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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
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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)
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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
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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"
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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)
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