Atma-Sphere Music Amplifier M-60 MK 3.1

Atma-Sphere Music Amplifier M-60is winner of multiple awards including Reviewer’s Choice, Golden Ear, Hall of Fame, and The Absolute Sound 2008 Editor’s Choice.

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. 3.1 continues that tradition with classic styling and its award-winning State-of-the-Art performance. The M-60 Mk. 3.1 gives you the features and precision performance of our larger models in a 60 watt, easy-to-live-with package. The amp operates class A and is unconditionally stable with proven reliability. The power tubes are inexpensive, readily available and do not require any matching. Now sporting a classic open chassis construction, the M-60 Mk. 3.1 sets the bar for amplifier performance.

FEATURES

• Exclusively triode-based, vacuum tube circuitry
• Class A operation
• Automatic Bias- no adjustment needed
• Patented Atma-Sphere direct-coupled (OTL) output stage
• Balanced Differential Design®
• Mono chassis construction
• Easily monostrapped for greatly increased power
• Standby switch for long output tube life
• Single stage of gain
• Rear-mounted XLR and RCA input connectors
• VU meter for power and tube monitoring
• 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
• Three-year general warranty, one year on output tubes

OPTIONS

• Custom volume control $1200.00
• V-Cap Teflon® caps $500
• Power supply boost $400
• Caddock® resistor package $1100
• Meter panel color options: anodized brushed gold, black or silver,no charge

SPECIFICATIONS

• 60 watts/channel into 8 ohm load/ 45 watts/ch. into 4 ohms/ 80 watts/ch. into 16 ohms
• Power bandwidth: 2 Hz – 75 kHz within 1/2 db
• Input impedance: 100Kohm single-ended, 200Kohm balanced
• Input voltage for full output: 2.83V
• Frequency response (1 watt): 1 Hz – 100 kHz within 3 dB
• Intermodulation Distortion: .05% @ full power
• THD: typically under .5% with proper setup.
• 20 Hz square wave tilt: unmeasurable
• Phase shift: less than 1 degree @ 20 kHz
• Power supply storage: 140 Joules/chassis
• Input impedance: 100K single-ended, 200K balanced
• Output section risetime: 600 V/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: 17″ wide x 13″ deep x 8″ high