Hi ranks. Welcome to AAC!
Every time you turn on your TV, the internal coil powers up. All you really have to do is just turn your TV on and off repeatedly. It should get rid of most of the problem.
20-30 minutes? I'm thinking 20-30 seconds is enough, if you turn it on and turn it off immediately. I did it to my own television set before and half a minute was plenty.The TV will need to be turned off for 20-30 minutes between degauss shots to allow the thermistor that turns off the degauss coil after a few seconds to cool sufficiently, else repeated cycling of the power will not provide a strong degauss shot.
Yes. However, you should know that the demagnetizing effect is due to the DECREASING magnetic AC field. This is one reason why they use a PTC in series with the coil. If you want the same effect without a thermistor you will need to move the coil slowly away from the object to be demagnetitized.
20-30 minutes? I'm thinking 20-30 seconds is enough, if you turn it on and turn it off immediately. I did it to my own television set before and half a minute was plenty.
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