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Pioneer SA8500

G

GCas

New Member
Hi,

I have a Pioneer SA8500 (series 1) in very good condition. However, it has recently developed a problem. After playing it for a while, it starts making a loud crackling noise. I have cleaned all switches, including the power. The noise is not affected by the volume control or any other control 9except when I switch off the speakers, and even then, it still goes through the headphones. I have to think that it must be something beyond the pre-amplifier. I checked the power outlet connections (plug and socket), the plug seems fine, and when I connected it to another socket, it still does the same thing. Any idea what could be happening?

Thanks very much for your help.

George
 
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Sounds to me like you have an issue with a smaller signal transistor failling, the SA-8500 has quite a few known problem transistors in it.
 
I can't remember if the 8500 has those two-in-one transistors (2SA279 I think) but those are the usual culprits. I also had to replace those in my 8500II a few years back as one channel started crackling. Then it got so bad that it went into protection and wouldn't come out. I am listening to it this minute as I type.

These transistors are not in the preamp section but on the power amp boards.
 
Thanks very much for your replies. Will send it to my tech for a complete diagnosis and repair, since seems to be beyond my capabilities. Your replies will surely be of great help.

Much appreciated.

Regards
 
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