Yamaha CR-840

Yamaha CR-840

This ebony classic is the Yamaha CR-840 receiver. It was produced from 1979 to around 1981 and retailed for about $500. It was a mid range receiver in Yamaha’s CR-XX40 lineup. It puts out 60 watts per channel into 8 ohms.

Yamaha CR-840 Left

The CR-840 has the big flat toggle switches as do many of the other Yamaha models. Overall it has a very nice sleek hi-tech look to it, though some think the Yamaha models look somewhat sterile.

Yamaha CR-840 Right

The CR-840 has a built-in AUTO-DX circuit that monitors the signal strength and amount of interference present.  If needed it will automatically switch to the DX Mode IF Stage to increase the selectivity to 83dB.

Yamaha CR-840 Meters

It also has continuously variable loudness control which means that the frequency balance and volume are adjusted simultaneously to compensate for the ear’s insensitivity to high and low frequencies at low volume settings. So, a natural-sounding balance is maintained regardless of volume level. It weighs about 30 pounds and measures 20″ x 6-9/16″ x 15-1/4″.

Yamaha CR-840 Inside

One problem with the Yamaha CR-840 is that it uses output modules rather than discrete output transistors. These modules have a tendency to overheat and die. Unfortunately, original replacements are difficult to find and newly made versions tend to be out of spec and perform erratically. It has been speculated that the Yamaha IG 02970 output module was in fact a rebadged Sanyo STK 0060-II or STK-0080-II. The STK-0080-II is fairly easy to find which would make repairing these units far easier.

Yamaha CR-840 Back

The Yamaha receivers have never garnered as much attention as the Pioneer and Marantz receivers but perform just as well.  They do emphasize a “Natural Sound” so they tend to have a more accurate representation of sound which some find to be a little harsh. Prices are rising for these receivers though – especially the higher end models.

Available on Ebay

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8 thoughts on “Yamaha CR-840

  1. Nice website! Informative and convenient.
    I have acquired a nice, clean Yamaha CR-840 which I hope to clean and change the bulbs before long.
    But I have noticed there is no clear lens or glass in front of the AM/FM dial. Surely there was one, yes?

  2. I recently purchased a CR840 in mint condition the fellow I bought it
    from had it since new he had it cleaned and checked over prior to sale
    The only issue is the backlight for the tuner display is out which I’m not sure if the signal meter shares the same light is that an easy fix?

  3. Love this receiver! Found mine in the junk bin at the local Goodwill. Cleaned it up and perfect sound! Great find for $30. Your page is spot on, thanks!

  4. Which is the correct replacement for the Yamaha IG 02970 output module in my Yamaha CR-840? Is it the Sanyo STK 0060-II or STK-0080-II? Or would either work? Also…could this be my problem that is causing my CR-840 to not click in the relay and have any outputs?

    Thank you in advance for your help.

    1. Hi, I would try the guys in the Yamaha forum at audiokarma.org. There are a number of techs over there that should be able to give you a definitive answer. The forum is HERE.

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