A-75 Class-A Stereo Power Amplifier
A-75 Class-A Stereo Power Amplifier
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A-75 Class-A Stereo Power Amplifier

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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

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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