Atma-Sphere MP-1 Mk 3.3

In 1989, the first MP-1 introduced balanced line technology to the world of high end audio. It was the first balanced, fully-differential preamp ever made, and it included a range of innovations that were breakthroughs at the time, and remain so today. With a history of years of refinement, patents, and awards, the MP-1 is a paragon of the audio world.

The MP-1 Mk. III.2 is unique in the world of preamplifiers. It easily outperforms any passive or transformer volume control as well as conventional line stages. This is because of a patented circuit that prevents coloration from interconnect cables. And with only three stages of gain in the entire preamp, the Balanced Differential Design® not only assures an elegant signal path, it assure low distortion, wide bandwidth, and dynamic range. No matter what you thought was the best, the MP-1 is an audible improvement.

  • Balanced Differential Design®
  • XLR connectors for phono and aux
  • XLR output connections
  • Patented direct-coupled Circlotronic® output
  • Fully regulated supplies featuring proprietary circuitry
  • Zero feedback design
  • Dual-mono construction
  • Differential passive phono equalization
  • Precision 24-position stepped volume control built from a Shallco® custom switch
  • Two tape monitors (tape functions use RCA's)
  • Precision components used throughout
  • Total system phase switch
  • Teflon® custom coupling caps
  • Low-noise "star" grounding topology
  • Power supply isolated in seconds chassis
  • Headphone compatible with a simple connector
  • Three-year general coverage warranty with one year warranty on output tubes


$14,250.00 (linestage only)                                
$16,600.00 (with phono stage)                         

Optional Features

  • Remote Volume Control: $950
  • V-CAP Copper foil capacitors for line stage: $600
  • V-CAP Copper foil capacitors throughout: $1,900
  • Caddock resistor package: $2,160
  • Caddock volume control: $2,990
  • Low output Moving-Coil step-up transformers: $750 (for cartridges under 0.2 mV).
  • Damping package: $600
  • Dual outputs: $75