Cause of 'flickering' on Philco Predicta

[john116]

Hi - have finally got my Predicta in mostly working condition, with a reasonably good picture. However, it has a flickering/shimmering effect that I'm struggling to work out what is causing it.

I should say, I'm using the set in Australia, 240 volts 50hz converted to 110 volts, 50 hz instead of 60hz. Am feeding it a 525 line signal from a DVD player, and using an American RF channel 3 modulator. I have other American sets that work on 50hz with no problem, so assume that's not the issue on the Predicta.

I have a short video here, showing the problem: http://60.240.221.94/stk/predicta1.mp4

The effect is not caused by filming the screen, that's also what it looks like in real life.

Any suggestions would be much appreciated.


John