Description
This Rudedog designed PCB inspired by a schematic at zigg.net will allow you to replace the insides of a ZX-81 RF modulator with a new PCB that will give your ZX-81 a much better, stable picture on modern televisions.
This item is for the pre-built and tested version of the PCB. You will need some soldering skills to remove the old RF modulator from the ZX-81 PCB, remove the insides of the RF modulator and replace them with this PCB. You will then have to resolder the RF modulator back into your ZX-81.
Moderate soldering skills are required, but full instructions are provided.
Please note: For ZX81’s with newer ULA’s that produce the backporch signal, or those with a replacement ULA like the excellent VLA81, our board can enable or disable that feature with a simple jumper.
If you prefer to have it done by us, and have your ZX-81 refurbished at the same time, see this item in our shop instead: Sinclair ZX-81 Refurbish and Video Upgrade
John J (store manager) –
Job done a beautifully clear picture. Magic