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Old 26th July 2007, 10:53 AM   #1
diyAudio Member
Join Date: May 2002
Default Help With Pioneer SA-9800 Please

With no sources connected I have a fairly loud hum on both channels which does not change with volume setting. Occasionally there is also a hiccup/thump on both channels whether source connected or not. Apart from this the amp sounds fantastic and plays perfectly. The sound recovers immediatly after the interruption. With the pre/power amps links removed there is no thump and very little hum.

Grateful for any advice please.
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Old 26th July 2007, 02:24 PM   #2
r221b is offline r221b  United States
diyAudio Member
Join Date: Jul 2007
It sounds to me like a bad solder connection somewhere. If removing the pre/power links "fixes" the hum/thump issue, then it's most likely in the preamp section, after the volume control. I'd try wiggling the components, especially capacitors, and see if anything changes there. Could also be the filter caps in the power supply going south.... You shouldn't really hear any hum. If you turn off the speakers and use headphones, are the symptoms the same? If it sounds OK on 'phones, then the filter caps are a good bet.

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