https://www.retrocomputershack.com/Technical-Info/Spectrum128-Blanking-Mod/spectrum128-blanking-mod001002.jpg
email contact: rcs-sales@hotmail.com
https://www.retrocomputershack.com/Technical-Info/Spectrum128-Blanking-Mod/pdf-dl.jpg
SINCLAIR SPECTRUM 128K (TOASTRACK) RGB SCART, BLANKING SIGNAL MOD