Yamaha M-70

Yamaha B-70

1 9 8 1 1981
1 9 8 4 1984

Part of the myriad of huge amplifiers Yamaha produced during the 1980s : well-built, powerful enough to almost drive a pair of Magnepans, looking in sync with the times (flashing red and black) and nearly indestructible.

Auto-Class A was for the later M-80 revision but the ZDR system was applied here as well as a fully DC circuit. ZDR (aka Zero Distortion Rule) is a way to re-inject the detected distortion signal but in phase-inverted mode.

The M-70 was a B-70 in Japan and a Stereo Sound "Best Product" there, alongwith the C-70.

The smaller M-50 was introduced alongside ; later replaced by the M-80 / M-60 / M-40 in 1984, all three with the added "Auto Class A" feature, somewhat bigger looks plus even more available power.

Yamaha M-70, image 1 Yamaha M-70, image 2 Yamaha M-70, image 3
Yamaha M-70 specifications
Title Value
20Hz...20Khz power : 2x 200W (8 Ohm, 0,002% THD)
2x 250W (4 Ohm, 0,002% THD)
Power bandwidth : 10Hz...100Khz (8 Ohm, 0,003% THD, 100W)
Frequency response : DC...100Khz (-0,5dB)
Damping factor : 200 (8 Ohm, 1Khz)
Inputs : 1,41V / 25kOhm (100W, 8 Ohm)
S/N ratio : 124dB (IHF-A)
1Khz stereo separation : 95dB
PC : ?
Dimensions : 43,5 x 13,3 x 38cm
Weight : 13,7kg.
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