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 Post subject: Loud hum when touching the metal
PostPosted: Jun Fri 07, 2019 6:28 pm 
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Joined: Sep Sat 08, 2018 7:11 pm
Posts: 66
Location: 63302
While working on my 7-EY-2HH it developed a hum that increased in intensity when I would touch the metal parts of the player. Having been in and out of it several times making adjustments I thought I had broken a shielded wire or one of the wires was touching something it shouldn't be. Checked the cartridge connections several times also. One of the last times I had it unplugged and re-plugged in the hum was gone. After checking more things I figured out that the plug was not marked for polarity and I could plug it in two different clockings. Bottom line is when I plugged it in observing polarity there is no hum. My thinking is the chassis ground (?) connects through the neutral wire of the plug and if i plug it in observing that there is no hum.. Is this a normal thing or is something mis-wired in the chassis? Thanks.


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 Post subject: Re: Loud hum when touching the metal
PostPosted: Jun Sat 08, 2019 4:53 am 
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Joined: Feb Wed 04, 2015 12:26 am
Posts: 940
just make sure the polarity is correct when plugged in. no hum=correct


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 Post subject: Re: Loud hum when touching the metal
PostPosted: Jun Sat 08, 2019 6:46 am 
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Joined: Aug Tue 24, 2010 8:56 pm
Posts: 5673
Location: Northeast Florida
With ac/dc amplifiers, this is common. As Arcturus said, just reverse the plug in the outlet

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William


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