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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,

    pre1mech

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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.

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Try rick at stereomanuals.com
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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