Re: [ARSCLIST] Audio equipment cable shielding

["joe@xxxxxxxxxxx" <sergei01@xxxxxxxxxxxxx>]

Another thought is that an old amp might be showing its age - as power
supply caps dry out, some 60 slips through. Temporarily substituting another
amp might be revealing. I remember when my old Advent Dolby Noise Reduction
encoder was dying, the hum was getting worse. I replaced some caps and it
helped but did not solve the problem completely.

js

----- Original Message ----- 
From: "Tom Fine" <tflists@xxxxxxxxxxxxxxxxxxx>
To: <ARSCLIST@xxxxxxxxxxxxxxxx>
Sent: Wednesday, April 19, 2006 6:22 PM
Subject: Re: [ARSCLIST] Audio equipment cable shielding


> Hi Kurt:
>
> My 2 cents. Better to put the preamp near to the turntable as is feasable.
Then there should be very
> little hum originating from there if the cartridge is hooked up and
working properly. Remember of
> course to connect the turntable's ground wire to the preamp. Some serious
vinyl-heads shorten their
> turntable cables but I've never found that necessary. However, as you
probably know, never a good
> idea to lengthen them for a variety of reasons.
>
> In my studio, the preamp is right next to the turntable, on an old oak
school desk (which sits on a
> carpeted cement slab/floor). Then there's about 15' of unbalanced cables
to the mixer which feeds
> the DAW. Very low noise floor results, far below dead-grooves in the
vinyl.
>
> One place you might find is a source of the hum is a computer sound card.
My experience has been
> that computers' "shield" is not necessarily green-wire ground. Unbalanced
computer soundcards have a
> certain noise level that's higher than external converters and balanced
internal cards, but it
> shouldn't be an audible/annoying hum.
>
> Have you tried disconnecting each stage of the chain to see where the hum
is started and/or centers?
>
> -- Tom Fine
>
> ----- Original Message ----- 
> From: "Kurt Nauck" <nauck@xxxxxxxxx>
> To: <ARSCLIST@xxxxxxxxxxxxxxxx>
> Sent: Wednesday, April 19, 2006 8:53 AM
> Subject: Re: [ARSCLIST] Audio equipment cable shielding
>
>
> > At 01:21 PM 4/18/2006, you wrote:
> >
> >>Kurt Nauck:
> >>
> >> > We are doing some re-arranging of our studio here at
> >> > the shop.  We're encountering hum from the audio
> >> > cables being in proximity of power cables and possibly
> >> > from florescent lighting (!)
> >>
> >>Are the audio cables balanced?
> >
> > No, unfortunately. If I use an rca to xlr cable converter, can I carry a
balanced signal from my
> > turntable to my preamp, or do I need a special device?
> >
> > Kurt & Diane Nauck
> >
> > c/o Nauck's Vintage Records
> > 22004 Sherrod Ln.
> > Spring, TX  77389
> >
> > Website: www.78rpm.com
> > E-Mail: nauck@xxxxxxxxx
> >
> > Phone: (281) 288-7826
> > Fax: (425) 930-6862
>
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