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Lux 60hz Hum

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

Posts: 1346
Location: Tempe, Arizona
Joined: November 13, 2003
 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.
Open up your mind, in pours the trash. - Meat Puppets, 1987

 

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

Posts: 121
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
GTCharlie
Audiophile

Posts: 983
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
siepi


 
Hi

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

regards

 

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