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Yamaha CR-420

AM/FM Stereo Receiver (1978-79)

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Yamaha CR-420


Enjoying novel and useful features, the CR-420 receiver combines super broadcast reception with the finest audio quality, and is currently setting new standards for receiver performance in it's class.

The unit features accurately matched performance specifications, functions and controls, fully measuring up to Yamaha's high standards for separate tuners, pre and power amplifiers.

The CR-420 offers an extremely wide range of output powers for which both noise and distortion are below the rated value, for the widest possible dynamic range in actual use.

The sophisticated differential gain technique enables the Yamaha to combine high station-getting ability, razor sharp tuning, and ultra-low distortion in the tuner section.


Tuning range: FM, MW

Power output: 22 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.05%

Damping factor: 40

Input sensitivity: 2mV (MM), 120mV (line)

Signal to noise ratio: 91dB (MM), 97dB (line)

Output: 120mV (line)

Speaker load impedance: 4Ω (minimum)

Semiconductors: 2 x IC, 1 x FET, 53 x transistors, 25 x diodes, 5 x zener diodes, 3 x LED

Dimensions: 451 x 161 x 324mm

Weight: 9kg


schematics   English -

instruction/owners manual   English -

420/420BL service manual   English - fmmech

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re: CR-420

I must be the only one that has SOOOO many problems re-stringing the dial! What an utter mess! Aaaaargh!

re: CR-420

Need help to figure this out. Just picked up this receiver and 2 ceramic resistors heat up to the point of turning red if i turn it on. They are in the board between the power supply and the front of the unit next to the heat sink but I'm not sure if I can locate them in the squematic Any suggestions?

re: CR-420

My CR-420 is my favorite receiver. Rock solid and plenty of power, currently driving my equally beloved A/D/S L520s. Very clean sound, good tuner, although I don't use that mode very often. I hope this one is with me for a long time!

re: CR-420 AWESOME sounding, in comparison to classics.

This is a truely spectacular sounding unit, for a solid state stock receiver.
I mod gear , have made over 1000 high end tube amps, still in service, etc etc.

I was testing a number of vintage era hi fi recieivers, and amps, and the YAMAHA was a DISTINCT STANDOUT compared to Marantz, Sansui, Dynaco, Quad, Radford, Harmon Kardon and others.

I was quite surprised at the order of magnitude clarity differance from what i had been hearing all day.
i guess the giant 2000+ UF output couplers on most of the older designs arent doing them any favours.


Yamaha CR-450

Anyone know if CR-420 is related to the CR-450 as far as schematics go ???

Cr-420 Cr-450


Do both of them have similar front panels and controls?

If so I think the diff would be the STK amp module or larger output transistors

This website is not affiliated with or sponsored by Yamaha. To purchase CR-420 spares or accessories, please contact the company via their website or visit an authorised retailer.