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Audio tapes do not need "baking" or any other special treatment unless they used a particular hydroscopic polyurethane in their binder formulations. A good portion of Ampex and Agfa production suffered from this instability, and some 3M production also used the same binder. BASF, Maxell, and TDK tapes do not suffer from the same problem and should never be "baked" prior to playing them.
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