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Does anyone have any stats on the pressure and heat generated at the point of contact between the needle and the record Edisons will be a totally different value - I mean a standard Victrola.HMV reproducer)?
I remember reading years ago that the pressure/heat generated by an elliptical stylus on a vinyl record was something tremendous.
Pressure/heat Question
-
Nat
- Victor III
- Posts: 598
- Joined: Fri Aug 07, 2009 12:02 pm
- Location: Edmonds, Washington
-
Nat
- Victor III
- Posts: 598
- Joined: Fri Aug 07, 2009 12:02 pm
- Location: Edmonds, Washington
Re: Pressure/heat Question
All I've found so far:
"The stylus is the only part of the cartridge to make contact with the record. A force must be exerted by the tonearm to keep the stylus in the groove while the record is spinning. This tracking force is low, usually between three and four grams. But because the stylus has a “footprint” of less than one millionth of a square inch of the record face, it exerts a tremendous pressure: 6,000 pounds per square inch. At such enormous pressure, any roughness or irregularity in the stylus would cause record damage. The stylus must also be very hard or it will wear out quickly. For these reasons, quality styli are precision made from the finest and hardest material known: pure diamond. Spherical stylus is for heavy back-cueing and scratching. Stays in the groove. Elliptical stylus is for lighter back-cueing and scratching. Best sound performance." (http://www.ortofon-dj.com/faq)
The pressure from a standard Vic reproducer must be huge, although the point of contact with a round needle in a 78 rpm groove will disperse the pressure over a wider area (assuming a sharp needle).
"The stylus is the only part of the cartridge to make contact with the record. A force must be exerted by the tonearm to keep the stylus in the groove while the record is spinning. This tracking force is low, usually between three and four grams. But because the stylus has a “footprint” of less than one millionth of a square inch of the record face, it exerts a tremendous pressure: 6,000 pounds per square inch. At such enormous pressure, any roughness or irregularity in the stylus would cause record damage. The stylus must also be very hard or it will wear out quickly. For these reasons, quality styli are precision made from the finest and hardest material known: pure diamond. Spherical stylus is for heavy back-cueing and scratching. Stays in the groove. Elliptical stylus is for lighter back-cueing and scratching. Best sound performance." (http://www.ortofon-dj.com/faq)
The pressure from a standard Vic reproducer must be huge, although the point of contact with a round needle in a 78 rpm groove will disperse the pressure over a wider area (assuming a sharp needle).