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The ZX81 Composite video PCB replaces the RF modulator in the ZX81 which will give you a clearer and more stable picture on modern TV's. Do not attempt this if you are not comfortable soldering. You risk damaging the ZX81 if you are not proficient in soldering.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.