Airtight
Air Tight ATM-2211 Mono Amplifiers
Best monoblock amplifier for audiophiles seeking high-power vacuum tube performance.
The Air Tight ATM-2211 is a new single monaural power amplifier, building on the legacy of its predecessors. It features a high-power SET design with 32W output, utilizing the 211 tube. This amplifier emphasizes sound penetration and energy by applying significant Negative Feedback (NFB) from the plate of the 211 output tube to the first stage, rather than from the output transformer's secondary side. It incorporates a fixed bias method and DC ignition for the filament, with easily viewable bias meters. Independent power transformers for high-voltage and low-voltage, a custom hand-crafted choke coil, and a high-output Hashimoto Electric output transformer contribute to its dynamic sound.
$44975.00
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Owner Satisfaction
4.5
/ 5
Category Rank
1163
/ 1719
#1163 in Power Amplifiers
Price vs Category Average
+445%
Above average
Valves employed
112711271211
/ /AX, /BH, /
Who it's for
- Audiophiles seeking lifelike, emotionally resonant musical reproduction
- Collectors valuing meticulous Japanese engineering and artisanal build quality
- Investors looking for high-fidelity gear with strong resale potential
Who should skip it
- Budget-conscious listeners seeking more accessible high-end audio solutions
- Users preferring low-maintenance, solid-state amplification systems
- Owners of low-sensitivity speakers requiring high-power solid-state drive
Performance breakdown
Sonic Transparency
Direct plate-to-input feedback creates an exceptionally clear and energetic sound profile.
Build Integrity
Traditional monocoque chassis construction ensures superior resonance control and mechanical stability.
Low-Frequency Authority
Hashimoto transformers deliver deep, controlled bass that defies typical SET limitations.
Operational Maintenance
Integrated bias meters and fixed bias simplify essential tube maintenance for users.
Component Longevity
Built-in timer relays protect sensitive internal components during every power-on cycle.
Dynamic Range
Independent power transformers provide the headroom necessary for a wide, expansive soundstage.
Key Specs
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
Features
- SET x High Power design for enhanced sound penetration and energy.
- Fixed bias method and DC ignition for stable operation.
- Large vertical edgewise type Ip monitor and bias meter for easy viewing and adjustment.
- Independent power transformers for high-voltage and low-voltage circuits.
- Custom hand-crafted choke coil for a wide soundstage and dynamic low range.
- High output Hashimoto Electric output transformer for improved low-frequency response.
- Traditional monocoque chassis construction to control resonance and maintain mechanical strength.
- Built-in timer relay protects output tubes and smoothing capacitors upon power-on.
What customers say
Customers consistently praise the Air Tight ATM 2211 Mono Amplifiers for their exceptional build quality and sophisticated sonic performance. Owners frequently highlight the meticulous craftsmanship and robust construction, underscoring a product designed for longevity and aesthetic appeal. The amplifiers are celebrated for delivering a remarkably pure and engaging soundstage, often described as transparent and musically rich. This combination of superior design and unparalleled audio fidelity establishes them as a benchmark for discerning audiophiles seeking an elevated listening experience. The consensus points to a product that truly embodies high end audio excellence.
Know before you buy
By applying negative feedback directly from the plate of the 211 tube rather than the output transformer, the ATM-2211 achieves superior sound penetration and energy. This approach allows the amplifier to maintain the harmonic richness of a single-ended triode design while providing tighter control over the output.
The ATM-2211 features large, easy-to-read vertical edgewise meters on the front panel. These allow you to monitor the bias current in real-time, making it simple to perform adjustments and ensure the 211 tubes are operating within their optimal range.
The amplifier is flexible, offering both RCA and XLR inputs with a 100kΩ input impedance. Since it has an input sensitivity of 500mV for full output, it will pair well with most high-quality preamplifiers, though it is balanced to handle both single-ended and balanced sources.
The unit includes a built-in timer relay that manages the power-on sequence. This protects both the 211 output tubes and the smoothing capacitors from high-voltage surges, significantly extending the lifespan of your components.
The traditional monocoque design is used to maximize mechanical strength and rigidity. By effectively controlling unwanted chassis resonance, the construction ensures that the delicate signal path remains undisturbed, resulting in a cleaner and more stable sonic presentation.
Separating the power supplies for high-voltage and low-voltage circuits prevents electrical interference between stages. This isolation ensures that the amplifier delivers a dynamic, quiet background, allowing for better micro-detail and a wider soundstage.
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$44975