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cd-4 demodulator

  1. L

    JVC 4VR-5456X repair of Phnono stage/CD-4 circuit gone wrong, 2SC458

    Hello everyone, Anyone here with JVC CD-4 circuit experience? I've gotten a quad amp from a friend - Its a JVC 4VR-5456X - and once cleaned up, it it in beautiful condition. I have cleaned out all the pots and contacts with Kontakt 60 -> Kontakt WL -> Kontakt 61 by the book and everything seem...
    • Loddestuen
    • Thread
    • 2sc458 4vr-5456x cd-4 demodulator cd-4 phono stage
    • Replies: 0
    • Forum: DIY
  2. tabpat

    I need help with a QRX-7001 demodulator

    OK, I've been poking around with this thing for a couple weeks now. The demodulator has never worked since I've owned it. It would show a CD-4 beacon properly, but there was no separation front to back and it had a noticeable whistle when a carrier was detected. I pulled out both boards and...
  3. tabpat

    QRX-7001 Demodulator board W. T. actual F?

    I am working on my Sansui QRX-7001. One of the issues that its had for longer than I've owned it (around 20 years) is the CD-4 demodulator has never worked. The phono stage is OK, but it's never properly demodulated CD-4 albums. I can't remember if the light comes on or not, but it's been a...
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