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.
128x128slaw
phoenixengr's avatar
phoenixengr
92 posts
 
A 1mm error in effective length implies a 0.1mm difference in overhang and a 0.1 deg difference in cartridge alignment. This should not be a drama. Read the articles.


@olddears

Where are you coming up with your numbers? A 1 mm difference in effective length (or S2P distance) will create a 1 mm difference in overhang and 0.87° tracking error at the null points and 1.47° tracking error between the nulls. Not huge, but an order of magnitude higher than you are quoting and completely unnecessary.

What other mfrs are as sloppy about this as VPI?
slaw's avatar
slaw OP
21,258 posts
 
@oldears,

Drama? That's your term, out of nowhere.
slaw's avatar
slaw OP
21,258 posts
 
@bdp24 ,

I hear you brother 

I became a believer years ago, when I first made a wire loom for my ET arm. It was a revalation.
slaw's avatar
slaw OP
21,258 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.
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