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Old 17th Nov 2017, 8:04 pm   #8
TonyDuell
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Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 5,188
Default Re: AKAI GXC-46D Cassette recorder/player

Again according to that circuit diagram (I don't have an actual machine) there is a muting switch which shorts the audio signals to ground except in record and play modes. So the hum might be there all the time, but only audible when the muting switch opens.
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