AudioCircle
Other Stuff => Archived Manufacturer Circles => Hagerman Technology => Topic started by: G E on 28 Jun 2015, 04:31 pm
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Hello,
I have enjoyed my Cornet 2 for a couple years now and it has been very quiet regarding hum and noise.
Friday night I noticed a 60 hz hum out of both channels, the right slightly louder. It isn't real loud but it is noticeable with no music playing.
I have several sets of tubes and swapped them in, including another Bendix 6106, but the hum remained.
When I turn off the Cornet 2, the downstream electronics are dead quiet, same situation when I select another input on my preamp. Unplugging the turntable power supply has no effect.
Any ideas?
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Check your cables. Often times a broken shield can do this. Also check ground continuity to all metal parts of the chassis.
jh
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The hum is gone. I disconnect all power cables during severe thunderstorms and when I plugged them back in I may not have got them all back in their previous positions. Ground loop induced hum perhaps.
Any way, I rerouted some power cables and ICs I also installed a 3" maple platform under my turntable and positioned the cornet 2 180 degrees from original position.
The hum is gone but I can't say with certainty what action was responsible.
The important part is acknowledging the response from Jim Hagerman.
Thank you for taking time to offer help.