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Rotel RX950 with humming noise
Rotel RX950 with humming noise
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Old 27th March 2007, 10:02 AM   #1
jorgens is offline jorgens  Norway
diyAudio Member
Join Date: Mar 2007
Default Rotel RX950 with humming noise


My dear old receiver just recently started to make a humming "background noise" (actually quite loud) it seems to me it must be something wrong in the power supply as the humming noise is 50Hz. Could it be the smoothing capacitors? If so - how do I localize them?
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Old 28th March 2007, 08:34 PM   #2
diyAudio Member
Join Date: Jan 2006
Location: central Iowa
Unplug the unit from the mains power source.Remove the cover . Look for 2 0r 4 large plastic coated aluminum cans,these would be the main power supply filter capacitors!Look them over real good usually when these go south they get hot and swell up or bulge out and start to leak a oily (electrolyte) substance.

Beware those same capacitors may still have a healthy charge on them..If you touch the terminals and chassis ground you may get a education!

Ret. USAF... AKA- Avionic *** Solder slinger for hire...***
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