[78-L] Record Noises - Identify and Understand Cause

[david.diehl at hensteeth.com]

 >something I once heard): reverse the polarity onthe turntable motor and play the disc anticlockwise from the centre out,
I did this experiment several years ago. Not only was there no improvement, I couldn't even hear any differences. I had hoped that there would be at least a few places that could be substituted but-Nada.
DJD

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-----Original Message-----
From: Andrew Evans [mailto:andrew.evans at sfr.fr]
Sent: Monday, January 13, 2014 03:05 PM
To: 78-l at klickitat.78online.com
Subject: Re: [78-L] Record Noises - Identify and Understand Cause

DL wrote "Sometimes one side of the groove will be cleaner. "This reminds me of something I once heard but have never attempted: theplausible notion that centripetal force exerted on the stylus will causemore wear on the inside face of the groove than the outside.Solution (according to the something I once heard): reverse the polarity onthe turntable motor and play the disc anticlockwise from the centre out,using centrifugal force to get a good strong signal from the less-worn outerface of the groove. Then play the resulting tape or file backwards, ofcourse.Is there anything in this? Or is it just an urban legend?Andrew in LuxembourgMessage: 1Date: Mon, 13 Jan 2014 13:19:04 -0500From: David Lennick Subject: Re: [78-L] Record Noises - Identify and Understand CauseTo: 78-L Mail List <78-l at klickitat.78online.com>Message-ID: Content-Type: text/plain; charset="ISO-8859-1"; format=flowedSometimes one side of the groove will be cleaner. And this may vary from theoutside to the inside of the disc. Again, different styli may help, and ifonestylus gives me blasting and another gives me surface noise, I may opt forthesurface noise, unless I'm doing an unprocessed lift and the ultimateengineercan deal with the blasting as a series of clicks (even manually).dlOn 1/13/2014 1:13 PM, Doug Caldwell wrote:> is there any way to minimize the effects of "torn grooves" in transfer (or> playback) ? Weight, stylus size? (Other than getting a better copy)>> -----Original Message-----> From: 78-l-bounces at klickitat.78online.com> [mailto:78-l-bounces at klickitat.78online.com] On Behalf Of Dave Burnham> Sent: Monday, January 13, 2014 12:19 PM> To: 78-L Mail List> Subject: Re: [78-L] Record Noises - Identify and Understand Cause>> It is easy to see blasting on a record; blasting only occurs on loudpeaks,> (if we're talking about the same thing), and it appears as a grayish arc> superimposed on the loud groove. I've always called it torn groove and it> occurs when a large lateral excursion, (loud), is tracked repeatedly witha> needle or stylus with poor compliance. You'll often find blasting on> multiple copies of the same record. You'll rarely find a copy of Crosby's> 1935 "Adeste Fidelis", or the 1939 Aldershot "Last Post" or the Bourdon> "Jingle Bells Fantasy" without blasting on their last notes; however, the> D'Oyly Carte recording of "Yeomen of the Guard" has blasting throughout on> choral peaks which has no visible evidence because it was caused by sloppy> engineering, not groove damage.>> db>> Sent from my iPhone>>> On Jan 13, 2014, at 11:50 AM, "neechevoneeznayou at gmail.com">  wrote:>>>>> On 1/13/2014 10:24 AM, Doug Caldwell wrote:>>> is there any way to visually tell if a record has "blasting">>>> If you mean by the naked eye, I think so. If your vision is strong>> enough, you could look at the groove and see that it appears to be>> "wider", meaning it produces a wider lateral movement for the stylus>> on peaks. Easier to see when comparing a pristine copy to a worn copy.>> Also easier when your eyes are young. Otherwise, a strong magnifierhelps.>>>>>> And if you look at blasting on a graph, it's a ton of spikes (like a>>>> lotta ticks close together).>>>> If you mean on the computer screen, David has answered that. The sound>> produced may include high frequency artifacts that get more intense on>> peaks. I am not sure what David means by a "graph". Perhaps a spectral>> display? This is amplitude and frequency as a function of time. Makes>> everything visible.>>>> joe salerno_______________________________________________78-L mailing list78-L at klickitat.78online.comhttp://klickitat.78online.com/mailman/listinfo/78-l