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Accuphase C-3850 Stereo Preamplifier

Accuphase



C-3850 Stereo Preamplifier

The new Precision Stereo Preamplifier C-3850 continues the challenge and raises the bar even further, bringing together the entire wealth of preamplifier know-how gained by Accuphase over the years. In construction as well as circuit design, it incorporates latest technology realized with components selected through a thorough review process including extended listening tests. The result is an audio instrument that admits no compromise in the pursuit of peerless performance for musical mastery.
The C-3850 features a further evolved version of this principle, called "Balanced AAVA", with two AAVA circuits driven in a parallel balanced configuration. AAVA does not "turn down" the volume in the ordinary sense. Rather, it switches a combination of V-I amplifiers as required in order to directly change the amplifier gain and thereby achieve the desired volume. This revolutionary approach eliminates impedance changes as well as adverse effects from noise and other factors.
The entire path for all signals from the input connectors to the outputs is fully balanced, and signal purity is further elevated by the use of ultimate-quality parts and materials, ensuring electrical characteristics and sonic excellence of the highest order. With its no-holds-barred use of resources, and its bold realization of latest circuit design, the C-3850 is an analog preamplifier that redefines the state of the art and points the way towards the future.

  • Revolutionary low-noise "Balanced AAVA Volume Control"
  • High-rigidity, high-accuracy volume knob sensor mechanism
  • Separate high-efficiency toroidal power transformers for left and right channels
  • Selectable preamp gain
  • Fully modular construction with separate left/right units for each amplifier stage
  • Logic-controlled relays for shortest signal paths
  • Independent phase selection for each input position
  • Printed circuit boards made from glass cloth fluorocarbon resin
  • Massive wood cabinet with natural grain finish

    Download the Brochure here.

    Download the Fact Sheet here.

     

    Frequency Response BALANCED/LINE INPUT 3 - 200,000 Hz +0 -3.0 dB 20 - 20,000 Hz +0 -0.2 dB
    Total Harmonic Distortion (for all inputs) 0.005%
    Input Sensitivity, Input Impedance
    Input
      Input sensitivity
    For rated output   For 0.5 V output
      Input impedance
    BALANCED
    252mV   63 mV
    40 kilohms (20kilohms/20kilohms)
    LINE
    252 mV   63 mV
    20 kilohms

    Rated Output Voltage,

    Output Impedance

    BALANCED/LINE OUTPUT   2 V 50 ohms
      S/N Ratio
    Input
      Input shorted (A weighting)
    S/N ratio at rated output
    EIA S/N
    BALANCED 115 dB 110 dB
    LINE 115 dB 110 dB
    Maximum Output Level (0.005% THD, 20 ‒ 20,000 Hz)
    BALANCED/LINE OUTPUT: 7.0 V
      RECORDER REC (with AD input): 6.0 V 
    Maximum Input Level

    BALANCED INPUT: 6.0 V

    LINE INPUT: 6.0V

    Minimum Load Impedance
    BALANCED/LINE OUTPUT:   600 ohms
    RECORDER REC 10 kilohms
    Crosstalk -90 dB or better at 10 kHz (EIA)

    Gain (18 dB position)

    *Gain selector allows increase or decrease by 6 dB, except for REC output.

    BALANCED INPUT → BALANCED OUTPUT: 18 dB
    BALANCED INPUT → LINE OUTPUT: 18 dB
    LINE INPUT → BALANCED OUTPUT: 18 dB
    LINE INPUT → LINE OUTPUT: 18 dB
    BALANCED/LINE INPUT → RECORDER REC: 0 dB
    Loudness Compensation 1: +2 dB (100 Hz), 2: +4 dB (100 Hz), 3: +6.5 dB (100 Hz)
    Headphone Jack

    Suitable impedance: 8 ohms or above

    Output Level: 2 V (40 ohms)

    Gain (LOW, MID, HIGH): ±10 dB from standard MID level

    Attenuator –20 dB
    Power Requirements AC120 V/220 V/230 V 50/60 Hz (Voltage as indicated on rear panel)
    Power Consumption 55 watts
    Maximum Dimensions

    Width 477 mm (18-3/4”)

    Height 156 mm (6-1/8”)

    Depth 412 mm (16-1/48”)

    Mass 25.0 kg (55.1 lbs) net 32.0 kg (70.6 lbs) in shipping carton

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