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Yamaha M-50 Power Amplifier (Vintage)
Originally released around 1982-1983, this "Natural Sound" amplifier is a 2-channel component designed for high-fidelity home audio setups.
Power Output: According to Hi-Fi Classic, it delivers 120 watts per channel into 8-ohm loads with extremely low total harmonic distortion of 0.002%.
Audio Technology: It features Yamaha's Zero Distortion Rule (ZDR) circuit and a "signal-tracking" X power supply designed for higher efficiency.
Physical Specs: Reverb lists the unit's weight at approximately 26 lbs (11.8 kg) with dimensions of 17-1/8" x 5-1/4" x 15".
Performance: Experts on Audio Science Review note it uses a "linear-transfer bias circuit" to virtually eliminate crossover distortion.

Specifications
Power output: 120 watts per channel into 8Ω (stereo)

Frequency response: 1Hz to 100kHz

Total harmonic distortion: 0.0005%

Damping factor: 200

Input sensitivity: 1.1V

Signal to noise ratio: 122dB

Dimensions: 435 x 380 x 133mm

Weight: 11.8kg

Year: 1982