Atma-Sphere MA-1 Mk. 3.3
$19,600.00
Full Disclosure: As found on AI Search
OTL (Output Transformer-Less) amplifiers are considered dangerous primarily due to risks to your loudspeakers if a failure occurrs the loudspeakers will be damaged. Also potential for severe electrical shock, as they lack the protective output transformer, allowing catastrophic failures (like high DC voltage) to directly fry speakers or electrocute users if internal wiring or mains polarity is faulty.
0% – 3 Year Financing Available!!
Demo Available
Atma-Sphere MA-1 Mk. 3.3 Amplifier
Description
Full Disclosure: As found on AI Search
OTL (Output Transformer-Less) amplifiers are considered dangerous primarily due to risks to your loudspeakers if a failure occurrs the loudspeakers will be damaged. Also potential for severe electrical shock, as they lack the protective output transformer, allowing catastrophic failures (like high DC voltage) to directly fry speakers or electrocute users if internal wiring or mains polarity is faulty.
0% – 3 Year Financing Available!!
Demo Available
Atma-Sphere MA-1 Mk. 3.3 Amplifier
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.
- Balanced Differential Design®
- Class-A operation
- Patented Circlotronic® direct-coupled (OTL) output stage
- Automatic biasing system
- V-Cap copper foil Teflon coupling capacitors
- 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
- 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 with one year warranty on output tubes
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
( per channel ) 14 x 6AS7G output tube
5 x 6SN7 driver tube
Gain
25 dB ( for 8 Ω )
Power Bandwidth
2 Hz-200 KHz within ½ dB
Frequency response
( 1 watt, open loop ) 20 Hz squarewave Tilt; unmeasureable
1Hz-300KHz within 3 dB
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
( per channel ) 500 watts
Power Supply storage
( per channel ) 600 Joules
Dimensions
( per chassis ) 18″ deep x 17″ wide x 8.5″ tall ( 46 x 43 x 22 cm )
Weight
( per chassis, without tubes ) 36 lbs. ( 16.3 kg )
Warranty
Three year general coverage
One year for output tubes
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