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
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
For all support requests, or any questions about your Atma-Sphere product, contact us directly at (651) 690-2246 or send us an
email.
Optional Features
Power Supply Boost
uses custom built filter caps for MA-2
Caddock® resistor package
Meter Panel finish options
Gray hammertone
Brushed anodized black
Brushed anodized silver
Brushed anodized gold
Custom finishes available upon request
Accessories
Jumper plugs for high efficiency speakers
Replaces tube in the voltage amplifier section of Atma-Sphere
power amplifiers, thus reducing gain for high efficiency speakers.
Recommended when efficiency of speaker is over 100.
Cables
Balanced Interconnect
Balanced phono cable
1 meter, DIN to XLR or RCA with ground post to XLR
Pricing
Contact your local
dealer for pricing information.
Or, call (651) 690-2246 or
email us with any questions.
