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Old 11th March 2010
  #6
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OK now de-magnetizing!!!!!!!!

some time ago I found on DIY forum THANK you 1954U1

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quickly done the de-magnetizing procedure suggested:
sine wave at 30 Hz, 30 secs sweep 0V-3V [point of saturation], 30 secs sweep 3V-0V.

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so now 28 input transformers to de-magnetize :o