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For about 2 days last week I became very worried, as my computer kept telling me this place didn't exist anymore. Now I am very relieved to find out it was only due to this server change. Anyway, during that time I was looking for other old TV forums, as I can't stop reading these. On one of these, I found an interesting modification to be made to one of these early Motorolas to remove retrace lines. It works like this: take C139 (which goes from pin 5 of the vert. out tube to ground, and connect a 220K resistor inbetween the cap. and ground. Then take the wire going from the first grid of the 7JP4 to ground and instead connect it between that cap. and the 220K resistor. It was claimed that this would not only take out the retrace lines on normal tv channels, but also take out those ones you get when watching one of those awful DVDs with the junk in the first few lines of the picture. I tried it and it works. I thought people here might benefit from this as well. Does anybody here understand exactly how this works? Is it something limited to this set, or to electrostatic sets? Could a similar modification be made to later model electromagnetic tube sets or mabye even tube color sets? I would really like to be able to watch these DVDs without the retrace lines on an old tube color set.
Last edited by Adam; 09-13-2009 at 10:38 AM.
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