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SiriusHardware · 23rd Mar 2020, 7:38 pm

OK, it will be interesting to see if your ULA still breaks down when it is no longer driving the buffer transistor. If it keeps on going indefinitely with no change - don't forget, you may need to tweak the tuning on the TV every now and then as the modulator frequency drifts - then I would say have a go at fitting the CCU PCB.

23rd Mar 2020, 7:38 pm	#152
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,548	Re: Zx81 OK, it will be interesting to see if your ULA still breaks down when it is no longer driving the buffer transistor. If it keeps on going indefinitely with no change - don't forget, you may need to tweak the tuning on the TV every now and then as the modulator frequency drifts - then I would say have a go at fitting the CCU PCB.