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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