Don't know if this fits, but I got my Timex Sinclair 1000 working.

I bought this Timex Sinclair 1000 at a thrift store last year. I bought a new membrane keyboard to replace the old one. I finally got it working tonight. It requires a special RF-to-VHF adapter box, and I'm using an old black-and-white television with a VHF knob. The trick to getting it on is to fiddle with a little switch on the box.

I was lucky enough to find this computer in its box with a manual, I've been able to type out some BASIC programs on it, seems to be a fun little machine.