishi to import and distribute high-end audio in Japan. Nishikawa became CEO in 1994, and the company was renamed Stella Inc. in 2012. Stella has distributed brands including Brinkmann, CH Precision, Constellation, and Vivid Audio in Japan over its history.
Nishikawa founded TechDAS in 2010 as Stella’s in-house turntable brand, twenty years after his last Micro Seiki design. Asked about the gap, he told Hi-Fi+ that the wait was deliberate — he wanted the underlying pneumatic and compression technology to mature before starting. The Air Force One prototype followed, debuting publicly at CES in January 2013. Stereophile reviewed it in its April 2013 issue, and it went on to hold a Class A+ rating in Stereophile’s Recommended Components for six consecutive years. The line has expanded steadily since: the Air Force Two, III, and V, Premium variants of each, the flagship Air Force Zero unveiled in Tokyo on March 16, 2019, and the Air Force IV, previewed at Munich High End and released in April 2026.
TechDAS’s design approach, in Nishikawa’s own framing, starts from a rejection of coloration rather than the pursuit of a signature sound. “I just wanted quality,” he told Hi-Fi+ of the Air Force One. “I started by trying to remove character from the [design].” Every Air Force turntable descends from the same handful of engineering commitments.
The main platter floats on a thin cushion of compressed air rather than resting on a conventional bearing, eliminating contact-bearing rumble and providing near-frictionless rotation.
A double-lipped seal draws the record flat against the platter when the vacuum is engaged — the same principle a cutting lathe uses on the lacquer master. Per TechDAS, the vacuum also damps vibration, not just flattens warp.
TechDAS designs its own air compressors rather than using off-the-shelf pneumatic pumps. “The secret is compression,” Nishikawa told Hi-Fi+. TechDAS uses a custom solenoid-valve system with extremely small air holes and an air condenser to cancel ripple, rather than the lower-cost aquarium-style pump some competitors use.
TechDAS builds platters in stainless steel, gunmetal, titanium, and tungsten depending on model and tier, because each material has a distinct effect on the sound. The flagship Air Force Zero's 100 kg platter stack is five layers: forged SUS 316L stainless steel for the bottom three, cast gunmetal for one middle layer, and a titanium (or optional tungsten) top layer, on a 3-phase AC synchronous motor made by Papst in Germany.
The Air Force 10 tonearm applies the same air-bearing approach to horizontal arm movement, with a hybrid magnesium-alloy/carbon-fiber arm tube and a vacuum-force lift that raises the arm automatically on power loss. The TDC01 series of moving-coil cartridges — TDC01, TDC01 Ti, and TDC01 Dia — gives TechDAS a matched analog front end built entirely in-house.
TechDAS’s original statement product, debuting at CES in January 2013 around $97,000–$105,000. It introduced the modern Air Force formula — air-bearing platter, vacuum hold-down, twin crystal-locked power supplies — and held Stereophile’s Class A+ rating for six consecutive years.
The cost-no-object flagship, unveiled at a launch event in Tokyo on March 16, 2019. The main unit weighs 330 kg, with a five-layer, 100 kg platter stack (33 kg/20 kg/20 kg/20 kg forged stainless steel and gunmetal layers, plus a titanium or optional tungsten top layer), driven by a 3-phase 12-pole Papst AC synchronous motor and supporting two tonearms. Priced from $450,000, excluding tonearm and cartridge.
TechDAS’s entry-level turntable, reviewed by Michael Fremer in Stereophile’s September 2019 issue at $19,500 without tonearm. It retains the air-bearing platter and vacuum hold-down of the flagship models while omitting the air-bladder chassis suspension of the higher tiers, and landed in Class B of Stereophile’s Recommended Components.
First previewed at Munich High End and released in April 2026 at £19,998 in the UK, the Air Force IV is priced around $19,600 through North American dealers; it slots directly above the Air Force V Premium as a compact mid-tier model, retaining the air-bearing and vacuum hold-down core technologies.
TechDAS’s own air-bearing tonearm, in 10-inch and 12-inch lengths. Horizontal motion rides on the TechDAS Air Bearing Float System; vertical motion uses a tungsten pivot and ceramic ball bearing, with a hybrid magnesium-alloy/CFRP arm tube and DLC coating.
Three moving-coil cartridges — TDC01, TDC01 Ti, and TDC01 Dia — built in-house as the matched partner to the Air Force turntables and Air Force 10 tonearm.
The TechDAS lineup, entry to flagship: Air Force V Premium, Air Force IV, Air Force III Premium, Air Force III Premium S, Air Force One, Air Force One Premium, and Air Force Zero, plus the Air Force 10 tonearm and TDC01 cartridge series. All turntables use air-bearing platters and vacuum record hold-down; higher tiers add air-bladder chassis suspension.
The Audio Salon, based in Santa Monica, California, became TechDAS’s exclusive US distributor in October 2022, taking over from Graham Engineering. TechDAS and The Audio Salon worked directly with Bob Graham to transition existing US customers. US buyers seeking warranty registration, authorized-dealer information, or service should contact The Audio Salon directly; outside the US, contact the regional distributor listed on techdas.jp.
Air Force turntables are low-volume, high-value systems with real mechanical complexity — air pumps, precision-machined platters, custom motor-drive electronics — so most service routes back through the distributor or the factory rather than a local generalist repair shop. The air pump and power supply are the components most likely to need periodic attention; the platter and bearing assemblies are durable by design.
TechDAS turntables reach the used market rarely — ownership is small, the products are heavy and expensive to move, and first owners tend to hold on to them. When one does surface, the framework is different from a higher-volume brand: less about generational depreciation, more about verifying provenance and distributor support.
Ask the seller for the serial number and contact The Audio Salon (US) or the relevant regional distributor to confirm the unit is authentic, whether it has been through factory service, and whether anything is documented against it. This costs nothing and takes a few minutes.
Air Force turntables are systems, not single boxes — the Air Force Zero ships with three separate power/air units. A missing accessory is expensive to replace and can leave the turntable unusable until it’s sourced. Ask for a working demonstration with all supplied units before buying, or arrange a professional inspection.
The air compressors driving the bearing and hold-down systems are mechanical, with finite service life, though they are factory-serviceable. On an older used Air Force, budget for a possible pump service if the seller can’t document recent maintenance.
An Air Force One weighs on the order of 100 kg with accessories; the Air Force Zero exceeds 500 kg for the complete system. Custom crating, insured freight, and professional setup are meaningful line items on top of the purchase price — factor them into any used-market budget, especially on the larger models.
The Air Force V (new at $19,500) and the newer Air Force IV (new at roughly $27,000) are the models most likely to turn up on the used market at prices a serious analog buyer can actually consider, while retaining the air-bearing and vacuum-hold-down core of the brand.
The used TechDAS market is thin by design — small production volume, high shipping friction, and strong first-owner attachment. That means used-market pricing data is sparser and less reliable here than for higher-volume brands; treat any specific comp as anecdotal rather than a trend line until HFR accumulates enough real transaction data on this brand to say more.
Nishikawa earned a mechanical engineering degree in 1963 and joined Stax the following year, working on electrostatic headphone engineering. He left Stax in 1973 to found an OEM design and manufacturing company with former colleagues. In 1980 he joined Micro Seiki as manager of the technical department (later Sound Business Director), where he designed the SX-8000 reference turntable. In 1989 he co-founded Stellavox Japan — later renamed Stella Inc. — as a high-end audio distributor, and in 2010 he founded TechDAS as Stella’s in-house turntable brand. See TechDAS’s own founder biography for the full account.
Not corporate — Micro Seiki is a separate, no-longer-operating company, with no legal or ownership tie to Stella or TechDAS. The connection is Nishikawa himself: he was Micro Seiki’s designer for the SX-8000 in the 1980s, and TechDAS’s Air Force series applies the same air-bearing and vacuum-hold-down principles he developed there.
Vacuum hold-down clamps the record to the platter with suction instead of a weight or clamp — the same principle a record-cutting lathe uses to hold the lacquer master flat while it’s cut. Per TechDAS, the vacuum does more than flatten warped records — it also damps vibration by coupling the record mechanically to the platter’s mass.
From entry to flagship: Air Force V Premium, Air Force IV, Air Force III Premium, Air Force III Premium S, Air Force One, Air Force One Premium, and Air Force Zero. TechDAS also makes the Air Force 10 tonearm and the TDC01 series of moving-coil cartridges.
The Audio Salon, based in Santa Monica, California, became TechDAS’s exclusive US distributor in October 2022, taking over from Graham Engineering. US buyers seeking authorized dealers, warranty, or service should contact The Audio Salon directly.
TechDAS’s dealer network is small and distributor-managed. In the US, authorization runs through The Audio Salon in Santa Monica, California; outside the US, see TechDAS’s regional distributor list.
No authorized TechDAS dealers are listed on HFR yet. Check back as HFR’s dealer network grows.
A curated bibliography of the sources cited throughout this Buyer’s Guide chapter. All specialist reviews and manufacturer materials referenced in the sections above are indexed here.