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Thanks for the advice guys.
I also thought it might be something to do with noise coming from the display. So I removed it completely. In fact I took the main board out disconnected from everything except the power supply. By wiring an external amp into the audio circuit I could still hear the...
I have drawn a blank on the specialist Commodore forums and I expect this is more of a general electronics issue anyway so hoping someone here could shed some light.
I have an old (c.1984) Commodore SX64 which has interference on the audio circuit - strange thing is if you drive the audio by...
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