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

[David Lennick]

Not an urban legend..EMI did quite a few transfers that way in the 70s or 80s. 
My method of dealing with uneven groove wear is to mix a stereo feed but start 
with the left channel open, cross fade gradually and end up with the right 
channel by the end of the side.

dl

On 1/13/2014 4:05 PM, Andrew Evans wrote:
> 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>
> Message-ID:<BLU0-SMTP83FFCAD9C4CB8DBC287B25BDBC0 at phx.gbl>
> Content-Type: text/plain; charset="ISO-8859-1"; format=flowed
>
> 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
>
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