2. analog
  3. 157961-1975

I finally get it!

I had a long  discourse with VPI after I bought my new Classic 3 Sig SE years ago. The subject was that the S2P distance was off. After over one year of trying to get this resolved, I still received my tt back with this distance 1 mm (long).

I always wondered why there was no forthcoming measurement of the S2P distance. After all, VPI is know to have customers DIY their own tts, based on VPI's own products.

So, VPI offers their set-up jig with new tts. They don't offer any specific measurements for S2P. Someone had to ask on their forums in order to find out. Why?

I now know why. Because, their manufacturing was/is not very precise. So, if their S2P distance was off when the tt left their shop, their own jig (provided) would still keep the S2P distance in a (good enough) range. 

Nice try/trick.
slaw
slaw's avatar
slaw OP
23,972 posts
 
oldears
386 posts
 
@phoenixengnr From the table on the turntablebasics website,for a 230 mm EL the optimum OH is 18.14, and the angle is 24.083 deg:for a 229 mm EL the optimum OH is 18,05 and the angle is 23.972 deg.This kind of difference is hard to measure, thus not a drama.
 

The 1 mm error in 230 mm is 0.4%. I can't name manufacturers, but I recall both Fremer and Dudley mentioning this kind of error more than once.

Please read the references.
stringreen's avatar
stringreen
6,531 posts
 
I have a MINT alignment tool which is exacting like VPI's.....
boxer12
8,656 posts
 
IME that is a serious oversite. High end analog is not at all forgiving to issues like this. Glad you got it worked out Slaw. 
optimize
164 posts
 
Maybe I am naive or maybe someone could explain to me what the SONIC difference is between -1mm and +1mm S2P difference?

If there is enough space/play in length of the slotted head shell cart mount hole.
So you are able to get desired overhang and hit you preferred alignment type.

Then there should not be any SONICALLY difference between those two S2P distances.

It only become a problem if you can not reach the desired points for your arch protractor/overhang. So as I see it the slotted holes in the head shell allows some tolerance in pivot to spindle distance.

And we then fine tune it IF we use a ARC protractor that fix the overhang!

But yes you loose out if you use a tool that set the overhang by other suboptimal techniques.

As everyone understands now that a arc protractor has yet here another benefit when it adjust the overhang and in the process fixes any intolerances that just that specific TT and tonarm combination has! 

Every TT has a unique S2P distance because of their is always a slight mounting tolerance of ± X.XX mm. 

So please use a arc protractor and this P2S issue is not any issue anymore if you can adjust in the slotted holes in the head shell..
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