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cr-640

  1. tutor_turtle

    CR-640 both meters stuck

    Digital volt meter shows proper signals are getting to the meters. With meters out, blowing lightly on the needles, they stick all over. 99% alcohol has not freed up the stickiness. Could be a victim of cigarette smoke. I have read all the past posts on this question, but no one has addressed...
    • tutor_turtle
    • Thread
    • cr-640 cr-840 malfunctioning meters signal meters stuck meters
    • Replies: 2
    • Forum: Yamaha
  2. potch

    Yamaha CR-640 Component Identification

    Hello, picked this unit up today and pulled the cover off to have a look. There are 2 square tubes protruding up from the board. One is loose and the 2nd one is not. They both seem to have corrosion around them. The loose one is circled in red in the attached picture. What is the function of...
    • potch
    • Thread
    • board components cr-640 yamaha
    • Replies: 6
    • Forum: Yamaha
  3. Shtig99

    CR-640 hum

    I recently got this at an estate sale for a small price. It plays but there's a high pitch humming that's present across all input selections. The humming is not made louder by adjusting any other knobs. But the pitch of the humming seems to modulate higher or lower when adjusting balance...
  4. EifX

    Yamaha CR-640

    Hi There, I have got on of these on the bench and my knowledge is not advanced enough to handle the behaviour of the amp. When I first tested the amp with dummy-loads and signal generator en scoop. I just saw noise the pots and switches. After cleaning the pot and switches I tested it again and...
    • EifX
    • Thread
    • cr-640 learing yamaha
    • Replies: 2
    • Forum: Yamaha
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