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Yamaha M70 Ampmcoz
Dec 28, 2001 6:35 PM
Can anybody shed some light on a Yamaha M-70 amplifier? Watts per channel? Years manufactured? Approximate value? Any information would be appreciated.
re: Yamaha M-70 amplifierDougman
Dec 28, 2001 11:22 PM
Around 200 watts/ch, at THD of 0.003% or lower

These were made around 1985-1988. In good shape, completely working, they go for around $250-300 on eBay. I recently bought it's "little" brother, an M-40 (120 W/ch, otherwise very similar) for around $150 on eBay.

Best feature is that they will run in Class-A mode unless the continuous power requirement exceeds 25 Watts per channel, (10 W in the M-40) then they autoswitch to class AB. I can't say how the switching sounds, because I don't think I've ever driven mine at continuous levels above the switching threshhold. What I can say is that at continuous levels below 10 Watts in class A mode, my M-40 has no problem with 150-200W transients, and it sounds superb.

These are extremely fine amplifiers for the money, IMHO. Rock stable at lower impedances down to 2 Ohms as well.
 


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