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Yamaha CR-640

Natural Sound AM/FM Receiver (1979-81)

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Yamaha CR-640


The Yamaha CR-640 is designed for easy operation.

Note, for instance, its clean three-tiered front panel design; the tuner scales, frequently used important switches and controls, and all other auxiliary devices are arranged on three different eye levels, so you can concentrate on enjoying music instead of fussing with controls and switches every time.

A number of unique features also add to easy operation, such as the Rec Out Selector for instance, which lets you choose any program source to record into your connected tape deck, while you listen to any other source.

FM/AM tuning is also made exceptionally easier in the CR-640, but reception quality is first-rate all the way.

As you would expect of a quality hi-fi component, the CR-640 comes in a beautifully crafted, sturdy wooden cabinet to blend with any decor.

It is finished in handsome, simulated ebony veneer, and matches Yamaha's other fine stereo components.

The CR-640 assures you of quality FM reception, regardless of the signal condition.

The built-in AUTO-DX circuit detects the signal strength and the amount of interference present, and, if necessary, automatically chooses the DX Mode IF Stage to increase the selectivity to 83dB.

Weak signals from a distant station are rid of all interference and clearly reproduced, and whenever the DX Mode IF Stage is in operation, the built-in Auto Blend Circuit is also automatically activated to enhance the high frequency signal-to-noise ratio.

On the other hand, if the signal strength is sufficient and there is little interference, the LOCAL Mode IF Stage is chosen to hold distortion very low for outstanding hi-fi tonal quality.


Tuning range: FM, MW

Power output: 40 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.02%

Damping factor: 40

Input sensitivity: 2.5mV (MM), 120mV (line)

Signal to noise ratio: 78dB (MM), 86dB (line)

Output: 120mV (line)

Speaker load impedance: 4Ω (minimum)

Semiconductors: 9 x IC, 1 x FET, 43 x transistors, 12 x diodes, 3 x zener diodes, 6 x LED

Dimensions: 510 x 167 x 385.5mm

Weight: 12.6kg


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re: CR-640

Anybody have a Yamaha CR-640 that you could photograph inside to give me a sense of how to repair the dial tuning cord? Mine has just broken. :(

re: CR-640

Let me know if you still want this info. I will open my 640 and take some shots if you need it.

re: CR-640

you can download the manual here on this site I see

re: CR-640


Sorry, I don't have a photo to share Have you taken a look at the service manual for the CR-640? Page 4 has a very good diagram of how the dial string is configured. It also has the length of cord that is needed.

If you still want a picture, sometimes ebay sellers will post interior photos of the items they are selling.


re: CR-640

thank you so much for this. I would like to up load some pic of my yamaha as i refurbish it if thats ok.

YAMAHA, CR-640 Receiver

Thaks, it's very useful

Thanks for the Manual on the CR-640

I'm just getting into vintage hi-fi, and do so much appreciate the information contained here. Thanks for all the folks that have contributed to such a cool website.

Mark DeCou

This website is not affiliated with or sponsored by Yamaha. To purchase CR-640 spares or accessories, please contact the company via their website or visit an authorised retailer.