Antinn, another great old article. I can only calculate the PSI the vinyl is subjected to under static conditions which I probably should have mentioned. Playing a record is not a static process (no pun intended) it is a dynamic one with the stylus wiggling all over the place subjecting the vinyl to variations in pressure I certainly have no way of determining. I was Just trying to give everyone the basic picture that the pressure is considerable, in the order of tens of thousands of pounds per square inch. The article mention 10 X 10 to the forth power. That would be 100,000 PSI. But their contact patches were much smaller.
This article was written when we were still using only spherical styli. He mentions 10 gram VTF! Obviously we have advanced consideraby since then. Our styli are tiny in comparison and undoubtedly have a much higher polish. The contact patch with our special shapes is much higher lowering the PSI the vinyl is subjected to and increasing the frequency response to as high as 100 kHz. 30,000 PSI is certainly in the ballpark.
Anyway, thanx for pulling up these articles. They are fun to read given their age and most of these concepts remain true to this day.
This article was written when we were still using only spherical styli. He mentions 10 gram VTF! Obviously we have advanced consideraby since then. Our styli are tiny in comparison and undoubtedly have a much higher polish. The contact patch with our special shapes is much higher lowering the PSI the vinyl is subjected to and increasing the frequency response to as high as 100 kHz. 30,000 PSI is certainly in the ballpark.
Anyway, thanx for pulling up these articles. They are fun to read given their age and most of these concepts remain true to this day.