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A-75 Class-A Stereo Power Amplifier

Vendor: Accuphase
A-75 Class-A Stereo Power Amplifier - Trimira
A-75 Class-A Stereo Power Amplifier



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




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


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


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")


43.9kg (96.8 lbs) net

54.0kg (119.0 lbs) in shipping carton



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Our in-house team can service those in Brisbane, the Gold Coast, and the Sunshine Coast. Give us a call to get an obligation-free quote today!

*the term 'professional bodybuilders' is used here loosely...

Our refund policy operates in a 30-day window - after this time we are unable to accept the product and cannot issue a refund. Don't worry, our products are hand picked from thousands of luxury brands to ensure you are only offered the best of the best so we doubt you'll need to consider this policy at all. If you are concerned about making the wrong decision when it comes to your purchase, please feel free to talk with our team of experts who can advise you on equipment based on your personal music taste, aesthetics, and the layout of your listening room. Still not convinced? Discuss the possibility of a loan (trial period) with our experts and hear the difference yourself.

Our refund policy can be viewed here.

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