At your risk. Take all safety precautions.
The petticular ZX spectrum used has the hardware hack of taking composite out just before the RF transistor inside the screen small box.
Composite out was connected to pins Sync and Lum (luminance).
Thanks to Bryce:
http://www.cpcwiki.eu/forum/amstrad-cpc-hardware/connecting-another-computer-to-a-gt65-cpc-monochrome-monitor/
By looking the male DIN coming from the monitor these are bottom right and central pin respectively. Upper right is ground ie ground pin connected to ZX spectrum ground.
It worked. But for some reason picture is shifted to the left a bit. So the leftmost parts of what Spectrum produces cannot be seen.
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