Golden Ear Award

Recipient of a Golden Ear Award (TAS 2000), the MA-1 has enjoyed an enviable reputation. Now the Mk.III series builds on the advances of our decades-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 new, rugged, non-magnetic chassis features classic looks with superior layout. Setup of the amplifier is simple with automatic bias. The controls and switches are ergonomic without sacrificing performance.

The MA-1 Mk.III is easy to live with. It is easy on tubes and and tube failure is inconsequential. Despite its extreme performance, the MA-1 is known for remarkable ease of setup, ease of operation and day to day consistency.

Our new custom wire, V-Cap Teflon coupling caps, custom resistors and the features below are why Atma-Sphere amplifiers are the best worldwide, regardless of cost.

FEATURES

• Balanced Differential Design®
• All triode
• No tube matching
• Class-A operation
• automatic bias
• Patented Circlotronic® Output transformerless operation (OTL)
• Handwired mono construction
• Easily monostrapped for more power
• Standby switch for long output tube life
• Simple, reliable circuit --one stage of gain
• XLR and RCA input connectors
• V-Cap Teflon coupling capacitors- standard
• Custom built wire and resistors
• Precision grade components used throughout
• "Star" ground circuit
• Neo-classic chassis is available in custom finishes
• Three-year warranty - One year on tubes

OPTIONS

• Caddock Resistor package $1100
• Power Supply Boost (uses custom built filter caps for MA-2) $2400
• A/AB switch (useful for home theatre and parties...does not affect class A sound) $700

SPECIFICATIONS

• 140 watts/channel into 8 ohm load/135 watts into 4 ohm load
• Power bandwidth: 2 Hz - 100 kHz within 1/2 db
• Frequency response (1 watt): 1 Hz - 200 kHz within 1/2 db
• IM distortion: less than .05% at full power
• THD: nominally less than 1%
• 20 Hz Square Wave Tilt: unmeasurable
• Phase shift: less than 1 degree @ 20 kHz
• Power supply storage: 600 Joules/chassis
• Input impedance: 100K single-ended, 200K balanced
• Output section risetime: 600V/micro-second
• Output Impedance ~2.3 Ohms (power standard measurement)
• Power consumption: 500 watts/chassis
• Tube complement: 14 6AS7s and 5 6SN7s per channel
• Weight: 36 lbs./chassis
• dimensions 18" L x 17" W x 8.5" H