“the M-60 Mk II.2s are amazingly neutral, with tight, subterranean bass response that is at the same time airy, weighty, and nimble; a spectacularly luminous midband with the dimensionality and liquidity of tubes and the speed and articulation of solid state; and a treble at once soft, sweet, and remarkably extended.”


Scott Markwell; The Absolute Sound Golden Ear Award 2002
[click here for full article]
The M-60 Mk II is for audiophiles who seek the ultimate in amplifier design and are realistic about their budget. The M-60 Mk. II.3 gives you the features, precision and performance of the larger Atma-sphere models in a 60 watt package. Operating the amplifier is easy with the built-in bias meter. It is stable with any load and is extremely reliable. The first prototype of the M-60 was built in 1980 is still running today with over 20,000 hours on the same output tubes! Now redesigned with a classic open chassis construction, the M-60 Mark II outperforms any single-ended amplifier ever made.

The M-60 Mk. II.3 fully embodies the same level of excellence achieved in Atma-sphere’s highest-priced models and represents the state of the art in thermionic audio amplifiers. Its balanced line compatibility and proven class-A triode circuitry make the M-60 the ideal choice for the discriminating audiophile.

Further reading...

Golden Ear Award 2002
The Absolute Sound

Hall of Fame Award 2001
Soundstage!.com

·  Exclusively triode-based, vacuum tube circuitry
·  Pure class-A operation
·  Patented Atma-Sphere direct-coupled (OTL) output stage
·  Balanced Differential Design®
·  Mono chassis construction
·  Easily mono-strapped for greatly increased power
·  Standby switch for long output tube life
·  Only one stage of gain throughout
·  XLR and RCA input connectors
·  Proprietary, precision grade components used throughout
·  Low-noise "star" ground circuit
·  Fully hand wired electronics; no circuit boards!
·  Classic open chassis construction, with Wrinkletex finish
·  Two-year general coverage warranty, one year on output tubes
·  Black Wrinkletex finish with welded and polished stainless steel chassis, built in reflected pairs
·  Three-year warranty - One year on tubes
 
Upgrade options:
·  Custom Teflon® coupling caps
·  Caddock® resistor package
·  Power supply upgrade

·  60 watts/channel into 8 ohm load; 45 watts/4 ohms; 80/16 ohms
·  Power bandwidth: 2 Hz - 75 kHz within 1/2 db
·  Frequency response (1 watt): 1 Hz - 100 kHz within 3 dB
·  IM Distortion: .05% @ full power
·  THD: typically under 1% with proper setup
·  20 Hz Square Wave Tilt: unmeasureable
·  Phase shift: less than 1 degree @ 20 kHz
·  Power supply storage: 140 Joules/chassis
·  Output section rise-time: 600V/micro-second
·  Output Impedance: ~4.1 Ohms
·  Feedback: 1 db
·  Power consumption: 300 watts/chassis
·  Tube complement: 8 6AS7/channel and 4 6SN7s
·  Weight: 30 lbs./chassis
·  Dimensions 11" wide x 24" deep x 7" high