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Re: AU-7900 bad phono preamp

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Posted by Sten on December 16, 2004 at 14:09:47:

In Reply to: AU-7900 bad phono preamp posted by Greg on December 16, 2004 at 12:40:44:

Hi Greg
A much costless way is to buy a De-Oxid Spray and clean the selector switch. You can thereafter clean all other selector and mode switches (donīt forget pre/main switch at the rear) and you will probably get a new sounding amplifier. I tell you this because itīs very common that older electronic connectors are collecting oxide. If it doesnīt help with cleaning check cold soldering on phono board.

: I have determined that the phono preamp of my beloved AU-7900 is dying, it will power up OK, produce good sound for a few minutes, then the right channel will come in and out. I am considering purchasing a TCC (750 or 740) as a stand-alone phono preamp rather than taking the amp in....any thoughts?
: I have dissassemble the amp to look for the obvious (loose connections etc) but was not able to find!

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