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I have a vintage Sansui qrx5500, everything lights up, the meters show that the preamp is processing a signal but there is no sound, not even through headphones

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  • John Warren Jan 15, 2013

    I've checked all the fuses, have the unit apart at this time and see nothing visually that appears to be the problem. Evidently, these used fused transistors that would fail over the years. The preamp section appears to function but the relay isn't pulling in to activate the amp board.

  • John Warren Jan 15, 2013

    Scratch that, I meant fused "resistors", not "transistors. I think it's time to take a break from the thing!

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The problem is something to do with the power amp board. You need to determine if it is going power to it, from the power supply section. If it is it would indicate the main power amp has gone. Does it have an IC power amp? If it does then it's gone! Otherwise I am puzzzelled why both channels are down on a device with two seperate transistors stages.

Posted on Jan 16, 2013

  • John Warren Jan 17, 2013

    I've determined that the relay that must "click" on is not functioning as it should. I believe from what I have read about this particular quadraphonic receiver, is failure of the fused resistors. These units were built in the early seventies. What was used at the time as a early "protection" circuit for the amp, weakens over time. What I am trying to find is a decent detailed schematic, or picture of the board , with detail as to shich resistors need replaced with a metal film type of the same value. Audiokarma has several listings in their Sansui section, but no pics of the qrx5500.

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Posted on Jan 02, 2017

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SOURCE: Sansui QS-100 Problem with one rear channel

There are 2 250v 4a fuses inside the amp. They can blow and
that channel will cut out. Check the fuses.

Posted on Dec 03, 2009

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