"Even supermodel Claudia Schiffer's smile at the Soho Grand, moments after I interviewed Massive Attack, paled in comparison to the thrill of unboxing the ATM-1E. Its EL34 tubes and trademark gray finish filled me with awe and desire."
- Ken Micallef, stereophile.com | Read Review
AIRTIGHT ATM-1E STEREO AMPLIFIER
The Evolution of the EL34 Pentode Vacuum Tube
Starting with the classic triode as an amplification device, vacuum tubes evolved through tetrodes and beam tubes before arriving at the pentode tube, the EL34. This pentode is a hallmark not only in audio applications but also in guitar amplifiers. Thanks to its ease of use and high power output, the EL34 was mass-produced during the golden age of vacuum tubes. Since its release in 1955, it has been widely adopted, making its sound familiar to not only audiophiles but also general music lovers.
However, despite its widespread use, EL34 power amplifiers seem to have been undervalued in recent years in the audio world. Manufacturers have turned their attention to vacuum tubes that were previously unused in audio amplifiers, leading to a trend where only highly distinctive amps gain recognition.
Is the EL34 Amp Outdated?
Not at all. The EL34 delivers a pure, well-defined sound that rekindles the joy of simply enjoying music. Its neutral character, which does not favor a particular listener or genre, aligns perfectly with the diverse musical tastes of modern music enthusiasts.
A&M, in 1986, released its first model, the EL34 push-pull power amplifier "ATM-1", under its Air Tight brand. At a time when vacuum tubes were being forgotten, Air Tight deliberately chose to showcase an EL34 amplifier—a staple of the vacuum tube era. The company's vision was clear: to reaffirm the true appeal of vacuum tube amplifiers, demonstrating that they are neither outdated nor just antique collectibles. The ATM-1 was a carefully crafted, high-value EL34 push-pull amplifier, built with precision and sincerity.
The EL34 Revival: "ATM-1 2024 Edition"
Fast forward to 2024—both the audio landscape and listening styles have changed dramatically. To meet today's demands, Air Tight has reconstructed the ATM-1, leading to the ATM-1 2024 Edition—a modernized EL34 amplifier that stays true to its roots.
This is the first major update in 18 years since the ATM-1s in 2006. The 2024 edition preserves the original's musical integrity and sophisticated design while refining its balance and incorporating the finest available components to maximize EL34’s performance.
Authentic EL34 Engineering
The circuit design follows the traditional Leak-Mullard style.
Uses UL (Ultra-Linear) connection for a stable 35W + 35W output with a quality-output balance.
Prioritizes authenticity and balance over novelty, fully utilizing EL34’s signature sound.
Features high-quality Tamura output transformers and choke coils.
Employs a fixed-bias circuit with an easy-to-read, specially designed vertical edgewise meter for effortless adjustments.
RCA input as standard, with an optional XLR (unbalanced, pin-2 HOT) input upon request.
Speaker load supports 4Ω / 8Ω, with an option for 16Ω modification.
All audio components are hand-selected through listening tests for optimal performance.
The pure copper sub-chassis is hand-wired, preserving Air Tight’s craftsmanship tradition.
The Air Tight Design Philosophy
The ATM-1 2024 Edition’s exterior respects the original ATM-1’s design while incorporating modern refinements:
Monocoque chassis for enhanced strength and acoustical integrity.
Seamless design with hidden screws for a clean look.
A thick aluminum front panel with precisely machined detailing.
A steel bottom plate with glossy copper plating for an elegant finish.
The compact, modern design of the EL34 amp retains Air Tight’s signature identity—a combination of sleekness, weight, and precision that continues to reflect the brand’s craftsmanship and heritage.
Enjoy the authentic sound of the newly reborn ATM-1 2024 Edition.
Specifications
Valves employed: 1/12AT7(ECC81), 2/6CG7 (6FQ7), 4/EL34
Rated output: 35W+35W (1kHz/THD<5%)
Frequency response: 20Hz~30kHz(-1dB/30W)
Input impedance: 100kΩ
Input sensitivity: 700mV(35W)
Damping factor: 6.7(1kHz/1W)
Power consumption: 250VA
Dimensions: 365mm(W) x 305mm(D) x 225mm (H)
Weight: 21.5kg
More information at airtight-anm.com