[murphyv310]

Hi Graham.
Yes I think that's what the problem could be, I think also there is a certain amount of compression on Vidblaster, my original test card C when dragged across to the 405 line screen looks good but less so on Vidblaster, the one you've sent is a lot better indeed on Vidblaster. I have an even higher resolution test card C on a spare HDD and I'll try that later on once I find it.
Now have a fair size library with lots of films recorded from Talking Pictures and YouTube, also DVDs converted to MP4, Dr Who, Steptoe etc, much easier than with a standards converter.