Accuphase A-250 Class-A Monophonic Power Amplifier

₹ 2,299,999.00

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Ooberpad announces the availability of the feature-packed Accuphase A-250 Class-A Monophonic Power Amplifier. Ultra-low-noise design with an unprecedented S/N ratio of 127 dB brings out a superb wealth of detail. Semiconductor MOS-FET switches facilitate output circuitry without any mechanical contacts. Two pure class-A power units arranged right and left are driven in parallel to render100 watts into 8 ohms with superb quality. A damping factor in excess of 1,000 means that speaker control is nothing less than perfect. The huge A-250 embodies a new pinnacle in power amplifier history. Encounter music in the most surreal way.


1-year manufacturer's warranty

Key Features:

  • Pure Class A operation delivers 100 watts of quality power into 8 ohms
  • Two totally identical power amplifier units driven in parallel
  • 20-parallel push-pull arrangement of MOS-FET devices in output stage delivers linear high power progression to ultra-low 1-ohm impedance
  • Input section configured as dual instrumentation amplifier
  • Double MCS+ circuit and current feedback topology in amplification stage
  • Support for bridged use of two A-250 units for even higher output power
  • Strong power supply with massive high-efficiency toroidal transformer and large filtering capacitors

Benefits of Accuphase A-250 Class-A Monophonic Power Amplifier:

Fully Balanced Signal Paths
Fully Balanced Signal Paths

The A-250 features fully discrete circuit components in a dual configuration employing the latest instrumentation amplifier topology, allowing all signal paths throughout the power amplifier to be fully balanced. This not only eliminates any possible internal sources of noise or distortion as demonstrated by the outstanding performance ratings, it also makes the amplifier highly impervious to changes in ambient conditions. Consequently, operation stability and reliability which are crucial for a power amplifier have been dramatically enhanced.

Double MCS+ (Multiple Circuit Summing) in amplifier stage realizes highest-ever signal/noise ratio in an Accuphase component
Fully Balanced Signal Paths

The Double MCS+ configuration uses four circuits for amplifying the input signal, connected in parallel to keep distortion to a minimum and to further enhance S/N ratio and other parameters. The resulting level of sound quality is simply stunning.

Two totally identical power amplifier units driven in parallel

As shown in the circuit diagram of the amplifier section, the power amplification stage makes use of two completely identical power units, each with 10 N-chan- nel and 10 P-channel power MOS-FETs connected in parallel. These units are arranged on the left and right side of the chassis and driven in parallel, resulting in a 20-parallel configuration. This ensures a stable balance in terms of electrical operation, weight distribu- tion, thermal dissipation and other aspects. The parallel drive approach achieves a total allowable power dissipation value of 5.2 kW, which in turn reduces the power load on each MOS-FET, allowing each device to operate effectively in its range of optimum linearity

Where to buy?
Buy the Accuphase A-250 Class-A Monophonic Power Amplifier online at the best price in Mumbai, Delhi, Bangalore, Chennai and all across India. Enjoy expert, prompt and courteous customer service from the Ooberpad team. We will help you choose better and give you all the support you need to take the right buying decision in India.

Technical Specifications of Accuphase A-250 Class-A Monophonic Power Amplifier:

Brand & Model # Accuphase A-250
Continuous Average Output Power (20 - 20,000 Hz)
  • Normal mode 800 watts into 1 ohm *1 400 watts into 2 ohms 200 watts into 4 ohms 100 watts into 8 ohms *2
  • Bridged mode (2 units) 1,600 watts into 2 ohms *1 800 watts into 4 ohms 400 watts into 8 ohms
    Notes: (*1) Ratings marked *1 are for music signals only. (*2) The output range for pure class A operation is 100 W.
Total Harmonic Distortion
  • 0.05% with a 2-ohm load
  • 0.03% with a 4 to 16-ohm load
  • 0.01%
    Frequency Response
    • At rated continuous average output: 20 – 20,000 Hz +0 -0.2 dB
    • At 1 watt output: 0.5 - 160,000Hz +0 -3.0 dB
    • MAX, –3 dB, –6 dB, –12 dB
    Gain Selection
    • -12 dB, -6 dB, -3 dB, MAX
    Output Load Impedance
    • Continuous output: 2 to 16 ohms
    • With music signal: 1 to 16 ohms
    Input Sensitivity (with 8-ohm load)
    • 1.13 V for rated continuous average output
    • 0.11 V for 1 watt output
    Input Impedance
    • Balanced: 40 kilohms
    • Line: 20 kilohms
    Signal-to-Noise Ratio (A-weighted, with input shorted)
    • 127 dB (GAIN selector in MAX position)
    • 133 dB (GAIN selector in -12 dB position) At rated continuous average output
    Output Level Meter
    • Digital power meter 5-digit indication showing true power (W) Range selection AUTO / 10 W / 100 W / 1,000 W
    • Bar graph meter Represents output voltage values (dB) using 40 points
    • Peak hold time 1 second / ∞ (infinite) selectable *Display off switch provided
    Power Consumption
    • 300 watts idle
    • 430 watts in accordance with IEC 60065
    Maximum Dimensions
    • Width 465 mm (18.31)
    • Height 238 mm (9.37)
    • Depth 514 mm (20.24)
    • 46.0 kg (101.4 lbs) net

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