Thanks Bunsen and CC_333.

I've swapped the video board over, and it's the same on screen, so it's not that bit.

I've replaced the solder around the flyback, and reflowed the joints around the variable pots. I didn't want to overheat anything else, as I think it's heat that killed the semiconductors on the last board.

It's better, but I am still seeing some ghosting. This leads me to agree with you CC_333; I believe it's the board.

Apart from that, the screen's great - excellent geometry, and good focus.

That search recommendation is excellent by the way - lots of information about all sorts of interesting things.

Thanks again!