Recipient of The Absolute Sound’s prestigious “Golden Ear Award” in 2000, the MA-1 enjoys an enviable reputation. Now the Mk. 3.3 series builds on 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 rugged, non-magnetic chassis features classic looks with superior layout. Setup of the amplifier is simple with it’s automatic biasing system. The controls and switches are ergonomic without sacrificing performance.

The MA-1 is extraordinary in every way. Not only is normal operation easy on the vacuum tubes, the effect of a tube failure on the unit is entirely inconsequential. Despite its extreme performance, the MA-1 is known for remarkable ease of setup, ease of operation, day-to-day consistency and of course extreme musicality.

Featuring our new custom wire, V-Cap Teflon coupling caps, custom resistors, and all the other extras for which we are known, the MA-1 shines as an example of why our amplifiers are the best amplifiers worldwide, regardless of cost.

• • Balanced Differential Design®
  • Class-A operation
  • Patented Circlotronic® direct-coupled (OTL) output stage
  • Automatic biasing system
  • V-Cap copper foil Teflon coupling capacitors
  • Built in VU meter for tube and output monitoring
  • Easily monostrapped for greatly increased power
  • Uses only one gain stage for supreme clarity of sound
  • Proprietary precision components used throughout
  • Low-noise “star” grounding topology
  • Fully hand wired point to point
  • Stable with all input and load conditions
  • Exclusively uses Octal-Triode based vacuum tubes
  • Classic open chassis construction with Wrinkletex™ finish

Three-year general coverage warranty with one year warranty on output tubes

Output power

140 watts per channel into 8 Ω load
135 watts per channel into 4 Ω load

Impedance

Input Impedance: 100 KΩ single-ended, 200 KΩ balanced
Output Impedance: ~2.3 Ω (power method standard measurement)

Input

2.8 V sensitivity
RCA and XLR true balanced input

Tube complement

( per channel ) 14 x 6AS7G output tube
5 x 6SN7 driver tube

Gain

25 dB ( for 8 Ω )

Power Bandwidth

2 Hz-200 KHz within ½ dB

Frequency response

( 1 watt, open loop ) 20 Hz squarewave Tilt; unmeasureable
1Hz-300KHz within 3 dB

Distortion

Total Harmonic Distortion ( THD ) typically 0.5% at full power
Intermodulation ( IM ) distortion typically under .005% at full power
Phase shift less than 1° @ 20KHz

Output section risetime

600 V/µs

Power consumption

( per channel ) 500 watts

Power Supply storage

( per channel ) 600 Joules

Dimensions

( per chassis ) 18″ deep x 17″ wide x 8.5″ tall ( 46 x 43 x 22 cm )

Weight

( per chassis, without tubes ) 36 lbs. ( 16.3 kg )

Warranty

Three year general coverage
One year for output tubes