Atma-Sphere Atma-Sphere MA-1
The best tube amplifier worldwide, 2 x 140 watts OTL monoblocs, Mk 3.3
Recipient of The Absolute Sound's prestigious "Golden Ear Award" in 2000, the MA-1 enjoys an enviable reputation. Now the Mk. 3.3 series builds on proven technology. An improved output section and enhanced driver circuit contribute to superior low-level detail, smoother sound, wider bandwidth and AC power immunity. The rugged, non-magnetic chassis features classic looks with superior layout. Setup of the amplifier is simple with it's automatic biasing system. The controls and switches are ergonomic without sacrificing performance.
The MA-1 is extraordinary in every way. Not only is normal operation easy on the vacuum tubes, the effect of a tube failure on the unit is entirely inconsequential. Despite its extreme performance, the MA-1 is known for remarkable ease of setup, ease of operation, day-to-day consistency and of course extreme musicality.
Featuring our new custom wire, V-Cap Teflon coupling caps, custom resistors, and all the other extras for which we are known, the MA-1 shines as an example of why our amplifiers are the best amplifiers worldwide, regardless of cost.
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- Easily monostrapped for greatly increased power- 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- Exclusively uses Octal-Triode based vacuum tubes- Classic open chassis construction with Wrinkletex™ finish- Three-year general coverage warranty, - One year warranty on output tubes
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Specifications
- Output power
- 140 watts per channel into 8 Ω load 135 watts per channel into 4 Ω load
- Impedance
- Input Impedance: 100 KΩ single-ended, 200 KΩ balanced Output Impedance: ~2.3 Ω (power method standard measurement)
- Input
- 2.8 V sensitivity RCA and XLR true balanced input
- Tube complement
- 14 x 6AS7G output tube ( per channel ) 5 x 6SN7 driver tube ( per channel )
- Gain
- 25dB (for 8 Ω)
- Power Bandwidth
- 2Hz-200 KHz within ¾ dB
- Frequency response
- 20 Hz squarewave Tilt, unmeasureable 1Hz-300KHz within 3 dB
- Power supply storage
- 600 Joules ( per channel )
- Distortion
- Total Harmonic Distortion (THD) typically 0.5% at full power. Intermodulation (IM) distortion typically under .005% at full power. Phase shift less than 1° @ 20KHz
- Output section risetime
- 600 V/µs
- Power consumption
- 500 watts ( per channel )
- Dimensions
- 18" deep x 17" wide x 8.5" tall ( 46 x 43 x 22 cm) per chassis
- Weight
- 36 lbs. ( 16.3 kg ), per chassis, without tubes
- Warranty
- Three year general coverage One year for output tubes
Manufacturer's Description — Atma-Sphere
The best tube amplifier worldwide, 2 x 140 watts OTL monoblocs, Mk 3.3
Recipient of The Absolute Sound's prestigious "Golden Ear Award" in 2000, the MA-1 enjoys an enviable reputation. Now the Mk. 3.3 series builds on proven technology. An improved output section and enhanced driver circuit contribute to superior low-level detail, smoother sound, wider bandwidth and AC power immunity. The rugged, non-magnetic chassis features classic looks with superior layout. Setup of the amplifier is simple with it's automatic biasing system. The controls and switches are ergonomic without sacrificing performance.
The MA-1 is extraordinary in every way. Not only is normal operation easy on the vacuum tubes, the effect of a tube failure on the unit is entirely inconsequential. Despite its extreme performance, the MA-1 is known for remarkable ease of setup, ease of operation, day-to-day consistency and of course extreme musicality.
Featuring our new custom wire, V-Cap Teflon coupling caps, custom resistors, and all the other extras for which we are known, the MA-1 shines as an example of why our amplifiers are the best amplifiers worldwide, regardless of cost.
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- Easily monostrapped for greatly increased power- 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- Exclusively uses Octal-Triode based vacuum tubes- Classic open chassis construction with Wrinkletex™ finish- Three-year general coverage warranty, - One year warranty on output tubes
Verified Dealers
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Authorized dealers for Atma-Sphere Atma-Sphere MA-1
- 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