Question about Sansui Audio Players & Recorders

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Hi, Experts, Vintage Sansui 5050 receiver. FM works well in mono but no stereo sound or stereo indicator. Replaced stereo decoder chip but did not fix the problem. Rest of receiver works OK (AM, AUX, phono.) Cheers, Roger

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  • analogdino Apr 08, 2013

    Problem solved! My very good tech friend found a transistor wrongly wired in the pre-amp. It looked factory fresh, so very odd... board may have been a prototype as there were other diferences from the schematic. Anyway, unit is now fixed and working well. Cheers, Roger

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Mono is ok ....phil spector

Posted on Jun 07, 2009

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Check for 19 Kz on stero decoder that requires calibration adjustment.
Instrument you need:
Occiloscope or frequezy counter and adj driver .
Good lock.

Posted on Jul 28, 2009

  • analogdino Apr 08, 2013

    Thanks, but not 19 KHz problem. See my comment above.

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Page 26:

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I have a 1977 sansui 7070 right channel only starts to work when balance is all the way to the right and 80% volume, channel works in mono any Ideas


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Keep us posted.

Dan

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