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Accuphase A-75 Class-A Stereo Power Amplifier

Accuphase



A-75 Class-A Stereo Power Amplifier

Instrumentation amplifier topology using discrete semiconductors realizes ideal gain allocation. Balanced Remote Sensing optimizes efficiency of negative feedback. 10-parallel push-pull configuration in power amplification stage. The overall result is outstanding S/N ratio and amazingly high damping factor. Furthermore, constant-voltage drive handles even drastic speaker impedance fluctuations with ease. Power MOS-FETs and other carefully selected components and materials make this Pure Class A Stereo Power Amplifier a sheer delight to experience.

  • Pure Class A stereo power amplifier with outstanding S/N ratio and very high damping factor
  • Rated for 60 watts into 8 ohms and 480 watts into 1 ohm
  • Power MOS-FETs in 10-parallel push-pull configuration
  • Instrumentation amplifier principle
  • All signal paths realized with discrete semiconductor components
  • Balanced Remote Sensing principle
  • MCS+ circuit topology
  • Current feedback amplification principle
  • Digital power value readout and bar graph voltage indication
  • Support for bi-amping and bridged mode

    Download the Brochure here.

    Download the Fact Sheet here.

     

    Continuous Average Output power (20-20,000 Hz)

    Stereo Operation (both channels driven: 

     

    480 W/ch = 1-ohms load *

    240 W/ch = 2-ohms load

    120 W/ch = 4-ohms load

    60 W/ch = 8-ohms load

    Monophonic Operation:

    960 watts = 2 ohms load*

    480 watts = 4 ohms load

    240 watts =  8 ohms load

    Notes:

    Ratings marked. with * are for music signals only

    Total Harmonic Distortion

    Stereo operation ( both channels driven )

    0.07% with a 2-ohm load

    0.03% with a 4 to 16-ohm load

    Monophonic operation (bridged connection)

    0.05% with a 4 to 16 ohm load

    Intermodulation Distortion 0.01% 
    Frequency Response

    At rated continuous average output: 20 - 20 000 Hz + 0 - 0.2dB

    At 1 watt output: 0.5 - 160000Hz +0 - 3.0dB

    Gain

    28.0dB ( GAIN selector in MAX position)

    (Stereo/monophonic operation)

    Gain Selector

    MAX - 28dB

    -3dB - 25dB

    -6dB - 22dB

    -12dB - 16dB

    Output Load Impedance

    Stereo Operation: 2 to 16 ohms

    Monophonic Operation: 4 to 16 ohms

    * With music signals only, 1-ohm loads are permissible for stereo operation and 2-ohm loads for bridged operation.

    Damping factor 1 000
    Input Sensitivity ( with 8-ohm load)

     

    Stereo Operation

    0.87V for rated continuous average output

    0.11V for 1 watt output

    Monophonic Operation

    1.74V for rated continuous average output

    0.11V for 1 watt output

    Input Impedance

    Balanced: 40 Kilohms

    Line (unbalanced): 20 Kilohms

    Signal-to-Noise Ratio

    (A-weighted, with input shorted)

    122dB (GAIN selector in MAX position)

    128dB (Gain selector in  -12dB position)

    At rated continuous average output

    Output Level Meter

    Digital Power Meter:

    Indicates output power (W) with 5 digits Display range switchable AUTO / 10W / 100W / 1000W

    Bar graph meter:

    Represents output voltage values (dB) using 38 points

    Hold time:

    1 second / infinite selectable

    *Display off switch provided

    Power Requirements 120/220/230 V AC, 50/60 Hz
    Power Consumption

    260 watts idle

    520 watts in accordance with IEC 60065

    Maximum Dimensions

    Width: 465mm (18.31")

    Height: 238mm (9.37")

    Depth: 515mm (20.28")

    Mass

    43.9kg (96.8 lbs) net

    54.0kg (119.0 lbs) in shipping carton

     


     

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