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Pioneer a858 amp no sound from phono stage, I bought it from ebay and dont know whether someones connected a line level component to it such as a cd player. and if they had would it kill the phono stage dead. all the other inputs are working fine

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  • Big John H Nov 10, 2008

    Thanks Problem fixed :)
    John H


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Hi Big John

This is a nice reference series amp with a decent phono preamp stage. It is unusual to see a phono stage get damaged in this way.... but Murphy's law tells us "If it can be blown up, then someone will do it". I recommend that you do fix it. First up, perhaps check the settings for the preamp on the rear of the amp(from recollection). Be sure that you have it in moving magnet (mm) mode if you are using a MM cartridge.

Although its been a few years, My recollection is that there is a separate power supply for the phono preamp, with maybe even power regulators on on the actual preamp board. First check would be here to see if both DC rails are present for the phono Preamp stages. Most common failure here is heat stressed cracked/dry solder joints.

You need a good HiFi/Audio tech to have a look at it for you if the problems run deeper than DC supply for the preamp. Good luck. A FixYa rating is a great reward for my time to address your problem. Cheers

regards
robotek

Posted on Nov 07, 2008

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