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They use a special needle that cuts (burns?) the groove, they use a special disc to record on. Good blank discs can be hard to come by, I've seen some where the coating will crack. (they are a metal disk covered with some sort of shellac or whatever) I've also heard that the crystal stylus can be trouble. They can be made to work though. Got a pile of portable Recordios/Recordettes and their competitors. Never tried to record anything with one. I do have some old recordings. The ones I have don't sound like much but I guess they were better than nothing. A bunch of radio/phonos from the 40s offered disc recording options. There, told you more than I know!
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Bryan
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