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
Audio Traveller
Part Time Audiophile, Josh Emmons, Axpona 2015
The Absolute Sound
Sue Kraft, April 2009
Scot Markwell, April 2002
AudioReview.com
Ocean, November 2018
Various, user submitted
Dagogo.com
Jack Roberts, December 2010
Enjoy the Music
Wayne Donnelly, March 2003
Follow up, Wayne Donnelly, with ZERO autoformers, July 2003
Glass Audio
Charles Hansen, 1998
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
V-Cap Copper Foil Teflon® coupling caps
Power supply boost
Caddock® resistor package
Custom volume control
Meter Panel finish options
Gray Hammertone
Brushed anodized black
Brushed anodized silver
Brushed anodized gold
Custom finishes available
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 Interconnects
Balanced phono cables
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.
The M-60 kit is back!
We are now offering an M-60 in kit form based on the Mk. 3.2 revision. It has the same features and specifications as the stock factory-built version and is available with all of the same options.
You get all of the same factory components you need to build a stereo pair of M-60 Mk 3.2 amplifiers including two powder-coated chassis, lengths of our custom wire, and a full set of driver and power tubes.
Most importantly, it comes with thorough pictoral doctumentation and up to two hours of telephone consult time to help you get your new M-60 up and running smoothly.
Order
Contact your local
dealer for pricing information.
Or, call (651) 690-2246 or
email us with any questions.