If anyone is interested in seeing the internals of this this Musmy A-75 here they are and yes I’m aware that the Vu meters say “pean” they never fixed this mistake on this product, there is a newer version of this model out that is twice the price for some reason.
A-75 technical parameters：
1： Rated continuous output power (20HZ-20000HZ)
Pure Class A: Stereo sound：
480W X2 1 ohm output
240W X2 2 ohm output
120W X2 4 ohm output
60W X2 8 ohm output
Fully balanced bridging：
960W X2 2 ohm output
480W X2 4 ohm output
240W X2 8 ohm output
2： Frequency response：
Continuous rated output ：20-20000HZ +0 -0.2db
1W output： 0.5-160000HZ +0 -3 dB
3： S/N signal-to-noise ratio full frequency band 118dB
4： Total harmonic distortion: 0.05 2 ohms 0.01% 8 ohms
5： Input impedance: 40K (balanced input), 20K (RCA input)
6： Input sensitivity: 0.87V rated continuous average output
0.11V output 1 watt power
7： Gain attenuator: MAX -3dB -6dB -12Db
Corresponding magnification: 28 25 22 16
8： Damping coefficient 1000
9： Amplification factor of 28dB
10： Static power consumption 260W, maximum power consumption 520W
11： Overall size 430W * 225 H * 500 Dmm
12： Net weight 28 (kg)
Features:
●Class A output, 120W4 Ω × 2 stereo sound
●The output adopts 12 field-effect power transistors per channel, which can drive impedance as low as 1 Ω.
● The input adopts an exclusive white master developed fully balanced low noise module, which can greatly expand the frequency
response of music, improve sound clarity and intensity
●The voltage amplification section adopts two sets in parallel to reduce input noise and improve dynamic range.
●Adopting DC stabilization technology to ensure stable operation of the power amplifier.
● Add (220V) voltage isolation technology to effectively isolate DC from entering the transformer.
“A-75 includes an upgraded version of the "MCS+circuit" with an initial slow charging amplifier circuit equipped with "MCS", an improved version of the multi-stage parallel circuit design, combined with a current feedback design, to ensure linear response at each level. The amplification unit circuit is connected in parallel to reduce noise, and a DC stabilized power supply is installed in the drive section and MCS+circuit to improve SN ratio and sound purity. The high-efficiency large transformer is stored in a metal cover, combined with a "super large pond" filtering group, to provide sufficient and stable power supply. The amplifier part adopts a fully balanced amplification circuit design, with 12 high-power field-effect transistors used for amplification output ineach channel, achieving high-quality and high driving force. It provides pure Class A 60W x2 (8 Ω), 120W x2 (4 Ω), 240W x2 (2 Ω), and 480W x2 (1 Ω) true power amplification outputs. Provide powerful power output and super strong driving capability.”
I’m going to hook it up this afternoon at some point.
Product is easy to find on alibaba or AliExpress.
A-75 technical parameters：
1： Rated continuous output power (20HZ-20000HZ)
Pure Class A: Stereo sound：
480W X2 1 ohm output
240W X2 2 ohm output
120W X2 4 ohm output
60W X2 8 ohm output
Fully balanced bridging：
960W X2 2 ohm output
480W X2 4 ohm output
240W X2 8 ohm output
2： Frequency response：
Continuous rated output ：20-20000HZ +0 -0.2db
1W output： 0.5-160000HZ +0 -3 dB
3： S/N signal-to-noise ratio full frequency band 118dB
4： Total harmonic distortion: 0.05 2 ohms 0.01% 8 ohms
5： Input impedance: 40K (balanced input), 20K (RCA input)
6： Input sensitivity: 0.87V rated continuous average output
0.11V output 1 watt power
7： Gain attenuator: MAX -3dB -6dB -12Db
Corresponding magnification: 28 25 22 16
8： Damping coefficient 1000
9： Amplification factor of 28dB
10： Static power consumption 260W, maximum power consumption 520W
11： Overall size 430W * 225 H * 500 Dmm
12： Net weight 28 (kg)
Features:
●Class A output, 120W4 Ω × 2 stereo sound
●The output adopts 12 field-effect power transistors per channel, which can drive impedance as low as 1 Ω.
● The input adopts an exclusive white master developed fully balanced low noise module, which can greatly expand the frequency
response of music, improve sound clarity and intensity
●The voltage amplification section adopts two sets in parallel to reduce input noise and improve dynamic range.
●Adopting DC stabilization technology to ensure stable operation of the power amplifier.
● Add (220V) voltage isolation technology to effectively isolate DC from entering the transformer.
“A-75 includes an upgraded version of the "MCS+circuit" with an initial slow charging amplifier circuit equipped with "MCS", an improved version of the multi-stage parallel circuit design, combined with a current feedback design, to ensure linear response at each level. The amplification unit circuit is connected in parallel to reduce noise, and a DC stabilized power supply is installed in the drive section and MCS+circuit to improve SN ratio and sound purity. The high-efficiency large transformer is stored in a metal cover, combined with a "super large pond" filtering group, to provide sufficient and stable power supply. The amplifier part adopts a fully balanced amplification circuit design, with 12 high-power field-effect transistors used for amplification output ineach channel, achieving high-quality and high driving force. It provides pure Class A 60W x2 (8 Ω), 120W x2 (4 Ω), 240W x2 (2 Ω), and 480W x2 (1 Ω) true power amplification outputs. Provide powerful power output and super strong driving capability.”
I’m going to hook it up this afternoon at some point.
Product is easy to find on alibaba or AliExpress.
