STP distance. Is it critical ?

Dear Bill: Now that I read both of your posts I think we are talking almost the same.

All those different set of equations were made to optimize/put at minimum the tracking error somewhere but to bring at minimum the tracking error means that we have to choose in what part of the LP recorded surface grooves we want to do it because we can't do it all over the recording LP surface.
So always is a trade-off choice.

The interesting for me in this whole subject is that in almost any pivot tonearm we can change those equations parameters and with the same cartridge see what happen and what works better in the audio system.

Now, IMHO for we can heard/hear differences in quality performance due to this geometry changes it is a must that in each time we test it the cartridge/tonearm set up were made almost perfect.
The analog medium is so imperfect that in this subject we have to be " perfect " to achieve a valued information.

Regards and enjoy the music,
Raul.

Dear Bill, Not so sure if the math. is so sure (see fundations). Enyway the math is not subjective. But we all
are trying to get the stylus on those null points. But if
we use,say,SME V with holes and not slots how are we (pre)
supposed to get there without changing the SPD? Ie I assume that eff.lenght is pivot- stylus distance.

Regards,

Hi Raul,

I think the point you were trying to make earlier that a designer didn't need to consider the spindle-to-pivot distance was what caught my eye. If you intended to mean otherwise, then we are in agreement. All pivoted arms have some degree of tracking error. It's just the nature of the beast.

Wouldn't it be nice if all tonearms were linear tracking to match the cutting process?

Bill

Nandric,

That's a good point regarding the SME V.

It would be nice to get some insight on the geometry model from the SME designer(s).

Bill

Dear Bill, J. Carr proposed 'éasy way' out for the SME V:
recalculate the geometry (thread reg. SME V?).
My (other) question. According to SAEC engeneers the balance in all 3 dimensions across the radius is of much
importance. Can you explain this claim?

Regards,