Shock Waves - The Major Cause of Record Wear
The major cause of record wear/damage is "shock-wave fracturing”. A pressure wave is produced by the phono stylus (needle) as it passes through the record groove. Rapidly moving pressure waves radiate from the two areas of stylus contact on the groove wall. These pressure waves travel ahead of the stylus as it moves along the groove in the same way as a bow wave moves ahead of a boat.
When the pressure wave encounters a micro-crack, flaws in the vinyl, or other surface imperfections, the energy builds up, forming a shock wave that can exceed the cohesive forces holding the surface together. When this happens, cracks occur in the vinyl and fragments can be blown off the groove wall. This kind of damage can occur on the very first play, and will increase exponentially as a function of both the number of plays and stylus loading....more
