The OM1 Preamplifier

New Model

The Optional Phono Stage

The AC4 Power Supply

The DC12 Battery Power Supply

Technical Specifications

About the designer, Stephen Balliet

Contact

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OM1 design features and specifications:

  • Ultra fast 2500 V/µsec. hybrid microchip design (transients and detail resolution)
  • Phase accuracy of ± 0.5° through the audio bandwidth (improved soundstage)
  • Direct coupled: no capacitors or servos in the audio path
  • Class A biased: sweet sound without crossover distortion
  • Minimal signal path: DC-2.0mHz
  • 31 position, precision stepped resistor, shunt attenuator: reliable 0.1db tracking
  • RF filtered power line: reduced out-of-band interference
  • 1.0% metal film resistors, Cardas rhodium plated connectors
  • Both balanced and single ended inputs and outputs
  • A special adapter converts balanced output into a second inverted unbalanced output for use in biamplification
  • Total harmonic distortion (plus noise) at 1k: .0014%
  • Output impedance: 50 unbalanced, 100 balanced
  • Maximum output: +20dbu balanced, +14dbu unbalanced
  • 114db dynamic range
  • Line stage gain: 8db, unbalanced; 14db balanced
  • Dimensions: Width 17", Height 4", Depth 14"
  • Combined weight (OM1 with AC4): 26lbs (12kg)

Phono stage specifications:

  • Noise floor within 1.5db of theoretical minimum
  • Two stage design: passive high frequency filter; active low frequency stage
  • 0.1% resistors and custom 1% polypropylene and polystyrene caps
  • Moving magnet version: 40db gain, 47k, 150pf
  • Moving coil version: 60db gain, 1k (adjustable)
  • A special high gain ( 70db) (78 / 84 total) version is available allowing the use of even the lowest output MC cartridges
  • RIAA frequency response: ± .1db 20Hz to 20kHz

 

AC4 power supply specifications:

  • precision regulated, low impedance, high current power supplies
  • four separate, fully floating power supplies
  • toroidal power transformer
  • high capacity 50k + µF power reserve: effortless dynamics and bass extension
  • Dimensions: Width 7.75", Height 3.5", Depth 12"

The OM1 Preamplifier

New Model

The Optional Phono Stage

The AC4 Power Supply

The DC12 Battery Power Supply

Technical Specifications

About the designer, Stephen Balliet

Contact

Links

Home

 

DC12 battery power supply features:

  • 16 amp hours of pure DC power-up to 36 hours of play
  • Balanced Power to each channel is fully isolated from AC when in play mode
  • True one point star ground preserved throughout preamplifier circuit
  • Fully automatic recharging. Minimal effect on sound quality during charge cycle
  • Memory-free batteries
  • High mass damping and RF shielding of preamplifier
  • Projected battery life: greater than 5 years
  • Dimensions: Width 17", Height 3.5", Depth 12"
  • Weight: 35lbs (18kg)