Hello r/vic20! I rescued this beauty today and spent the evening cleaning it up. It came with the RF box and an RCA cable, and after some fiddling, I realized I needed to connect the box to another RF connector, so I used an old Sega Genesis one and was able to get video, so I know she works. I'd love to find a plug and play Composite cable, though. Some brief googling tells me that I need to be careful.

I ordered this because I'm impatient and it was cheap

https://www.amazon.com/gp/product/B00M0FXR8A/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

Will this work?