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Atma-Sphere M-60 Mk. 3.3

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Atma-Sphere S-60 Mk. 3.3 Amplifier

For years now the M-60 in its various forms has been the subject of the Soundstage!.com Hall of Fame Award, The Absolute Sound Golden Ear Award and Editor’s Choice, with numerous accolades in the press and on the web.

The M-60 Mk. 3.3 continues that tradition with classic styling and its award-winning state-of-the-art performance. The M-60 gives you the features and precision performance of our larger models in a beautiful, 60-watt package.

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Product Description

0% Financing Available!!

Atma-Sphere S-60 Mk. 3.3 Monoblock Amplifier

For years now the M-60 in its various forms has been the subject of the Soundstage!.com Hall of Fame Award, The Absolute Sound Golden Ear Award and Editor’s Choice, with numerous accolades in the press and on the web.

The M-60 Mk. 3.3 continues that tradition with classic styling and its award-winning state-of-the-art performance. The M-60 gives you the features and precision performance of our larger models in a beautiful, 60-watt package. The amp operates class A and is unconditionally stable with reliability proven over many years. The power tubes are inexpensive, readily available and do not require any matching. Sporting a classic, open-chassis construction, the M-60 Mk. 3.3 sets the bar for hi-end amplifier performance.

  • Balanced Differential Design®
  • Class-A2 operation
  • Patented Circlotronic® direct-coupled (OTL) output stage
  • Automatic bias – no adjustment needed
  • Built in VU meter for tube and output monitoring
  • Easily monostrapped for greatly increased power
  • Standby switch for long output tube life
  • Uses only one gain stage for simplicity and 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

 

Output Power

60 watts per channel into 8 Ω load
45 watts per channel into 4 Ω load
80 watts per channel into 16 Ω load

Impedance

Input Impedance: 100 KΩ single-ended, 200 KΩ balanced
Output Impedance: ~4.1 Ω

Input

3 V sensitivity ( for full output )
RCA and XLR true balanced input

Tube complement

( per channel ) 8 x 6AS7G output tube
4 x 6SN7 driver tube

Gain

20dB ( for 8 Ω )

Power Bandwidth

2Hz-75KHz within ½ dB

Frequency response

( 1 watt, open loop ) 20 Hz squarewave Tilt; unmeasureable
1Hz-200KHz within 3 dB

Distortion

Total Harmonic Distortion ( THD ) typically under 1%
Intermodulation ( IM ) distortion typically under .04% at full power
Phase shift less than 1° @ 20KHz

Output section risetime

600 V/µs

Feedback

1 dB

Power consumption

( per channel ) 300 watts

Power Supply storage

( per channel ) 140 Joules

Dimensions

( per chassis ) 13″ deep x 17″ wide x 8″ tall ( 33 x 43 x 20 cm )

Weight

( per chassis, without tubes ) 30 lbs ( 13.6 kg )

Warranty

Three year general coverage
One year for output tubes

 

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SPECIFICATIONS
Atma-Sphere M-60 Mk. 3.3 Monoblock Amplifier

Output Power
60 watts per channel into 8 Ω load
45 watts per channel into 4 Ω load
80 watts per channel into 16 Ω load 
Impedance
Input Impedance: 100 KΩ single-ended, 200 KΩ balanced 
Output Impedance: ~4.1 Ω 
Input
3 V sensitivity ( for full output ) 
RCA and XLR true balanced input 
Tube complement
( per channel ) 8 x 6AS7G output tube 
4 x 6SN7 driver tube 
Gain
20dB ( for 8 Ω ) 
Power Bandwidth
2Hz-75KHz within ½ dB 
Frequency response
( 1 watt, open loop ) 20 Hz squarewave Tilt; unmeasureable 
1Hz-200KHz within 3 dB
Distortion
Total Harmonic Distortion ( THD ) typically under 1% 
Intermodulation ( IM ) distortion typically under .04% at full power 
Phase shift less than 1° @ 20KHz 
Output section risetime
600 V/µs 
Feedback
1 dB
Power consumption
( per channel ) 300 watts 
Power Supply storage
( per channel ) 140 Joules 
Dimensions
( per chassis ) 13″ deep x 17″ wide x 8″ tall ( 33 x 43 x 20 cm ) 
Weight
( per chassis, without tubes ) 30 lbs ( 13.6 kg ) 
Warranty
Three year general coverage 
One year for output tubes