UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

fetteler · 10th Mar 2020, 10:19 pm

Thank you.
That looks very much like like hum on the video to me - i.e. there is a 50/100Hz waveform superimposed on the video output. Try powering the ZX81 from a battery...
Steve.

10th Mar 2020, 10:19 pm	#21
fetteler Octode Join Date: Jul 2011 Location: Staffordshire Moorlands, UK. Posts: 1,474	Re: Zx81 Thank you. That looks very much like like hum on the video to me - i.e. there is a 50/100Hz waveform superimposed on the video output. Try powering the ZX81 from a battery... Steve. __________________ Those who lack imagination cannot imagine what is lacking...