Thread: Zx81
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Old 9th Mar 2020, 8:32 pm   #3
fetteler's Avatar
Join Date: Jul 2011
Location: Staffordshire Moorlands, UK.
Posts: 1,117
Default Re: Zx81

Sounds to me like hum on the video output of the ZX81. This is likely caused by hum on the power supply which in turn (given the age of these devices now) is likely to be down to the smoothing capacitors in the power supply unit.

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