Atma-Sphere Atma Sphere MA-2
Powerful OTL amplifier, 2 x 220 watt monoblocks, Mk 3.3
Introduced in 1990, the MA-2 was the largest production triode amplifier and the largest production OTL in the world for nearly 12 years. In that time it set the bar for quality that has yet to be surpassed; it is one of the finest amplifiers made anywhere in the world regardless of price. Not only is it one of the most powerful production Output Transformerless amps available, it is also the most reliable. Audio purists have craved the design features of this amplifier since the beginning of Hi-Fi; only Atma-Sphere has succesfully put them all in the same place at the same time.
Now the Mk. 3.3 boasts an improved gain stage with even wider bandwidth and greater transparency than ever before. We have added switchable feedback and automatic tube biasing to round out the package. Yet it remains smooth, detailed, and tuneful with a speed that belies such a large tube amplifier. Unlike many other amplifiers, it will stand up to constant playback without any noticeable artifact. And the improvements the MA-2 offers will be obvious on any system within seconds of powering it up; it sounds that good.
The MA-2 is noted for its superior performance on Sound Lab, Wilson Audio, JM Labs, Magnaplanar and Avalon loudspeakers. These are speakers that need an amplifier capable of serious power. An amplifier that can fully utilise the full bass frequency range of the speaker with the proper control and impact, while simultaneously retaining detail, delicacy, and speed. This is an unusual combination but this is what sets Atma-Sphere apart from the competition.
FEATURES
- Balanced Differential Design®
- Class-A operation- Patented Circlotronic® direct-coupled (OTL) output stage- Dual-mono chassis construction- Automatic bias - no adjustment needed- Built in VU meter for tube and output monitoring- Copper foil V-Cap Teflon coupling caps
- Standby switch for long output tube life
- Dual AC power circuits for each chassis
- Uses only one gain stage for supreme clarity of sound
- Proprietary precision components used throughout
- Low-noise "star" grounding topology- Fully hand-wired point-to-point electronics - no circuit boards!- Stable with all input and load conditions- Uses octal-based triode tubes
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Specifications
- Output power
- 220 watts per channel into 4, 8 or 16 Ω load before clipping
- Impedance
- Input Impedance: 100 KΩ single-ended, 200 KΩ balanced - selectable to 600 Ω. Output Impedance: ~1.75 Ω (open loop)
- Input
- Selectable up to 600 Ω; 2.8 V sensitivity RCA and XLR true balanced input
- Tube complement
- 20 x 6AS7G output tube ( per channel ) 6 x 6SN7 driver tube ( per channel )
- Gain
- 26 dB (for 8 Ω)
- Power Bandwidth
- 2Hz-150KHz within 1/2 dB
- Frequency response
- ( 1 watt, open loop ) 20 Hz squarewave Tilt; unmeasureable, 1Hz-200KHz within 3 dB
- Power supply storage
- 1200 Joules in output section (per channel) 100 Joules in Driver supply (per channel)
- Distortion
- Total Harmonic Distortion ( THD ) typically 0.4% at full power. Intermodulation ( IM ) distortion typically under .04% at full power Phase shift less than 1 degree @ 20KHz
- Output section risetime
- 600 V/μs
- Feedback
- 2 dB
- Power Supply Current
- 80 Amps/channel
- Power consumption
- 800 watts ( per channel )
- Dimensions
- 28" deep x 17" wide x 10" tall ( 71 x 43 x 25 cm ) per chassis
- Weight
- 103 lbs ( 46.7 kg ), per chassis, without tubes
- Warranty
- Three year general coverage One year for output tubes
Manufacturer's Description — Atma-Sphere
Powerful OTL amplifier, 2 x 220 watt monoblocks, Mk 3.3
Introduced in 1990, the MA-2 was the largest production triode amplifier and the largest production OTL in the world for nearly 12 years. In that time it set the bar for quality that has yet to be surpassed; it is one of the finest amplifiers made anywhere in the world regardless of price. Not only is it one of the most powerful production Output Transformerless amps available, it is also the most reliable. Audio purists have craved the design features of this amplifier since the beginning of Hi-Fi; only Atma-Sphere has succesfully put them all in the same place at the same time.
Now the Mk. 3.3 boasts an improved gain stage with even wider bandwidth and greater transparency than ever before. We have added switchable feedback and automatic tube biasing to round out the package. Yet it remains smooth, detailed, and tuneful with a speed that belies such a large tube amplifier. Unlike many other amplifiers, it will stand up to constant playback without any noticeable artifact. And the improvements the MA-2 offers will be obvious on any system within seconds of powering it up; it sounds that good.
The MA-2 is noted for its superior performance on Sound Lab, Wilson Audio, JM Labs, Magnaplanar and Avalon loudspeakers. These are speakers that need an amplifier capable of serious power. An amplifier that can fully utilise the full bass frequency range of the speaker with the proper control and impact, while simultaneously retaining detail, delicacy, and speed. This is an unusual combination but this is what sets Atma-Sphere apart from the competition.
FEATURES
- Balanced Differential Design®
- Class-A operation- Patented Circlotronic® direct-coupled (OTL) output stage- Dual-mono chassis construction- Automatic bias - no adjustment needed- Built in VU meter for tube and output monitoring- Copper foil V-Cap Teflon coupling caps
- Standby switch for long output tube life
- Dual AC power circuits for each chassis
- Uses only one gain stage for supreme clarity of sound
- Proprietary precision components used throughout
- Low-noise "star" grounding topology- Fully hand-wired point-to-point electronics - no circuit boards!- Stable with all input and load conditions- Uses octal-based triode tubes
Verified Dealers
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Authorized dealers for Atma-Sphere Atma Sphere MA-2
- Afton Mountain Audio — in-store — Afton, Virginia, United States (website)
- Audio Perfection — online and in-store — Minneapolis, Minnesota, United States (website)
- Audio Revolutions — in-store — Khwaeng Thung Phaya Thai, Krung Thep Maha Nakhon (website)
- Phantom Audio — in-store — Jakarta, Jakarta, Indonesia (website)
- Salon One Audio — in-store — Ormond Beach, Florida, United States (website)
- Signature Sound — in-store — Liverpool, New York, United States (website)
- Sounds Of Silence — in-store — Nashua, New Hampshire, United States (website)
- Sun Mountain AV — in-store — Colorado Springs, Colorado, United States (website)
- Triode Picture + Sound — in-store — New York, New York, United States (website)
- USA Tube Audio — online and in-store — Phoenix, Arizona, United States (website)
and 1 more verified dealer