25 W CLASS-A ZERO NEGATIVE FEEDBACK AMPLIFIER for 850$?…
“The Class-A Amplifier M2-X is a 2 channel audio power amplifier delivering 25 watts per channel. It uses JFET and MOSFET transistors operating in Class A mode with zero negative feedback so as to produce a more musically concert-like sound.”
The M2-X is a simple circuit whose output stage consists of a pair of complementary power Mosfet followers biased into pure Class A mode. These devices are the current gain stage of the amplifier, very linearly following the musical signal produced by the voltage gain stage. The voltage amplification is created through an Step Up Transformer which magnetically multiplies the input voltage.
Great attention has been paid to the linearity of the gain stages of the M2-X, resulting in a power amplifier whose performance is good enough to avoid negative feedback altogether. This is rarely achieved at a reasonable cost, and at this time the M2-X serves as one of the best examples of the benefits of an amplifier with passive voltage amplification and no feedback.
The design is extremely reliable and will never need adjustment. It achieves a relaxed sound with a very organic character and dynamics well beyond the expectations of the power rating.
The simplicity and performance of the circuit allows a unique sonic experience that is likely to make you go through your entire record collection all over again.
■ Gain: 14 dB 500mV/1W 、3V/
■ Input Sensitivity: 500mV/1W output, 3V / rated output +0,-0.5 dB at 20 Hz 〜 25 kHz
■ Frequency Response: +0, -0.5 dB at 20 Hz ~ 25 kHz 25W /1%THD 1kHz 8 Ω
■ Output power: 25W / 1% THD 1kHz 8 Ω
■ Distortion: 0.025% THD, 1W output at 1 kHz, 8 Ω
■ Input impedance: 100k Ω
■ Damping Factor: 20
■ Output Noise: 500 uV A-weighting 20-20 kHz
■ Balanced CMRR: -60 dB @ 1 kHz
■ Power Consumption: 160 watts
■ Dimensions: 430 W x 385 D x 143 H mm
■ Weight: 20 kg
Price: 850USD
link: here
