I wish I could remember where I read this, but I remember being surprised about the amount of tracking force used on some nice cartridges and then ran across a site that suggested that a cartridge with a heavy tracking force that did not skip around in the grooves of a record did less damage then a cartridge with a light tracking force that occasionally skipped. I think the fit of the needle to the groove is probably more important in preserveing records than a light tracking force.
I think we have to remember that wear results in the long term as more of a permanent deformation of the groove (from pressure and heat), rather than the groove being slowly ripped away. I'm sure most of you know this (way more than I), but some may not.
As I understand it, the frequency of immediately repeated plays has more to do with accelerating wear than the total number of plays a disc receives in its lifetime. Because when you play a disc, the small area that comes in to contact with the stylus goes through a tremendous heat build up. The groove shaped is slightly deformed; more accurately depressed, from the sudden buildup of heat and pressure. I understand that it hits the range of 300 degrees Fahrenheit (the experts need to ensure that I'm correct here). But as the disc cools, the groove will revert to its original shape. But if you play the record a second time, RIGHT AWAY, the groove hasn't sufficiently cooled and returned to its original shape. So now, the groove deformations are compounded and made more permanent.
I suppose you could compare it to poking your forearm once with your finger bluntly. It will make an impression on the skin, but the redness will soon disappear and the impression goes away. But if you take your finger and poke your arm repeatedly on the same spot, I'm sure that it will eventually bruise a bit, or become red for a long time.
I read a hi-fi book back in 1979. I think the late Len Feldman from Audio Magazine contributed to it. (I really miss both him and that magazine). It stated that at a VTF setting of 2 grams, the wear on a record played twice in a row is roughly equal to the wear on a disc played 50 times, with each playing spaced 16 hours apart. That seems considerable. I do wonder if the amount of wear decreases much at 1.5 grams under the same circumstances.
Just some food for thought. If someone can point out any inaccuracies as to what I wrote, please chime in.
