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Lux 60hz Hum

Posted on December 10, 2011 at 03:50:29

Posts: 934
Location: Tempe, Arizona
Joined: November 13, 2003
June 2, 2016
A 60hz hum, both channels, shorting plugs on the inputs, speakers connected. So not an external ground loop. The strange thing is that it varies in intensity. Some days not there at all. When it's there, always both channels, equal intensity. Can anyone give me some clues as to where to look other than starting at the inputs and scoping through, stage by stage or looking at the various DC supply waveforms? My current speakers are 96db efficiency so I can kind of live with it but I'm building a pair that will be around 100db and am afraid it will be really loud.


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RE: Lux 60hz Hum, posted on December 19, 2011 at 23:59:25

Posts: 117
Location: Lisbon
Joined: November 12, 2004
Broken solder joint somewhere. Check all the joints. It can be a smaller problem then you think.


RE: Lux 60hz Hum, posted on January 6, 2012 at 00:08:23

Posts: 976
Location: Philippines
Joined: December 9, 2004
since it's on both channels, that could come only from something common to both... most likely the power supply.

60Hz? that's the frequency of unrectified AC. Ripple would be at around 120Hz.


RE: Lux 60hz Hum, posted on May 4, 2013 at 08:01:43


does anybody have schematics for the FCUPS power supply ?
did you get your hum problems diagnosed and solved ?



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