Yamaha M-70
Little is documented about the Yamaha M-70. What the record shows: it is a power amplifier from the early 1980s, delivering over 200 watts per channel into 8-ohm loads. Audio (January 1984, p.93-95) tested the M-70 and found it met virtually all of its specifications, with excellent transient response and very good bass reproduction - no muddiness or overhang. The review praised the amp's "tight sound," though the writer noted this impression may have had nothing to do with Yamaha's proprietary circuit names (Zero Distortion Rule, X power supply, X amplifier design).
Known specifications from period review:
- Power output: in excess of 200 W/ch into 8 ohms
- Circuit features: Zero Distortion Rule (ZDR), X power supply, X amplifier design
- Measured performance: excellent transient response, clean bass
Production years, original price, dimensions, weight, and further circuit details are not documented in the available record.
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