LP eccentricity, spindle hole center,The fix??????


Hi all,

I'm one of those audiophiles, 67 years of age, that wonders about the effect of the accuracy of the center hole. Some of the LPs I put on the TT have play due to a center hole that's punched out of round, too large or what ever.

I'm playing a record on a Denon 308 direct drive table using a system devised by a LJT Mfg in Canada to reduce eccentricity and help flatten warped records using a peripheral ring clamp in conjunction with a 1420 gram spindle clamp. The trio comes along with a cnc machined polycarbonate centering disc that straddles the record after the clamp ring is set registering on the outside diameter of the record. I can feel play regarding the center hole as I implement the OD centering device. I'll measure it tomorrow, just a few thousandths. The music sounds fine to my ears but I wonder what the relationship is to the record grooves, the outside diameter, and the center hole.

A while back a TT was made that had an extra arm that MEASURED THE ECCENTRICITY of the record and re centered the disc for play, it sells for big bucks if you can find one.

FINALLY, Your thoughts on the question?

regards, Ken Fritz
kftool
Dear Jlin, you are right - very often the two sides do differ in their eccentricity. In that case the "alignment" has to be done for each side individual.
Dear Dertonarm: Where we can find those standards on the subject?

Now, the " perfect center hole " standard when is achieved give all of us an immediate quality improvement, it does not matters which analog system we own.

is there a " road " for the recording industry can fulfil with that standard? who is the institution that have to control that that standard be fulfil/realize by the LP manufacturers? how anyone could " force/compel " to the LP manufacturers to do it?

We are paying a lot of money for new LP's that are really bad/wrong in its overall quality.
I don't know others but I'm willing to pay an extra " fee " for that " perfect center hole " standard, no doubt about: that makes a difference for the better.

We all here are commited to improve the quality perfomance in our home systems but I can see that for many of us that is not really a priority because in more than one ocasion I bring this subject with receive almost no " eco " to make and take actions about.

I consider you a serious man on this and other subjects why don't start ( you and me ) or take some actions about, let me know IMHO we need to do it like a " group ", this is not a " fight/war " for one person.
What do you think? or you think it will be " futile " ( like you say. )

+++++ " is such a small segment of the audio/video market, that this (we...) and its (our..) needs are of no interest at all for the industry. " +++++

well, remember that we ( the customers ) are part of the industry and not only that but that industry " lives " thank's to us not to them.

regards and enjoy the music.
Raul.
Dear Raul, I agree. But the only part of the market we have SOME buying power is the specialised audiophile LP market. And even here - take the infamous Classic Records 200gr issues which were certainly plagued with pressing faults and warped samples - even with LPs which do ask some serious retail prices, we seldom get the excellent and careful pressing quality we ask for and deserve to get for our money.
I am collecting LPs since the early 1980ies.
There always were certain companies showing great care in what they released - excellent quality control. JVC Japan, King Records, for a long time DECCA and EMI (at least in their classical department...).
Today maybe we could put some "pressure" for quality on Classic Records, Speaker Corners etc.

You are right - we should try.
We all.
A small group is not enough.
We would need something (something like...) like the international boycott movement which eventually helped overcome apartheid in South Africa in the 1980ies/early 1990ies. That was a display of positive buyer's power (at least here in Europe).

I think the best way would be if Classic Records and all other audiophile record companies would just start having all their LPs pressed at JVC / Japan.
That would solve all our headaches.
I am in.
Dear raul, I don't know whether the old Microgroove Longplaying Record standards can be found anywhere on the web (but I believe so). I have them in the old printed papers of AE Anthology and Wireless World.
Dertonarm: Ok, good that you are of that kind of people that like " live its life " ( make things happen. ) and not only see how its life goes through.

Please email me to start about. All of you auio and music lovers friends ( elsewhere you are ) are invited too.

Regards and enjoy the music.
Raul.