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Yamaha M-65

Stereo Power Amplifier (1986-88)

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Yamaha M-65


Power output: 170 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.002%

Damping factor: 130

Input sensitivity: 1.28V

Signal to noise ratio: 120dB

Dimensions: 435 x 165 x 425mm

Weight: 15kg

Year: 1986


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M-65 Repair Hint

Amps remains in protect mode, no output:

Check the corrosive glue around capacitors C157, C158 1000uF 80volts.
Leads of R141, R142 22ohms fusible may be cut by corrosion.
These have no designator on the board and are located near to the caps.

re: M-65

This M-65 power-amp. combined with the C-65 pre-amp is one of the best I've ever heard.
It sounds great,even with a cheaper pair of loudspeakers.
I'm still looking for the best match and played a lot off different brands and sizes.
If you ever get the chance to buy one of the M-series: Don't think twice!

P.s. Please reply for a loudspeaker suggestion.


Rating: 9 out of 10

re: M-65

I use the M-65 combined with a C-85 preamp to drive a set of (made in Germany) Magnat 5 and Magnat 10 with "all ribbon" flat-wound coils. These speakers can have a challenging impedance but the M-65 drives them with ease. Rock solid bass and certainly not boomy. Incredible high and low. Unbelievable dynamic because of the high velocity coils that do justice to a fast FET amp like Yamaha's M series. The Magnat 10 goes as deep as 22 Hz and no nuance goes unheard. They are great for blues/Jazz and rock. My friend who is a professional sound-engineer described them as "insanely natural" (Sorry Bruce; I won't sell them). If you love a more smoother approach; I also own 2 sets of Dahlquists (the 9 and smaller 9C), driven by another C-85/M-65 set in another room. Those Dahlquists have the same dimensions and Magnat drivers but are equipped with a more smooth filter making them perhaps better suited for Classical and jazz. It's a personal taste - as I prefer the Magnats above the Dahlquists but enjoy both sets regularly.
With all of the above mentioned speakers you can have Tjaikowsky's Overture 1812 give you a punch in the stomach, appreciate Marillion's afraid of sunlight to its fullest or imagine Nora Jones playing in front of you.
Magnat 9.5 out of 10.
Dahlquist 9 out of 10.

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