[Paul Stenning]

If this is your first restoration of anything with valves in, I would suggest that you might want to think about starting off with a couple of 1950s AM-only radios (metal chassis, not PCB), then maybe an FM radio or two, before venturing to a TV set. A radio has a lot of the same potential problem areas with a lot less parts, but without the line output and CRT etc to deal with. Once you have a better feel for what you are doing you should be able to have a go at the TV12, with assistance from people here.

Just my £0.02 worth!