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

[David Lennick]

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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