Jeff, Pioneer quit using them in the early 90's. I've had atleast one player, CLD-52, that had one. I think that only dual-side players had them. The first player I got in the 80's, the single-side LD-838D didn't use one. My first dual-side player was the CLD-52 and it of course does. So, the answer to your query is, not applicable. Best wishes!