[78-L] 78-L Digest, Vol 64, Issue 17

[Cary Ginell]

Yes - I have one on mine, although I haven't used the reverse motor very much - occasional it helps clear a hunk of dust, Strontium 90, or whatever obstacle is blocking a groove. Other than tryng to find clues to Paul's death on Beatles records, it's not something I use all the time.

Cary Ginell

On Jan 14, 2014, at 5:08 PM, David Lennick <dlennick at sympatico.ca> wrote:

> Doesn't Numark make a turntable that goes both ways?
> 
> dl
> 
> On 1/14/2014 7:12 PM, Doug Pomeroy wrote:
>> To play a record in reverse, you need, as was noted, to reorient the
>> arm and to re-mount the cartridge (this is not easy).
>> 
>> I agree it is the skating force, which causes a normally mounted cartridge
>> to wear the left groove wall (the one on the spindle side) more than the right
>> groove wall.
>> 
>> But I think this is only true when the disc in played in the conventional way,
>> from outside to inside, and if such a disc is played backwards, the tone
>> arm moves from inside to the outside, and I believe in this case the skating
>> force is impressed upon the opposite groove wall (the right one).
>> 
>> I experimented, years ago, with playing worn discs backwards, thinking
>> that this would to some extent avoid the longitudinal groove damage
>> caused on a disc which had been played over and over again in the same
>> direction. Reverse playing allows the stylus to track the groove modulation
>> from "behind" an area of damage rather than from "in front" of it, and I had
>> hoped this might reveal a less damaged section of the groove. However,
>> I found, as have others, that reverse playing offered no improvement.
>> 
>> Doug Pomeroy
>> Audio Restoration and Mastering Services
>> 193 Baltic St
>> Brooklyn, NY  11201-6173
>> (718) 855-2650
>> audiofixer at verizon.net
>> 
>> 
>> 
>> On Jan 14, 2014, at 3:00 PM, 78-l-request at klickitat.78online.com wrote:
>> 
>>> Message: 1
>>> Date: Tue, 14 Jan 2014 14:05:55 +0000
>>> From: Don Cox<doncox at enterprise.net>
>>> Subject: Re: [78-L] Record Noises - Identify and Understand Cause
>>> To: 78-l at klickitat.78online.com
>>> Message-ID:<yam13162.2775.76990520 at smtp.ntlworld.com>
>>> Content-Type: text/plain
>>> 
>>> On 13/01/2014, DAVID BURNHAM wrote:
>>> 
>>>> No there is nothing in this, I don't even think it's an urban legend.
>>>> 
>>>> I see there are so many answers to this so I'm sorry if I repeat
>>>> something that has already been said. Centrifugal or centripetal
>>>> forces don't really enter into it, since the cartridge/stylus assembly
>>>> isn't spinning. Playing the record backwards shouldn't offer any
>>>> solution to the noise because the noise is already there, (and if you
>>>> have a turntable that does allow playing the record backwards, make
>>>> sure you rotate the arm across the centre spindle so that the record
>>>> isn't pushing against the stylus). The spindle side of the groove may
>>>> get more wear because of skating forces which weren't really
>>>> addressed, in my experience, until the Dual Changers of the mid to
>>>> late '60s. These forces would push the stylus against the inner groove
>>>> wall, no matter which direction the record is spinning. My preamp does
>>>> allow playing back just one side of the groove so I know this method
>>>> works on some records, but rarely if ever have I found that it has any
>>>> effect on blasting. Once again, I believe that blasting is caused by
>>>> the poor compliance of the styli with which records were commonly
>>>> played before the LP era.
>>>> 
>>> It also occurs on LPs played on cheap early LP players with low
>>> compliance cartridges.
>>> 
>>> Regards
>>> --
>>> Don Cox
>>> doncox at enterprise.net
>> 
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