Hum in Kenwood KR-7050

clparrish

New Member
It has a 120 Hz hum on AUX ONLY. The other sources are dead quiet. Hum seems to be mostly on the left channel, although there's some on the right. I just replaced the electrolytics on the power supply board but it didn't stop the hum. It's there even with nothing connected to the AUX inputs. Any suggestions would be appreciated!
 
Try cleaning the source selector switch. It might just be corrosion on the contacts that affect that one channel.
 
Verify continuity in the grounding of the coax cables from the AUX inputs to the selector switches.
 
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