Here's what George Blood, the IA digitization expert, said: "LPs are soft and played with a very small diamond. 78s are made from shellac which is hard and abr

Here's what George Blood, the IA digitization expert, said: "LPs are soft and played with a very small diamond. 78s are made from shellac which is hard and abrasive. Originally they were played with steel needles at 10x the tracking weight used by our modern equipment. They also use a much larger diamond with 5-10x the surface area. The tracking force is spread over a larger area than vinyl playback. The contact pressure is less than 10% of vinyl playback. "