Air Tight's Reference line

ATM 3211 - Reference mono power amplifier

Airtight's dream came true in 2017 with their 120W output from exquisite 211 Triode push-pull circuitry.

The circuit configuration is as follow:
- 1st stage: differential circuit of 12AX7
- 2nd stage: 12BH7
- Cathode-follower 12BH7 parallel
- A-class operation up to 30W
- AB-class operation for more than 30W
- Wide frequency range is obtained by NFB circuit (Frequency response 10Hz～50ｋHz　±１ｄB)
- Massive Tamura’s output transformer is employed
- High and low 2-compositions transformer ensure instantaneous power supply and prevent power interference.
- High grade capacitors and resistors are employed in key locations.
- The 15mm thick aluminum front panel is carved by hand.
- WBT input and speaker terminals are employed.
- Wiring and soldering are all done by hand.

Specifications:

Valves employed: 12AX7 x 1, 12BH7 x 3, 211 x 2
Rated output: 120W (6Ω/THD2%)
Frequency response: 10Hz~50kHz (±1dB/THD0.06%)(at 1kHZ/30W)
Damping factor: 6(1kHz/1W)
Input sensitivity: 1V/Input impedance 100kΩ
Power consumption: 550VA
Load impedance: 6Ω/16Ω(Interchangeable, 6Ωstandard)
Dimensions: 400(W) x 450(D) x 405(H) mm
Weight: 44kgs

Downloads

Airtight's PDF specification

ATM-2001/ATM-2001S

Superdreadnought mono power amplifier / stereo power amplifier

Features

- Comfortable high power thanks to colossal output stage featuring 12 pieces 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

Specifications

Valves employed: 6550 × 12, 12BH7× 6, 12AX7× 2, 12AU7 × 2
Rated output: 338W(8 ohms, mono) / 180W(8 ohms,stereo)
THD: less than 1% at rated output
Frequency response: 20 - 20,000Hz( 1dB)
Input impedance: 100k ohms
S/N ratio: 100dB
Dimensions:
power supply: 430(W) ×185(H) ×500(D)mm
amplifier: 430(W) ×380(H) ×520(D)mm
Weight:
power supply: 65kgs
amplifier: 50kgs

Air Tight's Single-Ended Triode Power Amplifiers

NEW ATM-2211 - monaural power amplifier

About 20 years have passed since the launch of the ATM-211 single-monaural power amplifier using 211 tube, which has been well received since its launch in 2001. Since then, AIR TIGHT launched 211 push-pull monaural power amplifier ATM-3211, which has become a turning point for the Airtight brand as well as SET ATM-300R. For their 35 year anniversary, AIR TIGHT will launch the new 211 single monaural power amplifier ATM-2211.

Specifications/Features:

Valves employed: 1/12AX7, 1/12BH7, 1/211
Rated output: 32W(THD<5%)
Input impedance: 100kΩ(RCA/XLR)
Input: RCAx1, XLRx1(No.2 pin=HOT)
Input sensitivity: 500mV(32W)
Frequency response: 20Hz~20kHz(-1dB) @3.5W
Power consumption: 250VA
Dimensions: 400(W)x350(D)x225(H)mm
Weight: 25.5Kg

Downloads

Airtight's PDF specification

Air Tight Power Amplification

ATM-3

monaural power amplifier

Features

- 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

Specifications

Valves employed: 6CA7 × 6, 12AX7 × 1, 12AU7 × 1
Rated output: 110W (UL), 55W(triode)
Input impedance: 100kohms
Features: UL/triode mode selector, bias adjuster
Dimensions: 405(W) × 340(D) × 220(H)mm
Weight: 25kgs

ATM-300R

stereo power amplifier
ATM-300R was developed as a reference model to show off the &lquo;Warm and Soft&rquo; sound of conventional 300B amplifiers and applaused enthusiastically, the ATM-300 was supported by many audiophiles in the world. In order to reflect the individuality of a wide variety of 300B , AIRTIGHT built a sound stage full of musicality that allows the sphere to fully demonstrate its potential while suppressing the colouring of the sound as much as possible. As a result, while making full use of the individuality of the sphere, they have realized the freshness that the music permeates, the vast and deep sound field, and the dynamics that makes one forget the specifications of a 9W output.

Specifications

Power Output : 9W＋9W (THD<10%) THD below : 1% (1kHz / 1W / 8Ω) Input Sensitivity : 290mV (9W) Damping Factor : 7 (1kHz / 1W / 8Ω) Frequency Response : 30Hz～40kHz (−1dB / 1W) Dimensions : 430(W)×275(D)×245(H)mm Weight : 24.5kg

Downloads

Airtight's PDF specification

ATM-1S stereo power amplifier

ULTIMATE DESIGN FOR SONIC IMMACULACY
- 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

Specifications

Valves employed: 6CA7 × 4, 12AU7 × 2, 12AX7 × 1
Rated output: 36W + 36W (8 ohms)
Input sensitivity: 1V
Input impedance: 100kohms
Load Impedance: ４Ω/８Ω/16Ω　Interchangeable by inner wiring.
Set at 8Ωload when shipped from the factory.

Features

Input selector (2-ch), bias adjuster
Dimensions: 368(W) × 293(D) × 231(H)mm
Weight: 22kgs

Downloads

Airtight's PDF specification

Air Tight Pre Amplifiers

ATC-5

stereo line & phono control amplifier

Specifications

Valves employed: 12AX7 × 3, 12AT7 × 2
Phono equalizer input: RCA/MM × 2
Input impedance: 47kΩ（Gain 40dB）
Phono equalizer output: RCA × 1
Output impedance: Recommended load more than 47kΩ
Line input: RCA × 3
Input impedance: 47kΩ (Gain 18dB)
Line output: RCA × 2
Output impedance: Recommended load more than 47kΩ
Output voltage: 20V(Load 100kΩ/1% distortion)
Line amplifier distortion: THD 0.02%(1V/1kHz)
Frequency response Phono equalizer: 50Hz~20kHz(±0.2dB) /20Hz-2.5dB
Frequency response Line amplifier: 20Hz~100kHz-1dB
Power consumption: 50VA
Dimensions: 400(W) × 260(D) × 90(H)(tentative)
Weight: 9kgs(tentative)

ATC-3

stereo line-control amplifier

Features

- 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

Specifications

Valves employed: 12AX7(ECC83) × 1, 12AU7(ECC82) × 2
Output voltage: rated 2V, max. 15V
Output impedance: 200 ohms
THD: less than 0.01%
Input sensitivity: 110mV (ouput 1V)
S/N ratio: less than 90dB (IHF-A weighted)
Dimensions: 430(W) × 325(D) × 90(H)mm
Weight: 8kgs

Air Tight Phono Equalizer

ATE-3011

BUILD TO ORDER - reference phonostage

ATE-3011 is Airtight's latest phonostage, born for music lovers who thoroughly enjoys the profound world of record reproduction. The ATE-3011 is equipped with 5 equalizing curves (RIAA, NAB, AES, FFRR, & FLAT) for Turnover and Roll-Off, and can independently select turnover and roll-off to create various curves to optimize for your vinyl collections.

Large-size self-illuminating display and equalize curve selector switch offers easy change over between the equalizing curves which often requires intricate settings on other equalizer, and now music lovers can focus on appreciation of recorded music.

Features

- 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

Specifications

Valves employed: 12AX7 x 3
Phono equalizer input: RCA/MM × 3
Input impedance: 47kΩ（Gain 40dB）
Phono equalizer output: RCA × 2 + 1(mono only)
Output impedance: Recommended load more than 47kΩ
THD: 0.02%(1V/1kHz)
Frequency response: 50Hz~20kHz(±0.2dB) /20Hz-2.5dB
Power consumption: 50VA
Dimensions: 400(W) × 375(D) × 151(H)mm
Weight: 12.2kg

Downloads

Airtight's PDF specification

Step-Up Transformers

ATH-3

Step-up transformer for MC cartridge

Specifications

Step-up ratio: 1:40 (32dB gain) at low impedance mode
Adaptable impedance of cartridges: 1Ω〜7Ω (Recommended)
> > >The adaptable impedance range can be converted to 7Ω〜40Ω.

Dimensions: 144 (W) × 207 (D) × 80 (H) mm
Weight: 1.5kgs

ATH-2 REFERENCE

Step-up transformer for MC cartridge

The ATH-2 REFERENCE is Air Tights 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 have been remarkably improved, thus achieving an unparalleled musicality of your analogue discs.

Features

- frequency rage being fully procured, the upper-end is extend up to 80kHz (-1dB) and 120kHz (-2.2dB).
- 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
- 2 Ohm position 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

Specifications

Input Selector - ３ position
・Bypass: without gain, for MM cartridges
・2Ω　(0.6Ω～7Ωapplicable)　gain 29ｄB　
・40Ω　(7Ω～40Ω applicable)　gain 23ｄB
Frequency response: 10Hz～80ｋHz　(-1dB)
Dimensions: 240(W)×180(D)×70(H)mm
Weight: 2.8kgs

Reviews

RK-501

High-precision volume

Features

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. Available at option for the ATC-1, ATC-2, ATC3

Images from Angie's Trip to Air Tight