ACCUPHASE A70

Inheriting many outstanding technology features of the A-200, the A-70 represents a full model change from the A-65, ready to take its place as the ultimate pure class A stereo power amplifier. While reflecting this tradition, the A-70 also implements latest technology such as the ultra low-noise instrumentation amplifier principle realized in a discrete configuration, along with optimized signal input and power amplification stages, resulting in an astonishing 127 dB S/N ratio (at -12 dB gain), surpassing even the formidable earlier Accuphase stereo amplifier lineup.

The output stage of the A-70 features power MOS-FETs renowned for their excellent frequency response, sonic performance, and superior reliability. In the output circuitry, ultra-heavy-gauge edgewise coils with a surface area more than three times larger than conventional units, combined with MOS-FET switches are used in place of relays, to eliminate mechanical contacts and improve long-term reliability. Top-grade materials, sophisticated circuit pattern technology, and various other measures result in low impedance and enable the realization of a damping factor of 800, which represents a two-fold improvement over the A-65.

• Pure Class A operation delivers quality power: 60 watts x 2 into 8 ohms
• Power MOS-FET output stage features 10-parallel push-pull configuration and delivers linear high power progression to ultra-low 1-ohm impedances
• Ultra low-noise instrumentation amplifier principle used in input stage
• Amplification stage implements further evolved MCS+ topology
• Current feedback principle combines stable operation with outstanding sound quality
• Bridged connection mode allows upgrading to monophonic amplifier
• Two selectable meter types: digital power meters showing true power values and bar graph indicators

Specifications of ACCUPHASE A70

Total Harmonic Stereo operation (both channels driven)
Distortion 0.07% with 2 ohm load
0.03% with 4 to 16 ohm load
Monophonic operation (bridged connection)
0.05% with 4 to 16 ohm load
●Intermodulation Distortion 0.01%
● Frequency Response At rated output: 20 - 20,000 Hz +0, -0.2 dB
At 1 watt output: 0.5 - 160,000 Hz +0, -3.0 dB
●Gain 28.0 dB (with GAIN selector at MAX)
(Stereo and monophonic operation)
●Gain Selection MAX, -3 dB, -6 dB, -12 dB
●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 monophonic operation.
●Damping Factor 800
● Input Sensitivity (with 8-ohm load, GAIN selector in MAX position)
Stereo operation: 0.87 V for rated continuous average output (60 W)
0.11 V for 1 watt output
Monophonic operation: 1.74 V for rated continuous average output (240 W)
0.11 V for 1 watt output
● Input Impedance Balanced: 40 kilohms Unbalanced: 20 kilohms
●Signal-to-Noise Ratio (A-weighted, input shorted)
121 dB (GAIN selector at MAX)
127 dB (GAIN selector at -12 dB)
At rated continuous average output
● Output Level Meters (digital indication and bar graph)
Digital meters: 5-digit indication, selectable range (10 W / 100 W / 1000 W)
Bar graph meters: 32-point scale
Hold time: 1 second/∞, switchable
＊Display off setting provided
＊Monophonic operation: same value for left/right
●Power Requirements AC 120 V/230 V, 50/60 Hz
(Voltage as indicated on rear panel)
●Power Consumption 280 watts idle
530 watts in accordance with IEC 60065
●Maximum Dimensions Width 465 mm (18-5/16")
Height 238 mm (9-3/8")
Depth 515 mm (20-1/4")
●Mass 44.3 kg (97.7 lbs) net
54.0 kg (119.0 lbs) in shipping carton

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