How do I demagnetize an audio tape player?
Is the hum from playing the tape, or does it exhibit when you press Play even without a tape in the deck? If it’s anytime you select Play, then the deck has a defect that needs repair. Otherwise, the problem is more likely already embeded on your tape and probably won’t be removable. Heads that become magnetized usually lose what fidelity they have, exhibiting less frequency response in both high and low end. Also it somewhat distorts the audio. So, an actual hum makes me wonder if the problem is elsewhere. But for your question, there really is not a home remedy for demagnetizing your audio heads. A head demagnetizer consists of many [insulated] windings around a long stick so you can insert it into the cassette opening. AC power applied to the windings causes it to act as kind of a transformer. The field created by the transformer action attracts stray magnetism deposited on the audio heads by the tape passing across them. In that way, you can remove the demagnetizer, carrying the st
