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

[Andrew Evans]

DL wrote "Sometimes one side of the groove will be cleaner. "

This reminds me of something I once heard but have never attempted: the
plausible notion that centripetal force exerted on the stylus will cause
more wear on the inside face of the groove than the outside.

Solution (according to the something I  once heard): reverse the polarity on
the turntable motor and play the disc anticlockwise from the centre out,
using centrifugal force to get a good strong signal from the less-worn outer
face of the groove. Then play the resulting tape or file backwards, of
course.

Is there anything in this? Or is it just an urban legend?

Andrew in Luxembourg




Message: 1
Date: Mon, 13 Jan 2014 13:19:04 -0500
From: David Lennick <dlennick at sympatico.ca>
Subject: Re: [78-L] Record Noises - Identify and Understand Cause
To: 78-L Mail List <78-l at klickitat.78online.com>
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Sometimes one side of the groove will be cleaner. And this may vary from the
outside to the inside of the disc. Again, different styli may help, and if
one
stylus gives me blasting and another gives me surface noise, I may opt for
the
surface noise, unless I'm doing an unprocessed lift and the ultimate
engineer
can deal with the blasting as a series of clicks (even manually).

dl

On 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 loud
peaks,
> (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 with
a
> 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"
> <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 magnifier
helps.
>>
>>>> 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