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Sansui AU 3900 vintage 1974

I have a sansui AU 3900 it has been in my closet for lets just say untold years because I took it to several sound stores and was told they didn't have the schematics for it and I was probably out of luck.
The problem I am having is when I turn the power on within a few seconds the amp shuts it self down.

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  • pre1mech Feb 28, 2008

    To petraman7,

    your help is much appreacated this is much better than some one telling me that I had no better option than to thow it away and bye one of their new ones,(I am kind of attached to this one after 30 some odd years).

    thanks much,




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Porfavor dar las referencia de los trancitores tipo moneda que tiene el sansui au3900

Posted on May 25, 2011

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I Changed all capacitors on stage power board except two 3300µF 35V.

Posted on Aug 10, 2009

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Try rick at
The shutdown would be from a voltage supply in the power amp seeing too heavy a load and "shutting down" so that the amp doesnt Fry

Posted on Feb 28, 2008

  • Scott Frye
    Scott Frye Feb 28, 2008

    you're welcome!
    It just so happens that I'm picking up an OLD sansui this pm
    a 1000A tube receiver . I'll refurb the thing. It should sound awesome


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