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It's an old Lanier recorder, called the "Vest Pocket Secretary" which was advertised by Arnold Palmer when it was new. I didn't need yet another AC/DC adapter when I purchased the recorder. In fact, I just used batteries for a number of years. Now I want to use the wall plug and discovered...
I have a mini cassette recorder that will take 3V DC input from AC adapter. My generic adapter can do either negative or positive tip polarity. The manual for the recorder doesn't specify polarity; nor does the recorder itself. So how can I determine whether I should make my adapter positive...
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