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About the M-70
The Yamaha M-70 Natural Sound Stereo Power Amplifier is a premium power amplifier from 1982-1984 that combines outstanding low-distortion power performance with incredible power efficiency. It features Yamaha's proprietary Zero Distortion Rule (ZDR) system, Linear Transfer Bias circuitry, and the "X" Power Amplifier system to minimize crossover distortion and heat generation. The ZDR circuit uses a distortion detector and summing circuit to monitor output and feed back a 180° out-of-phase distortion signal to cancel virtually all distortion, even accounting for back EMF from speakers. The amplifier delivers clean, accurate music reproduction with negligible crossover distortion levels and operates under optimum conditions at all times.
Specifications
Key Specifications
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