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Air Tight

Belonging to the Sport Club (table-tennis) during 1952 - 1956 in his university days, Mr. Miura joined Lux Corp. (LUXMAN) upon his graduation by invitation of Mr. H. Hayakawa his 3-year elder club manager (who became the president later). Lux Corp. founded in June 1924 by Mr. T. Hayakawa & his brother K. Yoshikawa was the oldest manufacturer in Japan of the electronic components, and already famous at that time for the output transformers & switches. In those days with spread of radio, some of the parts manufacturers such as Pioneer, Sansui and Trio have already started to make Hi-Fi amps.
Though being a 'radio' boy by nature, he has not got an education as an engineer and in the beginning at Lux Corp. he was mainly in charge of purchase and control of component materials, and later took part in building a factory for manufacture of audio amps.
In 1961 he married Mari the eldest daughter of Mr. Yoshikawa, the counterpart of the founders in charge of technical field and the then president, and begot a son and a daughter, thus becoming a member of the 'LUXMAN' family.
As from 1968 he started to lead the Sales Division as the general manager in Tokyo Office for sales promotion in the domestic and overseas markets. In this period he brought up the LUXMAN to be the top-notch brand in Hi-Fi audio, introducing many hit models such as SQ-38, SQ-505, MQ-60, CL-35, etc. to name a few. During 1977 -1980 he was stationed in New York in the capacity of the president of the US affiliate, Lux Audio of America. At that time, so-called Hi-End Audio manufacturers such as Mark Levinson appeared in the marketplace, which exerted a great influence on his later creation of the Air-Tight brand.Having retired from Lux Corp. in 1985, he formed A & M Ltd. with Mr. M. Ishiguro and started design for his 1st model ATM-1 amp. In those days, all the manufacturers are absolutely for solid-state gears and even Lux Corp. renowned for tube amps was inclined to stop the production. It being a sheer waste to leave on the shelf such outstanding amplifying components as tubes, he began to think to make what he wants if all shift to transistors & semi-conductors, motivated by the existence of such audio precursors as M/S. S. Marantz and M. Levinson he met in his US days.

Since his big senior Mr. H. Hayakawa left LUXMAN Co., Mr. Miura is the only person engaged in this industry. To requite the favours given by Mr. Hayakawa & Mr. Yoshikawa his father-in-law, he is striving to do something contributing to development of the cultural world of audio.

Incidentally, the A & M company was named after 3 acronyms: 1st, the initials of Atsushi Miura himself, 2ndly, Atsushi & his wife Mari, 3rdly, Atsushi & Masami (Ishiguro) his engineering partner

 
 
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For The True
Audio

Connoisseur
Reference Amplifiers
ATM-2001/2001S
  • Comfortable high power thanks to colossal output stage featuring 12 pcs. of 6550 beam valve
  • Individually direct-coupled cathode-follower to ensure an optimum operation of each output valve
  • Massive power supply employing huge EI power transformer
  • 2 independent amps thus composed in UL configuration afford rich high power without load on each component
  • Lavish employment of strictly select components of high performance & long durability
am-ATM-20012C2001S-2.jpg
 
ATE-2001
  • EQ circuitry configured by 2 NF stages & low-impedance, SRPP output stage assures stable function of NF to achieve low distortion
  • Select on-deck step-up transformer to derive the full potentials of MC cartridges
  • Low-impedance output created by non-NFb SRPP circuit enables to drive any of power amps
  • Abundant inputs, 3 lines & 4 phonos (3 MC + 1 MM) for versatile use. MC impedance selectable between 3Ω & 20Ω
  • Low-noise power supply featuring an optimum combination of valve & semi-conductor in pursuit of utter operational stability & noise banishment
  • Constant voltage an independent regulator supplies to each valve ensures thorough elimination of mutual interferences
 
ATM-3011R - reference mono power amplifier
  • ASTOUNDING RESERVE IN POWER QUALITY!
  • The memorial valve high-power mono amp to mark the glorious 25th anniversary of the Air Tight ,that enables to derive in the form of ultimate fidelity the high-speed feelings , definition capability and opulent information inherent in the latest speakers.
  • Parallel Connection of KT120 Valves under UL connection operated are 12pcs. of the reputed high-power valve compatible to the KT88.
  • Driving Circuitry Featuring Direct-Coupled Cathode Follower
  • Output valves can be easily adjusted by the front bias meter and the alignment pot affixed to each valve
  • Banishment of PCB
  • The amp section, all the components are placed on the copper-plated steel plate in order to improve heat conduction, to prevent vibration and shield magnetism
  • Strictly Select Components
  • Dispositions of components are so designed as to effect heat dissipation by natural air circulation, thus ensuring noise suppression to achieve good S/N ratio
  • Chassis of compact, upright structure
 
Single-Ended Triode Power Amplifiers
ATM-300
  • Legendary musical charms of jubilee-long reputed, genuine 300B diect-heated valve
  • Self-biased Class-A operation at 300B output stage
  • 3-stage triode amplification for sublimate musicality
  • DC-driven heater to reduce noise inherent in direct-heated valve
  • Bias/current meter to check optimum operation of output valve
  • Damping selector control to create one’s favourite sound
  • Lavish employment of second-to-none, custom-selected components
  • Copper-plated chassis to remove magnetic distortion
  • Attenuator on direct-CD input
 
ATM-211
  • Unprecedented high power 22W derived from broadcast-oriented 211 valve with direct-coupled cathode-follower stage
  • All-stage triode-driven non-NF Class-A operation to achieve pure,unimpaired sound
  • Independently coiled transformer for amp-stage, bias, heater & relay circuits to remove mutual interferences
  • DC-driven heater filament to eliminate hum of output valve
  • Relay-activated muting circuit for long life of electrolytic capacitor
  • Bias meter to check operation status of output valve
 
Power Amplifiers
ATM-4
  • Reputed 6L6GC beam-valve boasting of long history starting from military application
  • UL connection enabling to offer affluent power and guts
  • Low NF design for low distortion
  • Adjuster pot & centre meter to assure optimum balance of push-pull operation
  • Stereo/mono selector switch
  • Select components for long-time listening pleasure
 
ATM-3
  • 6CA7 output valves for high reliability and affluent musicality under triple push-pull configuration
  • Selector between UL and TRIODE modes enabling to match the amp operation to type of speaker used, or the sound to your personal taste
  • Bias adjustment enabling each and all valves to exhibit the same operational performance
  • Removal of PCB’s for vivid, natural sonic reproduction
  • Large power transformer with heavy-duty choke coil and reputed Tamura output transformer
  • Muting delay system to protect output valves
 
ATM-2
  • Renowned KT-88 output valves for high power
  • Bias adjuster for optimal operation of output valves
  • Cathode follower direct drive circuitry under UL connection
  • Total hand-wiring without PCB’s
  • Full OFC wiring with copper-plated chassis and bottom plate
  • Dependable Tamura output transformers with large input capacity exceeding 100W
  • CD direct input enabling unimpaired digital reproduction
 
ATM-1S
  • Dependable orthodox configuration composed of highly acclaimed 6CA7 valves under Mullard phase inversion
  • Hefty output headroom achieved by newly developed Hashimoto transformers boasting of 60W power handling capability
  • Bias adjustment facilities for easy service accessibility
  • No PCB in favour of point-to-point manual soldering with full OFC wires and copper-plated chassis
 
Pre Amplifiers
ATE-2
  • Genuine valve configuration for whole amp stages even at power supply
  • Latest sonic-oriented high-quality attenuator for matchless sonic transparency and silky smoothness
  • EQ circuitry composed of 2-stage NF & SRPP to insure wide-band spectrum and minimum distortion
  • Elaborate power supply for high stability and low noise
  • Direct-accessible EQ output bypassing volume pot
  • High-mass, vibration-proof chassis for high rigidity
 
ATE-2005
  • Onboard headamp for low-output MC cartridge
  • Low-noise, high-stability equaliser stage featuring select ECC83 valves
  • Independent 4 circuit sections to prevent mutual interferences for low-noise operation
  • Degauss function to remove magnetism of cartridge
  • Multiple 1 MC & 2 MM inputs
  • Exquisite manual wirings on signal paths
 
ATC-2
  • Self-biased 2-stage NF flat amp to provide impressive high gain, thus insuring powerfulness and high resolution
  • SRPP output stage for high power under low impedance
  • 6 independent constant voltage circuits for stable, low-bass reproduction
  • Custom-selected coupling capacitor to ensure natural sound free from intermodulation distortion
  • Abundant input and outputs for versatile use
  • Single-steel chassis coated with several enamel layers for superb rigidity expelling mechanical noise and induced currents
  • “Alps” acclaimed high-precision pot RK-501 available at option
 
ATC-3
  • SRPP line amp with reinforced buffer stage to assure good noise rejection, low output impedance and extended linearity
  • Rich power supply featuring quick recovery diode for high operational speed and low pulse noise
  • Single-steel sheet with multi-layer enamel for high rigidity and low noise
  • High-quality input/output jacks with detachable mains cord
  • Optional ‘Alps’ high-precision pot RK-501
 
ATC-1
  • Highly reliable 12AX7 valves meticulously selected after ageing
  • 3-stage low-impedance K-K NF configuration equaliser acclaimed for low distortion & wide frequency response
  • Simple, single-stage flat amp for pure sound
  • High-voltage B-power supply with quick recovery diode
  • PCB-free hand wiring
  • Discrete, highly rigid dia-magnetic chassis
  • EL-core power transformer
 
Others
ATH-2 REFERENCE
  • We, A&M Ltd., proudly introduce the ATH-2 REFERENCE as one of the finest As an ultimate top version of the ATH-2A, the ATH-2 REFERENCE has three selectable inputs, i.e., "Bypass", "2Ohm" and "40Ohhm".
  • Thanks to the employment of the new winding material (oxygen-free copper) and careful review on its winding method, the dynamics-range, sonic powerfulness and quality feelings have been remarkably improved, thus achieving an unparalleled affluence in terms of musicality of analogue discs.
  • The frequency rage being fully procured, the upper-end is extend up to 80kHz (-1dB) and 120kHz (-2.2dB).
  • The S/N ratio especially at the low output level totally surpassing the competitors' performance, you may enjoy the higher quality in the different dimension in combination with the Hi-End amplifiers.
  • To say nothing of the 2 Ohm position that complies with the latest ultra-low impedance below 1 Ohm, the ATH-2 REFERENCE derives the full potentials of the existing MC cartridges, starting from the Ortofon SPU down to the latest ones
 
ATH-2A
  • Input selector for 3 different cartridges/tonearms
  • Input impedance selectable among 3 positions [2 ohms, 40 ohms & bypass (for MM cartridge)]
 
ATE-1
  • Valves employed:
    12AX7 × 3
    Dimensions:
    320(W) × 225(D) × 60(H)mm
    Weight:
    1.5kgs
 
Option
RK-501
  • RK-501available at option for the ATC-1,ATC-2,ATC3
  • A unique polished solid brass enclosure resistant to vibration and resonance with a newly developed carbon resistor offers unsurpassed sonic transparency and silky-smooth touch to level control
 
Cartridges
PC-1 Supreme
  • Epoch-making Hi-µ core material SH-µX recently developed offers high µ amount to realise high-efficiency magnetic circuitry
  • Thick wires help reduce winding Nos. in coil, thus achieving astounding low internal impedance
  • Expanded bandwidth & extended dynamic range present clearer life-like soundstage, whilst improvement in transient & phase characteristics reproduces ultra-heavy bass with highest resolutions
 
PC-1
  • New, exclusive SH-µX core material made compatible the mutually contradictory factors, high energy & low impedance
  • Hi-efficiency magnet system allows very few coil windings for low impedance
  • Impeccable tonal balance offering generous, opulent bass, supple midband & extended, resolved top end
 
PC-3
  • Top-notched sonic quality with wide range frequency spectrum under an outstanding S/N ratio
  • Multi-structure cantilever composed of baron & aluminium for optimum signal transmission
  • Semi-line contact diamond tip ensuring accurate trackability
 
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