Question about Pioneer VSX-D457 Receiver

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My Pioneer SX-780 Receiver has very low volume and distorted. Are the output IC Amps bad? They use (2) STK-0050

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  • coopdakilla Apr 07, 2011

    This is a vintage receiver from the 70's, there is no test tone funtions. Same problem from every source. When the volume knob is all the way down, there is a prominent hiss. As you turn up the volume the hiss goes away. Volume is very low and distorted. I found the schematic, if needed.

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  • Master
  • 8,546 Answers

A little more triage would be in order before you take a knife to it. What source(s) produce the distorted sound? How about test tones? Same? It's sick. Not same? Something else is going on. Have you referred to the manual(s)?

Posted on Apr 07, 2011

  • David Dunn
    David Dunn Apr 07, 2011

    Ok how about FM andany other external source except PHONO then? BOTH the same result?

    I can't dive down into the diagram with you on this but I still think we need to eliminate the high level problems like operator error, switch positions and such before surgery.

    Did it EVER work for you?

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